svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.dal / org.gvsig.fmap.dal.impl / src / main / java / org / gvsig / fmap / dal / feature / paging / impl / FeaturePagingHelperImpl.java @ 42775
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/**
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* gvSIG. Desktop Geographic Information System.
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*
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* Copyright (C) 2007-2013 gvSIG Association.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 3
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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* For any additional information, do not hesitate to contact us
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* at info AT gvsig.com, or visit our website www.gvsig.com.
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*/
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package org.gvsig.fmap.dal.feature.paging.impl; |
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import java.util.Collection; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.ListIterator; |
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import org.slf4j.Logger; |
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import org.slf4j.LoggerFactory; |
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import org.gvsig.fmap.dal.exception.DataException; |
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import org.gvsig.fmap.dal.feature.EditableFeature; |
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import org.gvsig.fmap.dal.feature.Feature; |
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import org.gvsig.fmap.dal.feature.FeatureQuery; |
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import org.gvsig.fmap.dal.feature.FeatureSelection; |
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import org.gvsig.fmap.dal.feature.FeatureSet; |
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import org.gvsig.fmap.dal.feature.FeatureStore; |
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import org.gvsig.fmap.dal.feature.FeatureType; |
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import org.gvsig.fmap.dal.feature.exception.ConcurrentDataModificationException; |
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import org.gvsig.fmap.dal.feature.exception.FeatureIndexException; |
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import org.gvsig.fmap.dal.feature.impl.dynobjectutils.DynObjectFeatureFacade; |
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import org.gvsig.fmap.dal.feature.paging.FacadeOfAFeaturePagingHelper; |
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import org.gvsig.fmap.dal.feature.paging.FeaturePagingHelper; |
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import org.gvsig.tools.dynobject.DynObject; |
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import org.gvsig.tools.dynobject.DynObjectSet; |
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import org.gvsig.tools.dynobject.impl.DefaultDynObjectPagingHelper; |
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import org.gvsig.tools.exception.BaseException; |
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import org.gvsig.tools.visitor.VisitCanceledException; |
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import org.gvsig.tools.visitor.Visitor; |
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/**
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* Helper class to access the values of a FeatureCollection by position. Handles
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* pagination automatically to avoid filling the memory in case of big
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* collections.
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*
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* TODO: evaluate if its more convenient to read values in the background when
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* the returned value is near the end of the page, instead of loading a page on
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* demand.
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*
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* @author gvSIG Team
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*/
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public class FeaturePagingHelperImpl extends DefaultDynObjectPagingHelper |
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implements FeaturePagingHelper {
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private static final Logger LOG = LoggerFactory |
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.getLogger(FeaturePagingHelperImpl.class); |
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private FeatureQuery query;
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private FeatureStore featureStore;
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/** If the selected Features must be returned as the first ones. **/
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private boolean selectionUp = false; |
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private FeatureSet featSet = null; |
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private FeatureSelection initialSelection = null; |
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private Feature[] features = null; |
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private boolean initialization_completed = false; |
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/**
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* Constructs a FeaturePagingHelperImpl from data of a FeatureStore.
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*
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* @param featureStore
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* to extract data from
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* @throws DataException
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* if there is an error initializing the helper
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*/
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public FeaturePagingHelperImpl(FeatureStore featureStore)
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throws BaseException {
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this(featureStore, DEFAULT_PAGE_SIZE);
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} |
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/**
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* Constructs a FeaturePagingHelperImpl from data of a FeatureStore.
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*
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* @param featureStore
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* to extract data from
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* @param pageSize
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* the number of elements per page data
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* @throws DataException
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* if there is an error initializing the helper
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*/
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public FeaturePagingHelperImpl(FeatureStore featureStore, int pageSize) |
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throws BaseException {
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this(featureStore, null, pageSize); |
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} |
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/**
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* Constructs a FeaturePagingHelperImpl from data of a FeatureStore.
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*
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* @param featureStore
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* to extract data from
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* @throws DataException
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* if there is an error initializing the helper
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*/
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public FeaturePagingHelperImpl(FeatureStore featureStore,
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FeatureQuery featureQuery) throws BaseException {
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this(featureStore, featureQuery, DEFAULT_PAGE_SIZE);
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} |
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/**
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* Constructs a FeaturePagingHelperImpl from data of a FeatureStore.
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*
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* @param featureSet
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* to extract data from
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* @param pageSize
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* the number of elements per page data
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* @throws DataException
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* if there is an error initializing the helper
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*/
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public FeaturePagingHelperImpl(FeatureStore featureStore,
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FeatureQuery featureQuery, int pageSize) throws BaseException { |
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super();
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FeatureQuery query = featureQuery; |
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if (featureQuery == null) { |
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query = featureStore.createFeatureQuery(); |
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query.setFeatureType(featureStore.getDefaultFeatureType()); |
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} |
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this.featureStore = featureStore;
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this.query = query;
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this.query.setPageSize(pageSize);
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setDefaultCalculator(new Sizeable() {
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public long getSize() { |
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FeatureSet featureSet = getFeatureSet(false);
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try {
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return featureSet.getSize();
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} catch (BaseException e) {
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LOG.error("Error getting the size of the FeatureSet: "
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+ featureSet, e); |
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return 0l; |
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} |
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} |
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}, pageSize); |
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if (LOG.isDebugEnabled()) {
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LOG.debug("FeaturePagingHelperImpl created with {} pages, "
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+ "and a page size of {}", new Long(getCalculator() |
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.getNumPages()), new Integer(pageSize)); |
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} |
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this.initialization_completed = true; |
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} |
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/**
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* @return the selectionUp status
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*/
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public boolean isSelectionUp() { |
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return selectionUp;
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} |
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public void setSelectionUp(boolean selectionUp) { |
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this.selectionUp = selectionUp;
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try {
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FeatureSelection currentSelection = getFeatureStore().getFeatureSelection(); |
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if (selectionUp && !currentSelection.isEmpty()) {
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initialSelection =(FeatureSelection) currentSelection.clone(); |
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setCalculator(new OneSubsetOneSetPagingCalculator(
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new FeatureSetSizeableDelegate(initialSelection),
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new FeatureSetSizeableDelegate(getFeatureSet(false)), |
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getMaxPageSize())); |
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} else {
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if (initialSelection != null) { |
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initialSelection.dispose(); |
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initialSelection = null;
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} |
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setDefaultCalculator(new FeatureSetSizeableDelegate(
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getFeatureSet(false)), getMaxPageSize());
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} |
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} catch (BaseException e) {
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LOG.error("Error setting the selection up setting to: "
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+ selectionUp, e); |
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} catch (CloneNotSupportedException e) { |
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LOG.error("Error cloning the selection "
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+ "while setting the selection up", e);
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} |
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} |
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public Feature getFeatureAt(long index) throws BaseException { |
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// Check if we have currently loaded the viewed page data,
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// or we need to load a new one
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long pageForIndex = (long) Math.floor(index / getMaxPageSize()); |
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if (pageForIndex != getCurrentPage()) {
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setCurrentPage(pageForIndex); |
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} |
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long positionForIndex = index - (getCurrentPage() * getMaxPageSize());
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if (positionForIndex >= getCurrentPageFeatures().length) {
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throw new FeatureIndexException( |
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new IndexOutOfBoundsException("positionForIndex too big: " |
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+ positionForIndex)); |
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} else {
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Feature feature = getCurrentPageFeatures()[(int) positionForIndex];
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return feature;
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} |
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} |
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public Feature[] getCurrentPageFeatures() { |
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if( this.features==null ) { |
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try {
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this.loadCurrentPageData();
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} catch (BaseException ex) {
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// Do nothing
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} |
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if( this.features == null ) { |
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String msg = "Can't retrieve the features from current page."; |
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LOG.warn(msg); |
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throw new RuntimeException(msg); |
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} |
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} |
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return features;
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} |
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/**
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* Gets the feature set.
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* The boolean tells whether we must create the featureset
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* again (for example perhaps we need it after a feature
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* has been added/removed)
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*/
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private FeatureSet getFeatureSet(boolean reset) { |
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if (featSet == null || reset) { |
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if (featSet != null) { |
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try {
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featSet.dispose(); |
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} catch (Exception ex) { |
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LOG.info("Error while disposing featset.", ex);
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} |
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} |
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try {
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FeatureStore featureStore = getFeatureStore(); |
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synchronized (featureStore) {
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featSet = featureStore.getFeatureSet(getFeatureQuery()); |
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} |
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} catch (DataException e) {
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throw new RuntimeException("Error getting a feature set with the query " + getFeatureQuery()); |
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} |
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} |
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return featSet;
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} |
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public DynObjectSet getDynObjectSet() {
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return getFeatureSet(false).getDynObjectSet(); |
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} |
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public void reloadCurrentPage() throws BaseException { |
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boolean sel_up = this.isSelectionUp(); |
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setSelectionUp(false);
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if (getCalculator().getCurrentPage() > -1) { |
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loadCurrentPageData(); |
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} |
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if (sel_up) {
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setSelectionUp(true);
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} |
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} |
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public void reload() throws BaseException { |
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/*
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* Force re-creation of feature set
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*/
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this.getFeatureSet(true); |
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setDefaultCalculator(new Sizeable() {
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public long getSize() { |
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FeatureSet featureSet = getFeatureSet(false);
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try {
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return featureSet.getSize();
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} catch (BaseException e) {
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LOG.error("Error getting the size of the FeatureSet: "
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+ featureSet, e); |
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return 0l; |
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} |
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} |
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}, getCalculator().getMaxPageSize()); |
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reloadCurrentPage(); |
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} |
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public FeatureStore getFeatureStore() {
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return featureStore;
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} |
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public FeatureQuery getFeatureQuery() {
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return query;
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} |
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/**
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* Loads all the Features of the current page.
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*/
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protected void loadCurrentPageData() throws BaseException { |
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if( !initialization_completed ) {
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return;
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} |
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final int currentPageSize = getCalculator().getCurrentPageSize(); |
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final Feature[] values = new Feature[currentPageSize]; |
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long t1 = 0; |
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if (LOG.isTraceEnabled()) {
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t1 = System.currentTimeMillis();
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} |
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if (selectionUp) {
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loadCurrentPageDataWithSelectionUp(values); |
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} else {
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loadCurrentPageDataNoSelection(values); |
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} |
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if (LOG.isTraceEnabled()) {
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long t2 = System.currentTimeMillis(); |
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LOG.trace("Time to load {} features: {} ms", new Integer( |
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currentPageSize), new Long(t2 - t1)); |
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} |
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this.features = values;
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} |
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private void loadCurrentPageDataWithSelectionUp(final Feature[] values) |
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throws BaseException {
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FeatureSelection selection = initialSelection; |
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if (selection == null) { |
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loadCurrentPageDataNoSelection(values); |
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} else {
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FeatureSet set = getFeatureSet(false);
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try {
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OneSubsetOneSetPagingCalculator twoSetsCalculator = null;
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if (getCalculator() instanceof OneSubsetOneSetPagingCalculator) { |
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twoSetsCalculator |
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= (OneSubsetOneSetPagingCalculator) getCalculator(); |
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} else {
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twoSetsCalculator |
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= new OneSubsetOneSetPagingCalculator(
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new FeatureSetSizeableDelegate(selection),
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new FeatureSetSizeableDelegate(set),
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getMaxPageSize(), getCalculator().getCurrentPage()); |
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setCalculator(twoSetsCalculator); |
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} |
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// First load values from the selection, if the current page has
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// elements from it
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if (twoSetsCalculator.hasCurrentPageAnyValuesInFirstSet()) {
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loadDataFromFeatureSet(values, 0, selection,
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twoSetsCalculator.getFirstSetInitialIndex(), |
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twoSetsCalculator.getFirstSetHowMany(), null);
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} |
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// Next, load values from the FeatureSet if the current page has values
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// from it
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if (twoSetsCalculator.hasCurrentPageAnyValuesInSecondSet()) {
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loadDataFromFeatureSet( |
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values, |
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// The cast will work as that size will be <= maxpagesize,
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// which is an int
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(int) twoSetsCalculator.getFirstSetHowMany(), set,
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twoSetsCalculator.getSecondSetInitialIndex(), |
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twoSetsCalculator.getSecondSetHowMany(), selection); |
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} |
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} finally {
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/*
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* This is the feature set
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* we dont want to lose it
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*/
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// set.dispose();
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} |
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} |
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} |
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|
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private void loadCurrentPageDataNoSelection(final Feature[] values) |
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throws BaseException {
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|
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long firstPosition = getCalculator().getInitialIndex();
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|
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if (LOG.isDebugEnabled()) {
|
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LOG.debug("Loading {} Features starting at position {}",
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new Integer(getCalculator().getCurrentPageSize()), new Long( |
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firstPosition)); |
409 |
} |
410 |
|
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FeatureSet featureSet = getFeatureSet(false);
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try {
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loadDataFromFeatureSet(values, 0, featureSet, firstPosition,
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getCalculator().getCurrentPageSize(), null);
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} catch(DataException ex) {
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throw ex;
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// } finally {
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// featureSet.dispose();
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} |
420 |
|
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} |
422 |
|
423 |
private void loadDataFromFeatureSet(final Feature[] values, |
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final int valuesPosition, FeatureSet set, long initialIndex, |
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final long howMany, final FeatureSelection selectedFeaturesToSkip) |
426 |
throws DataException {
|
427 |
|
428 |
try {
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429 |
set.accept(new Visitor() {
|
430 |
|
431 |
private int i = valuesPosition; |
432 |
|
433 |
public void visit(Object obj) throws VisitCanceledException, |
434 |
BaseException { |
435 |
if (i >= valuesPosition + howMany) {
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throw new VisitCanceledException(); |
437 |
} |
438 |
Feature current = (Feature) obj; |
439 |
// Add the current Feature only if we don't skip selected
|
440 |
// features or the feature is not selected
|
441 |
if (selectedFeaturesToSkip == null |
442 |
|| !selectedFeaturesToSkip.isSelected(current)) { |
443 |
try {
|
444 |
values[i] = current.getCopy(); |
445 |
i++; |
446 |
} catch(Exception ex) { |
447 |
// Aqui no deberia petar, pero...
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448 |
// me he encontrado un caso que tenia una referencia a
|
449 |
// una feature seleccionada que ya no existia. No se como
|
450 |
// habia pasado, se habia quedado de antes guardada en el
|
451 |
// proyecto pero la feature ya no existia, y eso hacia que
|
452 |
// petase al intentar leer de disco la feature a partir
|
453 |
// de una referencia no valida.
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454 |
} |
455 |
} |
456 |
} |
457 |
}, initialIndex); |
458 |
} catch (BaseException e) {
|
459 |
if (e instanceof DataException) { |
460 |
throw ((DataException) e);
|
461 |
} else {
|
462 |
LOG.error("Error loading the data starting at position {}",
|
463 |
new Long(initialIndex), e); |
464 |
} |
465 |
} |
466 |
} |
467 |
|
468 |
public void delete(Feature feature) throws BaseException { |
469 |
featureStore.delete(feature); |
470 |
/*
|
471 |
* Force re-creation of feature set
|
472 |
*/
|
473 |
this.getFeatureSet(true); |
474 |
|
475 |
reloadCurrentPage(); |
476 |
} |
477 |
|
478 |
public void insert(EditableFeature feature) throws BaseException { |
479 |
featureStore.insert(feature); |
480 |
/*
|
481 |
* Force re-creation of feature set
|
482 |
*/
|
483 |
this.getFeatureSet(true); |
484 |
|
485 |
reloadCurrentPage(); |
486 |
} |
487 |
|
488 |
public void update(EditableFeature feature) throws BaseException { |
489 |
featureStore.update(feature); |
490 |
/*
|
491 |
* Force re-creation of feature set
|
492 |
*/
|
493 |
this.getFeatureSet(true); |
494 |
|
495 |
reloadCurrentPage(); |
496 |
} |
497 |
|
498 |
public FeatureType getFeatureType() {
|
499 |
|
500 |
FeatureType ft = null;
|
501 |
|
502 |
try {
|
503 |
ft = featureStore.getDefaultFeatureType(); |
504 |
} catch (DataException e) {
|
505 |
LOG.error("Error while getting feature type: " +
|
506 |
e.getMessage(), e); |
507 |
} |
508 |
return ft;
|
509 |
|
510 |
/*
|
511 |
*
|
512 |
FeatureSet featureSet = getFeatureSet();
|
513 |
try {
|
514 |
return featureSet.getDefaultFeatureType();
|
515 |
} finally {
|
516 |
featureSet.dispose();
|
517 |
}
|
518 |
*/
|
519 |
|
520 |
|
521 |
} |
522 |
|
523 |
protected void doDispose() throws BaseException { |
524 |
initialSelection.dispose(); |
525 |
if (featSet != null) { |
526 |
try {
|
527 |
featSet.dispose(); |
528 |
} catch (Exception ex) { |
529 |
LOG.info("Error while disposing featset.", ex);
|
530 |
} |
531 |
} |
532 |
} |
533 |
|
534 |
public DynObject[] getCurrentPageDynObjects() { |
535 |
Feature[] features = getCurrentPageFeatures();
|
536 |
DynObject[] dynobjects = new DynObject[features.length]; |
537 |
for (int i = 0; i < dynobjects.length; i++) { |
538 |
dynobjects[i] = new DynObjectFeatureFacade(features[i]);
|
539 |
} |
540 |
return dynobjects;
|
541 |
} |
542 |
|
543 |
public DynObject getDynObjectAt(long index) throws BaseException { |
544 |
return new DynObjectFeatureFacade(getFeatureAt(index)); |
545 |
} |
546 |
|
547 |
public List asList() { |
548 |
return new FeaturePagingHelperList(); |
549 |
} |
550 |
|
551 |
public List asListOfDynObjects() { |
552 |
return new DynObjectPagingHelperList(); |
553 |
} |
554 |
|
555 |
private class FeaturePagingHelperList extends PagingHelperList { |
556 |
public Object get(int i) { |
557 |
try {
|
558 |
return getFeatureAt(i);
|
559 |
} catch (BaseException ex) {
|
560 |
throw new RuntimeException(ex); |
561 |
} |
562 |
} |
563 |
} |
564 |
|
565 |
private class DynObjectPagingHelperList extends PagingHelperList { |
566 |
public Object get(int i) { |
567 |
try {
|
568 |
return getDynObjectAt(i);
|
569 |
} catch (BaseException ex) {
|
570 |
throw new RuntimeException(ex); |
571 |
} |
572 |
} |
573 |
|
574 |
} |
575 |
|
576 |
private abstract class PagingHelperList implements List, FacadeOfAFeaturePagingHelper { |
577 |
|
578 |
@Override
|
579 |
public FeaturePagingHelper getFeaturePagingHelper() {
|
580 |
return FeaturePagingHelperImpl.this;
|
581 |
} |
582 |
|
583 |
public int size() { |
584 |
try {
|
585 |
return (int) getFeatureSet(false).getSize(); |
586 |
} catch (DataException ex) {
|
587 |
throw new RuntimeException(ex); |
588 |
} |
589 |
} |
590 |
|
591 |
public boolean isEmpty() { |
592 |
try {
|
593 |
return getFeatureSet(false).isEmpty(); |
594 |
} catch (DataException ex) {
|
595 |
throw new RuntimeException(ex); |
596 |
} catch (ConcurrentDataModificationException ex) {
|
597 |
LOG.warn( |
598 |
"Error to asking about the emptiness of the store. Retrying reloading data.",
|
599 |
ex); |
600 |
try {
|
601 |
reload(); |
602 |
} catch (BaseException e) {
|
603 |
LOG.warn("Error reloading data.", e);
|
604 |
throw new RuntimeException(e); |
605 |
} |
606 |
try {
|
607 |
return getFeatureSet(false).isEmpty(); |
608 |
} catch (DataException e) {
|
609 |
LOG.warn( |
610 |
"Error to asking about the emptiness of the store after reloading data.",
|
611 |
e); |
612 |
throw new RuntimeException(e); |
613 |
} |
614 |
} |
615 |
} |
616 |
|
617 |
public Iterator iterator() { |
618 |
try {
|
619 |
return getFeatureSet(false).fastIterator(); |
620 |
} catch (DataException ex) {
|
621 |
throw new RuntimeException(ex); |
622 |
} |
623 |
} |
624 |
|
625 |
public boolean contains(Object o) { |
626 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
627 |
} |
628 |
|
629 |
public Object[] toArray() { |
630 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
631 |
} |
632 |
|
633 |
public Object[] toArray(Object[] ts) { |
634 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
635 |
} |
636 |
|
637 |
public boolean add(Object e) { |
638 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
639 |
} |
640 |
|
641 |
public boolean remove(Object o) { |
642 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
643 |
} |
644 |
|
645 |
public boolean containsAll(Collection clctn) { |
646 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
647 |
} |
648 |
|
649 |
public boolean addAll(Collection clctn) { |
650 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
651 |
} |
652 |
|
653 |
public boolean addAll(int i, Collection clctn) { |
654 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
655 |
} |
656 |
|
657 |
public boolean removeAll(Collection clctn) { |
658 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
659 |
} |
660 |
|
661 |
public boolean retainAll(Collection clctn) { |
662 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
663 |
} |
664 |
|
665 |
public void clear() { |
666 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
667 |
} |
668 |
|
669 |
public Object set(int i, Object e) { |
670 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
671 |
} |
672 |
|
673 |
public void add(int i, Object e) { |
674 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
675 |
} |
676 |
|
677 |
public Object remove(int i) { |
678 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
679 |
} |
680 |
|
681 |
public int indexOf(Object o) { |
682 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
683 |
} |
684 |
|
685 |
public int lastIndexOf(Object o) { |
686 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
687 |
} |
688 |
|
689 |
public ListIterator listIterator() { |
690 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
691 |
} |
692 |
|
693 |
public ListIterator listIterator(int i) { |
694 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
695 |
} |
696 |
|
697 |
public List subList(int i, int i1) { |
698 |
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
699 |
} |
700 |
|
701 |
} |
702 |
} |