svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.dal / org.gvsig.fmap.dal.api / src / main / java / org / gvsig / fmap / dal / feature / FeatureQueryOrder.java @ 44644
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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 modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation; either version 3 of the License, or (at your option) any later
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* version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* For any additional information, do not hesitate to contact us at info AT
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* gvsig.com, or visit our website www.gvsig.com.
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*/
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package org.gvsig.fmap.dal.feature; |
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import java.util.ArrayList; |
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import java.util.Collections; |
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import java.util.Comparator; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.NoSuchElementException; |
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import org.apache.commons.lang3.StringUtils; |
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import org.gvsig.fmap.dal.exception.DataEvaluatorRuntimeException; |
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import org.gvsig.tools.evaluator.Evaluator; |
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import org.gvsig.tools.evaluator.EvaluatorData; |
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import org.gvsig.tools.evaluator.EvaluatorException; |
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import org.gvsig.tools.lang.Cloneable; |
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import org.gvsig.tools.persistence.Persistent; |
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import org.gvsig.tools.persistence.PersistentState; |
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import org.gvsig.tools.persistence.exception.PersistenceException; |
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public class FeatureQueryOrder implements Persistent, Cloneable { |
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public class FeatureQueryOrderMember implements Persistent, org.gvsig.tools.lang.Cloneable { |
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String attributeName = null; |
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Evaluator evaluator = null;
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boolean ascending;
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FeatureQueryOrderMember(String attributeName, boolean ascending) { |
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this.attributeName = attributeName;
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this.ascending = ascending;
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} |
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FeatureQueryOrderMember(Evaluator evaluator, boolean ascending) {
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this.evaluator = evaluator;
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this.ascending = ascending;
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} |
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public boolean hasEvaluator() { |
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return this.evaluator != null; |
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} |
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public Evaluator getEvaluator() {
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return this.evaluator; |
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} |
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public boolean getAscending() { |
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return this.ascending; |
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} |
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public String getAttributeName() { |
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return this.attributeName; |
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} |
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@Override
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public void loadFromState(PersistentState state) |
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throws PersistenceException {
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this.attributeName = state.getString("attributeName"); |
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this.ascending = state.getBoolean("ascending"); |
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this.evaluator = (Evaluator) state.get("evaluator"); |
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} |
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@Override
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public void saveToState(PersistentState state) |
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throws PersistenceException {
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state.set("attributeName", this.attributeName); |
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state.set("ascending", this.ascending); |
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if (this.evaluator != null) { |
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state.set("evaluator", evaluator);
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} |
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} |
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@Override
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public FeatureQueryOrderMember clone() throws CloneNotSupportedException { |
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// Nothing more to clone
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return (FeatureQueryOrderMember) super.clone(); |
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} |
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public void setAscending(boolean ascending) { |
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this.ascending = ascending;
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} |
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} |
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private List<FeatureQueryOrderMember> members = new ArrayList(); |
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public FeatureQueryOrder() {
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} |
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@Override
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public String toString() { |
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StringBuilder builder = new StringBuilder(); |
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boolean needComma = false; |
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for (FeatureQueryOrderMember member : members) {
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if( member!=null && !StringUtils.isBlank(member.getAttributeName()) ) { |
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if( needComma ) {
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builder.append(",");
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} |
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if( member.ascending ) {
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builder.append("+");
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} else {
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builder.append("-");
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} |
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builder.append(member.getAttributeName()); |
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needComma = true;
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} |
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} |
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String s = builder.toString();
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if( StringUtils.isBlank(s) ) {
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return null; |
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} |
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return s;
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} |
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public Object add(String order) { |
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if( StringUtils.isEmpty(order) ) {
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return null; |
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} |
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Object r = null; |
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String[] attributes = StringUtils.split(order, ','); |
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for (String attribute : attributes) { |
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boolean ascending = true; |
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if( attribute.startsWith("+") ) { |
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ascending = true;
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attribute = attribute.substring(1);
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} else if( attribute.startsWith("-") ) { |
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ascending = false;
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attribute = attribute.substring(1);
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} |
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attribute = attribute.trim(); |
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r = this.add(attribute,ascending);
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} |
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return r;
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} |
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public Object add(String attributeName, boolean ascending) { |
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FeatureQueryOrderMember member = new FeatureQueryOrderMember(
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attributeName, ascending); |
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if (members.add(member)) {
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return member;
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} |
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return null; |
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} |
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public Object add(Evaluator evaluator, boolean ascending) { |
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FeatureQueryOrderMember member = new FeatureQueryOrderMember(
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evaluator, |
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ascending); |
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if (members.add(member)) {
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return member;
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} |
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return null; |
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} |
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public Iterable<FeatureQueryOrderMember> members() { |
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// Me hubiese gustado que FeatureQueryOrder fuese Iterable, pero no se deja por
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// que FeatureQueryOrderMember es una clase interna y no esta definida en el
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// momento de poner el :
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// implements Iterable<FeatureQueryOrderMember>
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// Y si saco a una clase independiente FeatureQueryOrderMember se pierde
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// compatibilidad binaria con quien la esta usando.
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// Para rodearlo, he creado el metodo members.
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return new Iterable<FeatureQueryOrderMember> () { |
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@Override
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public Iterator<FeatureQueryOrderMember> iterator() { |
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return FeatureQueryOrder.this.iterator();
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} |
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}; |
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} |
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public Iterator<FeatureQueryOrderMember> iterator() { |
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if (members == null) { |
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return new Iterator<FeatureQueryOrderMember>() { |
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@Override
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public boolean hasNext() { |
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return false; |
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} |
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@Override
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public FeatureQueryOrderMember next() {
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throw new NoSuchElementException(); |
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} |
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@Override
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public void remove() { |
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throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
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} |
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}; |
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} |
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return members.iterator();
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} |
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public boolean remove(FeatureQueryOrderMember member) { |
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return members.remove(member);
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} |
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public void remove(int index) { |
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members.remove(index); |
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} |
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public void clear() { |
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members.clear(); |
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} |
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public int size() { |
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return this.members.size(); |
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} |
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public int getIndex(String attributeName) { |
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int n = 0; |
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for (FeatureQueryOrderMember member : members) {
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if( member!=null && StringUtils.equalsIgnoreCase(attributeName, member.getAttributeName()) ) { |
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return n;
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} |
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n++; |
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} |
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return -1; |
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} |
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public void movePrevious(String name) { |
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int n = this.getIndex(name); |
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if( n<1 ) { |
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return;
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} |
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Collections.swap(members, n, n-1); |
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} |
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public void moveNext(String name) { |
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int n = this.getIndex(name); |
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if( n>=this.members.size()-1 ) { |
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return;
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} |
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Collections.swap(members, n, n+1); |
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} |
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public boolean isEmpty() { |
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return this.members==null || this.members.isEmpty(); |
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} |
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public FeatureQueryOrderMember get(String attributeName) { |
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for (FeatureQueryOrderMember member : members) {
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if( member!=null && StringUtils.equalsIgnoreCase(attributeName, member.getAttributeName()) ) { |
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return member;
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} |
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} |
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return null; |
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} |
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public boolean contains(String attributeName) { |
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for (FeatureQueryOrderMember member : members) {
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if( member!=null && StringUtils.equalsIgnoreCase(attributeName, member.getAttributeName()) ) { |
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return true; |
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} |
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} |
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return false; |
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} |
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public Comparator<Feature> getFeatureComparator() { |
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return new DefaultFeatureComparator(this); |
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} |
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@Override
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public FeatureQueryOrder clone() throws CloneNotSupportedException { |
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FeatureQueryOrder clone = (FeatureQueryOrder) super.clone();
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if (members != null) { |
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clone.members = new ArrayList(members.size()); |
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for (int i = 0; i < members.size(); i++) { |
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clone.members.add((members.get(i)).clone()); |
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} |
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} |
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return clone;
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} |
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public FeatureQueryOrder getCopy() {
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FeatureQueryOrder aCopy = new FeatureQueryOrder();
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Iterator iter = this.members.iterator(); |
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FeatureQueryOrderMember member; |
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while (iter.hasNext()) {
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member = (FeatureQueryOrderMember) iter.next(); |
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if (member.hasEvaluator()) {
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aCopy.add(member.getEvaluator(), member.getAscending()); |
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} else {
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aCopy.add(member.getAttributeName(), member.getAscending()); |
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} |
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} |
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return aCopy;
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} |
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@Override
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public void loadFromState(PersistentState state) |
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throws PersistenceException {
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this.members = (List) state.get("menbers"); |
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} |
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@Override
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public void saveToState(PersistentState state) throws PersistenceException { |
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state.set("menbers", members);
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} |
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private class DefaultFeatureComparator implements Comparator<Feature> { |
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private final FeatureQueryOrder order; |
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public DefaultFeatureComparator(FeatureQueryOrder order) {
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this.order = order;
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// TODO optimizar en un array???
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} |
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private int myCompare(Object arg0, Object arg1) { |
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if (arg0 == null) { |
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if (arg1 == null) { |
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return 0; |
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} else {
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return 1; |
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} |
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} else if (arg1 == null) { |
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if (arg0 == null) { |
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return 0; |
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} else {
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return 1; |
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} |
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} |
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if (arg0 instanceof Comparable) { |
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return ((Comparable) arg0).compareTo(arg1); |
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} else if (arg1 instanceof Comparable) { |
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return ((Comparable) arg1).compareTo(arg0) * -1; |
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} |
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if (arg0.equals(arg1)) {
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return 0; |
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} else {
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return -1; |
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} |
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} |
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@Override
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public int compare(Feature f0, Feature f1) { |
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Iterator iter = this.order.iterator(); |
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int returnValue = 0; |
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// Feature f0 = (Feature) arg0;
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// Feature f1 = (Feature) arg1;
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Object item;
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String attrName;
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Evaluator evaluator; |
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while (returnValue == 0 && iter.hasNext()) { |
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item = iter.next(); |
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if (item instanceof String) { |
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attrName = (String) item;
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returnValue = this
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.myCompare(f0.get(attrName), f1 |
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.get(attrName)); |
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} else {
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evaluator = (Evaluator) item; |
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try {
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returnValue = this.myCompare(evaluator
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.evaluate((EvaluatorData) f0), evaluator |
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.evaluate((EvaluatorData) f1)); |
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} catch (EvaluatorException e) {
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throw new DataEvaluatorRuntimeException(e); |
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} |
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} |
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} |
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return returnValue;
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} |
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} |
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} |