Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 3

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.fmap.dal.feature.impl;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Iterator;

import java.util.List;

import java.util.ListIterator;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.feature.EditableFeature;

import org.gvsig.fmap.dal.feature.EditableFeatureType;

import org.gvsig.fmap.dal.feature.Feature;

import org.gvsig.fmap.dal.feature.FeatureStore;

import org.gvsig.fmap.dal.feature.FeatureStoreNotification;

import org.gvsig.fmap.dal.feature.FeatureStoreTransform;

import org.gvsig.fmap.dal.feature.FeatureStoreTransforms;

import org.gvsig.fmap.dal.feature.FeatureType;

import org.gvsig.fmap.dal.feature.spi.FeatureProvider;

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.dynobject.DynStruct;

import org.gvsig.tools.dynobject.exception.DynFieldNotFoundException;

import org.gvsig.tools.persistence.Persistent;

import org.gvsig.tools.persistence.PersistentState;

import org.gvsig.tools.persistence.exception.PersistenceException;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

public class DefaultFeatureStoreTransforms

    implements FeatureStoreTransforms,

    Persistent {

    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultFeatureStoreTransforms.class);

    private DefaultFeatureStore store;

    private List<FeatureStoreTransform> transforms;

    private Boolean isTramsformValues;

    private TransformTemporalList lastTransformStack;

    public DefaultFeatureStoreTransforms() {

        this.store = null;

        this.transforms = new ArrayList();

        this.isTramsformValues = false;

    }

    public DefaultFeatureStoreTransforms(DefaultFeatureStore store) {

        this.store = store;

        this.transforms = new ArrayList();

    }

    protected void checkEditingMode() {

        if( store == null || store.getMode() != FeatureStore.MODE_QUERY ) {

            throw new IllegalStateException();

        }

    }

    protected void notifyChangeToStore() {

        this.store.notifyChange(FeatureStoreNotification.TRANSFORM_CHANGE);

    }

    @Override

    public FeatureStoreTransform add(FeatureStoreTransform transform)

        throws DataException {

        checkEditingMode();

        try {

            transform.setUp();

        } catch (Exception ex) {

            throw new RuntimeException("Can't set up transformation.", ex);

        }

        if( transform.getDefaultFeatureType() != null ) {

            if( !transform.getFeatureTypes().contains(transform.getDefaultFeatureType()) ) {

                throw new IllegalArgumentException(); // FIXME: Add specific type

            }

            this.transforms.add(transform);

            transform.setFeatureStore(store);

            transform.setSourceMetadata(this.store.metadata);

            this.notifyChangeToStore();

            if( this.isTramsformValues == null || (!this.isTramsformValues) ) {

                if( transform.isTransformsOriginalValues() ) {

                    this.isTramsformValues = true;

                }

            }

        }

        return transform;

    }

    @Override

    public void clear() {

        checkEditingMode();

        this.transforms.clear();

        this.notifyChangeToStore();

        this.isTramsformValues = Boolean.FALSE;

    }

    @Override

    public FeatureStoreTransform getTransform(int index) {

        return (FeatureStoreTransform) this.transforms.get(index);

    }

    @Override

    public Iterator<FeatureStoreTransform> iterator() {

        return Collections.unmodifiableList(transforms).iterator();

    }

    @Override

    public Object remove(int index) {

        checkEditingMode();

        Object trans = this.transforms.remove(index);

        this.notifyChangeToStore();

        this.isTramsformValues = null;

        return trans;

    }

    @Override

    public boolean remove(FeatureStoreTransform transform) {

        checkEditingMode();

        boolean removed = this.transforms.remove(transform);

        if( removed ) {

            this.notifyChangeToStore();

        }

        this.isTramsformValues = null;

        return removed;

    }

    @Override

    public int size() {

        return this.transforms.size();

    }

    @Override

    public boolean isEmpty() {

        return this.transforms.isEmpty();

    }

    private class TransformTemporalListElement {

        public FeatureStoreTransform transform = null;

        public FeatureType targetFeatureType = null;

    }

    private class TransformTemporalList

        extends ArrayList {

        /**

         *

         */

        private static final long serialVersionUID = 1677014259279944000L;

        private FeatureType targetFType;

        @Override

        public boolean add(Object arg0) {

            if( this.isEmpty() ) {

                targetFType = ((TransformTemporalListElement) arg0).targetFeatureType;

            }

            return super.add(arg0);

        }

    }

    private TransformTemporalList getTransformTemporalList(FeatureType targetFeatureType) {

        if( this.lastTransformStack == null

            || this.lastTransformStack.size() != this.transforms.size()

            || !(this.lastTransformStack.targetFType.equals(targetFeatureType)) ) {

            TransformTemporalList result = new TransformTemporalList();

            TransformTemporalListElement item;

            FeatureType nextFType = targetFeatureType;

            for( int i = transforms.size() - 1; i > -1; i-- ) {

                item = new TransformTemporalListElement();

                item.transform = (FeatureStoreTransform) transforms.get(i);

                item.targetFeatureType = nextFType;

                nextFType = item.transform.getSourceFeatureTypeFrom(item.targetFeatureType);

                result.add(item);

            }

            this.lastTransformStack = result;

        }

        return this.lastTransformStack;

    }

    public Feature applyTransform(DefaultFeature source,

        FeatureType targetFeatureType)

        throws DataException {

        if( this.transforms.isEmpty() ) {

            return source;

        }

        TransformTemporalList stack = this

            .getTransformTemporalList(targetFeatureType);

        TransformTemporalListElement item;

        FeatureProvider targetData;

        EditableFeature target;

        ListIterator iterator = stack.listIterator(stack.size());

        FeatureType tft = null;

        while( iterator.hasPrevious() ) {

            item = (TransformTemporalListElement) iterator.previous();

            tft = item.targetFeatureType;

            if( tft instanceof EditableFeatureType ) {

                /*

                             * Must be non-editable to create 

                             * DefaultFeatureProvider

                 */

                tft = ((EditableFeatureType) tft).getNotEditableCopy();

            }

            targetData = this.store.createDefaultFeatureProvider(tft);

            targetData.setOID(source.getData().getOID());

            targetData.setNew(false);

            target = new DefaultEditableFeature(this.store, targetData);

            item.transform.applyTransform(source, target);

            source = (DefaultFeature) target.getNotEditableCopy();

        }

        return source;

    }

    public FeatureType getSourceFeatureTypeFrom(FeatureType targetFeatureType) {

        FeatureType tmpFType = targetFeatureType;

        for( int i = transforms.size() - 1; i > -1; i-- ) {

            FeatureStoreTransform transform = transforms.get(i);

            tmpFType = transform.getSourceFeatureTypeFrom(tmpFType);

        }

        return tmpFType;

    }

    public FeatureType getDefaultFeatureType() throws DataException {

        if( this.transforms.isEmpty() ) {

            return null;

        }

        FeatureStoreTransform transform = this.transforms.get(this.transforms.size() - 1);

        return transform.getDefaultFeatureType();

    }

    public List<FeatureType> getFeatureTypes() throws DataException {

        if( this.transforms.isEmpty() ) {

            return null;

        }

        FeatureStoreTransform transform = this.transforms.get(this.transforms.size() - 1);

        return transform.getFeatureTypes();

    }

    public FeatureStore getFeatureStore() {

        return this.store;

    }

    public void setFeatureStore(FeatureStore featureStore) {

        if( this.store != null ) {

            throw new IllegalStateException();

        }

        this.store = (DefaultFeatureStore) featureStore;

        for( FeatureStoreTransform transform : this ) {

            transform.setFeatureStore(featureStore);

        }

    }

    public void setStoreForClone(FeatureStore featureStore) {

        this.store = (DefaultFeatureStore) featureStore;

    }

    @Override

    public boolean isTransformsOriginalValues() {

        if( this.isTramsformValues == null ) {

            this.isTramsformValues = false;

            for( FeatureStoreTransform transform : this ) {

                if( transform.isTransformsOriginalValues() ) {

                    this.isTramsformValues = true;

                    break;

                }

            }

        }

        return this.isTramsformValues;

    }

    public FeatureType getFeatureType(String featureTypeId)

        throws DataException {

        if( this.transforms.isEmpty() ) {

            return null;

        }

        if( featureTypeId == null ) {

            return this.getDefaultFeatureType();

        }

        for( FeatureType fType : (List<FeatureType>) this.getFeatureTypes() ) {

        } 

        Iterator iter = this.getFeatureTypes().iterator();

        FeatureType fType;

        while( iter.hasNext() ) {

            fType = (FeatureType) iter.next();

            if( fType.getId().equals(featureTypeId) ) {

                return fType;

            }

        }

        return null;

    }

    @Override

    public void saveToState(PersistentState state) throws PersistenceException {

        // state.set("store", store);

        state.set("isTramsformValues", this.isTramsformValues);

        state.set("transforms", this.transforms);

    }

    @Override

    public void loadFromState(PersistentState state)

        throws PersistenceException {

        this.isTramsformValues = (Boolean) state.get("isTramsformValues");

        this.transforms = new ArrayList();

        List<FeatureStoreTransform> x = (List<FeatureStoreTransform>) state.get("transforms");

        this.transforms.addAll(x);

        // this.store = (DefaultFeatureStore) state.get("store");

    }

    public static void registerPersistent() {

        DynStruct definition = ToolsLocator.getPersistenceManager().addDefinition(

            DefaultFeatureStoreTransforms.class,

            "DefaultFeatureStoreTransforms",

            "DefaultFeatureStoreTransforms Persistent definition",

            null,

            null

        );

        definition.addDynFieldBoolean("isTramsformValues").setMandatory(false);

        definition.addDynFieldList("transforms").setClassOfItems(FeatureStoreTransform.class).setMandatory(true);

        definition.addDynFieldObject("store").setClassOfValue(FeatureStore.class).setMandatory(false);

    }

    public Object getDynValue(String name) throws DynFieldNotFoundException {

        if( !this.transforms.isEmpty() ) {

            for (int i = this.transforms.size() - 1; i >= 0; i--) {

                FeatureStoreTransform transform = transforms.get(i);

                if( transform!=null && transform.hasDynValue(name) ) {

                    Object value;

                    try {

                        value = transform.getDynValue(name);

                        if( value!=null ) {

                            return value;

                        }

                    } catch(Exception ex) {

                        LOGGER.warn("Cant retrieve value of '"+name+ "' in transform '"+transform.getName()+"'.", ex);

                    }

                }

            }

        }

        return null;

    }

    public void setDynValue(String name, Object value) throws DynFieldNotFoundException {

        if( !this.transforms.isEmpty() ) {

            FeatureStoreTransform transform = (FeatureStoreTransform) transforms.get(this.transforms.size() - 1);

            transform.setDynValue(name, value);

        }

    }

    public boolean hasDynValue(String name) {

        if( !this.transforms.isEmpty() ) {

            for (int i = this.transforms.size() - 1; i >= 0; i--) {

                FeatureStoreTransform transform = transforms.get(i);                

                if( transform.hasDynValue(name) ) {

                    return true;

                }

            }

        }

        return false;

    }

    @Override

    public Object clone() throws CloneNotSupportedException {

        DefaultFeatureStoreTransforms cloned = (DefaultFeatureStoreTransforms) super.clone();

        cloned.transforms = new ArrayList();

        for( FeatureStoreTransform transform : transforms ) {

            cloned.transforms.add((FeatureStoreTransform) transform.clone());

        }

        cloned.lastTransformStack = null;

        return cloned;

    }

}