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.editing.memory;

import java.lang.ref.WeakReference;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

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

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

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

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

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

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

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

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

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

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

import org.gvsig.fmap.dal.feature.impl.DefaultFeatureStoreTransforms;

import org.gvsig.fmap.dal.feature.spi.FeatureStoreProvider.FeatureTypeChanged;

import org.gvsig.tools.persistence.PersistentState;

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

public class FeatureTypeManager {

    private final ExpansionAdapter expansionAdapter;

    private final Map<String,Integer> added = new HashMap();

    private final Map<String,Integer> modifiedFromOriginal = new HashMap();

    private final List<String> deleted = new ArrayList();

    private final FeatureTypeManagerFeatureStoreTransforms transforms;

    private final FeatureStore store;

    private int deltaSize = 0;

    private boolean first = true;

    private FeatureType originalType = null;

    public FeatureTypeManager(FeatureStore store) {

        this.expansionAdapter = new MemoryExpansionAdapter();

        this.store = store;

        this.transforms = new FeatureTypeManagerFeatureStoreTransforms();

        this.transforms.setFeatureStore(store);

    }

    public void dispose() {

        this.expansionAdapter.close();

        this.deleted.clear();

        this.transforms.clear();

        this.added.clear();

        this.modifiedFromOriginal.clear();

    }

    public FeatureType getType(String id) throws DataException {

        Integer num = added.get(id);

        if (num == null) {

            num = modifiedFromOriginal.get(id);

            if (num == null) {

                return null;

            }

        }

        if (num == -1) {

            /*

             * This happens for example when we are going back to the

             * original feature type which is not managed by

             * expansionAdapter

             */

            return null;

        }

        FeatureType type = (FeatureType) expansionAdapter.getObject(num);

        return type;

    }

    public int update(FeatureType type, FeatureType oldType) {

        // deleted.add(oldType.getId());

        if (first) {

            originalType = oldType;

            first = false;

        }

        int oldNum = -1;

        int num = expansionAdapter.addObject(type);

        String id = type.getId();

        if (added.containsKey(id)) {

            oldNum = added.get(id);

            added.put(id, num);

        } else {

            if (modifiedFromOriginal.get(id) != null) {

                oldNum = modifiedFromOriginal.get(id);

            }

            modifiedFromOriginal.put(id, num);

        }

        try {

            this.transforms.add(new UpdateFeatureTypeTransform(this.store,

                    oldType, type));

        } catch (DataException e) {

            throw new RuntimeException(); // FIXME (pero esto no deberia de

            // pasar nunca)

        }

        return oldNum;

    }

    private class UpdateFeatureTypeTransform extends AbstractFeatureStoreTransform {

        private final FeatureType ftSource;

        private EditableFeatureType ftTarget_editable;

        private final FeatureType ftTarget_non_editable;

        private WeakReference wkRefStore;

        private List ftypes = null;

        private List attrInSourceToUse;

        UpdateFeatureTypeTransform(FeatureStore featureStore,

                FeatureType ftSource, FeatureType ftTarget) {

            this.ftSource = ftSource;

            if (ftTarget instanceof EditableFeatureType) {

                ftTarget_editable = (EditableFeatureType) ftTarget;

                ftTarget_non_editable = ftTarget_editable.getNotEditableCopy();

            } else {

                ftTarget_non_editable = ftTarget;

            }

            this.wkRefStore = new WeakReference(featureStore);

            this.initializeAttributesToUse();

        }

        private void initializeAttributesToUse() {

            attrInSourceToUse = new ArrayList();

            Iterator iter;

            if (ftTarget_editable != null) {

                iter = ftTarget_editable.iterator();

            } else {

                iter = ftTarget_non_editable.iterator();

            }

            FeatureAttributeDescriptor tAttr, sAttr;

            EditableFeatureAttributeDescriptor ead;

            while (iter.hasNext()) {

                tAttr = (FeatureAttributeDescriptor) iter.next();

                sAttr = this.ftSource.getAttributeDescriptor(tAttr.getName());

                if (sAttr == null) {

                    if (tAttr instanceof EditableFeatureAttributeDescriptor) {

                        ead = (EditableFeatureAttributeDescriptor) tAttr;

                        if (ead.getOriginalName() != null) {

                            sAttr = this.ftSource.getAttributeDescriptor(ead.getOriginalName());

                            if (sAttr == null) {

                                continue;

                            }

                        } else {

                            continue;

                        }

                    } else {

                        continue;

                    }

                }

                if (tAttr.getType() != sAttr.getType()) {

                    /*

                     * Ignore if type is not the same (user removed field

                     * and added another with same name but different type)

                     */

                    continue;

                }

                attrInSourceToUse.add(sAttr.getName());

            }

        }

        @Override

        public void setUp() throws Exception {

        }

        @Override

        public void applyTransform(Feature source, EditableFeature target)

                throws DataException {

            Iterator iter = target.getType().iterator();

            FeatureAttributeDescriptor tAttr;

            FeatureAttributeDescriptor tAttr_edi;

            FeatureAttributeDescriptor srcAtt;

            /*

             * field name in source feature

             */

            String s_name;

            /*

             * field name in target feature (the same as in source

             * except if renamed)

             */

            String t_name;

            EditableFeatureAttributeDescriptor eatd;

            while (iter.hasNext()) {

                tAttr = (FeatureAttributeDescriptor) iter.next();

                if (ftTarget_editable != null) {

                    /*

                     * If target FT is editable, try to get original name

                     */

                    t_name = tAttr.getName();

                    s_name = t_name;

                    tAttr_edi = ftTarget_editable.getAttributeDescriptor(t_name);

                    if (tAttr_edi instanceof EditableFeatureAttributeDescriptor) {

                        eatd = (EditableFeatureAttributeDescriptor) tAttr_edi;

                        s_name = eatd.getOriginalName();

                    }

                    /*

                     * If not found, use normal name

                     */

                    if (s_name == null) {

                        s_name = tAttr.getName();

                    }

                } else {

                    /*

                     * If target FT is not editable, use normal name

                     */

                    t_name = tAttr.getName();

                    s_name = t_name;

                }

                srcAtt = source.getType().getAttributeDescriptor(s_name);

                if (srcAtt != null

                        && /*

                         * This prevents the case when user has removed field and

                         * added new field with same name and different type.

                         * In that case, value will be the default value (else below)

                         */ srcAtt.getType() == tAttr.getType()) {

                    target.set(t_name, source.get(s_name));

                } else {

                    target.set(t_name, tAttr.getDefaultValue());

                }

            }

        }

        @Override

        public FeatureType getDefaultFeatureType() throws DataException {

            return this.ftTarget_non_editable;

        }

        @Override

        public FeatureStore getFeatureStore() {

            return (FeatureStore) this.wkRefStore.get();

        }

        @Override

        public List getFeatureTypes() throws DataException {

            if (this.ftypes == null) {

                this.ftypes = Arrays

                        .asList(new FeatureType[]{this.ftTarget_non_editable});

            }

            return this.ftypes;

        }

        @Override

        public FeatureType getSourceFeatureTypeFrom(

                FeatureType targetFeatureType) {

            EditableFeatureType orgType = ftSource.getEditable();

            Iterator iter = orgType.iterator();

            FeatureAttributeDescriptor attr;

            EditableFeatureAttributeDescriptor efad;

            while (iter.hasNext()) {

                attr = (FeatureAttributeDescriptor) iter.next();

                if (!attrInSourceToUse.contains(attr.getName())) {

                    if (attr instanceof EditableFeatureAttributeDescriptor) {

                        efad = (EditableFeatureAttributeDescriptor) attr;

                        if (efad.getOriginalName() != null

                                && !attrInSourceToUse.contains(efad.getOriginalName())) {

                            iter.remove();

                        }

                    } else {

                        iter.remove();

                    }

                }

            }

            return orgType.getNotEditableCopy();

        }

        @Override

        public void setFeatureStore(FeatureStore featureStore) {

            this.wkRefStore = new WeakReference(featureStore);

        }

        @Override

        public boolean isTransformsOriginalValues() {

            return false;

        }

    }

    public void restore(String id) {

        deleted.remove(id);

        deltaSize++;

    }

    public void restore(String id, int num) {

        if (added.containsKey(id)) {

            added.put(id, num);

        } else {

            modifiedFromOriginal.put(id, num);

        }

    }

    public boolean isDeleted(FeatureType type) {

        return deleted.contains(type.getId());

    }

    public boolean isDeleted(String id) {

        return deleted.contains(id);

    }

    public void clear() {

        added.clear();

        modifiedFromOriginal.clear();

        expansionAdapter.close();

        deleted.clear();

        deltaSize = 0;

    }

    public boolean hasChanges() {

        return added.size() > 0 || modifiedFromOriginal.size() > 0

                || deleted.size() > 0;

    }

    public Iterator newsIterator() {

        return added.values().iterator();

    }

    public boolean hasNews() {

        return !added.isEmpty();

    }

    public long getDeltaSize() {

        return deltaSize;

    }

    public FeatureType getOriginalFeatureType() {

        return originalType;

    }

    public DefaultFeatureStoreTransforms getTransforms() {

        return this.transforms;

    }

    public class FeatureTypeManagerFeatureStoreTransforms extends

            DefaultFeatureStoreTransforms {

        private FeatureTypeManagerFeatureStoreTransforms() {

        }

        @Override

        protected void checkEditingMode() {

        }

        @Override

        protected void notifyChangeToStore() {

        }

        public PersistentState getState() throws PersistenceException {

            // FIXME

            throw new UnsupportedOperationException();

        }

        public void loadState(PersistentState state)

                throws PersistenceException {

            // FIXME

            throw new UnsupportedOperationException();

        }

        @Override

        public void loadFromState(PersistentState state) throws PersistenceException {

            // FIXME

            throw new UnsupportedOperationException();

        }

        @Override

        public FeatureStoreTransform add(FeatureStoreTransform transform)

                throws DataException {

            if (!(transform instanceof UpdateFeatureTypeTransform)) {

                // FIXME

                throw new IllegalArgumentException();

            }

            return super.add(transform);

        }

    }

    public class FeatureTypesChangedItem implements FeatureTypeChanged {

        private final FeatureType source;

        private final FeatureType target;

        public FeatureTypesChangedItem(FeatureType source, FeatureType target) {

            this.source = source;

            this.target = target;

        }

        @Override

        public FeatureType getSource() {

            return source;

        }

        @Override

        public FeatureType getTarget() {

            return target;

        }

    }

    public Iterator getFeatureTypesChanged() throws DataException {

        // FIXME this don't work for Store.fType.size() > 1

        List list = new ArrayList();

        if (modifiedFromOriginal.size() > 0) {

            FeatureType src = this.getOriginalFeatureType();

            list.add(new FeatureTypesChangedItem(src, this.store

                    .getFeatureType(src.getId())));

        }

        return list.iterator();

    }

}