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 / impl / featureset / AbstractFeatureSet.java @ 44655
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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.impl.featureset; |
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import javax.json.Json; |
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import javax.json.JsonArray; |
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import javax.json.JsonArrayBuilder; |
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import javax.json.JsonObject; |
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import org.gvsig.fmap.dal.DataStore; |
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import org.gvsig.fmap.dal.exception.DataException; |
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import org.gvsig.fmap.dal.feature.Feature; |
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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.impl.DefaultFeature; |
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import org.gvsig.fmap.dal.feature.impl.dynobjectutils.DynObjectSetFeatureSetFacade; |
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import org.gvsig.tools.dispose.DisposableIterator; |
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import org.gvsig.tools.dispose.DisposeUtils; |
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import org.gvsig.tools.dynobject.DynObjectSet; |
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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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import org.gvsig.tools.visitor.impl.AbstractIndexedVisitable; |
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import org.slf4j.Logger; |
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import org.slf4j.LoggerFactory; |
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public abstract class AbstractFeatureSet |
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extends AbstractIndexedVisitable
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implements FeatureSet {
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protected static final Logger LOG = LoggerFactory.getLogger(AbstractFeatureSet.class); |
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public abstract FeatureStore getFeatureStore(); |
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@Override
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public final void accept(Visitor visitor, long firstValueIndex, long elements) throws BaseException { |
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try {
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doAccept(visitor, firstValueIndex, elements); |
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} catch (VisitCanceledException ex) {
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// The visit has been cancelled by the visitor, so we finish here.
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LOG.debug( |
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"The visit, beggining on position {}, has been cancelled "
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+ "by the visitor: {}", new Long(firstValueIndex), |
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visitor); |
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} |
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} |
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@Override
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protected void doAccept(Visitor visitor, long firstValueIndex) |
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throws VisitCanceledException, BaseException {
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doAccept(visitor, firstValueIndex, 0);
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} |
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protected void doAccept(Visitor visitor, long firstValueIndex, long elements) |
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throws VisitCanceledException, BaseException {
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DisposableIterator iterator = fastIterator(firstValueIndex, elements); |
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try {
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while (iterator.hasNext()) {
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Feature feature = (Feature) iterator.next(); |
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visitor.visit(feature); |
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} |
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} finally {
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iterator.dispose(); |
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} |
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} |
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@Override
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public Feature first() {
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DisposableIterator it = null;
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try {
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it = this.iterator();
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if( it == null ) { |
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return null; |
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} |
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if( it.hasNext() ) {
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Feature f = (Feature) it.next(); |
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return f;
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} |
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return null; |
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} finally {
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DisposeUtils.disposeQuietly(it); |
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} |
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} |
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@Override
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public boolean isEmpty() throws DataException { |
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return this.getSize() == 0; |
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} |
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@Override
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public DisposableIterator fastIterator() throws DataException { |
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return this.fastIterator(0); |
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} |
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@Override
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public DisposableIterator iterator() {
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try {
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return this.fastIterator(0); |
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} catch (DataException ex) {
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throw new RuntimeException("Can't obtain itertor.",ex); |
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} |
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} |
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@Override
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public DynObjectSet getDynObjectSet() {
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return this.getDynObjectSet(true); |
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} |
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@Override
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public DynObjectSet getDynObjectSet(boolean fast) { |
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return new DynObjectSetFeatureSetFacade(this, this.getFeatureStore(), fast); |
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} |
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@Override
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public boolean isFromStore(DataStore store) { |
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return this.getFeatureStore().equals(store); |
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} |
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@Override
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public long size64() { |
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try {
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return this.getSize(); |
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} catch (DataException ex) {
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throw new RuntimeException("Can't get size",ex); |
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} |
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} |
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@Override
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public int size() { |
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try {
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long sz = this.getSize(); |
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if( sz > Integer.MAX_VALUE ) { |
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return Integer.MAX_VALUE; |
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} |
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return (int) sz; |
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} catch (DataException ex) {
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throw new RuntimeException("Can't get size",ex); |
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} |
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} |
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public JsonArray toJSON() {
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// TODO: estaria bien hacer una implementacion alternativa que devolviese
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// un JsonArray basado en el FeatureSet/FeaturePagingHelper, asi no
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// tendria que construirse en memoria el JSON entero.
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try {
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JsonArrayBuilder builder = Json.createArrayBuilder(); |
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this.accept(new Visitor() { |
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@Override
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public void visit(Object obj) throws VisitCanceledException, BaseException { |
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DefaultFeature f = (DefaultFeature) obj; |
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JsonObject fjson = f.toJSON(); |
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builder.add(fjson); |
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} |
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}); |
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return builder.build();
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} catch (Exception ex) { |
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throw new RuntimeException("Can't create JSON array.",ex); |
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} |
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} |
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} |