svn-gvsig-desktop / trunk / libraries / libDataSourceDBBaseDrivers / src / org / gvsig / data / datastores / vectorial / db / jdbc / h2 / H2FeatureCollectionEditingFiltered.java @ 20058
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package org.gvsig.data.datastores.vectorial.db.jdbc.h2; |
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import java.sql.Connection; |
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import java.sql.ResultSet; |
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import java.sql.Statement; |
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import java.util.ConcurrentModificationException; |
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import java.util.Iterator; |
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import java.util.NoSuchElementException; |
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import org.gvsig.data.datastores.vectorial.db.DBFeatureType; |
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import org.gvsig.data.datastores.vectorial.db.jdbc.AbstractJDBCDataFeatureCollection; |
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import org.gvsig.data.datastores.vectorial.db.jdbc.JDBCStore; |
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import org.gvsig.data.datastores.vectorial.db.jdbc.exception.SQLException; |
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import org.gvsig.data.exception.ReadException; |
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import org.gvsig.data.vectorial.AbstractFeatureCollection; |
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import org.gvsig.data.vectorial.IFeature; |
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import org.gvsig.data.vectorial.IFeatureType; |
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import org.gvsig.data.vectorial.expansionadapter.FeatureManager; |
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import org.gvsig.data.vectorial.filter.FeatureFilterParser; |
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import org.gvsig.exceptions.BaseException; |
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public class H2FeatureCollectionEditingFiltered extends AbstractJDBCDataFeatureCollection { |
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protected DBFeatureType featureType;
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protected String totalFilter; |
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protected String filter; |
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protected H2Store store;
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private int numReg=-1; |
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private String sql; |
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private String sqlCount; |
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private String totalOrder; |
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private FeatureManager featureManager;
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private FeatureFilterParser parser;
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H2FeatureCollectionEditingFiltered(FeatureManager fm,H2Store store,IFeatureType type,String filter) {
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this.featureManager=fm;
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this.store=store;
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this.featureType=(DBFeatureType)type;
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this.filter = filter;
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this.calculateWhere();
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this.totalOrder = store.getBaseOrder();
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this.sql = this.store.getSqlSelectPart(); |
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this.sqlCount = "Select count(*) From "+ ((H2StoreParameters)this.store.getParameters()).tableID(); |
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if (!isStringEmpty(this.totalFilter)){ |
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this.sql= this.sql + " Where " + this.totalFilter; |
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this.sqlCount= this.sqlCount + " Where " + this.totalFilter; |
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} |
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if (!isStringEmpty(this.totalOrder)){ |
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this.sql= this.sql + " Order by " + this.totalOrder; |
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} |
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if (this.filter!=null) |
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parser = new FeatureFilterParser(filter,this.featureType); |
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} |
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private void calculateWhere(){ |
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if (isStringEmpty(this.store.getBaseWhereClause())){ |
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this.totalFilter = this.filter; |
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} else {
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this.totalFilter = "(" + this.store.getBaseWhereClause() + ") and " +this.filter; |
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} |
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} |
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private ResultSet getNewResulset(String aSql) throws ReadException{ |
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this.store.open();
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Connection con = this.store.getCurrentConnection(); |
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try {
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Statement st = con.createStatement(ResultSet.TYPE_FORWARD_ONLY,ResultSet.CONCUR_READ_ONLY); |
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return st.executeQuery(aSql);
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} catch (java.sql.SQLException e) {
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throw new SQLException(aSql,this.store.getName(),e); |
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} |
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} |
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public int size() { |
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checkModified(); |
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if (this.numReg < 0){ |
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this.numReg=0; |
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try{
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Iterator iter =this.iterator(); |
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while (true){ |
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iter.next(); |
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numReg++; |
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} |
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} catch (NoSuchElementException e){ |
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//Normal condition exit
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} |
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} |
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return numReg;
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} |
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public Iterator iterator() { |
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checkModified(); |
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try{
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ResultSet r=null; |
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r = this.getNewResulset(this.sql); |
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H2Iterator dbIter=new H2Iterator(this.store,r,this.featureType,this.featureManager); |
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return dbIter;
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} catch (BaseException e){
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throw new RuntimeException(e); |
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} |
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} |
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protected class H2Iterator implements Iterator{ |
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private Iterator dbIter; |
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private Iterator mIter; |
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public H2Iterator(H2Store store, ResultSet rs, DBFeatureType featureType,FeatureManager fm){ |
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this.dbIter = new H2IteratorDB(store,rs,featureType,fm); |
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this.mIter = new H2IteratorMemory(featureType,fm); |
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} |
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public boolean hasNext() { |
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checkModified(); |
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return dbIter.hasNext() || mIter.hasNext();
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} |
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public Object next() { |
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checkModified(); |
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if (dbIter.hasNext()){
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return dbIter.next();
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} |
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return mIter.next();
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} |
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public void remove() { |
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throw new UnsupportedOperationException(); |
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} |
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} |
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protected class H2IteratorDB implements Iterator{ |
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private boolean nextChecked=false; |
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private IFeature feature;
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private ResultSet rs; |
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private H2Store store;
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private DBFeatureType featureType;
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private boolean rsEOF=false; |
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private FeatureManager featureManager;
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public H2IteratorDB(H2Store store, ResultSet rs, DBFeatureType featureType, FeatureManager featureManager){ |
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this.store = store;
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this.rs = rs;
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this.featureType = featureType;
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this.featureManager = featureManager;
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} |
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protected void checkModified(){ |
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if (modified)
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throw new ConcurrentModificationException("FeatureCollection modified"); |
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} |
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public boolean hasNext(){ |
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checkModified(); |
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if (nextChecked){
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return this.feature != null; |
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} |
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IFeature feature=null;
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nextChecked=true;
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while (true){ |
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if (!rsEOF){
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try {
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if (rs.isLast()){
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rs.close(); |
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rsEOF=true;
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continue;
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} else {
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feature=nextH2Feature(); |
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if(this.featureManager.isDeleted(feature)) |
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continue;
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this.feature=feature;
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return true; |
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} |
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} catch (java.sql.SQLException e) {
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throw new RuntimeException( |
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new ReadException(this.store.getName(),e) |
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); |
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} |
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}else {
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return false; |
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} |
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} |
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} |
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public Object next() { |
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checkModified(); |
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if (!nextChecked){
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hasNext(); |
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} |
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if (this.feature == null) |
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throw new NoSuchElementException(); |
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nextChecked=false;
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IFeature feature = this.feature;
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this.feature = null; |
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return feature;
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} |
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private IFeature nextH2Feature() {
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IFeature feature=null;
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try {
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if(rs.next()){
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feature=this.store.createFeatureFromResulset(this.rs, featureType); |
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} |
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} catch (java.sql.SQLException e) {
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throw new RuntimeException( |
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new ReadException(this.store.getName(),e) |
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); |
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} catch (ReadException e) {
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throw new RuntimeException(e); |
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} |
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return feature;
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} |
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public void remove() { |
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throw new UnsupportedOperationException(); |
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} |
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} |
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protected class H2IteratorMemory implements Iterator{ |
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protected long position=0; |
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private boolean nextChecked=false; |
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private IFeature feature;
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private FeatureManager featureManager;
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public H2IteratorMemory(DBFeatureType featureType, FeatureManager featureManager){
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position=0;
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this.featureManager=featureManager;
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} |
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protected void checkModified(){ |
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if (modified)
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throw new ConcurrentModificationException("FeatureCollection modified"); |
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} |
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public boolean hasNext(){ |
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checkModified(); |
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if (nextChecked){
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return this.feature != null; |
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} |
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IFeature feature=null;
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nextChecked=true;
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while (true){ |
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if (position<featureManager.getNum()){
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feature=featureManager.getFeature((int)position);
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position++; |
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}else{
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this.feature = null; |
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return false; |
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} |
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if(featureManager.isDeleted(feature))
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continue;
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if (filter == null) { |
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this.feature=feature;
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return true; |
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} else {
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try {
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if (parser.match(feature)){
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this.feature=feature;
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return true; |
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}else{
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continue;
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} |
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} catch (Exception e) { |
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throw new RuntimeException(e); |
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} |
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} |
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} |
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} |
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public Object next() { |
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checkModified(); |
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if (!nextChecked){
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hasNext(); |
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} |
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if (this.feature == null) |
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throw new NoSuchElementException(); |
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nextChecked=false;
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IFeature feature = this.feature;
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this.feature = null; |
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return feature;
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} |
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public void remove() { |
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throw new UnsupportedOperationException(); |
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} |
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} |
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public void dispose() { |
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this.store.deleteObserver(this); |
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this.store = null; |
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this.featureManager = null; |
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this.featureType = null; |
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this.parser= null; |
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} |
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} |