svn-gvsig-desktop / branches / v2_0_0_prep / libraries / libFMap_dataDB / src / org / gvsig / data / datastores / vectorial / db / jdbc / h2 / H2FeatureCollection.java @ 20973
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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.ReadException; |
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import org.gvsig.data.datastores.vectorial.db.DBDataFeatureCollection; |
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import org.gvsig.data.datastores.vectorial.db.DBFeatureType; |
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import org.gvsig.data.datastores.vectorial.db.jdbc.SQLException; |
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import org.gvsig.data.vectorial.IFeature; |
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import org.gvsig.exceptions.BaseException; |
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public class H2FeatureCollection extends DBDataFeatureCollection { |
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protected DBFeatureType featureType;
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protected String filter; |
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protected String totalFilter; |
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protected H2Store store;
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private String order; |
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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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H2FeatureCollection(H2Store store,DBFeatureType type, String filter, String order) { |
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this.store=store;
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this.featureType=type;
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this.filter=filter;
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this.order=order;
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this.calculateWhere();
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this.calculateOrder();
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if (store.isUseSqlSource()){
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this.sql = store.getSqlSource();
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this.sqlCount = null; |
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} else {
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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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} |
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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 conn = this.store.getConnection(); |
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try {
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Statement st = conn.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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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 void calculateOrder(){ |
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if (isStringEmpty(this.store.getBaseOrder())){ |
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this.totalOrder = this.order; |
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} else {
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this.totalOrder = this.store.getBaseOrder() + ", " +this.order; |
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} |
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} |
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public int size() { |
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checkModified(); |
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try {
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if (this.numReg < 0){ |
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ResultSet r=null; |
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try {
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if (this.sqlCount != null){ |
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r = this.getNewResulset(this.sqlCount); |
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r.next(); |
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numReg = r.getInt(1);
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} else{
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this.numReg = 0; |
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r = this.getNewResulset(this.sql); |
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while (r.next()){
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this.numReg++;
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} |
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} |
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} catch (java.sql.SQLException e) {
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throw new ReadException(this.store.getName(),e); |
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} finally{
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try {
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if (r != null) |
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r.close(); |
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} catch (java.sql.SQLException e) {
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throw new ReadException(this.store.getName(),e); |
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} |
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} |
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} |
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return numReg;
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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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public Iterator iterator() { |
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checkModified(); |
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ResultSet r;
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try {
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r = this.getNewResulset(this.sql); |
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} catch (ReadException e) {
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throw new RuntimeException(e); |
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} |
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H2Iterator dbfIter=new H2Iterator(this.store,this.featureType,r); |
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return dbfIter;
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} |
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protected class H2Iterator implements Iterator{ |
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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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public H2Iterator(H2Store store,DBFeatureType featureType ,ResultSet rs){ |
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this.rs = rs;
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this.store = store;
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this.featureType = featureType;
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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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try {
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if (rs.isLast()){
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return false; |
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} else {
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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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} |
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public Object next() { |
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checkModified(); |
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if (!hasNext())
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throw new NoSuchElementException(); |
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return nextFeature();
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} |
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private IFeature nextFeature() {
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try {
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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, this.featureType); |
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} else {
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rs.close(); |
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rs.getStatement().close(); |
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throw new NoSuchElementException(); |
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} |
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if (rs.isAfterLast()){
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rs.close(); |
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rs.getStatement().close(); |
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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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return feature;
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} catch (BaseException 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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} |
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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.featureType=null; |
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} |
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} |