svn-gvsig-desktop / branches / v2_0_0_prep / libraries / libFMap_dataDB / src / org / gvsig / data / datastores / vectorial / db / jdbc / postgresql / PostgresqlFeatureCollectionEditing.java @ 20973
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package org.gvsig.data.datastores.vectorial.db.jdbc.postgresql; |
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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.Iterator; |
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import java.util.NoSuchElementException; |
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import org.gvsig.data.InitializeException; |
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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.FeatureManager; |
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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.exceptions.BaseException; |
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public class PostgresqlFeatureCollectionEditing extends DBDataFeatureCollection { |
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protected DBFeatureType featureType;
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protected String totalFilter; |
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protected PostgresqlStore 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 int fetchSize=5000; |
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private FeatureManager featureManager;
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PostgresqlFeatureCollectionEditing(FeatureManager fm,PostgresqlStore store,IFeatureType type) {
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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.totalFilter =store.getBaseWhereClause();
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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 "+ ((PostgresqlStoreParameters)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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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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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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r = this.getNewResulset(this.sqlCount); |
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try {
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r.next(); |
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numReg = r.getInt(1);
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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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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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numReg = numReg+featureManager.getNum(); |
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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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try{
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ResultSet r=null; |
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r = this.getNewResulset(this.sql); |
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PostgresIterator dbIter=new PostgresIterator(this.store,this.featureType,this.sql,this.fetchSize); |
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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 PostgresIterator implements Iterator{ |
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private ResultSet rs; |
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private boolean nextChecked=false; |
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private IFeature feature;
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private PostgresqlStore store;
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private DBFeatureType featureType;
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private String sql; |
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private int fetchSize; |
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private int page; |
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private int index; |
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private long position; |
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private boolean rsEOF=false; |
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public PostgresIterator(PostgresqlStore store, DBFeatureType featureType,String sql,int fetchSize) throws ReadException{ |
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this.sql = sql;
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this.store = store;
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this.featureType = featureType;
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this.fetchSize= fetchSize;
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this.page = 0; |
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this.index = 0; |
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this.createResulset();
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} |
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public boolean hasNext(){ |
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checkModified(); |
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IFeature feature=null;
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if (nextChecked){
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return feature != null; |
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} |
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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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if (this.index == this.fetchSize){ |
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this.index = 0; |
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this.page++;
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this.createResulset();
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if (rs.isLast()){
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rsEOF = true;
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rs.close(); |
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continue;
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} |
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} else{
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rsEOF = true;
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rs.close(); |
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continue;
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} |
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} else {
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feature=nextFeature(); |
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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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}else {
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if (position<featureManager.getNum()){
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try {
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feature=featureManager.getFeature((int)position,store);
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} catch (ReadException e) {
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throw new RuntimeException(e); |
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} |
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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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} |
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IFeature tmp; |
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try {
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tmp = featureManager.getFeature(feature.getID(), store); |
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} catch (InitializeException e) {
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throw new RuntimeException(e); |
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} |
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if (tmp != null){ |
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feature = tmp; |
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}else if(featureManager.isDeleted(feature)) |
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continue;
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position++; |
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this.feature=feature;
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return true; |
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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 (feature == null) |
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throw new NoSuchElementException(); |
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nextChecked=false;
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return feature;
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} |
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private IFeature nextFeature() {
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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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protected void createResulset() throws ReadException{ |
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this.store.open();
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String mSql = PostgresqlStoreUtils.addLimitsToSQL(
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this.sql,
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this.fetchSize,
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this.page);
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Connection conn = ((PostgresqlStore)this.store).getConnection(); |
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try {
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if (this.rs != null){ |
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this.rs.close();
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// this.rs.getStatement().close();
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} |
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Statement st = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY,ResultSet.CONCUR_READ_ONLY); |
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// System.out.println(mSql);
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this.rs = st.executeQuery(mSql);
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} catch (java.sql.SQLException e) {
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throw new SQLException(mSql,this.store.getName(),e); |
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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.featureManager = null; |
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this.featureType = null; |
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} |
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} |