root / trunk / libraries / libFMap / src / com / iver / cit / gvsig / fmap / operations / arcview / ArcJoinDataSource.java @ 37952
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package com.iver.cit.gvsig.fmap.operations.arcview; |
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import com.hardcode.gdbms.driver.exceptions.ReadDriverException; |
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import com.hardcode.gdbms.engine.data.DataSource; |
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import com.hardcode.gdbms.engine.data.persistence.Memento; |
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import com.hardcode.gdbms.engine.data.persistence.MementoException; |
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import com.hardcode.gdbms.engine.data.persistence.OperationLayerMemento; |
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import com.hardcode.gdbms.engine.strategies.OperationDataSource; |
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import com.hardcode.gdbms.engine.values.Value; |
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import com.hardcode.gdbms.engine.values.ValueFactory; |
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/**
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* DOCUMENT ME!
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*
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* @author Fernando Gonz?lez Cort?s
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*/
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public class ArcJoinDataSource extends OperationDataSource { |
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private DataSource source; |
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private DataSource linked; |
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private int[] relation; |
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private int linkFieldindex; |
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public static String prefix = "j_"; |
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private boolean bIsOpen = false; |
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/**
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* DOCUMENT ME!
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*
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* @param result
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* @param source
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* @param linked DOCUMENT ME!
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* @param linkFieldindex DOCUMENT ME!
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*/
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public ArcJoinDataSource(int[] result, DataSource source, |
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DataSource linked, int linkFieldindex) { |
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this.relation = result;
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this.source = source;
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this.linked = linked;
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this.linkFieldindex = linkFieldindex;
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} |
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/**
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* @throws ReadDriverException
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* @see com.hardcode.gdbms.engine.data.DataSource#start()
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*/
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public void start() throws ReadDriverException { |
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// Fjp: Tenemos un problema cuando hacemos join con tablas de base de datos, ya que no podemos
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// estar abriendo y cerrando continuamente el datasource (muy lento, se cuelga gvSIG).
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// Lo correcto ser?a quitar de una vez el AUTOMATIC_DATASOURCE y dejarlo en MANUAL, pero mientras
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// tanto habr? que parchear esto, y tener las tablas de un join abiertas.
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// Creo que esto funciona porque al pedir valores ya hace cada tabla su start.
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// TODO: Comprobar que al hacer el stop no estamos otra vez con el mismo problema. Lo ideal ser?a
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// que no se cerrara y abriera el recordset cada vez que llamamos a getFieldValue, o getRecordCount, etc.
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if (bIsOpen == false) { |
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source.start(); |
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linked.start(); |
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bIsOpen = true;
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} |
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#stop()
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*/
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public void stop() throws ReadDriverException { |
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// source.stop();
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// linked.stop();
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.FieldNameAccess#getFieldIndexByName(java.lang.String)
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*/
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public int getFieldIndexByName(String fieldName) throws ReadDriverException { |
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for (int i = 0; i < getFieldCount(); i++) { |
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if (getFieldName(i).equals(fieldName)){
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return i;
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} |
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} |
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return -1; |
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.ReadDriver#getFieldValue(long, int)
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*/
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public Value getFieldValue(long rowIndex, int fieldId) |
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throws ReadDriverException {
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if (fieldId < source.getFieldCount()) {
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return source.getFieldValue(rowIndex, fieldId);
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} |
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fieldId = fieldId - source.getFieldCount(); |
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if (fieldId >= linkFieldindex) {
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fieldId++; |
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} |
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int index = relation[(int) rowIndex]; |
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if (index == -1) { |
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return ValueFactory.createNullValue();
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} |
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return linked.getFieldValue(index, fieldId);
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.ReadDriver#getFieldCount()
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*/
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public int getFieldCount() throws ReadDriverException { |
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return (source.getFieldCount() + linked.getFieldCount()) - 1; |
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.ReadDriver#getFieldName(int)
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*/
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public String getFieldName(int fieldId) throws ReadDriverException { |
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if (fieldId < source.getFieldCount()) {
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return source.getFieldName(fieldId);
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} |
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fieldId = fieldId - source.getFieldCount(); |
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if (fieldId >= linkFieldindex) {
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fieldId++; |
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} |
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return prefix + linked.getFieldName(fieldId);
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.ReadDriver#getRowCount()
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*/
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public long getRowCount() throws ReadDriverException { |
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return source.getRowCount();
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.ReadDriver#getFieldType(int)
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*/
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public int getFieldType(int i) throws ReadDriverException { |
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if (i < source.getFieldCount()) {
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return source.getFieldType(i);
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} |
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i = i - source.getFieldCount(); |
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if (i >= linkFieldindex) {
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i++; |
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} |
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return linked.getFieldType(i);
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#getMemento()
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*/
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public Memento getMemento() throws MementoException { |
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return new OperationLayerMemento(getName(), |
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new Memento[]{source.getMemento(), linked.getMemento()}, getSQL()); |
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} |
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public int getFieldWidth(int i) throws ReadDriverException { |
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if (i < source.getFieldCount()) {
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return source.getFieldWidth(i);
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} |
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i = i - source.getFieldCount(); |
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if (i >= linkFieldindex) {
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i++; |
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} |
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return linked.getFieldWidth(i);
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} |
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public boolean isVirtualField(int fieldId) throws ReadDriverException { |
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if (fieldId < source.getFieldCount()) {
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return source.isVirtualField(fieldId);
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} |
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fieldId = fieldId - source.getFieldCount(); |
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if (fieldId >= linkFieldindex) {
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fieldId++; |
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} |
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return linked.isVirtualField(fieldId);
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} |
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} |