Revision 1956 trunk/libraries/libGDBMS/src/com/hardcode/gdbms/engine/instruction/LValueTermAdapter.java
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*/ |
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package com.hardcode.gdbms.engine.instruction; |
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import com.hardcode.gdbms.engine.data.DataSource; |
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import com.hardcode.gdbms.engine.data.DriverException; |
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import com.hardcode.gdbms.engine.data.driver.DriverException; |
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import com.hardcode.gdbms.engine.values.Value; |
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* |
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* @author Fernando Gonz?lez Cort?s |
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*/ |
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public class LValueTermAdapter extends AbstractExpression |
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implements FieldSupport {
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private DataSource[] tables; |
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private DataSource source; |
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private Field field = null; |
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public class LValueTermAdapter extends AbstractExpression {
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// private DataSource[] tables; |
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//private DataSource source; |
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private Field field = null; |
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/**
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* @see com.hardcode.gdbms.engine.instruction.Expression#getFieldName()
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*/
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public String getFieldName() {
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return Utilities.getText(getEntity());
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}
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/**
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* @see com.hardcode.gdbms.engine.instruction.Expression#getFieldName()
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*/
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public String getFieldName() {
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return Utilities.getText(getEntity());
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}
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/**
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* @see com.hardcode.gdbms.engine.instruction.Expression#simplify()
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*/
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public void simplify() {
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}
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/**
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* @see com.hardcode.gdbms.engine.instruction.Expression#simplify()
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*/
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public void simplify() {
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}
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/**
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* @see com.hardcode.gdbms.engine.instruction.CachedExpression#evaluate(long)
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*/
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public Value evaluate(long row) throws SemanticException, DriverException {
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return getField().evaluateExpression(row);
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}
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/**
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* @see com.hardcode.gdbms.engine.instruction.CachedExpression#evaluate(long)
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*/
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public Value evaluate(long row) throws SemanticException, DriverException {
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return getField().evaluateExpression(row);
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}
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/** |
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* Obtiene el campo al que referencia este adaptador |
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* |
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* @return Field |
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* |
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* @throws AmbiguousFieldNameException Si hay varios campos con el mismo |
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* nombre y no se especific? la tabla |
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* @throws FieldNotFoundException Si no hay ning?n campo con ese nombre |
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* @throws DriverException Si se produjo un error en el driver |
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* @throws SemanticException Si existe alg?n error sem?ntico en la |
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* instrucci?n |
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*/ |
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private Field getField() |
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throws AmbiguousFieldNameException, FieldNotFoundException, |
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DriverException, SemanticException {
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if (field == null) {
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field = FieldFactory.createField(tables, getFieldName(), source); |
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} |
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/** |
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* Obtiene el campo al que referencia este adaptador |
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* |
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* @return Field |
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* |
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* @throws AmbiguousFieldNameException Si hay varios campos con el mismo |
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* nombre y no se especific? la tabla |
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* @throws FieldNotFoundException Si no hay ning?n campo con ese nombre |
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* @throws DriverException Si se produjo un error en el driver |
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* @throws SemanticException Si existe alg?n error sem?ntico en la |
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* instrucci?n |
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*/ |
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private Field getField() |
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throws AmbiguousFieldNameException, FieldNotFoundException, |
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DriverException, SemanticException {
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if (field == null) {
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field = FieldFactory.createField(getInstructionContext() |
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.getFromTables(), |
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getFieldName(), getInstructionContext().getDs()); |
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} |
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return field;
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}
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return field;
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}
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/**
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* @see com.hardcode.gdbms.engine.instruction.CachedExpression#isLiteral()
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*/
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public boolean isLiteral() {
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return false;
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}
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/**
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* @see com.hardcode.gdbms.engine.instruction.CachedExpression#isLiteral()
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*/
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public boolean isLiteral() {
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return false;
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}
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/** |
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* @see com.hardcode.gdbms.engine.instruction.FieldSupport#setTables(com.hardcode.gdbms.engine.data.DataSource[]) |
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*/ |
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public void setTables(DataSource[] tables) {
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this.tables = tables; |
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} |
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/** |
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* @see com.hardcode.gdbms.engine.instruction.FieldSupport#setDataSource(com.hardcode.gdbms.engine.data.DataSource) |
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*/ |
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public void setDataSource(DataSource source) {
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this.source = source; |
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} |
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/** |
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* @see com.hardcode.gdbms.engine.instruction.Expression#calculateLiteralCondition() |
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*/ |
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