svn-gvsig-desktop / trunk / libraries / libGDBMS / src / com / hardcode / gdbms / engine / instruction / LValueTermAdapter.java @ 466
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/*
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* Created on 12-oct-2004
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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.values.Value; |
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/**
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* Adaptador
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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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/**
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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.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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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.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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public void calculateLiteralCondition() { |
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} |
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} |