Revision 44010 trunk/org.gvsig.desktop/org.gvsig.desktop.library/org.gvsig.expressionevaluator/org.gvsig.expressionevaluator.lib/org.gvsig.expressionevaluator.lib.impl/src/main/java/org/gvsig/expressionevaluator/impl/function/operator/SubstOperator.java
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package org.gvsig.expressionevaluator.impl.function.operator; |
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import org.gvsig.expressionevaluator.Code; |
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import org.gvsig.expressionevaluator.Function; |
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import org.gvsig.expressionevaluator.Interpreter; |
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import org.gvsig.expressionevaluator.Optimizer; |
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import org.gvsig.expressionevaluator.Optimizer.FunctionOptimizer; |
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public class SubstOperator extends AbstractBinaryOperator {
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public class SubstOperator |
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extends AbstractBinaryOperator |
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implements FunctionOptimizer |
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{
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public SubstOperator() {
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super(Function.GROUP_NUMERIC,"-"); |
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} |
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} |
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throw new IllegalArgumentException("Types not allowed in '"+name()+"' operand.");
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} |
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@Override |
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public Code optimize(Optimizer optimizer, Code.Caller caller) {
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Code op1 = optimizer.optimize(caller.args().get(0)); |
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Code op2 = optimizer.optimize(caller.args().get(1)); |
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if ( op1.code() == Code.CONSTANT && op2.code() == Code.CONSTANT) {
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Code newCode = optimizer.getCodeBuilder().constant( |
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call( |
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optimizer.getInterpreter(), |
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((Code.Constant)op1).value(), |
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((Code.Constant)op2).value() |
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) |
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); |
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return newCode; |
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} else if ( op2.code() == Code.CONSTANT ) {
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Object value = ((Code.Constant)op2).value(); |
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if( value instanceof Number ) {
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double n = ((Number) value).doubleValue(); |
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if( n == 0 ) {
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return op1; |
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} |
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} |
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Code newCode = optimizer.getCodeBuilder().operator(caller.name(), op1, op2); |
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return newCode; |
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} |
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return caller; |
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} |
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} |
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