svn-gvsig-desktop / 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 / MulOperator.java @ 44198
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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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public class MulOperator |
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extends AbstractBinaryOperator
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implements Optimizer.FunctionOptimizer
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{
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public static final String NAME = "*"; |
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public MulOperator() {
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super(Function.GROUP_NUMERIC, NAME);
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} |
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@Override
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public boolean allowConstantFolding() { |
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return true; |
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} |
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@Override
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public Object call(Interpreter interpreter, Object op1, Object op2) { |
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int type = this.getType(op1, op2); |
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if( (type & TYPE_DOUBLE) == TYPE_DOUBLE ) {
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double value = ((Number) op1).doubleValue() * ((Number) op2).doubleValue(); |
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return value;
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} |
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if( (type & TYPE_FLOAT) == TYPE_FLOAT ) {
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double value = ((Number) op1).floatValue() * ((Number) op2).floatValue(); |
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return value;
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} |
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if( (type & TYPE_LONG) == TYPE_LONG ) {
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long value = ((Number) op1).longValue() * ((Number) op2).longValue(); |
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return value;
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} |
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if( (type & TYPE_INT) == TYPE_INT ) {
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int value = ((Number) op1).intValue() * ((Number) op2).intValue(); |
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return value;
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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.parameters().get(0));
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Code op2 = optimizer.optimize(caller.parameters().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 ( op1.code() == Code.CONSTANT ) { |
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Object value = ((Code.Constant)op1).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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Code newCode = optimizer.getCodeBuilder().constant(0);
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return newCode;
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} else if( n == 1 ) { |
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return op2;
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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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} 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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Code newCode = optimizer.getCodeBuilder().constant(0);
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return newCode;
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} else if( n == 1 ) { |
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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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} |