/*
* Copyright 2002-2009 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.expression.spel.ast;
import org.springframework.expression.EvaluationException;
import org.springframework.expression.spel.ExpressionState;
import org.springframework.expression.spel.support.BooleanTypedValue;
/**
* Implements the less-than operator.
*
* @author Andy Clement
* @since 3.0
*/
public class OpLT extends Operator {
public OpLT(int pos, SpelNodeImpl... operands) {
super("<", pos, operands);
}
@Override
public BooleanTypedValue getValueInternal(ExpressionState state) throws EvaluationException {
Object left = getLeftOperand().getValueInternal(state).getValue();
Object right = getRightOperand().getValueInternal(state).getValue();
// TODO could leave all of these to the comparator - just seems quicker to do some here
if (left instanceof Number && right instanceof Number) {
Number leftNumber = (Number) left;
Number rightNumber = (Number) right;
if (leftNumber instanceof Double || rightNumber instanceof Double) {
return BooleanTypedValue.forValue(leftNumber.doubleValue() < rightNumber.doubleValue());
} else if (leftNumber instanceof Long || rightNumber instanceof Long) {
return BooleanTypedValue.forValue(leftNumber.longValue() < rightNumber.longValue());
} else {
return BooleanTypedValue.forValue(leftNumber.intValue() < rightNumber.intValue());
}
}
return BooleanTypedValue.forValue(state.getTypeComparator().compare(left, right) < 0);
}
}
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