/*
* 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 java.util.List;
import org.springframework.expression.EvaluationException;
import org.springframework.expression.TypeComparator;
import org.springframework.expression.spel.ExpressionState;
import org.springframework.expression.spel.SpelEvaluationException;
import org.springframework.expression.spel.SpelMessage;
import org.springframework.expression.spel.support.BooleanTypedValue;
/**
* Represents the between operator. The left operand to between must be a single value and the right operand must be a
* list - this operator returns true if the left operand is between (using the registered comparator) the two elements
* in the list. The definition of between being inclusive follows the SQL BETWEEN definition.
*
* @author Andy Clement
* @since 3.0
*/
public class OperatorBetween extends Operator {
public OperatorBetween(int pos, SpelNodeImpl... operands) {
super("between", pos, operands);
}
/**
* Returns a boolean based on whether a value is in the range expressed. The first operand is any value whilst the
* second is a list of two values - those two values being the bounds allowed for the first operand (inclusive).
* @param state the expression state
* @return true if the left operand is in the range specified, false otherwise
* @throws EvaluationException if there is a problem evaluating the expression
*/
@Override
public BooleanTypedValue getValueInternal(ExpressionState state) throws EvaluationException {
Object left = getLeftOperand().getValueInternal(state).getValue();
Object right = getRightOperand().getValueInternal(state).getValue();
if (!(right instanceof List) || ((List<?>) right).size() != 2) {
throw new SpelEvaluationException(getRightOperand().getStartPosition(),
SpelMessage.BETWEEN_RIGHT_OPERAND_MUST_BE_TWO_ELEMENT_LIST);
}
List<?> l = (List<?>) right;
Object low = l.get(0);
Object high = l.get(1);
TypeComparator comparator = state.getTypeComparator();
try {
return BooleanTypedValue.forValue((comparator.compare(left, low) >= 0 && comparator.compare(left, high) <= 0));
} catch (SpelEvaluationException ex) {
ex.setPosition(getStartPosition());
throw ex;
}
}
}
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