spring OperatorBetween 源码
spring OperatorBetween 代码
文件路径：/spring-expression/src/main/java/org/springframework/expression/spel/ast/OperatorBetween.java
/*
* Copyright 2002-2019 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
*
* https://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 startPos, int endPos, SpelNodeImpl... operands) {
super("between", startPos, endPos, 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<?> list = (List<?>) right;
Object low = list.get(0);
Object high = list.get(1);
TypeComparator comp = state.getTypeComparator();
try {
return BooleanTypedValue.forValue(comp.compare(left, low) >= 0 && comp.compare(left, high) <= 0);
}
catch (SpelEvaluationException ex) {
ex.setPosition(getStartPosition());
throw ex;
}
}
}
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