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Spring Expression Language (SpEL)
/*
* Copyright 2002-2021 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.math.BigDecimal;
import java.math.BigInteger;
import org.springframework.asm.MethodVisitor;
import org.springframework.expression.EvaluationException;
import org.springframework.expression.spel.CodeFlow;
import org.springframework.expression.spel.ExpressionState;
import org.springframework.expression.spel.support.BooleanTypedValue;
import org.springframework.util.NumberUtils;
/**
* Implements the greater-than operator.
*
* @author Andy Clement
* @author Juergen Hoeller
* @author Giovanni Dall'Oglio Risso
* @since 3.0
*/
public class OpGT extends Operator {
public OpGT(int startPos, int endPos, SpelNodeImpl... operands) {
super(">", startPos, endPos, operands);
this.exitTypeDescriptor = "Z";
}
@Override
public BooleanTypedValue getValueInternal(ExpressionState state) throws EvaluationException {
Object left = getLeftOperand().getValueInternal(state).getValue();
Object right = getRightOperand().getValueInternal(state).getValue();
this.leftActualDescriptor = CodeFlow.toDescriptorFromObject(left);
this.rightActualDescriptor = CodeFlow.toDescriptorFromObject(right);
if (left instanceof Number leftNumber && right instanceof Number rightNumber) {
if (leftNumber instanceof BigDecimal || rightNumber instanceof BigDecimal) {
BigDecimal leftBigDecimal = NumberUtils.convertNumberToTargetClass(leftNumber, BigDecimal.class);
BigDecimal rightBigDecimal = NumberUtils.convertNumberToTargetClass(rightNumber, BigDecimal.class);
return BooleanTypedValue.forValue(leftBigDecimal.compareTo(rightBigDecimal) > 0);
}
else if (leftNumber instanceof Double || rightNumber instanceof Double) {
return BooleanTypedValue.forValue(leftNumber.doubleValue() > rightNumber.doubleValue());
}
else if (leftNumber instanceof Float || rightNumber instanceof Float) {
return BooleanTypedValue.forValue(leftNumber.floatValue() > rightNumber.floatValue());
}
else if (leftNumber instanceof BigInteger || rightNumber instanceof BigInteger) {
BigInteger leftBigInteger = NumberUtils.convertNumberToTargetClass(leftNumber, BigInteger.class);
BigInteger rightBigInteger = NumberUtils.convertNumberToTargetClass(rightNumber, BigInteger.class);
return BooleanTypedValue.forValue(leftBigInteger.compareTo(rightBigInteger) > 0);
}
else if (leftNumber instanceof Long || rightNumber instanceof Long) {
return BooleanTypedValue.forValue(leftNumber.longValue() > rightNumber.longValue());
}
else if (leftNumber instanceof Integer || rightNumber instanceof Integer) {
return BooleanTypedValue.forValue(leftNumber.intValue() > rightNumber.intValue());
}
else if (leftNumber instanceof Short || rightNumber instanceof Short) {
return BooleanTypedValue.forValue(leftNumber.shortValue() > rightNumber.shortValue());
}
else if (leftNumber instanceof Byte || rightNumber instanceof Byte) {
return BooleanTypedValue.forValue(leftNumber.byteValue() > rightNumber.byteValue());
}
else {
// Unknown Number subtypes -> best guess is double comparison
return BooleanTypedValue.forValue(leftNumber.doubleValue() > rightNumber.doubleValue());
}
}
if (left instanceof CharSequence && right instanceof CharSequence) {
left = left.toString();
right = right.toString();
}
return BooleanTypedValue.forValue(state.getTypeComparator().compare(left, right) > 0);
}
@Override
public boolean isCompilable() {
return isCompilableOperatorUsingNumerics();
}
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
generateComparisonCode(mv, cf, IFLE, IF_ICMPLE);
}
}