/*
* 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.Operation;
import org.springframework.expression.TypedValue;
import org.springframework.expression.spel.ExpressionState;
/**
* The plus operator will:
* <ul>
* <li>add doubles (floats are represented as doubles)
* <li>add longs
* <li>add integers
* <li>concatenate strings
* </ul>
* It can be used as a unary operator for numbers (double/long/int). The standard promotions are performed
* when the operand types vary (double+int=double). For other options it defers to the registered overloader.
*
* @author Andy Clement
* @since 3.0
*/
public class OpPlus extends Operator {
public OpPlus(int pos, SpelNodeImpl... operands) {
super("+", pos, operands);
}
@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
SpelNodeImpl leftOp = getLeftOperand();
SpelNodeImpl rightOp = getRightOperand();
if (rightOp == null) { // If only one operand, then this is unary plus
Object operandOne = leftOp.getValueInternal(state).getValue();
if (operandOne instanceof Number) {
if (operandOne instanceof Double) {
return new TypedValue(((Double) operandOne).doubleValue());
} else if (operandOne instanceof Long) {
return new TypedValue(((Long) operandOne).longValue());
} else {
return new TypedValue(((Integer) operandOne).intValue());
}
}
return state.operate(Operation.ADD, operandOne, null);
}
else {
Object operandOne = leftOp.getValueInternal(state).getValue();
Object operandTwo = rightOp.getValueInternal(state).getValue();
if (operandOne instanceof Number && operandTwo instanceof Number) {
Number op1 = (Number) operandOne;
Number op2 = (Number) operandTwo;
if (op1 instanceof Double || op2 instanceof Double) {
return new TypedValue(op1.doubleValue() + op2.doubleValue());
} else if (op1 instanceof Long || op2 instanceof Long) {
return new TypedValue(op1.longValue() + op2.longValue());
} else { // TODO what about overflow?
return new TypedValue(op1.intValue() + op2.intValue());
}
} else if (operandOne instanceof String && operandTwo instanceof String) {
return new TypedValue(new StringBuilder((String) operandOne).append((String) operandTwo).toString());
} else if (operandOne instanceof String) {
StringBuilder result = new StringBuilder((String)operandOne);
result.append((operandTwo==null?"null":operandTwo.toString()));
return new TypedValue(result.toString());
} else if (operandTwo instanceof String) {
StringBuilder result = new StringBuilder((operandOne==null?"null":operandOne.toString()));
result.append((String)operandTwo);
return new TypedValue(result.toString());
}
return state.operate(Operation.ADD, operandOne, operandTwo);
}
}
@Override
public String toStringAST() {
if (children.length<2) { // unary plus
return new StringBuilder().append("+").append(getLeftOperand().toStringAST()).toString();
}
return super.toStringAST();
}
public SpelNodeImpl getRightOperand() {
if (children.length<2) {return null;}
return children[1];
}
}
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