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/*
* Copyright 2002-2010 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.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.expression.EvaluationException;
import org.springframework.expression.TypedValue;
import org.springframework.expression.spel.ExpressionState;
import org.springframework.expression.spel.SpelEvaluationException;
import org.springframework.expression.spel.SpelMessage;
import org.springframework.util.ClassUtils;
import org.springframework.util.ObjectUtils;
/**
* Represents projection, where a given operation is performed on all elements in some input sequence, returning
* a new sequence of the same size. For example:
* "{1,2,3,4,5,6,7,8,9,10}.!{#isEven(#this)}" returns "[n, y, n, y, n, y, n, y, n, y]"
*
* @author Andy Clement
* @author Mark Fisher
* @since 3.0
*/
public class Projection extends SpelNodeImpl {
private final boolean nullSafe;
public Projection(boolean nullSafe, int pos, SpelNodeImpl expression) {
super(pos, expression);
this.nullSafe = nullSafe;
}
@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
TypedValue op = state.getActiveContextObject();
Object operand = op.getValue();
boolean operandIsArray = ObjectUtils.isArray(operand);
// TypeDescriptor operandTypeDescriptor = op.getTypeDescriptor();
// When the input is a map, we push a special context object on the stack
// before calling the specified operation. This special context object
// has two fields 'key' and 'value' that refer to the map entries key
// and value, and they can be referenced in the operation
// eg. {'a':'y','b':'n'}.!{value=='y'?key:null}" == ['a', null]
if (operand instanceof Map) {
Map mapData = (Map) operand;
List