001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.language.simple.ast;
018    
019    import java.util.ArrayList;
020    import java.util.List;
021    
022    import org.apache.camel.Expression;
023    import org.apache.camel.builder.ExpressionBuilder;
024    import org.apache.camel.language.simple.types.SimpleToken;
025    
026    /**
027     * A node which contains other {@link SimpleNode nodes}.
028     */
029    public class CompositeNodes extends BaseSimpleNode {
030    
031        private final List<SimpleNode> children = new ArrayList<SimpleNode>();
032    
033        public CompositeNodes(SimpleToken token) {
034            super(token);
035        }
036    
037        @Override
038        public String toString() {
039            StringBuilder sb = new StringBuilder();
040            for (SimpleNode child : children) {
041                sb.append(child.toString());
042            }
043            return sb.toString();
044        }
045    
046        public void addChild(SimpleNode child) {
047            children.add(child);
048        }
049    
050        public List<SimpleNode> getChildren() {
051            return children;
052        }
053    
054        @Override
055        public Expression createExpression(String expression) {
056            if (children.isEmpty()) {
057                return null;
058            } else if (children.size() == 1) {
059                return children.get(0).createExpression(expression);
060            } else {
061                List<Expression> answer = new ArrayList<Expression>();
062                for (SimpleNode child : children) {
063                    answer.add(child.createExpression(expression));
064                }
065                return ExpressionBuilder.concatExpression(answer);
066            }
067        }
068    
069    }