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 */
017package org.apache.camel.language.simple.ast;
018
019import java.util.ArrayList;
020import java.util.List;
021
022import org.apache.camel.Expression;
023import org.apache.camel.builder.ExpressionBuilder;
024import org.apache.camel.language.simple.types.SimpleToken;
025
026/**
027 * A node which contains other {@link SimpleNode nodes}.
028 */
029public class CompositeNodes extends BaseSimpleNode {
030
031    private final List<SimpleNode> children = new ArrayList<>();
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<>();
062            for (SimpleNode child : children) {
063                answer.add(child.createExpression(expression));
064            }
065            return ExpressionBuilder.concatExpression(answer);
066        }
067    }
068
069}