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 org.apache.camel.Expression; 020import org.apache.camel.builder.ExpressionBuilder; 021import org.apache.camel.language.simple.types.SimpleToken; 022 023/** 024 * Starts a block enclosed by double quotes 025 */ 026public class DoubleQuoteStart extends BaseSimpleNode implements BlockStart { 027 028 private final CompositeNodes block; 029 030 public DoubleQuoteStart(SimpleToken token) { 031 super(token); 032 this.block = new CompositeNodes(token); 033 } 034 035 @Override 036 public String toString() { 037 // output a nice toString so it makes debugging easier as we can see the entire block 038 return "\"" + block + "\""; 039 } 040 041 @Override 042 public Expression createExpression(String expression) { 043 Expression answer = null; 044 if (block != null) { 045 answer = block.createExpression(expression); 046 } 047 if (answer == null) { 048 // there quoted literal is empty 049 answer = ExpressionBuilder.constantExpression(""); 050 } 051 return answer; 052 } 053 054 @Override 055 public boolean acceptAndAddNode(SimpleNode node) { 056 block.addChild(node); 057 return true; 058 } 059 060}