1 /* 2 * Copyright (C) 2010 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package org.clearsilver; 18 19 import java.io.IOException; 20 21 /** 22 * Utility class that delegates all methods of an CS object. Made to 23 * facilitate the transition to CS being an interface and thus not 24 * extensible in the same way as it was. 25 * <p> 26 * This class, and its subclasses must take care to wrap or unwrap HDF and CS 27 * objects as they are passed through from the callers to the delegate object. 28 * 29 */ 30 public abstract class DelegatedCs implements CS { 31 private final CS cs; 32 33 public DelegatedCs(CS cs) { 34 // Give it an empty HDF. We aren't going to be using the super object anyways. 35 this.cs = cs; 36 } 37 38 public CS getCs() { 39 return cs; 40 } 41 42 /** 43 * Method subclasses are required to override with a method that returns a 44 * new DelegatedHdf object that wraps the specified HDF object. 45 * 46 * @param hdf an HDF object that should be wrapped in a new DelegatedHdf 47 * object of the same type as this current object. 48 * @return an object that is a subclass of DelegatedHdf and which wraps the 49 * given HDF object. 50 */ 51 protected abstract DelegatedHdf newDelegatedHdf(HDF hdf); 52 53 public void setGlobalHDF(HDF global) { 54 if (global != null && global instanceof DelegatedHdf) { 55 global = ((DelegatedHdf)global).getHdf(); 56 } 57 getCs().setGlobalHDF(global); 58 } 59 60 public HDF getGlobalHDF() { 61 HDF hdf = getCs().getGlobalHDF(); 62 return hdf != null ? newDelegatedHdf(hdf) : null; 63 } 64 65 public void close() { 66 getCs().close(); 67 } 68 69 public void parseFile(String filename) throws IOException { 70 getCs().parseFile(filename); 71 } 72 public void parseStr(String content) { 73 getCs().parseStr(content); 74 } 75 76 public String render() { 77 return getCs().render(); 78 } 79 80 public CSFileLoader getFileLoader() { 81 return getCs().getFileLoader(); 82 } 83 84 public void setFileLoader(CSFileLoader fileLoader) { 85 getCs().setFileLoader(fileLoader); 86 } 87 88 } 89
