001 // Copyright 2004, 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.tapestry.util.io; 016 017 import org.apache.tapestry.services.DataSqueezer; 018 019 /** 020 * Squeezes a String (which is pretty simple, most of the time). 021 * 022 * @author Howard Lewis Ship 023 */ 024 025 public class StringAdaptor implements SqueezeAdaptor 026 { 027 private static final String PREFIX = "S"; 028 029 public String getPrefix() 030 { 031 return PREFIX; 032 } 033 034 public Class getDataClass() 035 { 036 return String.class; 037 } 038 039 public String squeeze(DataSqueezer squeezer, Object data) 040 { 041 String string = (String) data; 042 043 return PREFIX + string; 044 } 045 046 /** 047 * Strips the prefix from the string. This method is only invoked by the 048 * {@link DataSqueezerImpl} if the string leads with its normal prefix (an 'S'). 049 */ 050 051 public Object unsqueeze(DataSqueezer squeezer, String string) 052 { 053 if (string.length() == 1) 054 return ""; 055 056 return string.substring(1); 057 } 058 }