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 015package org.apache.tapestry.util.io; 016 017import 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 025public 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}