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; 016 017 import java.util.ArrayList; 018 import java.util.Collections; 019 import java.util.HashMap; 020 import java.util.List; 021 import java.util.Map; 022 023 /** 024 * Base class implementation for the {@link IPropertyHolder} interface. 025 * 026 * 027 * @author Howard Lewis Ship 028 * 029 **/ 030 031 public class BasePropertyHolder implements IPropertyHolder 032 { 033 private static final int MAP_SIZE = 7; 034 private Map properties; 035 036 public String getProperty(String name) 037 { 038 if (properties == null) 039 return null; 040 041 return (String) properties.get(name); 042 } 043 044 public void setProperty(String name, String value) 045 { 046 if (value == null) 047 { 048 removeProperty(name); 049 return; 050 } 051 052 if (properties == null) 053 properties = new HashMap(MAP_SIZE); 054 055 properties.put(name, value); 056 } 057 058 public void removeProperty(String name) 059 { 060 if (properties == null) 061 return; 062 063 properties.remove(name); 064 } 065 066 public List getPropertyNames() 067 { 068 if (properties == null) 069 return Collections.EMPTY_LIST; 070 071 List result = new ArrayList(properties.keySet()); 072 073 Collections.sort(result); 074 075 return result; 076 } 077 078 }