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.multipart; 016 017 import java.util.ArrayList; 018 import java.util.List; 019 020 /** 021 * A portion of a multipart request that stores a value, or values, for a parameter. 022 * 023 * @author Howard Lewis Ship 024 * @since 2.0.1 025 */ 026 027 public class ValuePart 028 { 029 private int _count; 030 031 // Stores either String or List of String 032 private Object _value; 033 034 public ValuePart(String value) 035 { 036 _count = 1; 037 _value = value; 038 } 039 040 public int getCount() 041 { 042 return _count; 043 } 044 045 /** 046 * Returns the value, or the first value (if multi-valued). 047 */ 048 049 public String getValue() 050 { 051 if (_count == 1) 052 return (String) _value; 053 054 List l = (List) _value; 055 056 return (String) l.get(0); 057 } 058 059 /** 060 * Returns the values as an array of strings. If there is only one value, it is returned wrapped 061 * as a single element array. 062 */ 063 064 public String[] getValues() 065 { 066 if (_count == 1) 067 return new String[] 068 { (String) _value }; 069 070 List l = (List) _value; 071 072 return (String[]) l.toArray(new String[_count]); 073 } 074 075 public void add(String newValue) 076 { 077 if (_count == 1) 078 { 079 List l = new ArrayList(); 080 l.add(_value); 081 l.add(newValue); 082 083 _value = l; 084 _count++; 085 return; 086 } 087 088 List l = (List) _value; 089 l.add(newValue); 090 _count++; 091 } 092 093 /** 094 * Does nothing. 095 */ 096 097 public void cleanup() 098 { 099 } 100 }