001 /** 002 * =========================================================== 003 * LibRepository : a free Java content repository access layer 004 * =========================================================== 005 * 006 * Project Info: http://jfreereport.pentaho.org/librepository/ 007 * 008 * (C) Copyright 2006, by Pentaho Corporation and Contributors. 009 * 010 * This library is free software; you can redistribute it and/or modify it under the terms 011 * of the GNU Lesser General Public License as published by the Free Software Foundation; 012 * either version 2.1 of the License, or (at your option) any later version. 013 * 014 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 015 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 016 * See the GNU Lesser General Public License for more details. 017 * 018 * You should have received a copy of the GNU Lesser General Public License along with this 019 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, 020 * Boston, MA 02111-1307, USA. 021 * 022 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 023 * in the United States and other countries.] 024 * 025 * ------------ 026 * DefaultNameGenerator.java 027 * ------------ 028 * (C) Copyright 2006, by Pentaho Corporation. 029 */ 030 031 package org.jfree.repository; 032 033 public class DefaultNameGenerator implements NameGenerator 034 { 035 private ContentLocation location; 036 private String defaultNameHint; 037 private String defaultSuffix; 038 039 public DefaultNameGenerator(final ContentLocation location) 040 { 041 this(location, "file", null); 042 } 043 044 public DefaultNameGenerator(final ContentLocation location, 045 final String defaultNameHint) 046 { 047 if (location == null) 048 { 049 throw new NullPointerException(); 050 } 051 if (defaultNameHint == null) 052 { 053 throw new NullPointerException(); 054 } 055 056 this.location = location; 057 058 // a leading point is not a sufix! 059 final int pos = defaultNameHint.lastIndexOf('.'); 060 if (defaultSuffix == null && pos > 0) 061 { 062 if (pos < (defaultNameHint.length() - 1)) 063 { 064 this.defaultNameHint = defaultNameHint.substring(0, pos - 1); 065 this.defaultSuffix = defaultNameHint.substring(pos + 1); 066 } 067 else 068 { 069 this.defaultNameHint = defaultNameHint.substring(0, pos - 1); 070 this.defaultSuffix = null; 071 } 072 } 073 else 074 { 075 this.defaultNameHint = defaultNameHint; 076 this.defaultSuffix = null; 077 } 078 } 079 080 public DefaultNameGenerator(final ContentLocation location, 081 final String defaultNameHint, 082 final String defaultSuffix) 083 { 084 if (location == null) 085 { 086 throw new NullPointerException(); 087 } 088 if (defaultNameHint == null) 089 { 090 throw new NullPointerException(); 091 } 092 093 this.location = location; 094 this.defaultNameHint = defaultNameHint; 095 this.defaultSuffix = defaultSuffix; 096 } 097 098 /** 099 * Generates a new, unique name for storing resources in the output 100 * repository. Assuming that proper synchronization has been applied, the 101 * generated name will be unique within that repository. 102 * 103 * @param nameHint a user defined name for that resource. 104 * @param mimeType the mime type of the resource to be stored in the 105 * repository. 106 * @return the generated, fully qualified name. 107 */ 108 public String generateName(final String nameHint, final String mimeType) 109 throws ContentIOException 110 { 111 final String name; 112 if (nameHint != null) 113 { 114 name = nameHint; 115 } 116 else 117 { 118 name = defaultNameHint; 119 } 120 121 final String suffix; 122 if (defaultSuffix != null) 123 { 124 suffix = defaultSuffix; 125 } 126 else 127 { 128 suffix = getSuffixForType(mimeType, location); 129 } 130 131 final String firstFileName = name + "." + suffix; 132 if (location.exists(firstFileName) == false) 133 { 134 return firstFileName; 135 } 136 int counter = 0; 137 while (true) 138 { 139 if (counter < 0) // wraparound should not happen.. 140 { 141 throw new ContentIOException(); 142 } 143 144 final String filename = name + counter + "." + suffix; 145 if (location.exists(filename) == false) 146 { 147 return filename; 148 } 149 counter += 1; 150 } 151 } 152 153 private String getSuffixForType(final String mimeType, 154 final ContentLocation location) 155 { 156 final Repository repository = location.getRepository(); 157 final MimeRegistry mimeRegistry = repository.getMimeRegistry(); 158 return mimeRegistry.getSuffix(mimeType); 159 } 160 }