001 /* SimpleDoc.java -- 002 Copyright (C) 2006 Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 039 package javax.print; 040 041 import java.io.ByteArrayInputStream; 042 import java.io.CharArrayReader; 043 import java.io.IOException; 044 import java.io.InputStream; 045 import java.io.Reader; 046 import java.io.StringReader; 047 048 import javax.print.attribute.AttributeSetUtilities; 049 import javax.print.attribute.DocAttributeSet; 050 051 /** 052 * Simple implementation of the <code>Doc</code> interface capable of handling 053 * the predefined document flavors of <code>DocFlavor</code>. 054 * <p> 055 * This implementation can construct a reader or stream for the service from 056 * the print data and ensures that always the same object is returned on each 057 * method call. It does simple checks that the supplied data matches the 058 * specified flavor of the doc object and supports thread safe access. 059 * </p> 060 * 061 * @author Wolfgang Baer (WBaer@gmx.de) 062 */ 063 public final class SimpleDoc implements Doc 064 { 065 private final Object printData; 066 private final DocFlavor flavor; 067 private final DocAttributeSet attributes; 068 069 private InputStream stream; 070 private Reader reader; 071 072 /** 073 * Constructs a SimpleDoc with the specified print data, doc flavor and doc attribute set. 074 * @param printData the object with the data to print. 075 * @param flavor the document flavor of the print data. 076 * @param attributes the attributes of the doc (may be <code>null</code>). 077 * 078 * @throws IllegalArgumentException if either <code>printData</code> or 079 * <code>flavor</code> are <code>null</code>, or the print data is not 080 * supplied in the document format specified by the given flavor object. 081 */ 082 public SimpleDoc(Object printData, DocFlavor flavor, 083 DocAttributeSet attributes) 084 { 085 if (printData == null || flavor == null) 086 throw new IllegalArgumentException("printData/flavor may not be null"); 087 088 if (! (printData.getClass().getName().equals( 089 flavor.getRepresentationClassName()) 090 || flavor.getRepresentationClassName().equals("java.io.Reader") 091 && printData instanceof Reader 092 || flavor.getRepresentationClassName().equals("java.io.InputStream") 093 && printData instanceof InputStream)) 094 { 095 throw new IllegalArgumentException("data is not of declared flavor type"); 096 } 097 098 this.printData = printData; 099 this.flavor = flavor; 100 101 if (attributes != null) 102 this.attributes = AttributeSetUtilities.unmodifiableView(attributes); 103 else 104 this.attributes = null; 105 106 stream = null; 107 reader = null; 108 } 109 110 /** 111 * Returns the unmodifiable view of the attributes of this doc object. 112 * <p> 113 * The attributes of this doc's attributes set overrides attributes of 114 * the same category in the print job's attribute set. If an attribute 115 * is not available in this doc's attributes set or <code>null</code> 116 * is returned the attributes of the same category of the print job are 117 * used. 118 * </p> 119 * 120 * @return The unmodifiable attributes set, or <code>null</code>. 121 */ 122 public DocAttributeSet getAttributes() 123 { 124 return attributes; 125 } 126 127 /** 128 * Returns the flavor of this doc objects print data. 129 * 130 * @return The document flavor. 131 */ 132 public DocFlavor getDocFlavor() 133 { 134 return flavor; 135 } 136 137 /** 138 * Returns the print data of this doc object. 139 * <p> 140 * The returned object is an instance as described by the associated 141 * document flavor ({@link DocFlavor#getRepresentationClassName()}) 142 * and can be cast to this representation class. 143 * </p> 144 * 145 * @return The print data in the representation class. 146 * @throws IOException if representation class is a stream and I/O 147 * exception occures. 148 */ 149 public Object getPrintData() throws IOException 150 { 151 return printData; 152 } 153 154 /** 155 * Returns a <code>Reader</code> object for extracting character print data 156 * from this document. 157 * <p> 158 * This method is supported if the document flavor is of type: 159 * <ul> 160 * <li><code>char[]</code></li> 161 * <li><code>java.lang.String</code></li> 162 * <li><code>java.io.Reader</code></li> 163 * </ul> 164 * otherwise this method returns <code>null</code>. 165 * </p> 166 * 167 * @return The <code>Reader</code> object, or <code>null</code>. 168 * 169 * @throws IOException if an error occurs. 170 */ 171 public Reader getReaderForText() throws IOException 172 { 173 synchronized (this) 174 { 175 // construct the reader if applicable on request 176 if (reader == null) 177 { 178 if (flavor instanceof DocFlavor.CHAR_ARRAY) 179 reader = new CharArrayReader((char[]) printData); 180 else if (flavor instanceof DocFlavor.STRING) 181 reader = new StringReader((String) printData); 182 else if (flavor instanceof DocFlavor.READER) 183 reader = (Reader) printData; 184 } 185 186 return reader; 187 } 188 } 189 190 /** 191 * Returns an <code>InputStream</code> object for extracting byte print data 192 * from this document. 193 * <p> 194 * This method is supported if the document flavor is of type: 195 * <ul> 196 * <li><code>byte[]</code></li> 197 * <li><code>java.io.InputStream</code></li> 198 * </ul> 199 * otherwise this method returns <code>null</code>. 200 * </p> 201 * 202 * @return The <code>InputStream</code> object, or <code>null</code>. 203 * 204 * @throws IOException if an error occurs. 205 */ 206 public InputStream getStreamForBytes() throws IOException 207 { 208 synchronized (this) 209 { 210 // construct the stream if applicable on request 211 if (stream == null) 212 { 213 if (flavor instanceof DocFlavor.BYTE_ARRAY) 214 stream = new ByteArrayInputStream((byte[]) printData); 215 else if (flavor instanceof DocFlavor.INPUT_STREAM) 216 stream = (InputStream) printData; 217 } 218 219 return stream; 220 } 221 } 222 223 }