001 /* Doc.java -- 002 Copyright (C) 2004, 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.IOException; 042 import java.io.InputStream; 043 import java.io.Reader; 044 045 import javax.print.attribute.DocAttributeSet; 046 047 /** 048 * <code>Doc</code> specifies the interface for print services how to obtain 049 * the print data and document specific attributes for printing. 050 * <p> 051 * The print data is always passed to a {@link javax.print.DocPrintJob} object 052 * as a <code>Doc</code> object which allows the print services to: 053 * <ul> 054 * <li>Determine the actual document format of the supplied print data. This 055 * is supplied as a {@link javax.print.DocFlavor} object with the MIME type 056 * and the representation class of the print data.</li> 057 * <li>Obtain the print data either in its representation class or depending 058 * on the document format through convenience methods as a 059 * {@link java.io.Reader} or an {@link java.io.InputStream}.</li> 060 * <li>Obtain the document's attribute set specifying the attributes which 061 * apply to this document instance.</li> 062 * </ul> 063 * </p><p> 064 * Every method of a <code>Doc</code> implementation has to return always the 065 * same object on every method call. Therefore if the print job consumes the 066 * print data via a stream or a reader object it can read only once the 067 * supplied print data. Implementations of this interface have to be thread 068 * safe. 069 * </p> 070 * 071 * @author Michael Koch (konqueror@gmx.de) 072 */ 073 public interface Doc 074 { 075 /** 076 * Returns the unmodifiable view of the attributes of this doc object. 077 * <p> 078 * The attributes of this doc's attributes set overrides attributes of 079 * the same category in the print job's attribute set. If an attribute 080 * is not available in this doc's attributes set or <code>null</code> 081 * is returned the attributes of the same category of the print job are 082 * used. 083 * </p> 084 * 085 * @return The unmodifiable attributes set, or <code>null</code>. 086 */ 087 DocAttributeSet getAttributes(); 088 089 /** 090 * Returns the flavor of this doc objects print data. 091 * 092 * @return The document flavor. 093 */ 094 DocFlavor getDocFlavor(); 095 096 /** 097 * Returns the print data of this doc object. 098 * <p> 099 * The returned object is an instance as described by the associated 100 * document flavor ({@link DocFlavor#getRepresentationClassName()}) 101 * and can be cast to this representation class. 102 * </p> 103 * 104 * @return The print data in the representation class. 105 * @throws IOException if representation class is a stream and I/O 106 * exception occures. 107 */ 108 Object getPrintData() throws IOException; 109 110 /** 111 * Returns a <code>Reader</code> object for extracting character print data 112 * from this document. 113 * <p> 114 * This method is supported if the document flavor is of type: 115 * <ul> 116 * <li><code>char[]</code></li> 117 * <li><code>java.lang.String</code></li> 118 * <li><code>java.io.Reader</code></li> 119 * </ul> 120 * otherwise this method returns <code>null</code>. 121 * </p> 122 * 123 * @return The <code>Reader</code> object, or <code>null</code>. 124 * 125 * @throws IOException if an error occurs. 126 */ 127 Reader getReaderForText() throws IOException; 128 129 /** 130 * Returns an <code>InputStream</code> object for extracting byte print data 131 * from this document. 132 * <p> 133 * This method is supported if the document flavor is of type: 134 * <ul> 135 * <li><code>byte[]</code></li> 136 * <li><code>java.io.InputStream</code></li> 137 * </ul> 138 * otherwise this method returns <code>null</code>. 139 * </p> 140 * 141 * @return The <code>InputStream</code> object, or <code>null</code>. 142 * 143 * @throws IOException if an error occurs. 144 */ 145 InputStream getStreamForBytes() throws IOException; 146 }