001/* StreamPrintServiceFactory.java -- 002 Copyright (C) 2006 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package javax.print; 040 041import gnu.classpath.ServiceFactory; 042 043import java.io.OutputStream; 044import java.util.Arrays; 045import java.util.HashSet; 046import java.util.Iterator; 047 048/** 049 * <code>StreamPrintServiceFactory</code> provides a static method to lookup 050 * registered factories to construct <code>StreamPrintService</code> instances. 051 * <p> 052 * <code>StreamPrintService</code> are used to print into a provided output 053 * stream in the document format provided by the stream print service 054 * implementation. 055 * </p><p> 056 * Implementations are located and loaded automatically through the SPI JAR 057 * file specification. Therefore implementation classes must provide a default 058 * constructor for instantiation. 059 * </p> 060 * 061 * @author Wolfgang Baer (WBaer@gmx.de) 062 */ 063public abstract class StreamPrintServiceFactory 064{ 065 /** 066 * Default public constructor. 067 * Used for automatic loading and instantiation through 068 * the SPI jar file specification. 069 */ 070 public StreamPrintServiceFactory() 071 { 072 // nothing to do 073 } 074 075 /** 076 * Searches for matching factories providing stream print services that 077 * support the printing of documents with the given document flavor into 078 * the given output mime type. 079 * 080 * @param flavor the document flavor needed, <code>null</code> doesn't 081 * constrain the lookup result. 082 * @param outputMimeType the mime type needed, <code>null</code> doesn't 083 * constrain the lookup result. 084 * 085 * @return The matching <code>StreamPrintServiceFactory</code> instances. 086 */ 087 public static StreamPrintServiceFactory[] lookupStreamPrintServiceFactories( 088 DocFlavor flavor, String outputMimeType) 089 { 090 HashSet set = new HashSet(); 091 092 Iterator it = 093 ServiceFactory.lookupProviders(StreamPrintServiceFactory.class); 094 095 while (it.hasNext()) 096 { 097 StreamPrintServiceFactory tmp = (StreamPrintServiceFactory) it.next(); 098 if (tmp.getOutputFormat().equals(outputMimeType) 099 && Arrays.asList(tmp.getSupportedDocFlavors()).contains(flavor)) 100 set.add(tmp); 101 } 102 103 StreamPrintServiceFactory[] tmp = new StreamPrintServiceFactory[set.size()]; 104 return (StreamPrintServiceFactory[]) set.toArray(tmp); 105 } 106 107 /** 108 * Returns the output format supported by this factory. 109 * 110 * @return The mime type of the output format as string representation. 111 */ 112 public abstract String getOutputFormat(); 113 114 /** 115 * Returns the document flavors this factory supports as flavors 116 * for the input documents. 117 * 118 * @return The array of supported document flavors. 119 */ 120 public abstract DocFlavor[] getSupportedDocFlavors(); 121 122 /** 123 * Constructs a <code>StreamPrintService</code> which directs its output 124 * the given output stream. 125 * 126 * @param out the output stream for the produced document. 127 * @return The constructed stream print service. 128 */ 129 public abstract StreamPrintService getPrintService(OutputStream out); 130}