001 /** 002 The contents of this file are subject to the Mozilla Public License Version 1.1 003 (the "License"); you may not use this file except in compliance with the License. 004 You may obtain a copy of the License at http://www.mozilla.org/MPL/ 005 Software distributed under the License is distributed on an "AS IS" basis, 006 WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the 007 specific language governing rights and limitations under the License. 008 009 The Original Code is "MinLLPWriter.java". Description: 010 "Title: MinLLPWriter 011 Description: Writes HL7 messages to an OutputStream 012 Copyright: Copyright (c) 2001 013 Company: University Health Network 014 @author Damian Horton 015 @version 1.1" 016 017 The Initial Developer of the Original Code is University Health Network. Copyright (C) 018 2001. All Rights Reserved. 019 020 Contributor(s): ______________________________________. 021 022 Alternatively, the contents of this file may be used under the terms of the 023 GNU General Public License (the ?GPL?), in which case the provisions of the GPL are 024 applicable instead of those above. If you wish to allow use of your version of this 025 file only under the terms of the GPL and not to allow others to use your version 026 of this file under the MPL, indicate your decision by deleting the provisions above 027 and replace them with the notice and other provisions required by the GPL License. 028 If you do not delete the provisions above, a recipient may use your version of 029 this file under either the MPL or the GPL. 030 031 */ 032 033 package ca.uhn.hl7v2.llp; 034 035 import java.io.*; 036 037 /** 038 * Title: MinLLPWriter 039 * Description: Writes HL7 messages to an OutputStream. The character set defaults to US-ASCII. 040 * It can be chaged by setting the system property ca.uhn.hl7v2.llp.charset to another value that 041 * is the name of a valid java.nio.charset.Charset. If this property is set to "default", then 042 * the system default is used. 043 * 044 * Copyright: Copyright (c) 2001 045 * Company: University Health Network 046 * @author Damian Horton; mods by Bryan Tripp 047 * @version 1.1 048 */ 049 050 public class MinLLPWriter implements HL7Writer 051 { 052 public static final String CHARSET_KEY = "ca.uhn.hl7v2.llp.charset"; 053 054 BufferedWriter myWriter; //reads from the input stream given in the 055 //constructor 056 boolean messageStarted = false; //whether or not the necessary characters to 057 //initialize the message have already been buffered 058 059 private OutputStream myOutputStream; 060 061 /** 062 * Creates a MinLLPWriter with no output stream specified - <code>setOutputStream</code> 063 * must be called before attempting to write any messages. 064 */ 065 public MinLLPWriter() { 066 } 067 068 /** 069 * Creates a MinLLPWriter, specifying the underlying output stream. 070 */ 071 public MinLLPWriter(OutputStream out) throws IOException { 072 setOutputStream(out); 073 } 074 075 /** 076 * Sets the underlying output stream to which messages are written. 077 */ 078 public synchronized void setOutputStream(OutputStream out) throws IOException 079 { 080 myOutputStream = out; 081 myWriter = new BufferedWriter(getWriter(out)); 082 } 083 084 /** 085 * Sends a complete message to the underlying output stream, delimited 086 * according to the minimal lower layer protocol. 087 */ 088 public synchronized void writeMessage(String message) throws LLPException, IOException 089 { 090 myWriter.write('\u000b'); 091 myWriter.write(message); 092 myWriter.write('\u001c' + "\r"); 093 myWriter.flush(); 094 } 095 096 /** 097 * Sends a complete message to the underlying output stream, delimited 098 * according to the minimal lower layer protocol, using the specified character set. 099 */ 100 public synchronized void writeMessage(String message, String charset) throws LLPException, IOException 101 { 102 BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(myOutputStream, charset)); 103 writer.write('\u000b'); 104 writer.write(message); 105 writer.write('\u001c' + "\r"); 106 writer.flush(); 107 } 108 109 public synchronized void close() throws java.io.IOException 110 { 111 myWriter.close(); 112 } 113 114 private static OutputStreamWriter getWriter(OutputStream theStream) throws IOException { 115 String charset = System.getProperty(CHARSET_KEY, "US-ASCII"); 116 117 if (charset.equals("default")) { 118 return new OutputStreamWriter(theStream); 119 } else { 120 return new OutputStreamWriter(theStream, charset); 121 } 122 } 123 124 }