001/**
002The 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. 
004You may obtain a copy of the License at http://www.mozilla.org/MPL/ 
005Software distributed under the License is distributed on an "AS IS" basis, 
006WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the 
007specific language governing rights and limitations under the License. 
008
009The Original Code is "MinLowerLayerProtocol.java".  Description: 
010"Implements the "Minimal Lower Layer Protocol" from the HL7 Implementation 
011  Guide, Appendix C" 
012
013The Initial Developer of the Original Code is University Health Network. Copyright (C) 
0142001.  All Rights Reserved. 
015
016Contributor(s): ______________________________________. 
017
018Alternatively, the contents of this file may be used under the terms of the 
019GNU General Public License (the "GPL"), in which case the provisions of the GPL are 
020applicable instead of those above.  If you wish to allow use of your version of this 
021file only under the terms of the GPL and not to allow others to use your version 
022of this file under the MPL, indicate your decision by deleting  the provisions above 
023and replace  them with the notice and other provisions required by the GPL License.  
024If you do not delete the provisions above, a recipient may use your version of 
025this file under either the MPL or the GPL. 
026
027*/
028
029package ca.uhn.hl7v2.llp;
030
031import java.io.*;
032import java.nio.charset.Charset;
033
034/**
035 * Implements the "Minimal Lower Layer Protocol" from the HL7 Implementation 
036 * Guide, Appendix C.  In other words, provides a reader and a writer that can be 
037 * used to communicate with a server that uses the minimal LLP.
038 * 
039 * @see MinLLPReader
040 * @see MinLLPWriter 
041 * @author Bryan Tripp
042 */
043public class MinLowerLayerProtocol extends LowerLayerProtocol {
044
045        private Charset charset;
046
047    /** 
048     * Creates new MinLowerLayerProtocol 
049     */
050    public MinLowerLayerProtocol() {
051    }
052    
053    /**
054     * Creates an HL7Reader that implements message reading according to 
055     * this protocol.  
056     */
057    public HL7Reader getReader(InputStream in) throws LLPException {
058        try {
059                if (charset != null) {
060                        return new MinLLPReader(in, charset);
061                } else {
062                        return new MinLLPReader(in);
063                }
064        } catch (IOException e) {
065            throw new LLPException("Can't create MinLLPReader with the given input stream: " + e.getMessage(), e);
066        }
067    }
068    
069    /**
070     * Creates an HL7Writer that implements message writing according to 
071     * this protocol.  
072     */
073    public HL7Writer getWriter(OutputStream out) throws LLPException {
074        try {
075                if (charset != null) {
076                        return new MinLLPWriter(out, charset);
077                } else {
078                        return new MinLLPWriter(out);
079                }
080        } catch (IOException e) {
081            throw new LLPException("Can't create MinLLPWriter with the given output stream: " + e.getMessage(), e);
082        }
083    }
084    
085    /**
086     * Provides a charset to use for character encoding
087     * @param theCharset The charset to use
088     * @since 1.3
089     */
090        public void setCharset(Charset theCharset) {
091                charset = theCharset;
092        }
093
094    /**
095     * Provides a charset to use for character encoding
096     * @param charsetName The name of the charset to use
097     * @since 2.1
098     */
099        public void setCharset(String charsetName) {
100                charset = Charset.forName(charsetName);
101        }
102
103}