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Java > Open Source Codes > edu > rice > cs > util > jar > ManifestWriter


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33
34 package edu.rice.cs.util.jar;
35
36 import edu.rice.cs.util.UnexpectedException;
37 import java.util.jar.Manifest JavaDoc;
38 import java.util.jar.Attributes JavaDoc;
39 import java.util.LinkedList JavaDoc;
40 import java.util.List JavaDoc;
41 import java.util.Iterator JavaDoc;
42 import java.io.*;
43
44 /**
45  * Writes manifest objects. Useful for creating Manifest files without writing them to files
46  */
47 public class ManifestWriter {
48   private List JavaDoc<String JavaDoc> _classPaths;
49   private String JavaDoc _mainClass;
50   public static final Manifest JavaDoc DEFAULT = new ManifestWriter().getManifest();
51
52   /** Create a new manifest file */
53   public ManifestWriter() {
54     _classPaths = new LinkedList JavaDoc<String JavaDoc>();
55     _mainClass = null;
56   }
57
58   /** Add a class path to the Manifest
59    * @param path the path to be added
60    */
61   public void addClassPath(String JavaDoc path) {
62     _classPaths.add(_classPaths.size(), path);
63   }
64
65   /**
66    * Set the main class of the Manifest
67    * @param mainClass
68    */
69   public void setMainClass(String JavaDoc mainClass) {
70     _mainClass = mainClass;
71   }
72
73   /**
74    * Get an input stream to the contents of the manifest file
75    * @return an InputStream whose contents are the contents of the Manifest file
76    */
77   protected InputStream getInputStream() {
78     // NOTE: All significant lines in the manifest MUST end in the end of line character
79
80     final StringBuilder JavaDoc sbuf = new StringBuilder JavaDoc();
81     sbuf.append(Attributes.Name.MANIFEST_VERSION.toString());
82     sbuf.append(": 1.0"+System.getProperty("line.separator"));
83     if( !_classPaths.isEmpty() ) {
84       Iterator JavaDoc<String JavaDoc> iter = _classPaths.iterator();
85       sbuf.append(Attributes.Name.CLASS_PATH.toString());
86       sbuf.append(":");
87       while (iter.hasNext()) {
88         sbuf.append(" ");
89         sbuf.append(iter.next());
90       }
91       sbuf.append(System.getProperty("line.separator"));
92     }
93     if( _mainClass != null ) {
94       sbuf.append(Attributes.Name.MAIN_CLASS.toString());
95       sbuf.append(": ");
96       sbuf.append(_mainClass);
97       sbuf.append(System.getProperty("line.separator"));
98     }
99     try {
100       return new ByteArrayInputStream(sbuf.toString().getBytes("UTF-8"));
101     }
102     catch (UnsupportedEncodingException e) {
103       throw new UnexpectedException(e);
104     }
105   }
106
107   /**
108    * Get the Manifest object that this object created.
109    * @return the Manifest that this builder created
110    */
111   public Manifest JavaDoc getManifest() {
112     try {
113       Manifest JavaDoc m = new Manifest JavaDoc();
114       m.read(getInputStream());
115       return m;
116     }
117     catch (IOException e) {
118       e.printStackTrace();
119       return null;
120     }
121   }
122 }
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