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Java > Open Source Codes > com > go > trove > classfile > SourceFileAttr


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52
53 package com.go.trove.classfile;
54
55 import java.io.*;
56
57 /******************************************************************************
58  * This class corresponds to the SourceFile_attribute structure as defined
59  * in section 4.7.2 of <i>The Java Virtual Machine Specification</i>.
60  *
61  * @author Brian S O'Neill
62  * @version
63  * <!--$$Revision:--> 24 <!-- $-->, <!--$$JustDate:--> 00/11/27 <!-- $-->
64  * @see ClassFile
65  */
66 class SourceFileAttr extends Attribute {
67     private String JavaDoc mFileName;
68
69     private ConstantUTFInfo mSourcefile;
70     
71     public SourceFileAttr(ConstantPool cp, String JavaDoc fileName) {
72         super(cp, SOURCE_FILE);
73         
74         mFileName = fileName;
75         mSourcefile = ConstantUTFInfo.make(cp, fileName);
76     }
77     
78     /**
79      * Returns the source file name.
80      */
81     public String JavaDoc getFileName() {
82         return mFileName;
83     }
84     
85     /**
86      * Returns a constant from the constant pool with the source file name.
87      */
88     public ConstantUTFInfo getFileNameConstant() {
89         return mSourcefile;
90     }
91
92     /**
93      * Returns the length of the source file attribute. (2 bytes)
94      */
95     public int getLength() {
96         return 2;
97     }
98     
99     public void writeDataTo(DataOutput dout) throws IOException {
100         dout.writeShort(mSourcefile.getIndex());
101     }
102
103     static Attribute define(ConstantPool cp,
104                             String JavaDoc name,
105                             int length,
106                             DataInput din) throws IOException {
107
108         int index = din.readUnsignedShort();
109         if ((length -= 2) > 0) {
110             din.skipBytes(length);
111         }
112
113         String JavaDoc filename = ((ConstantUTFInfo)cp.getConstant(index)).getValue();
114
115         return new SourceFileAttr(cp, filename);
116     }
117 }
118
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