RAIFile


1   /*
2   Copyright (c) 2006, Matthew Estes
3   All rights reserved.
4   
5   Redistribution and use in source and binary forms, with or without
6   modification, are permitted provided that the following conditions are met:
7   
8       * Redistributions of source code must retain the above copyright
9   notice, this list of conditions and the following disclaimer.
10      * Redistributions in binary form must reproduce the above copyright
11  notice, this list of conditions and the following disclaimer in the
12  documentation and/or other materials provided with the distribution.
13      * Neither the name of Metanotion Software nor the names of its
14  contributors may be used to endorse or promote products derived from this
15  software without specific prior written permission.
16  
17  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
18  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
19  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
21  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
24  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
25  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
26  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29  package net.metanotion.io;
30  
31  import java.io.DataInput  ;
32  import java.io.DataOutput  ;
33  import java.io.File  ;
34  import java.io.FileNotFoundException  ;
35  import java.io.IOException  ;
36  import java.io.RandomAccessFile  ;
37  
38  public class RAIFile implements RandomAccessInterface, DataInput  , DataOutput   {
39      private File   f;
40      private RandomAccessFile   delegate;
41      private boolean r=false, w=false;
42  
43      public RAIFile(RandomAccessFile   file) throws FileNotFoundException   {
44          this.f = null;
45          this.delegate = file;
46      }
47  
48      public RAIFile(File   file, boolean read, boolean write) throws FileNotFoundException   {
49          this.f = file;
50          this.r = read;
51          this.w = write;
52          String   mode = "";
53          if(this.r) { mode += "r"; }
54          if(this.w) { mode += "w"; }
55          this.delegate = new RandomAccessFile  (file, mode);
56      }
57  
58      public long getFilePointer()        throws IOException   { return delegate.getFilePointer(); }
59      public long length()                throws IOException   { return delegate.length(); }
60      public int read()                   throws IOException   { return delegate.read(); }
61      public int read(byte[] b)           throws IOException   { return delegate.read(b); }
62      public int read(byte[] b, int off, int len) throws IOException   { return delegate.read(b,off,len); }
63      public void seek(long pos)          throws IOException   { delegate.seek(pos); }
64      public void setLength(long newLength) throws IOException   { delegate.setLength(newLength); }
65  
66      // Closeable Methods
67      // TODO May need to change.
68      public void close()                 throws IOException   { delegate.close(); }
69  
70      // DataInput Methods
71      public boolean readBoolean()        throws IOException   { return delegate.readBoolean(); }
72      public byte readByte()              throws IOException   { return delegate.readByte(); }
73      public char readChar()              throws IOException   { return delegate.readChar(); }
74      public double readDouble()          throws IOException   { return delegate.readDouble(); }
75      public float readFloat()            throws IOException   { return delegate.readFloat(); }
76      public void readFully(byte[] b)     throws IOException   { delegate.readFully(b); }
77      public void readFully(byte[] b, int off, int len) throws IOException   { delegate.readFully(b,off,len); }
78      public int readInt()                throws IOException   { return delegate.readInt(); }
79      public String   readLine()            throws IOException   { return delegate.readLine(); }
80      public long readLong()              throws IOException   { return delegate.readLong(); }
81      public short readShort()            throws IOException   { return delegate.readShort(); }
82      public int readUnsignedByte()       throws IOException   { return delegate.readUnsignedByte(); }
83      public int readUnsignedShort()      throws IOException   { return delegate.readUnsignedShort(); }
84  
85      /** Read a UTF encoded string
86          I would delegate here. But Java's read/writeUTF combo suck.
87          A signed 2 byte length is not enough.
88          This reads a 4 byte length.
89          The upper byte MUST be zero, if its not, then its not this method and has used an
90          extensible length encoding.
91          This is followed by the bytes of the UTF encoded string, as
92          returned by String.getBytes("UTF-8");
93      */
94      public String   readUTF()             throws IOException   {
95          int len = delegate.readInt();
96          if((len < 0) || (len >= 16777216)) { throw new IOException  ("Bad Length Encoding"); }
97          byte[] bytes = new byte[len];
98          int l = delegate.read(bytes);
99          if(l==-1) { throw new IOException  ("EOF while reading String"); }
100         String   s = new String  (bytes, "UTF-8");
101         return s;
102     }
103 
104     public int skipBytes(int n)         throws IOException   { return delegate.skipBytes(n); }
105 
106     // DataOutput Methods
107     public void write(int b)            throws IOException   { delegate.write(b); }
108     public void write(byte[] b)         throws IOException   { delegate.write(b); }
109     public void write(byte[] b, int off, int len) throws IOException   { delegate.write(b,off,len); }
110     public void writeBoolean(boolean v) throws IOException   { delegate.writeBoolean(v); }
111     public void writeByte(int v)        throws IOException   { delegate.writeByte(v); }
112     public void writeShort(int v)       throws IOException   { delegate.writeShort(v); }
113     public void writeChar(int v)        throws IOException   { delegate.writeChar(v); }
114     public void writeInt(int v)         throws IOException   {  delegate.writeInt(v); }
115     public void writeLong(long v)       throws IOException   {  delegate.writeLong(v); }
116     public void writeFloat(float v)     throws IOException   { delegate.writeFloat(v); }
117     public void writeDouble(double v)   throws IOException   { delegate.writeDouble(v); }
118     public void writeBytes(String   s)    throws IOException   { delegate.writeBytes(s); }
119     public void writeChars(String   s)    throws IOException   { delegate.writeChars(s); }
120 
121     /** Write a UTF encoded string
122         I would delegate here. But Java's read/writeUTF combo suck.
123         A signed 2 byte length is not enough.
124         This writes a 4 byte length.
125         The upper byte MUST be zero, if its not, then its not this method and has used an
126         extensible length encoding.
127         This is followed by the bytes of the UTF encoded string, as
128         returned by String.getBytes("UTF-8");
129     */
130     public void writeUTF(String   str)    throws IOException   {
131         byte[] string = str.getBytes("UTF-8");
132         if(string.length >= 16777216) { throw new IOException  ("String to long for encoding type"); }
133         delegate.writeInt(string.length);
134         delegate.write(string);
135     }
136 }
137
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