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Java > Open Source Codes > PlainDCH


1 /*
2  * @(#)PlainDCH.java 1.8 99/12/06
3  *
4  * Copyright 1997-1999 Sun Microsystems, Inc. All Rights Reserved.
5  *
6  * This software is the proprietary information of Sun Microsystems, Inc.
7  * Use is subject to license terms.
8  *
9  */
10 import java.io.*;
11 import java.awt.datatransfer.DataFlavor JavaDoc;
12 import javax.activation.*;
13
14
15 public class PlainDCH implements DataContentHandler {
16     /**
17      * return the DataFlavors for this <code>DataContentHandler</code>
18      * @return The DataFlavors.
19      */
20     public DataFlavor JavaDoc[] getTransferDataFlavors() { // throws Exception;
21 DataFlavor JavaDoc flavors[] = new DataFlavor JavaDoc[2];
22     
23
24     try {
25         flavors[0] = new ActivationDataFlavor(Class.forName("java.lang.String"),
26                        "text/plain",
27                        "text string");
28     } catch(Exception JavaDoc e)
29         { System.out.println(e); }
30
31     flavors[1] = new DataFlavor JavaDoc("text/plain", "Plain Text");
32     return flavors;
33     }
34     /**
35      * return the Transfer Data of type DataFlavor from InputStream
36      * @param df The DataFlavor.
37      * @param ins The InputStream corresponding to the data.
38      * @return The constructed Object.
39      */
40     public Object JavaDoc getTransferData(DataFlavor JavaDoc df, DataSource ds) {
41     
42     // this is sort of hacky, but will work for the
43 // sake of testing...
44 if(df.getMimeType().equals("text/plain")) {
45         if(df.getRepresentationClass().getName().equals(
46                            "java.lang.String")) {
47         // spit out String
48 StringBuffer JavaDoc buf = new StringBuffer JavaDoc();
49         char data[] = new char[1024];
50         // InputStream is = null;
51 InputStreamReader isr = null;
52         int bytes_read = 0;
53         int total_bytes = 0;
54
55         try {
56             isr = new InputStreamReader(ds.getInputStream());
57             
58 // while(is.read(data) > 0)
59 // buf.append(data);
60
61             while(true){
62             bytes_read = isr.read(data);
63             if(bytes_read > 0)
64                 buf.append(data, total_bytes, bytes_read);
65             else
66                 break;
67             total_bytes += bytes_read;
68             }
69         } catch(Exception JavaDoc e) {}
70
71         return buf.toString();
72         
73         }
74         else if(df.getRepresentationClass().getName().equals(
75                          "java.io.InputStream")){
76         // spit out InputStream
77 try {
78             return ds.getInputStream();
79         } catch (Exception JavaDoc e) {}
80         }
81         
82     }
83
84         return null;
85     }
86     
87     /**
88      *
89      */
90     public Object JavaDoc getContent(DataSource ds) { // throws Exception;
91 StringBuffer JavaDoc buf = new StringBuffer JavaDoc();
92     char data[] = new char[1024];
93     // InputStream is = null;
94 InputStreamReader isr = null;
95     int bytes_read = 0;
96     int total_bytes = 0;
97     
98     try {
99         isr = new InputStreamReader(ds.getInputStream());
100         
101         // while(is.read(data) > 0)
102 // buf.append(data);
103
104         while(true){
105         bytes_read = isr.read(data);
106         if(bytes_read > 0)
107             buf.append(data, total_bytes, bytes_read);
108         else
109             break;
110         total_bytes += bytes_read;
111         }
112     } catch(Exception JavaDoc e) {}
113     
114     return buf.toString();
115     }
116     /**
117      * construct an object from a byte stream
118      * (similar semantically to previous method, we are deciding
119      * which one to support)
120      */
121     public void writeTo(Object JavaDoc obj, String JavaDoc mimeTye, OutputStream os)
122     throws IOException {
123     // throws Exception;
124 }
125     
126 }
127
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