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1
21 package com.jaspersoft.jasperserver.api.metadata.common.domain.util;
22
23 import java.io.ByteArrayOutputStream  ;
24 import java.io.IOException ;
25 import java.io.InputStream ;
26 import java.sql.Blob ;
27 import java.sql.SQLException ;
28
29 import org.apache.commons.logging.Log;
30 import org.apache.commons.logging.LogFactory;
31
32 import com.jaspersoft.jasperserver.api.JSException;
33 import com.jaspersoft.jasperserver.api.JSExceptionWrapper;
34 import com.jaspersoft.jasperserver.api.metadata.common.domain.FileResourceData;
35
36
40 public class StreamUtils {
41 private static final Log log = LogFactory.getLog(FileResourceData.class);
42 private static final int READ_STREAM_BUFFER_SIZE = 10000;
43
44 public static byte[] readData(InputStream is) {
45 if (is == null) {
46 return null;
47 }
48
49 ByteArrayOutputStream baos = new ByteArrayOutputStream ();
50
51 byte[] bytes = new byte[READ_STREAM_BUFFER_SIZE];
52 int ln = 0;
53 try {
54 while ((ln = is.read(bytes)) > 0) {
55 baos.write(bytes, 0, ln);
56 }
57 } catch (IOException e) {
58 log.error("Error while reading data.", e);
59 throw new JSExceptionWrapper(e);
60 }
61
62 return baos.toByteArray();
63 }
64
65 public static byte[] readData(InputStream is, int size) {
66 if (is == null) {
67 return null;
68 }
69
70 try {
71 byte[] data = new byte[size];
72 int offset = 0;
73 while (size > 0) {
74 int read = is.read(data, offset, size);
75 if (read < 0) {
76 throw new JSException("Input stream exhausted before reading " + size + " bytes");
77 }
78 offset += read;
79 size -= read;
80 }
81 return data;
82 } catch (IOException e) {
83 log.error("Error while reading data.", e);
84 throw new JSExceptionWrapper(e);
85 }
86 }
87
88 public static byte[] readData(Blob blob) {
89 if (blob == null) {
90 return null;
91 }
92
93 try {
94 return readData(blob.getBinaryStream());
95 } catch (SQLException e) {
96 log.error("Error while reading blob data", e);
97 throw new JSExceptionWrapper(e);
98 }
99 }
100
101 }
102 |
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