01: /*
02: * $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/httpcore/tags/4.0-beta1/module-main/src/main/java/org/apache/http/impl/io/IdentityInputStream.java $
03: * $Revision: 560358 $
04: * $Date: 2007-07-27 21:30:42 +0200 (Fri, 27 Jul 2007) $
05: *
06: * ====================================================================
07: * Licensed to the Apache Software Foundation (ASF) under one
08: * or more contributor license agreements. See the NOTICE file
09: * distributed with this work for additional information
10: * regarding copyright ownership. The ASF licenses this file
11: * to you under the Apache License, Version 2.0 (the
12: * "License"); you may not use this file except in compliance
13: * with the License. You may obtain a copy of the License at
14: *
15: * http://www.apache.org/licenses/LICENSE-2.0
16: *
17: * Unless required by applicable law or agreed to in writing,
18: * software distributed under the License is distributed on an
19: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
20: * KIND, either express or implied. See the License for the
21: * specific language governing permissions and limitations
22: * under the License.
23: * ====================================================================
24: *
25: * This software consists of voluntary contributions made by many
26: * individuals on behalf of the Apache Software Foundation. For more
27: * information on the Apache Software Foundation, please see
28: * <http://www.apache.org/>.
29: *
30: */
31:
32: package org.apache.http.impl.io;
33:
34: import java.io.IOException;
35: import java.io.InputStream;
36:
37: import org.apache.http.io.SessionInputBuffer;
38:
39: /**
40: * A stream for reading from a {@link SessionInputBuffer session input buffer}.
41: *
42: * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
43: *
44: * @version $Revision: 560358 $
45: *
46: * @since 4.0
47: */
48: public class IdentityInputStream extends InputStream {
49:
50: private final SessionInputBuffer in;
51:
52: private boolean closed = false;
53:
54: public IdentityInputStream(final SessionInputBuffer in) {
55: super ();
56: if (in == null) {
57: throw new IllegalArgumentException(
58: "Session input buffer may not be null");
59: }
60: this .in = in;
61: }
62:
63: public int available() throws IOException {
64: if (!this .closed && this .in.isDataAvailable(10)) {
65: return 1;
66: } else {
67: return 0;
68: }
69: }
70:
71: public void close() throws IOException {
72: this .closed = true;
73: }
74:
75: public int read() throws IOException {
76: if (this .closed) {
77: return -1;
78: } else {
79: return this .in.read();
80: }
81: }
82:
83: public int read(final byte[] b, int off, int len)
84: throws IOException {
85: if (this .closed) {
86: return -1;
87: } else {
88: return this.in.read(b, off, len);
89: }
90: }
91:
92: }
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