01: /**
02: * Licensed to the Apache Software Foundation (ASF) under one
03: * or more contributor license agreements. See the NOTICE file
04: * distributed with this work for additional information
05: * regarding copyright ownership. The ASF licenses this file
06: * to you under the Apache License, Version 2.0 (the
07: * "License"); you may not use this file except in compliance
08: * with the License. You may obtain a copy of the License at
09: *
10: * http://www.apache.org/licenses/LICENSE-2.0
11: *
12: * Unless required by applicable law or agreed to in writing,
13: * software distributed under the License is distributed on an
14: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15: * KIND, either express or implied. See the License for the
16: * specific language governing permissions and limitations
17: * under the License.
18: */package org.apache.cxf.io;
19:
20: import java.io.IOException;
21: import java.io.OutputStream;
22:
23: /**
24: * Provides a convenient hook onFirstWrite() for those needing
25: * to wrap an output stream.
26: *
27: */
28: public abstract class AbstractWrappedOutputStream extends OutputStream {
29:
30: protected OutputStream wrappedStream;
31: protected boolean written;
32:
33: protected AbstractWrappedOutputStream() {
34: super ();
35: }
36:
37: @Override
38: public void write(byte[] b, int off, int len) throws IOException {
39: if (!written) {
40: onFirstWrite();
41: written = true;
42: }
43: wrappedStream.write(b, off, len);
44: }
45:
46: protected void onFirstWrite() throws IOException {
47: }
48:
49: @Override
50: public void write(byte[] b) throws IOException {
51: if (!written) {
52: onFirstWrite();
53: written = true;
54: }
55: wrappedStream.write(b);
56: }
57:
58: @Override
59: public void write(int b) throws IOException {
60: if (!written) {
61: onFirstWrite();
62: written = true;
63: }
64: wrappedStream.write(b);
65: }
66:
67: @Override
68: public void close() throws IOException {
69: if (wrappedStream != null) {
70: wrappedStream.close();
71: }
72: }
73:
74: @Override
75: public void flush() throws IOException {
76: if (written) {
77: wrappedStream.flush();
78: }
79: }
80: }
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