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.attachment;
19:
20: import java.io.IOException;
21: import java.io.InputStream;
22: import java.io.OutputStream;
23: import java.util.Collection;
24:
25: import javax.activation.DataSource;
26:
27: import org.apache.cxf.message.Attachment;
28:
29: /**
30: * A DataSource which will search through a Collection of attachments so as to
31: * lazily load the attachment from the collection. This allows streaming attachments
32: * with databinding toolkits like JAXB.
33: */
34: public class LazyDataSource implements DataSource {
35: private DataSource dataSource;
36: private Collection<Attachment> attachments;
37: private String id;
38:
39: public LazyDataSource(String id, Collection<Attachment> attachments) {
40: super ();
41: this .id = id;
42: this .attachments = attachments;
43: }
44:
45: private synchronized void load() {
46: if (dataSource == null) {
47: for (Attachment a : attachments) {
48: if (a.getId().equals(id)) {
49: this .dataSource = a.getDataHandler()
50: .getDataSource();
51: break;
52: }
53: }
54: }
55: }
56:
57: public String getContentType() {
58: load();
59:
60: return dataSource.getContentType();
61: }
62:
63: public InputStream getInputStream() throws IOException {
64: load();
65:
66: return dataSource.getInputStream();
67: }
68:
69: public String getName() {
70: load();
71:
72: return dataSource.getName();
73: }
74:
75: public OutputStream getOutputStream() throws IOException {
76: load();
77:
78: return dataSource.getOutputStream();
79: }
80:
81: public DataSource getDataSource() {
82: return dataSource;
83: }
84:
85: public void setDataSource(DataSource dataSource) {
86: this.dataSource = dataSource;
87: }
88: }
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