01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.commons.vfs.provider;
18:
19: import org.apache.commons.vfs.FileSystemException;
20:
21: import java.util.ArrayList;
22:
23: /**
24: * A {@link VfsComponent} that contains a set of sub-components.
25: *
26: * @author <a href="mailto:adammurdoch@apache.org">Adam Murdoch</a>
27: * @version $Revision: 480428 $ $Date: 2006-11-28 22:15:24 -0800 (Tue, 28 Nov 2006) $
28: */
29: public abstract class AbstractVfsContainer extends AbstractVfsComponent {
30: /**
31: * The components contained by this component.
32: */
33: private final ArrayList components = new ArrayList();
34:
35: /**
36: * Adds a sub-component to this component. If the sub-component implements
37: * {@link VfsComponent}, it is initialised. All sub-components are closed
38: * when this component is closed.
39: */
40: protected void addComponent(final Object component)
41: throws FileSystemException {
42: if (!components.contains(component)) {
43: // Initialise
44: if (component instanceof VfsComponent) {
45: VfsComponent vfsComponent = (VfsComponent) component;
46: vfsComponent.setLogger(getLogger());
47: vfsComponent.setContext(getContext());
48: vfsComponent.init();
49: }
50:
51: // Keep track of component, to close it later
52: components.add(component);
53: }
54: }
55:
56: /**
57: * Removes a sub-component from this component.
58: */
59: protected void removeComponent(final Object component) {
60: components.remove(component);
61: }
62:
63: /**
64: * Closes the sub-components of this component.
65: */
66: public void close() {
67: // Close all components
68: final int count = components.size();
69: for (int i = 0; i < count; i++) {
70: final Object component = components.get(i);
71: if (component instanceof VfsComponent) {
72: final VfsComponent vfsComponent = (VfsComponent) component;
73: vfsComponent.close();
74: }
75: }
76: components.clear();
77: }
78: }
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