01: /*
02: * Copyright (c) 2007, intarsys consulting GmbH
03: *
04: * Redistribution and use in source and binary forms, with or without
05: * modification, are permitted provided that the following conditions are met:
06: *
07: * - Redistributions of source code must retain the above copyright notice,
08: * this list of conditions and the following disclaimer.
09: *
10: * - Redistributions in binary form must reproduce the above copyright notice,
11: * this list of conditions and the following disclaimer in the documentation
12: * and/or other materials provided with the distribution.
13: *
14: * - Neither the name of intarsys nor the names of its contributors may be used
15: * to endorse or promote products derived from this software without specific
16: * prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21: * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28: * POSSIBILITY OF SUCH DAMAGE.
29: */
30: package de.intarsys.tools.attribute;
31:
32: import java.util.HashMap;
33: import java.util.Map;
34:
35: /**
36: * A common implementation of IAttributeSupport for quick linking in a host
37: * object.
38: * <p>
39: * This is not thread safe.
40: */
41: public class AttributeSupport implements IAttributeSupport {
42: private Map attributes;
43:
44: /*
45: * (non-Javadoc)
46: *
47: * @see de.intarsys.tools.attribute.IAttributeSupport#getAttribute(java.lang.Object)
48: */
49: synchronized public Object getAttribute(Object key) {
50: if (attributes == null) {
51: return null;
52: }
53: return attributes.get(key);
54: }
55:
56: /*
57: * (non-Javadoc)
58: *
59: * @see de.intarsys.tools.attribute.IAttributeSupport#removeAttribute(java.lang.Object)
60: */
61: synchronized public Object removeAttribute(Object key) {
62: if (attributes == null) {
63: return null;
64: }
65: return attributes.remove(key);
66: }
67:
68: /*
69: * (non-Javadoc)
70: *
71: * @see de.intarsys.tools.attribute.IAttributeSupport#setAttribute(java.lang.Object,
72: * java.lang.Object)
73: */
74: synchronized public Object setAttribute(Object key, Object o) {
75: if (attributes == null) {
76: attributes = new HashMap();
77: }
78: return attributes.put(key, o);
79: }
80: }
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