1069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project/*
2069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/protocol/DefaultedHttpContext.java $
3069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * $Revision: 654882 $
4069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * $Date: 2008-05-09 09:58:59 -0700 (Fri, 09 May 2008) $
5069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project *
6069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * ====================================================================
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9069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * distributed with this work for additional information
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14069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project *
15069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project *   http://www.apache.org/licenses/LICENSE-2.0
16069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project *
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29069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project *
30069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project */
31069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project
32069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectpackage org.apache.http.protocol;
33069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project
34069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project/**
35069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * {@link HttpContext} implementation that delegates resolution of an attribute
36069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * to the given default {@link HttpContext} instance if the attribute is not
37069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * present in the local one. The state of the local context can be mutated,
38069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * whereas the default context is treated as read-only.
39069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project *
40069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
41069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project *
42069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * @version $Revision: 654882 $
43069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project */
44069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectpublic final class DefaultedHttpContext implements HttpContext {
45069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project
46069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project    private final HttpContext local;
47069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project    private final HttpContext defaults;
48069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project
49069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project    public DefaultedHttpContext(final HttpContext local, final HttpContext defaults) {
50069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project        super();
51069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project        if (local == null) {
52069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project            throw new IllegalArgumentException("HTTP context may not be null");
53069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project        }
54069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project        this.local = local;
55069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project        this.defaults = defaults;
56069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project    }
57069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project
58069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project    public Object getAttribute(final String id) {
59069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project        Object obj = this.local.getAttribute(id);
60069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project        if (obj == null) {
61069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project            return this.defaults.getAttribute(id);
62069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project        } else {
63069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project            return obj;
64069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project        }
65069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project    }
66069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project
67069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project    public Object removeAttribute(final String id) {
68069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project        return this.local.removeAttribute(id);
69069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project    }
70069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project
71069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project    public void setAttribute(final String id, final Object obj) {
72069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project        this.local.setAttribute(id, obj);
73069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project    }
74069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project
75069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project    public HttpContext getDefaults() {
76069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project        return this.defaults;
77069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project    }
78069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project
79069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project}
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