1 files changed, 79 insertions, 0 deletions
diff --git a/src/org/apache/http/protocol/DefaultedHttpContext.java b/src/org/apache/http/protocol/DefaultedHttpContext.java
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+++ b/src/org/apache/http/protocol/DefaultedHttpContext.java
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+/*
+ * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/protocol/DefaultedHttpContext.java $
+ * $Revision: 654882 $
+ * $Date: 2008-05-09 09:58:59 -0700 (Fri, 09 May 2008) $
+ *
+ * ====================================================================
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+package org.apache.http.protocol;
+
+/**
+ * {@link HttpContext} implementation that delegates resolution of an attribute
+ * to the given default {@link HttpContext} instance if the attribute is not 
+ * present in the local one. The state of the local context can be mutated,
+ * whereas the default context is treated as read-only.
+ *
+ * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
+ * 
+ * @version $Revision: 654882 $
+ */
+public final class DefaultedHttpContext implements HttpContext {
+
+    private final HttpContext local;
+    private final HttpContext defaults;
+    
+    public DefaultedHttpContext(final HttpContext local, final HttpContext defaults) {
+        super();
+        if (local == null) {
+            throw new IllegalArgumentException("HTTP context may not be null");
+        }
+        this.local = local;
+        this.defaults = defaults;
+    }
+
+    public Object getAttribute(final String id) {
+        Object obj = this.local.getAttribute(id);
+        if (obj == null) {
+            return this.defaults.getAttribute(id);
+        } else {
+            return obj;
+        }
+    }
+
+    public Object removeAttribute(final String id) {
+        return this.local.removeAttribute(id);
+    }
+
+    public void setAttribute(final String id, final Object obj) {
+        this.local.setAttribute(id, obj);
+    }
+
+    public HttpContext getDefaults() {
+        return this.defaults;
+    }
+    
+}