| /* |
| * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/params/DefaultedHttpParams.java $ |
| * $Revision: 610763 $ |
| * $Date: 2008-01-10 04:01:13 -0800 (Thu, 10 Jan 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.params; |
| |
| import org.apache.http.params.HttpParams; |
| |
| /** |
| * {@link HttpParams} implementation that delegates resolution of a parameter |
| * to the given default {@link HttpParams} instance if the parameter is not |
| * present in the local one. The state of the local collection can be mutated, |
| * whereas the default collection is treated as read-only. |
| * |
| * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a> |
| * |
| * @version $Revision: 610763 $ |
| */ |
| public final class DefaultedHttpParams extends AbstractHttpParams { |
| |
| private final HttpParams local; |
| private final HttpParams defaults; |
| |
| public DefaultedHttpParams(final HttpParams local, final HttpParams defaults) { |
| super(); |
| if (local == null) { |
| throw new IllegalArgumentException("HTTP parameters may not be null"); |
| } |
| this.local = local; |
| this.defaults = defaults; |
| } |
| |
| /** |
| * Creates a copy of the local collection with the same default |
| */ |
| public HttpParams copy() { |
| HttpParams clone = this.local.copy(); |
| return new DefaultedHttpParams(clone, this.defaults); |
| } |
| |
| /** |
| * Retrieves the value of the parameter from the local collection and, if the |
| * parameter is not set locally, delegates its resolution to the default |
| * collection. |
| */ |
| public Object getParameter(final String name) { |
| Object obj = this.local.getParameter(name); |
| if (obj == null && this.defaults != null) { |
| obj = this.defaults.getParameter(name); |
| } |
| return obj; |
| } |
| |
| /** |
| * Attempts to remove the parameter from the local collection. This method |
| * <i>does not</i> modify the default collection. |
| */ |
| public boolean removeParameter(final String name) { |
| return this.local.removeParameter(name); |
| } |
| |
| /** |
| * Sets the parameter in the local collection. This method <i>does not</i> |
| * modify the default collection. |
| */ |
| public HttpParams setParameter(final String name, final Object value) { |
| return this.local.setParameter(name, value); |
| } |
| |
| public HttpParams getDefaults() { |
| return this.defaults; |
| } |
| |
| } |