/*
* ====================================================================
* 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;
import java.util.
Map;
import java.util.concurrent.
ConcurrentHashMap;
import org.apache.http.annotation.
ThreadingBehavior;
import org.apache.http.annotation.
Contract;
import org.apache.http.util.
Args;
/**
* Default implementation of {@link HttpContext}.
* <p>
* Please note instances of this class can be thread unsafe if the
* parent context is not thread safe.
*
* @since 4.0
*/
@
Contract(threading =
ThreadingBehavior.
SAFE_CONDITIONAL)
public class
BasicHttpContext implements
HttpContext {
private final
HttpContext parentContext;
private final
Map<
String,
Object>
map;
public
BasicHttpContext() {
this(null);
}
public
BasicHttpContext(final
HttpContext parentContext) {
super();
this.
map = new
ConcurrentHashMap<
String,
Object>();
this.
parentContext =
parentContext;
}
@
Override
public
Object getAttribute(final
String id) {
Args.
notNull(
id, "Id");
Object obj = this.
map.
get(
id);
if (
obj == null && this.
parentContext != null) {
obj = this.
parentContext.
getAttribute(
id);
}
return
obj;
}
@
Override
public void
setAttribute(final
String id, final
Object obj) {
Args.
notNull(
id, "Id");
if (
obj != null) {
this.
map.
put(
id,
obj);
} else {
this.
map.
remove(
id);
}
}
@
Override
public
Object removeAttribute(final
String id) {
Args.
notNull(
id, "Id");
return this.
map.
remove(
id);
}
/**
* @since 4.2
*/
public void
clear() {
this.
map.
clear();
}
@
Override
public
String toString() {
return this.
map.
toString();
}
}