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An implementation of the GoF Chain of Responsibility pattern
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/*
* 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.
*/
package org.apache.commons.chain.web.servlet;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.chain.web.MapEntry;
/**
* Private implementation of Map
for servlet request
* name-values[].
*
* @author Craig R. McClanahan
* @version $Revision: 480477 $ $Date: 2006-11-29 08:34:52 +0000 (Wed, 29 Nov 2006) $
*/
final class ServletHeaderValuesMap implements Map {
public ServletHeaderValuesMap(HttpServletRequest request) {
this.request = request;
}
private HttpServletRequest request = null;
public void clear() {
throw new UnsupportedOperationException();
}
public boolean containsKey(Object key) {
return (request.getHeader(key(key)) != null);
}
public boolean containsValue(Object value) {
if (!(value instanceof String[])) {
return (false);
}
String[] test = (String[]) value;
Iterator values = values().iterator();
while (values.hasNext()) {
String[] actual = (String[]) values.next();
if (test.length == actual.length) {
boolean matched = true;
for (int i = 0; i < test.length; i++) {
if (!test[i].equals(actual[i])) {
matched = false;
break;
}
}
if (matched) {
return (true);
}
}
}
return (false);
}
public Set entrySet() {
Set set = new HashSet();
Enumeration keys = request.getHeaderNames();
String key;
while (keys.hasMoreElements()) {
key = (String) keys.nextElement();
set.add(new MapEntry(key, request.getHeaders(key), false));
}
return (set);
}
public boolean equals(Object o) {
return (request.equals(o));
}
public Object get(Object key) {
List list = new ArrayList();
Enumeration values = request.getHeaders(key(key));
while (values.hasMoreElements()) {
list.add((String) values.nextElement());
}
return (((String[]) list.toArray(new String[list.size()])));
}
public int hashCode() {
return (request.hashCode());
}
public boolean isEmpty() {
return (size() < 1);
}
public Set keySet() {
Set set = new HashSet();
Enumeration keys = request.getHeaderNames();
while (keys.hasMoreElements()) {
set.add(keys.nextElement());
}
return (set);
}
public Object put(Object key, Object value) {
throw new UnsupportedOperationException();
}
public void putAll(Map map) {
throw new UnsupportedOperationException();
}
public Object remove(Object key) {
throw new UnsupportedOperationException();
}
public int size() {
int n = 0;
Enumeration keys = request.getHeaderNames();
while (keys.hasMoreElements()) {
keys.nextElement();
n++;
}
return (n);
}
public Collection values() {
List list = new ArrayList();
Enumeration keys = request.getHeaderNames();
while (keys.hasMoreElements()) {
String key = (String) keys.nextElement();
List list1 = new ArrayList();
Enumeration values = request.getHeaders(key);
while (values.hasMoreElements()) {
list1.add((String) values.nextElement());
}
list.add(((String[]) list1.toArray(new String[list1.size()])));
}
return (list);
}
private String key(Object key) {
if (key == null) {
throw new IllegalArgumentException();
} else if (key instanceof String) {
return ((String) key);
} else {
return (key.toString());
}
}
}