/*
* Copyright 1999-2004 The Apache Software Foundation
*
* Licensed 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;
/**
* <p>Private implementation of <code>Map</code> for servlet parameter
* name-value.</p>
*
* @author Craig R. McClanahan
* @version $Revision: 1.4 $ $Date: 2004/09/10 22:43:20 $
*/
final class ServletParamMap implements Map {
public ServletParamMap(HttpServletRequest request) {
this.request = request;
}
private HttpServletRequest request = null;
public void clear() {
throw new UnsupportedOperationException();
}
public boolean containsKey(Object key) {
return (request.getParameter(key(key)) != null);
}
public boolean containsValue(Object value) {
Iterator values = values().iterator();
while (values.hasNext()) {
if (value.equals(values.next())) {
return (true);
}
}
return (false);
}
public Set entrySet() {
Set set = new HashSet();
Enumeration keys = request.getParameterNames();
String key;
while (keys.hasMoreElements()) {
key = (String)keys.nextElement();
set.add(new MapEntry(key, request.getParameter(key), false));
}
return (set);
}
public boolean equals(Object o) {
return (request.equals(o));
}
public Object get(Object key) {
return (request.getParameter(key(key)));
}
public int hashCode() {
return (request.hashCode());
}
public boolean isEmpty() {
return (size() < 1);
}
public Set keySet() {
Set set = new HashSet();
Enumeration keys = request.getParameterNames();
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.getParameterNames();
while (keys.hasMoreElements()) {
keys.nextElement();
n++;
}
return (n);
}
public Collection values() {
List list = new ArrayList();
Enumeration keys = request.getParameterNames();
while (keys.hasMoreElements()) {
list.add(request.getParameter((String) keys.nextElement()));
}
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());
}
}
}