package org.jolokia.restrictor.policy;
/*
* Copyright 2009-2011 Roland Huss
*
* 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.
*/
import java.util.HashSet;
import java.util.Set;
import org.jolokia.util.RequestType;
import org.w3c.dom.*;
/**
* Checks for a certain requst type which are specified within a <code><commands></code>
* section. If no such section is present, then all commands are allowed, otherwise only
* the given type is allowed by this checker.
* <p/>
* Allowed types are the names as defined in {@link RequestType}.
* <p/
* Example:
* <pre>
* <commands>
* <command>read</command>
* <command>list</command>
* </commands>
* </pre>
* @author roland
* @since 02.09.11
*/
public class RequestTypeChecker extends AbstractChecker<RequestType> {
private Set<RequestType> typeSet;
/**
* Checker for requests types
*
* @param pDoc document to examine for declared restrictions
*/
public RequestTypeChecker(Document pDoc) {
NodeList nodes = pDoc.getElementsByTagName("commands");
if (nodes.getLength() > 0) {
// Leave typeSet null if no commands has been given...
typeSet = new HashSet<RequestType>();
}
for (int i = 0;i<nodes.getLength();i++) {
Node node = nodes.item(i);
NodeList childs = node.getChildNodes();
for (int j = 0;j<childs.getLength();j++) {
Node commandNode = childs.item(j);
if (commandNode.getNodeType() != Node.ELEMENT_NODE) {
continue;
}
assertNodeName(commandNode,"command");
String typeName = commandNode.getTextContent().trim();
RequestType type = RequestType.getTypeByName(typeName);
typeSet.add(type);
}
}
}
/**
* Return true if either no <code><commands></code> section was in the policy or
* the given type was mentioned as allowed command
*
* @param pType the type to check
* @return true if the condition above is true
*/
@Override
public boolean check(RequestType pType) {
return typeSet == null || typeSet.contains(pType);
}
}