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/* ========================================================================== *
* Copyright (C) 2004-2006, Pier Fumagalli <http://could.it/> *
* All rights reserved. *
* ========================================================================== *
* *
* 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 it.could.webdav;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;
/**
* <p>The <a href="http://www.rfc-editor.org/rfc/rfc2518.txt">WebDAV</a>
* transactions processor.</p>
*
* @author <a href="http://could.it/">Pier Fumagalli</a>
*/
public class DAVProcessor {
/** <p>All the implemented methods, comma separated.</p> */
public static final String METHODS = "COPY,DELETE,GET,HEAD,MKCOL,MOVE," +
"OPTIONS,PROPFIND,PROPPATCH,PUT";
/** <p>A static map of all known webdav methods.</p> */
private static Map INSTANCES = new HashMap();
static {
/* Load and verify all the known methods */
final String thisName = DAVProcessor.class.getName();
final int packageDelimiter = thisName.lastIndexOf('.');
final String packageName = packageDelimiter < 1 ? "methods." :
thisName.substring(0, packageDelimiter) + ".methods.";
final StringTokenizer tokenizer = new StringTokenizer(METHODS, ",");
final ClassLoader classLoader = DAVProcessor.class.getClassLoader();
while (tokenizer.hasMoreTokens()) try {
final String method = tokenizer.nextToken();
final String className = packageName + method;
final Class clazz = classLoader.loadClass(className);
INSTANCES.put(method, (DAVMethod) clazz.newInstance());
} catch (Throwable throwable) {
InternalError error = new InternalError("Error loading method");
throw (InternalError) error.initCause(throwable);
}
}
/** <p>The {@link DAVRepository} associated with this instance.</p> */
private DAVRepository repository = null;
/**
* <p>Create a new {@link DAVProcessor} instance.</p>
*/
public DAVProcessor(DAVRepository repository) {
if (repository == null) throw new NullPointerException();
this.repository = repository;
}
/**
* <p>Process the specified {@link DAVTransaction} fully.</p>
*/
public void process(DAVTransaction transaction)
throws IOException {
try {
String method = transaction.getMethod();
if (INSTANCES.containsKey(method)) {
String path = transaction.getNormalizedPath();
DAVResource resource = this.repository.getResource(path);
DAVMethod instance = ((DAVMethod) INSTANCES.get(method));
instance.process(transaction, resource);
} else {
String message = "Method \"" + method + "\" not implemented";
throw new DAVException(501, message);
}
} catch (DAVException exception) {
exception.write(transaction);
}
}
public void setMethod( String methodKey, DAVMethod method ) {
INSTANCES.put( methodKey, method );
}
}
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