/*
* 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 com.sun.org.apache.xml.internal.security.utils.resolver;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import com.sun.org.apache.xml.internal.security.signature.XMLSignatureInput;
import org.w3c.dom.Attr;
/**
* During reference validation, we have to retrieve resources from somewhere.
* This is done by retrieving a Resolver. The resolver needs two arguments: The
* URI in which the link to the new resource is defined and the BaseURI of the
* file/entity in which the URI occurs (the BaseURI is the same as the SystemId.
*
* <UL xml:lang="DE" LANG="DE">
* <LI> Verschiedene Implementierungen k??nnen sich als Resolver registrieren.
* <LI> Standardm????ig werden erste Implementierungen auf dem XML config file registrirt.
* <LI> Der Benutzer kann bei Bedarf Implementierungen voranstellen oder anf??gen.
* <LI> Implementierungen k??nnen mittels Features customized werden ??
* (z.B. um Proxy-Passworter ??bergeben zu k??nnen).
* <LI> Jede Implementierung bekommt das URI Attribut und den Base URI
* ??bergeben und muss antworten, ob sie aufl??sen kann.
* <LI> Die erste Implementierung, die die Aufgabe erf??llt, f??hrt die Aufl??sung durch.
* </UL>
*
* @author $Author: raul $
*/
public class ResourceResolver {
/** {@link java.util.logging} logging facility */
static java.util.logging.Logger log =
java.util.logging.Logger.getLogger(ResourceResolver.class.getName());
/** Field _alreadyInitialized */
static boolean _alreadyInitialized = false;
/** these are the system-wide resolvers */
static List _resolverVector = null;
/** Field _individualResolverVector */
List _individualResolverVector = null;
/** Field transformSpi */
protected ResourceResolverSpi _resolverSpi = null;
/**
* Constructor ResourceResolver
*
* @param className
* @throws ClassNotFoundException
* @throws IllegalAccessException
* @throws InstantiationException
*/
private ResourceResolver(String className)
throws ClassNotFoundException, IllegalAccessException,
InstantiationException {
this._resolverSpi =
(ResourceResolverSpi) Class.forName(className).newInstance();
}
/**
* Constructor ResourceResolver
*
* @param resourceResolver
*/
public ResourceResolver(ResourceResolverSpi resourceResolver) {
this._resolverSpi = resourceResolver;
}
/**
* Method getInstance
*
* @param uri
* @param BaseURI
* @return the instnace
*
* @throws ResourceResolverException
*/
public static final ResourceResolver getInstance(Attr uri, String BaseURI)
throws ResourceResolverException {
int length=ResourceResolver._resolverVector.size();
for (int i = 0; i < length; i++) {
ResourceResolver resolver =
(ResourceResolver) ResourceResolver._resolverVector.get(i);
if (true)
if (log.isLoggable(java.util.logging.Level.FINE)) log.log(java.util.logging.Level.FINE, "check resolvability by class " + resolver.getClass().getName());
if ((resolver != null) && resolver.canResolve(uri, BaseURI)) {
return resolver;
}
}
Object exArgs[] = { ((uri != null)
? uri.getNodeValue()
: "null"), BaseURI };
throw new ResourceResolverException("utils.resolver.noClass", exArgs,
uri, BaseURI);
}
/**
* Method getInstance
*
* @param uri
* @param BaseURI
* @param individualResolvers
* @return the instance
*
* @throws ResourceResolverException
*/
public static final ResourceResolver getInstance(
Attr uri, String BaseURI, List individualResolvers)
throws ResourceResolverException {
if (true) {
if (log.isLoggable(java.util.logging.Level.FINE)) log.log(java.util.logging.Level.FINE, "I was asked to create a ResourceResolver and got " + individualResolvers.size());
if (log.isLoggable(java.util.logging.Level.FINE)) log.log(java.util.logging.Level.FINE, " extra resolvers to my existing " + ResourceResolver._resolverVector.size() + " system-wide resolvers");
}
// first check the individual Resolvers
int size=0;
if ((individualResolvers != null) && ((size=individualResolvers.size()) > 0)) {
for (int i = 0; i < size; i++) {
ResourceResolver resolver =
(ResourceResolver) individualResolvers.get(i);
if (resolver != null) {
String currentClass = resolver._resolverSpi.getClass().getName();
if (true)
if (log.isLoggable(java.util.logging.Level.FINE)) log.log(java.util.logging.Level.FINE, "check resolvability by class " + currentClass);
if (resolver.canResolve(uri, BaseURI)) {
return resolver;
}
}
}
}
return getInstance(uri,BaseURI);
}
/**
* The init() function is called by com.sun.org.apache.xml.internal.security.Init.init()
*/
public static void init() {
if (!ResourceResolver._alreadyInitialized) {
ResourceResolver._resolverVector = new ArrayList(10);
_alreadyInitialized = true;
}
}
/**
* Method register
*
* @param className
*/
public static void register(String className) {
ResourceResolver resolver = null;
try {
resolver = new ResourceResolver(className);
ResourceResolver._resolverVector.add(resolver);
} catch (Exception e) {
// Object exArgs[] = { ((uri != null)
// ? uri.getNodeValue()
// : "null"), BaseURI };
//
// throw new ResourceResolverException("utils.resolver.noClass",
// exArgs, e, uri, BaseURI);
log.log(java.util.logging.Level.WARNING, "Error loading resolver " + className +" disabling it");
} catch (NoClassDefFoundError e) {
log.log(java.util.logging.Level.WARNING, "Error loading resolver " + className +" disabling it");
}
}
/**
* Method registerAtStart
*
* @param className
*/
public static void registerAtStart(String className) {
ResourceResolver._resolverVector.add(0, className);
}
/**
* Method resolve
*
* @param uri
* @param BaseURI
* @return the resource
*
* @throws ResourceResolverException
*/
public static XMLSignatureInput resolveStatic(Attr uri, String BaseURI)
throws ResourceResolverException {
ResourceResolver myResolver = ResourceResolver.getInstance(uri, BaseURI);
return myResolver.resolve(uri, BaseURI);
}
/**
* Method resolve
*
* @param uri
* @param BaseURI
* @return the resource
*
* @throws ResourceResolverException
*/
public XMLSignatureInput resolve(Attr uri, String BaseURI)
throws ResourceResolverException {
return this._resolverSpi.engineResolve(uri, BaseURI);
}
/**
* Method setProperty
*
* @param key
* @param value
*/
public void setProperty(String key, String value) {
this._resolverSpi.engineSetProperty(key, value);
}
/**
* Method getProperty
*
* @param key
* @return the value of the property
*/
public String getProperty(String key) {
return this._resolverSpi.engineGetProperty(key);
}
/**
* Method addProperties
*
* @param properties
*/
public void addProperties(Map properties) {
this._resolverSpi.engineAddProperies(properties);
}
/**
* Method getPropertyKeys
*
* @return all property keys.
*/
public String[] getPropertyKeys() {
return this._resolverSpi.engineGetPropertyKeys();
}
/**
* Method understandsProperty
*
* @param propertyToTest
* @return true if the resolver understands the property
*/
public boolean understandsProperty(String propertyToTest) {
return this._resolverSpi.understandsProperty(propertyToTest);
}
/**
* Method canResolve
*
* @param uri
* @param BaseURI
* @return true if it can resolve the uri
*/
private boolean canResolve(Attr uri, String BaseURI) {
return this._resolverSpi.engineCanResolve(uri, BaseURI);
}
}
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