/*************************************************************************
* Copyright 2009-2012 Eucalyptus Systems, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
* Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
* CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
* additional information or have any questions.
*
* This file may incorporate work covered under the following copyright
* and permission notice:
*
* Software License Agreement (BSD License)
*
* Copyright (c) 2008, Regents of the University of California
* All rights reserved.
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* AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
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* WHICH IN THE REGENTS' DISCRETION MAY INCLUDE, WITHOUT LIMITATION,
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************************************************************************/
package com.eucalyptus.auth.policy;
import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;
import org.apache.log4j.Logger;
import com.eucalyptus.auth.policy.annotation.PolicyResourceType;
import com.eucalyptus.bootstrap.ServiceJarDiscovery;
import com.eucalyptus.system.Ats;
public class PolicyAnnotationRegistry extends ServiceJarDiscovery {
private static Logger LOG = Logger.getLogger( PolicyAnnotationRegistry.class );
private static final Map<Class, PolicyResourceType> classToPolicyRscType = new HashMap<Class, PolicyResourceType>( );
public static PolicyResourceType extractResourceType( Object classOrInstance ) throws NoSuchElementException {
Class type = classOrInstance instanceof Class
? ( Class ) classOrInstance
: classOrInstance.getClass( );
PolicyResourceType rscPolicy = PolicyAnnotationRegistry.extractPolicyResourceTypeFromSuperclass( type );
if ( rscPolicy != null ) {
classToPolicyRscType.put( type, rscPolicy );
return rscPolicy;
} else {
throw new NoSuchElementException( "The argument " + type.getName( )
+ " does not itself have or inherit from an object with the required @PolicyResourceType annotation." );
}
}
private static PolicyResourceType extractPolicyResourceTypeFromSuperclass( Class type ) {
LOG.trace( "PolicyAnnotationRegistry: looking for annotations starting at " + type );
for ( Class c = type; c != Object.class; c = c.getSuperclass( ) ) {
LOG.trace( "PolicyAnnotationRegistry: check -> " + c );
if ( classToPolicyRscType.containsKey( c ) ) {
LOG.trace( "PolicyAnnotationRegistry: FOUND => " + c );
return classToPolicyRscType.get( c );
} else {
PolicyResourceType rscPolicy = PolicyAnnotationRegistry.extractPolicyResourceTypeFromInterfaces( type.getInterfaces( ) );
if ( rscPolicy != null ) {
return rscPolicy;
}
}
}
return null;
}
private static PolicyResourceType extractPolicyResourceTypeFromInterfaces( Class[] interfaces ) {
for ( Class i : interfaces ) {
LOG.trace( "PolicyAnnotationRegistry: check => " + i );
if ( classToPolicyRscType.containsKey( i ) ) {
LOG.trace( "PolicyAnnotationRegistry: FOUND => " + i );
return classToPolicyRscType.get( i );
}
}
return null;
}
@Override
public boolean processClass( Class candidate ) throws Exception {
if ( Ats.from( candidate ).has( PolicyResourceType.class ) ) {
PolicyResourceType policyRscType = Ats.from( candidate ).get( PolicyResourceType.class );
classToPolicyRscType.put( candidate, policyRscType );
return true;
} else {
return false;
}
}
@Override
public Double getPriority( ) {
return 1.0d;
}
}