/*
 *   Copyright 2013 Brian Rosenberger (Brutex Network)
 *
 *   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 net.brutex.xservices.security;

import org.apache.log4j.Logger;
import org.apache.shiro.authz.Permission;
import org.apache.shiro.util.AntPathMatcher;

/**
 * @author Brian Rosenberger, bru(at)brutex.de
 *
 */
public class DirectoryPermission implements Permission {

	private final Logger logger = Logger.getLogger(DirectoryPermission.class);
	private final String path;

	public DirectoryPermission(String antlikepath) {
		logger.debug(String.format("Creating permission for path '%s'", antlikepath));
		path = antlikepath;
	}
	
	@Override
	public boolean implies(Permission p) {
		boolean result = false;
		
		/* is of same type */
		if(! (p instanceof DirectoryPermission)) {			
			logger.debug(String.format("Testing if permission of type '%s' implies permission of type '%s'. Result was '%s'"  , this.getClass(), p.getClass(), result));
			return result;
		}
		
		/* comparing to non null directory */
		if( ((DirectoryPermission)p).getPath() == null) {
			logger.debug(String.format("Testing if DirectoryPermission '%s' implies permission to 'null'. Result was '%s'"  , this.getPath(), result));
			return result;
		}
		
		/* directory pattern implies other */
		if( (new AntPathMatcher()).matches(path, ((DirectoryPermission)p).getPath()) ) {
			result = true;
		}
		logger.debug(String.format("Testing if DirectoryPermission '%s' implies permission to '%s'. Result was '%s'"  , this.getPath(), ((DirectoryPermission) p).getPath(), result));
		
		return result;
	}
	
	public String getPath() {
		return path;
	}

}