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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 */

package org.glassfish.apf.impl;

import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.text.MessageFormat;

import org.glassfish.apf.AnnotationHandler;
import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.Descriptor;
import org.glassfish.hk2.api.IndexedFilter;
import org.glassfish.hk2.api.ServiceLocator;


/**
 * Bag for utility methods
 *
 * @author Jerome Dochez
 */
public class AnnotationUtils {
    
    private static Logger logger;
    private static String whatToLog="";

    public static Logger getLogger() {
        if (logger==null) {
            logger = Logger.global;
        }
        return logger;        
    }

    public static void setLogger(Logger lg) {
        logger = lg;
    }
    
    public static void setLoggerTarget(String what) {
        whatToLog = what;
    }
    
    public static String getLoggerTarget() {
        return whatToLog;
    }
    
    public static boolean shouldLog(String what) {
        
        if (logger.isLoggable(Level.FINER)) {
            if (whatToLog.indexOf(what)!=-1) 
                return true;
            if ("*".equals(whatToLog))
                return true;
        }
        return false;
    }
    
    public static String getLocalString(String key, String defaultString, Object... arguments){
        return MessageFormat.format(defaultString, arguments);
    }
    
    /**
     * Gets the annotation handler for the given class (without causing any of the annotation handlers
     * to be classloaded)
     * 
     * @param locator The locator to find the annotation handler for
     * @param forThis The class to find the annotation handler for
     * @return
     */
    @SuppressWarnings("unchecked")
    public static ActiveDescriptor getAnnotationHandlerForDescriptor(ServiceLocator locator, final Class forThis) {
        ActiveDescriptor retVal = locator.getBestDescriptor(new IndexedFilter() {

            @Override
            public boolean matches(Descriptor d) {
                Map> metadata = d.getMetadata();
                List handlerForList = metadata.get(AnnotationHandler.ANNOTATION_HANDLER_METADATA);
                if (handlerForList == null || handlerForList.isEmpty()) return false;
                
                String descriptorForThis = handlerForList.get(0);
                
                return descriptorForThis.equals(forThis.getName());
            }

            @Override
            public String getAdvertisedContract() {
                return AnnotationHandler.class.getName();
            }

            @Override
            public String getName() {
                return null;
            }
            
        });
        
        return (ActiveDescriptor) retVal;
    }
}