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 *
 * Copyright (c) 2014-2015 Oracle and/or its affiliates. All rights reserved.
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 * 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.
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package org.glassfish.hk2.utilities.reflection;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Set;

/**
 * An interface representing useful reflection utilities
 * 
 * @author jwells
 */
public interface ClassReflectionHelper {
    
    /**
     * Gets all methods for a class (taking class heirarchy into account)
     * 
     * @param clazz The class to analyze for all methods
     * @return The set of all methods on this class (and all subclasses)
     */
    public Set getAllMethods(Class clazz);
    
    /**
     * Creates a method wrapper from the given method
     * 
     * @param m A non-null method to create a wrapper from
     * @return A method wrapper
     */
    public MethodWrapper createMethodWrapper(Method m);
    
    /**
     * Gets all fields for a class (taking class heirarchy into account)
     * 
     * @param clazz The class to analyze for all fields
     * @return The set of all fields on this class (and all subclasses)
     */
    public Set getAllFields(Class clazz);
    
    /**
     * Finds the postConstruct method on this class
     * 
     * @param clazz The class to check for the postConstruct method
     * @param matchingClass The PostConstruct interface, a small performance improvement
     * @return A matching method, or null if none can be found
     * @throws IllegalArgumentException If a method marked as postConstruct is invalid
     */
    public Method findPostConstruct(Class clazz, Class matchingClass) throws IllegalArgumentException;
    
    /**
     * Finds the preDestroy method on this class
     * 
     * @param clazz The class to check for the postConstruct method
     * @param matchingClass The PostConstruct interface, a small performance improvement
     * @return A matching method, or null if none can be found
     * @throws IllegalArgumentException If a method marked as postConstruct is invalid
     */
    public Method findPreDestroy(Class clazz, Class matchingClass) throws IllegalArgumentException;
    
    /**
     * Removes this class (and all appropriate sub-classes) from the cache
     * 
     * @param clazz The class to remove.  If null this method does nothing
     */
    public void clean(Class clazz);
    
    /**
     * Releases the entire cache, though the ClassReflectionHelper is
     * still usable after calling dispose
     */
    public void dispose();
    
    /**
     * Returns an approximation of the current size of the cache
     * @return An approximation of the current size of the cache
     */
    public int size();

}