/*
 * Copyright (c) 2012, grossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

package org.jowidgets.util.reflection;

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

import org.jowidgets.util.Assert;
import org.jowidgets.util.IIterationCallback;

public final class ReflectionUtils {

    private ReflectionUtils() {}

    public static Set<Method> getMethods(final Class<?> type) {
        Assert.paramNotNull(type, "type");
        final Set<Method> result = new HashSet<Method>();
        for (final Method method : type.getMethods()) {
            result.add(method);
        }
        return result;
    }

    /**
     * Iterates over all classes and interfaces in the type hierarchy of this type (including this type).
     * Each class or interface will only be iterated once
     * 
     * @param type The type to iterate over
     * @param callback The callback
     */
    public static void iterateHierarchy(final Class<?> type, final IIterationCallback<Class<?>> callback) {
        Assert.paramNotNull(type, "type");
        Assert.paramNotNull(callback, "callback");
        iterateHierarchy(new HashSet<Class<?>>(), type, callback);
    }

    private static void iterateHierarchy(
        final Set<Class<?>> visited,
        final Class<?> type,
        final IIterationCallback<Class<?>> callback) {
        if (type != null && !visited.contains(type)) {
            callback.next(type);
            visited.add(type);
            iterateHierarchy(visited, type.getSuperclass(), callback);
            for (final Class<?> implemented : type.getInterfaces()) {
                iterateHierarchy(visited, implemented, callback);
            }
        }
    }

}