/*
 * Copyright 2005-2010 the original author or authors.
 * 
 * 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 org.wamblee.wicket.behavior;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.wicket.Application;
import org.apache.wicket.Component;
import org.apache.wicket.Response;
import org.apache.wicket.behavior.IBehavior;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.html.IHeaderContributor;
import org.apache.wicket.markup.html.IHeaderResponse;
import org.apache.wicket.markup.html.internal.HeaderResponse;

/**
 * Composite behavior that allows combining a sequence of behaviors in one. This
 * behavior return true by default for {@link #getStatelessHint(Component)}. It
 * also returns false by default for {@link #isTemporary()}.
 */
public class CompositeBehavior implements IBehavior, IHeaderContributor {

    private List<IBehavior> behaviors;

    /**
     * Constructs the behvavior
     * 
     * @param aBehaviors
     *            Array of behaviors.
     */
    public CompositeBehavior(IBehavior... aBehaviors) {
        behaviors = new ArrayList<IBehavior>(Arrays.asList(aBehaviors));
    }

    /**
     * Adds a behavior
     * 
     * @param aBehavior
     *            Behavior.
     */
    public void add(IBehavior aBehavior) {
        behaviors.add(aBehavior);
    }

    @Override
    public void bind(Component aComponent) {
        for (IBehavior behavior : behaviors) {
            behavior.bind(aComponent);
        }
    }

    @Override
    public void detach(Component aComponent) {
        for (IBehavior behavior : behaviors) {
            behavior.detach(aComponent);
        }
    }

    @Override
    public void exception(Component aComponent, RuntimeException aException) {
        for (IBehavior behavior : behaviors) {
            behavior.exception(aComponent, aException);
        }
    }

    @Override
    public void onComponentTag(Component aComponent, ComponentTag aTag) {
        for (IBehavior behavior : behaviors) {
            behavior.onComponentTag(aComponent, aTag);
        }
    }

    @Override
    public void renderHead(IHeaderResponse aResponse) {
        for (IBehavior behavior : behaviors) {
            if (behavior instanceof IHeaderContributor) {
                ((IHeaderContributor) behavior).renderHead(aResponse);
            }
        }
    }

    @Override
    public void beforeRender(Component aComponent) {
        for (IBehavior behavior : behaviors) {
            behavior.beforeRender(aComponent);
        }
    }

    @Override
    public void afterRender(Component aComponent) {
        for (IBehavior behavior : behaviors) {
            behavior.afterRender(aComponent);
        }
    }

    @Override
    public boolean getStatelessHint(Component aComponent) {
        return false;
    }

    @Override
    public boolean isEnabled(Component aComponent) {
        for (IBehavior behavior : behaviors) {
            if (!behavior.isEnabled(aComponent)) {
                return false;
            }
        }
        return true;
    }

    @Override
    public boolean isTemporary() {
        return false;
    }
}