/*******************************************************************************
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 *
 *******************************************************************************/
package com.liferay.ide.project.core;

import com.liferay.ide.core.ExtensionReader;
import com.liferay.ide.project.core.descriptor.LiferayDescriptorHelper;

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

import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.content.IContentType;


/**
 * @author Kuo Zhang
 */
public class LiferayDescriptorHelperReader extends ExtensionReader<LiferayDescriptorHelper>
{

    private static final String EXTENSION = "liferayDescriptorHelpers";
    private static final String HELPER_ELEMENT = "liferayDescriptorHelper";
    private static final String CONTENTTYPEBINDING_ELEMENT = "contentTypeBinding";
    private static LiferayDescriptorHelperReader instance;

    public static LiferayDescriptorHelperReader getInstance()
    {
        if( instance == null )
        {
            instance = new LiferayDescriptorHelperReader();
        }

        return instance;
    }

    private LiferayDescriptorHelperReader()
    {
        super( ProjectCore.PLUGIN_ID, EXTENSION, HELPER_ELEMENT );
    }

    @Override
    protected LiferayDescriptorHelper initElement( IConfigurationElement configElement, LiferayDescriptorHelper helper )
    {
        helper.setContentType( configElement.getAttribute( CONTENTTYPEBINDING_ELEMENT ) );

        return helper;
    }

    public LiferayDescriptorHelper[] getAllHelpers()
    {
        return getExtensions().toArray( new LiferayDescriptorHelper[0] );
    }

    public LiferayDescriptorHelper[] getHelpers( IContentType contentType )
    {
        List<LiferayDescriptorHelper> retval = new ArrayList<LiferayDescriptorHelper>();

        for( LiferayDescriptorHelper helper : getAllHelpers() )
        {
            if( contentType.equals( helper.getContentType() ) )
            {
                retval.add( helper );
            }
        }

        return retval.toArray( new LiferayDescriptorHelper[0] );
    }
}