/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 de.unioninvestment.eai.portal.portlet.crud.scripting.model;

import groovy.lang.Closure;
import groovy.lang.GroovyCallable;

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

import org.codehaus.groovy.runtime.GroovyCategorySupport;

import de.unioninvestment.eai.portal.portlet.crud.domain.model.filter.Filter;

/**
 * 
 * Konfiguratinsklasse für einen Filterclosure.
 * 
 * @author siva.selvarajah
 */
public class FilterClosureCallable implements GroovyCallable<List<Filter>> {

	private Closure<?> filterClosure;

	/**
	 * 
	 * Klasse zum überschreiben des any-Closures.
	 * 
	 * @author siva.selvarajah
	 */
	public static class OverrideAny {
		/**
		 * Überschreibt das Any-Closure.
		 * 
		 * @param me
		 *            Closure
		 * @param cl
		 *            Closure
		 */
		public static void any(Closure<?> me, Closure<?> cl) {
			Closure<?> x = me;
			while (x.getDelegate() == null) {
				x = (Closure<?>) x.getOwner();
			}
			ScriptFilterFactory factory = (ScriptFilterFactory) x.getDelegate();
			factory.any(cl);
		}
	}

	/**
	 * Konfiguriert einen Filterclosure und ruft es dannach auf.
	 * 
	 * @param filterClosure
	 *            Zu konfigurierdes Closure
	 */
	public FilterClosureCallable(Closure<?> filterClosure) {
		this.filterClosure = filterClosure;
	}

	@Override
	public List<Filter> call() {
		List<Filter> filters = new ArrayList<Filter>();
		ScriptFilterFactory factory = new ScriptFilterFactory(filters);
		filterClosure.setDelegate(factory);
		filterClosure.setResolveStrategy(Closure.DELEGATE_FIRST);

		GroovyCategorySupport.use(OverrideAny.class, filterClosure);

		return filters;
	}

}