/*
 * GNU LESSER GENERAL PUBLIC LICENSE Copyright (C) 2006 The Lobo Project
 * 
 * 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.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 * 
 * Contact info: lobochief@users.sourceforge.net
 */
package com.nvarghese.beowulf.common.cobra.js;

import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;

public class JavaConstructorObject extends ScriptableObject implements Function {

	private final JavaClassWrapper classWrapper;
	private transient JavaInstantiator instantiator;
	private final String name;

	public JavaConstructorObject(final String name, final JavaClassWrapper classWrapper) {

		this.name = name;
		this.classWrapper = classWrapper;
		this.instantiator = new SimpleInstantiator(classWrapper);
	}

	public JavaConstructorObject(final String name, final JavaClassWrapper classWrapper, final JavaInstantiator instantiator) {

		this.name = name;
		this.classWrapper = classWrapper;
		this.instantiator = instantiator;
	}

	public String getClassName() {

		return this.name;
	}

	public Object call(final Context cx, final Scriptable scope, final Scriptable thisObj, final Object[] args) {

		throw new UnsupportedOperationException();
	}

	public Scriptable construct(final Context cx, final Scriptable scope, final Object[] args) {

		try {
			if (instantiator == null)
				instantiator = new SimpleInstantiator(classWrapper);
			Object javaObject = this.instantiator.newInstance();
			Scriptable newObject = new JavaObjectWrapper(this.classWrapper, javaObject);
			newObject.setParentScope(scope);
			return newObject;
		} catch (Exception err) {
			throw new IllegalStateException(err.getMessage());
		}
	}

	public java.lang.Object getDefaultValue(final java.lang.Class hint) {

		if (String.class.equals(hint)) {
			return "function " + this.name;
		} else {
			return super.getDefaultValue(hint);
		}
	}

	public static class SimpleInstantiator implements JavaInstantiator {

		private final JavaClassWrapper classWrapper;

		public SimpleInstantiator(final JavaClassWrapper classWrapper) {

			super();
			this.classWrapper = classWrapper;
		}

		public Object newInstance() throws InstantiationException, IllegalAccessException {

			return this.classWrapper.newInstance();
		}
	}
}