/*
 * Copyright (c) 2003-2004 Christopher Lenz and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     Christopher Lenz - initial API and implementation
 * 
 * $Id: AbstractRule.java,v 1.1 2004-09-02 18:07:12 jsurfer Exp $
 */

package net.sourceforge.phpeclipse.css.core.internal.model;

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

import net.sourceforge.phpeclipse.core.model.SourceReference;
import net.sourceforge.phpeclipse.css.core.model.IDeclaration;
import net.sourceforge.phpeclipse.css.core.model.IRule;
import net.sourceforge.phpeclipse.css.core.model.IStyleSheet;

import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;

/**
 * 
 */
public abstract class AbstractRule extends SourceReference
	implements IRule {

	// Instance Variables ------------------------------------------------------

	private IStyleSheet styleSheet;

	private IRule parent;

	private List children = new ArrayList(); 

	private List declarations = new ArrayList();

	// Constructors ------------------------------------------------------------

	/**
	 * Constructor.
	 * 
	 * @param document the document that contains the rule
	 * @param styleSheet the style sheet that contains the rule
	 */
	public AbstractRule(IDocument document, IStyleSheet styleSheet) {
		this(document, styleSheet, null);
	}

	/**
	 * Constructor.
	 * 
	 * @param document the document that contains the rule
	 * @param styleSheet the style sheet that contains the rule
	 * @param parent the parent rule, or <code>null</code> if the rule is at top
	 *        level
	 */
	public AbstractRule(IDocument document, IStyleSheet styleSheet,
		IRule parent) {
		super(document);
		this.styleSheet = styleSheet;
		this.parent = parent;
	}

	// IAdaptable Implementation -----------------------------------------------

	/*
	 * @see IAdaptable#getAdapter(Class)
	 */
	public Object getAdapter(Class adapter) {
		return Platform.getAdapterManager().getAdapter(this, adapter);
	}

	// IStyleRule Implementation -----------------------------------------------

	/*
	 * @see IRule#getStyleSheet()
	 */
	public final IStyleSheet getStyleSheet() {
		return styleSheet;
	}

	/*
	 * @see IRule#getParent()
	 */
	public final IRule getParent() {
		return parent;
	}

	/*
	 * @see IRule#getChildren()
	 */
	public final IRule[] getChildren() {
		return (IRule[]) children.toArray(new IRule[children.size()]);
	}

	/*
	 * @see IRule#getDeclarationAt(int)
	 */
	public final IDeclaration getDeclarationAt(int offset) {
		for (Iterator i = declarations.iterator(); i.hasNext(); ) {
			IDeclaration declaration = (IDeclaration) i.next();
			IRegion region = declaration.getSourceRegion();
			if ((offset > region.getOffset())
			 && (offset < (region.getOffset() + region.getLength()))) {
				return declaration;
			}
		}
		return null;
	}

	/*
	 * @see IRule#getDeclarations()
	 */
	public final IDeclaration[] getDeclarations() {
		return (IDeclaration[]) declarations.toArray(
			new IDeclaration[declarations.size()]);
	}

	// Public Methods ----------------------------------------------------------

	public final void addChild(IRule rule) {
		children.add(rule);
	}

	public final void addDeclaration(IDeclaration declaration) {
		declarations.add(declaration);
	}

}