/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.ui.filters;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.dltk.core.IModelElement;
import org.eclipse.dltk.internal.ui.util.StringMatcher;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;

/**
 * The NamePatternFilter selects the elements which match the given string
 * patterns.
 * <p>
 * The following characters have special meaning: ? => any character * => any
 * string
 * </p>
 *
 *
 */
public class NamePatternFilter extends ViewerFilter {
	private String[] fPatterns;
	private StringMatcher[] fMatchers;

	/**
	 * Return the currently configured StringMatchers.
	 */
	private StringMatcher[] getMatchers() {
		return fMatchers;
	}

	/**
	 * Gets the patterns for the receiver.
	 */
	public String[] getPatterns() {
		return fPatterns;
	}


	@Override
	public boolean select(Viewer viewer, Object parentElement, Object element) {
		String matchName= null;
		if (element instanceof IModelElement) {
			if( viewer instanceof IFilterElementNameProvider ) {
				matchName = ((IFilterElementNameProvider) viewer)
						.getElementName(element);
			}
			else {
				matchName= ((IModelElement) element).getElementName();
			}
		} else if (element instanceof IAdaptable) {
			IAdaptable adaptable= (IAdaptable) element;
			IModelElement modelElement = adaptable
					.getAdapter(IModelElement.class);
			if (modelElement != null)
				if( viewer instanceof IFilterElementNameProvider ) {
					matchName= ((IFilterElementNameProvider)viewer).getElementName(modelElement);
				}
				else {
					matchName= modelElement.getElementName();
				}
			else {
				IResource resource = adaptable.getAdapter(IResource.class);
				if (resource != null)
					matchName= resource.getName();
			}
		}
		if (matchName != null) {
			StringMatcher[] testMatchers= getMatchers();
			for (int i = 0; i < testMatchers.length; i++) {
				if (testMatchers[i].match(matchName))
					return false;
			}
			return true;
		}
		return true;
	}

	/**
	 * Sets the patterns to filter out for the receiver.
	 * <p>
	 * The following characters have special meaning:
	 *   ? => any character
	 *   * => any string
	 * </p>
	 */
	public void setPatterns(String[] newPatterns) {
		fPatterns = newPatterns;
		fMatchers = new StringMatcher[newPatterns.length];
		for (int i = 0; i < newPatterns.length; i++) {
			//Reset the matchers to prevent constructor overhead
			fMatchers[i]= new StringMatcher(newPatterns[i], true, false);
		}
	}
}