/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.search.core.text;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceProxy;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.MultiStatus;
import org.eclipse.search.internal.core.text.FileNamePatternSearchScope;
import org.eclipse.search.internal.core.text.FilesOfScopeCalculator;

import java.util.regex.Pattern;

/**
 * A {@link TextSearchScope} defines the scope of a search. The scope consists of all workbench resources that are accepted
 * by {@link #contains(IResourceProxy)} and that either are a root element ({@link #getRoots()}) or have a root element
 * in their parent chain.
 *
 * @see #newSearchScope(IResource[], Pattern, boolean)
 * @since 3.2
 */
public abstract class TextSearchScope {


	/**
	 * Creates a scope that consists of all files that match the <code>fileNamePattern</code> and that
	 * either are one of the roots, or have one of the roots in their parent chain.
	 * If <code>visitDerivedResources</code> is not enabled, all files that are marked derived or
	 * have a derived container in their parent chain are not part of the scope.
	 *
	 * @param rootResources the resources that are the roots of the scope
	 * @param fileNamePattern file name pattern for this scope.
	 * @param visitDerivedResources if set also derived folders and files are searched.
	 * @return a scope the search scope
	 */
	public static TextSearchScope newSearchScope(IResource[] rootResources, Pattern fileNamePattern, boolean visitDerivedResources) {
		FileNamePatternSearchScope scope= FileNamePatternSearchScope.newSearchScope(new String(), rootResources, visitDerivedResources);
		scope.setFileNamePattern(fileNamePattern);
		return scope;
	}


	/**
	 * Returns the resources that form the root. Roots can not contain each other. Root elements are only part of the
	 * scope if they are also accepted by {@link #contains(IResourceProxy)}.
	 *
	 * @return returns the set of root resources. The default behavior is to return the workspace root.
	 */
	public IResource[] getRoots() {
		return new IResource[] { ResourcesPlugin.getWorkspace().getRoot() };
	}

	/**
	 * Returns if a given resource is part of the scope. If a container is not part of the scope, also all its members
	 * are not part of the scope.
	 *
	 * @param proxy the resource proxy to test.
	 * @return returns <code>true</code> if a resource is part of the scope. if <code>false</code> is returned the resource
	 * and all its children are not part of the scope.
	 */
	public abstract boolean contains(IResourceProxy proxy);


	/**
	 * Evaluates all files in this scope.
	 *
	 * @param status a {@link MultiStatus} to collect the error status that occurred while collecting resources.
	 * @return returns the files in the scope.
	 */
	public IFile[] evaluateFilesInScope(MultiStatus status) {
		return new FilesOfScopeCalculator(this, status).process();
	}


}
