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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2004, 2014 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.core.resources;

import org.eclipse.core.internal.preferences.AbstractScope;
import org.eclipse.core.internal.preferences.EclipsePreferences;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.eclipse.core.runtime.preferences.IPreferencesService;
import org.osgi.service.prefs.Preferences;

/**
 * Object representing the project scope in the Eclipse preferences
 * hierarchy. Can be used as a context for searching for preference
 * values (in the org.eclipse.core.runtime.IPreferencesService
 * APIs) or for determining the correct preference node to set values in the store.
 * 
 * Project preferences are stored on a per project basis in the
 * project's content area as specified by IProject#getLocation.
 * 

 * The path for preferences defined in the project scope hierarchy
 * is as follows: /project/<projectName>/<qualifier>
 * 
 * 
 * This class is not intended to be subclassed. This class may be instantiated.
 * 
 * @see IProject#getLocation()
 * @since 3.0
 */
public final class ProjectScope extends AbstractScope {
	/**
	 * String constant (value of "project") used for the scope name
	 * for this preference scope.
	 */
	public static final String SCOPE = "project"; //$NON-NLS-1$

	private final IProject project;

	/**
	 * Create and return a new project scope for the given project. The given
	 * project must not be null.
	 *
	 * @param context the project
	 * @exception IllegalArgumentException if the project is null
	 */
	public ProjectScope(IProject context) {
		super();
		if (context == null)
			throw new IllegalArgumentException();
		this.project = context;
	}

	@Override
	public IEclipsePreferences getNode(String qualifier) {
		if (qualifier == null)
			throw new IllegalArgumentException();
		IPreferencesService preferencesService = Platform.getPreferencesService();
		Preferences scopeNode = preferencesService.getRootNode().node(SCOPE);
		Preferences projectNode = scopeNode.node(project.getName());
		return (IEclipsePreferences) projectNode.node(qualifier);
	}

	@Override
	public IPath getLocation() {
		IPath location = project.getLocation();
		return location == null ? null : location.append(EclipsePreferences.DEFAULT_PREFERENCES_DIRNAME);
	}

	@Override
	public String getName() {
		return SCOPE;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (!super.equals(obj))
			return false;
		if (!(obj instanceof ProjectScope))
			return false;
		ProjectScope other = (ProjectScope) obj;
		return project.equals(other.project);
	}

	@Override
	public int hashCode() {
		return super.hashCode() * 31 + project.getFullPath().hashCode();
	}
}