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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) 2000, 2015 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
 *     James Blackburn (Broadcom Corp.) - ongoing development
 *     Lars Vogel  - Bug 473427
 *******************************************************************************/
package org.eclipse.core.internal.resources;

import java.util.ArrayList;
import org.eclipse.core.internal.utils.Messages;
import org.eclipse.core.resources.IProjectNatureDescriptor;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.*;
import org.eclipse.osgi.util.NLS;

/**
 */
public class ProjectNatureDescriptor implements IProjectNatureDescriptor {
	protected String id;
	protected String label;
	protected String[] requiredNatures;
	protected String[] natureSets;
	protected String[] builderIds;
	protected String[] contentTypeIds;
	protected boolean allowLinking = true;

	//descriptors that are in a dependency cycle are never valid
	protected boolean hasCycle = false;
	//colours used by cycle detection algorithm
	protected byte colour = 0;

	/**
	 * Creates a new descriptor based on the given extension markup.
	 * @exception CoreException if the given nature extension is not correctly formed.
	 */
	protected ProjectNatureDescriptor(IExtension natureExtension) throws CoreException {
		readExtension(natureExtension);
	}

	protected void fail() throws CoreException {
		fail(NLS.bind(Messages.natures_invalidDefinition, id));
	}

	protected void fail(String reason) throws CoreException {
		throw new ResourceException(new Status(IStatus.ERROR, ResourcesPlugin.PI_RESOURCES, 1, reason, null));
	}

	/**
	 * Returns the IDs of the incremental builders that this nature claims to
	 * own.  These builders do not necessarily exist in the registry.
	 */
	public String[] getBuilderIds() {
		return builderIds;
	}

	/**
	 * Returns the IDs of the content types this nature declares to
	 * have affinity with.  These content types do not necessarily exist in the registry.
	 */
	public String[] getContentTypeIds() {
		return contentTypeIds;
	}

	/**
	 * @see IProjectNatureDescriptor#getNatureId()
	 */
	@Override
	public String getNatureId() {
		return id;
	}

	/**
	 * @see IProjectNatureDescriptor#getLabel()
	 */
	@Override
	public String getLabel() {
		return label;
	}

	/**
	 * @see IProjectNatureDescriptor#getRequiredNatureIds()
	 */
	@Override
	public String[] getRequiredNatureIds() {
		return requiredNatures;
	}

	/**
	 * @see IProjectNatureDescriptor#getNatureSetIds()
	 */
	@Override
	public String[] getNatureSetIds() {
		return natureSets;
	}

	/**
	 * @see IProjectNatureDescriptor#isLinkingAllowed()
	 */
	@Override
	public boolean isLinkingAllowed() {
		return allowLinking;
	}

	/**
	 * Initialize this nature descriptor based on the provided extension point.
	 */
	protected void readExtension(IExtension natureExtension) throws CoreException {
		//read the extension
		id = natureExtension.getUniqueIdentifier();
		if (id == null) {
			fail(Messages.natures_missingIdentifier);
		}
		label = natureExtension.getLabel();
		IConfigurationElement[] elements = natureExtension.getConfigurationElements();
		int count = elements.length;
		ArrayList requiredList = new ArrayList<>(count);
		ArrayList setList = new ArrayList<>(count);
		ArrayList builderList = new ArrayList<>(count);
		ArrayList contentTypeList = new ArrayList<>(count);
		for (int i = 0; i < count; i++) {
			IConfigurationElement element = elements[i];
			String name = element.getName();
			if (name.equalsIgnoreCase("requires-nature")) { //$NON-NLS-1$
				String attribute = element.getAttribute("id"); //$NON-NLS-1$
				if (attribute == null)
					fail();
				requiredList.add(attribute);
			} else if (name.equalsIgnoreCase("one-of-nature")) { //$NON-NLS-1$
				String attribute = element.getAttribute("id"); //$NON-NLS-1$
				if (attribute == null)
					fail();
				setList.add(attribute);
			} else if (name.equalsIgnoreCase("builder")) { //$NON-NLS-1$
				String attribute = element.getAttribute("id"); //$NON-NLS-1$
				if (attribute == null)
					fail();
				builderList.add(attribute);
			} else if (name.equalsIgnoreCase("content-type")) { //$NON-NLS-1$
				String attribute = element.getAttribute("id"); //$NON-NLS-1$
				if (attribute == null)
					fail();
				contentTypeList.add(attribute);
			} else if (name.equalsIgnoreCase("options")) { //$NON-NLS-1$
				String attribute = element.getAttribute("allowLinking"); //$NON-NLS-1$
				//when in doubt (missing attribute, wrong value) default to allow linking
				allowLinking = !Boolean.FALSE.toString().equalsIgnoreCase(attribute);
			}
		}
		requiredNatures = requiredList.toArray(new String[requiredList.size()]);
		natureSets = setList.toArray(new String[setList.size()]);
		builderIds = builderList.toArray(new String[builderList.size()]);
		contentTypeIds = contentTypeList.toArray(new String[contentTypeList.size()]);
	}

	/**
	 * Prints out a string representation for debugging purposes only.
	 */
	@Override
	public String toString() {
		return "ProjectNatureDescriptor(" + id + ")"; //$NON-NLS-1$ //$NON-NLS-2$
	}
}