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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) 2012, 2020 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.osgi.container;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.osgi.framework.namespace.NativeNamespace;
import org.osgi.framework.wiring.BundleCapability;

/**
 * An implementation of {@link BundleCapability}.
 * @since 3.10
 */
public final class ModuleCapability implements BundleCapability {
	private final String namespace;
	private final Map directives;
	private final Map attributes;
	private final Map transientAttrs;
	private final ModuleRevision revision;

	ModuleCapability(String namespace, Map directives, Map attributes, ModuleRevision revision) {
		this.namespace = namespace;
		this.directives = directives;
		this.attributes = attributes;
		this.transientAttrs = NativeNamespace.NATIVE_NAMESPACE.equals(namespace) ? new HashMap<>(0) : null;
		this.revision = revision;
	}

	@Override
	public ModuleRevision getRevision() {
		return revision;
	}

	@Override
	public String getNamespace() {
		return namespace;
	}

	@Override
	public Map getDirectives() {
		return directives;
	}

	@Override
	public Map getAttributes() {
		if (transientAttrs == null)
			return attributes;
		Map result = new HashMap<>(transientAttrs);
		result.putAll(attributes);
		return Collections.unmodifiableMap(result);
	}

	Map getPersistentAttributes() {
		return attributes;
	}

	/**
	 * Only used by the system module for setting transient attributes associated
	 * with the {@link NativeNamespace osgi.native} namespace.
	 * @param transientAttrs
	 */
	public void setTransientAttrs(Map transientAttrs) {
		if (this.transientAttrs == null) {
			throw new UnsupportedOperationException(namespace + ": namespace does not support transient attributes."); //$NON-NLS-1$
		}
		if (!(getResource().getRevisions().getModule() instanceof SystemModule)) {
			throw new UnsupportedOperationException("Only allowed to set transient attributes for the system module: " + getResource()); //$NON-NLS-1$
		}
		this.transientAttrs.clear();
		this.transientAttrs.putAll(transientAttrs);
	}

	@Override
	public ModuleRevision getResource() {
		return revision;
	}

	@Override
	public String toString() {
		return namespace + ModuleRevision.toString(attributes, false) + ModuleRevision.toString(directives, true);
	}
}