org.aspectj.weaver.AbstractAnnotationAJ Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of aspectjweaver Show documentation
The AspectJ weaver introduces advices to java classes
There is a newer version: 1.9.22.1
/* *******************************************************************
 * Copyright (c) 2008 Contributors
 * 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 
 *  
 * ******************************************************************/
package org.aspectj.weaver;

import java.util.Collections;
import java.util.Iterator;
import java.util.Set;

public abstract class AbstractAnnotationAJ implements AnnotationAJ {

	protected final ResolvedType type;

	private Set supportedTargets = null; // @target meta annotation

	public AbstractAnnotationAJ(ResolvedType type) {
		this.type = type;
	}

	/**
	 * {@inheritDoc}
	 */
	public final ResolvedType getType() {
		return type;
	}

	/**
	 * {@inheritDoc}
	 */
	public final String getTypeSignature() {
		return type.getSignature();
	}

	/**
	 * {@inheritDoc}
	 */
	public final String getTypeName() {
		return type.getName();
	}

	/**
	 * {@inheritDoc}
	 */
	public final boolean allowedOnAnnotationType() {
		ensureAtTargetInitialized();
		if (supportedTargets.isEmpty()) {
			return true;
		}
		return supportedTargets.contains("ANNOTATION_TYPE");
	}

	/**
	 * {@inheritDoc}
	 */
	public final boolean allowedOnField() {
		ensureAtTargetInitialized();
		if (supportedTargets.isEmpty()) {
			return true;
		}
		return supportedTargets.contains("FIELD");
	}

	/**
	 * {@inheritDoc}
	 */
	public final boolean allowedOnRegularType() {
		ensureAtTargetInitialized();
		if (supportedTargets.isEmpty()) {
			return true;
		}
		return supportedTargets.contains("TYPE");
	}

	/**
	 * {@inheritDoc}
	 */
	public final void ensureAtTargetInitialized() {
		if (supportedTargets == null) {
			AnnotationAJ atTargetAnnotation = retrieveAnnotationOnAnnotation(UnresolvedType.AT_TARGET);
			if (atTargetAnnotation == null) {
				supportedTargets = Collections.emptySet();
			} else {
				supportedTargets = atTargetAnnotation.getTargets();
			}
		}
	}

	/**
	 * {@inheritDoc}
	 */
	public final String getValidTargets() {
		StringBuffer sb = new StringBuffer();
		sb.append("{");
		for (Iterator iter = supportedTargets.iterator(); iter.hasNext();) {
			String evalue = iter.next();
			sb.append(evalue);
			if (iter.hasNext()) {
				sb.append(",");
			}
		}
		sb.append("}");
		return sb.toString();
	}

	/**
	 * {@inheritDoc}
	 */
	public final boolean specifiesTarget() {
		ensureAtTargetInitialized();
		return !supportedTargets.isEmpty();
	}

	/**
	 * Helper method to retrieve an annotation on an annotation e.g. retrieveAnnotationOnAnnotation(UnresolvedType.AT_TARGET)
	 */
	private final AnnotationAJ retrieveAnnotationOnAnnotation(UnresolvedType requiredAnnotationSignature) {
		AnnotationAJ[] annos = type.getAnnotations();
		for (int i = 0; i < annos.length; i++) {
			AnnotationAJ a = annos[i];
			if (a.getTypeSignature().equals(requiredAnnotationSignature.getSignature())) {
				return annos[i];
			}
		}
		return null;
	}

	/**
	 * {@inheritDoc}
	 */
	public abstract boolean isRuntimeVisible();

	/**
	 * {@inheritDoc}
	 */
	public abstract Set getTargets();

	/**
	 * {@inheritDoc}
	 */
	public abstract boolean hasNameValuePair(String name, String value);

	/**
	 * {@inheritDoc}
	 */
	public abstract boolean hasNamedValue(String name);

	/**
	 * {@inheritDoc}
	 */
	public abstract String stringify();

}