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The AspectJ weaver introduces advices to java classes
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/* *******************************************************************
 * Copyright (c) 2008 Contributors
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * ******************************************************************/
package org.aspectj.weaver;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

/**
 * This type represents the weavers abstraction of an annotation - it is not tied to any underlying BCI toolkit. The weaver actualy
 * handles these through AnnotationX wrapper objects - until we start transforming the BCEL annotations into this form (expensive)
 * or offer a clever visitor mechanism over the BCEL annotation stuff that builds these annotation types directly.
 *
 * @author AndyClement
 */
public class StandardAnnotation extends AbstractAnnotationAJ {

	private final boolean isRuntimeVisible;

	private List nvPairs = null;

	public StandardAnnotation(ResolvedType type, boolean isRuntimeVisible) {
		super(type);
		this.isRuntimeVisible = isRuntimeVisible;
	}

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

	/**
	 * {@inheritDoc}
	 */
	public String stringify() {
		StringBuilder sb = new StringBuilder();
		sb.append("@").append(type.getClassName());
		if (hasNameValuePairs()) {
			sb.append("(");
			for (AnnotationNameValuePair nvPair : nvPairs) {
				sb.append(nvPair.stringify());
			}
			sb.append(")");
		}
		return sb.toString();
	}

	public String toString() {
		StringBuilder sb = new StringBuilder();
		sb.append("Anno[" + getTypeSignature() + " " + (isRuntimeVisible ? "rVis" : "rInvis"));
		if (nvPairs != null) {
			sb.append(" ");
			for (Iterator iter = nvPairs.iterator(); iter.hasNext();) {
				AnnotationNameValuePair element = iter.next();
				sb.append(element.toString());
				if (iter.hasNext()) {
					sb.append(",");
				}
			}
		}
		sb.append("]");
		return sb.toString();
	}

	/**
	 * {@inheritDoc}
	 */
	public boolean hasNamedValue(String n) {
		if (nvPairs == null) {
			return false;
		}
		for (AnnotationNameValuePair pair : nvPairs) {
			if (pair.getName().equals(n)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * {@inheritDoc}
	 */
	public boolean hasNameValuePair(String n, String v) {
		if (nvPairs == null) {
			return false;
		}
		for (AnnotationNameValuePair pair : nvPairs) {
			if (pair.getName().equals(n)) {
				if (pair.getValue().stringify().equals(v)) {
					return true;
				}
			}
		}
		return false;
	}

	/**
	 * {@inheritDoc}
	 */
	public Set getTargets() {
		if (!type.equals(UnresolvedType.AT_TARGET)) {
			return Collections.emptySet();
		}
		AnnotationNameValuePair nvp = nvPairs.get(0);
		ArrayAnnotationValue aav = (ArrayAnnotationValue) nvp.getValue();
		AnnotationValue[] avs = aav.getValues();
		Set targets = new HashSet<>();
		for (AnnotationValue av : avs) {
			EnumAnnotationValue value = (EnumAnnotationValue) av;
			targets.add(value.getValue());
		}
		return targets;
	}

	public List getNameValuePairs() {
		return nvPairs;
	}

	public boolean hasNameValuePairs() {
		return nvPairs != null && nvPairs.size() != 0;
	}

	public void addNameValuePair(AnnotationNameValuePair pair) {
		if (nvPairs == null) {
			nvPairs = new ArrayList<>();
		}
		nvPairs.add(pair);
	}

	/**
	 * {@inheritDoc}
	 */
	public String getStringFormOfValue(String name) {
		if (hasNameValuePairs()) {
			for (AnnotationNameValuePair nvPair : nvPairs) {
				if (nvPair.getName().equals(name)) {
					return nvPair.getValue().stringify();
				}
			}
		}
		return null;
	}
}