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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) 2002 Palo Alto Research Center, Incorporated (PARC).
 * 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
 *
 * Contributors:
 *     PARC     initial implementation
 * ******************************************************************/

package org.aspectj.weaver.patterns;

import java.io.IOException;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;

import org.aspectj.weaver.CompressingDataOutputStream;
import org.aspectj.weaver.VersionedDataInputStream;

public class ModifiersPattern extends PatternNode {
	private int requiredModifiers;
	private int forbiddenModifiers;

	public static final ModifiersPattern ANY = new ModifiersPattern(0, 0);

	private static Map modifierFlags = null;

	static {
		modifierFlags = new HashMap<>();
		int flag = 1;
		while (flag <= Modifier.STRICT) {
			String flagName = Modifier.toString(flag);
			modifierFlags.put(flagName, flag);
			flag = flag << 1;
		}
		/* Modifier.SYNTHETIC */
		modifierFlags.put("synthetic", 0x1000);
	}

	public ModifiersPattern(int requiredModifiers, int forbiddenModifiers) {
		this.requiredModifiers = requiredModifiers;
		this.forbiddenModifiers = forbiddenModifiers;
	}

	public String toString() {
		if (this == ANY) {
			return "";
		}

		String ret = Modifier.toString(requiredModifiers);
		if (forbiddenModifiers == 0) {
			return ret;
		} else {
			return ret + " !" + Modifier.toString(forbiddenModifiers);
		}
	}

	public boolean equals(Object other) {
		if (!(other instanceof ModifiersPattern)) {
			return false;
		}
		ModifiersPattern o = (ModifiersPattern) other;
		return o.requiredModifiers == this.requiredModifiers && o.forbiddenModifiers == this.forbiddenModifiers;
	}

	public int hashCode() {
		int result = 17;
		result = 37 * result + requiredModifiers;
		result = 37 * result + forbiddenModifiers;
		return result;
	}

	public boolean matches(int modifiers) {
		return ((modifiers & requiredModifiers) == requiredModifiers) && ((modifiers & forbiddenModifiers) == 0);
	}

	public static ModifiersPattern read(VersionedDataInputStream s) throws IOException {
		int requiredModifiers = s.readShort();
		int forbiddenModifiers = s.readShort();
		if (requiredModifiers == 0 && forbiddenModifiers == 0) {
			return ANY;
		}
		return new ModifiersPattern(requiredModifiers, forbiddenModifiers);
	}

	public void write(CompressingDataOutputStream s) throws IOException {
		// s.writeByte(MODIFIERS_PATTERN);
		s.writeShort(requiredModifiers);
		s.writeShort(forbiddenModifiers);
	}

	public static int getModifierFlag(String name) {
		Integer flag = modifierFlags.get(name);
		if (flag == null) {
			return -1;
		}
		return flag;
	}

	public Object accept(PatternNodeVisitor visitor, Object data) {
		return visitor.visit(this, data);
	}
}