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

public class NamePattern extends PatternNode {
	char[] pattern;
	int starCount = 0;
	private int hashcode = -1;

	public static final NamePattern ELLIPSIS = new NamePattern("");
	public static final NamePattern ANY = new NamePattern("*");

	public NamePattern(String name) {
		this(name.toCharArray());
	}

	public NamePattern(char[] pattern) {
		this.pattern = pattern;

		for (char c : pattern) {
			if (c == '*') {
				starCount++;
			}
		}
		hashcode = new String(pattern).hashCode();
	}

	public boolean matches(char[] a2) {
		char[] a1 = pattern;
		int len1 = a1.length;
		int len2 = a2.length;
		if (starCount == 0) {
			if (len1 != len2) {
				return false;
			}
			for (int i = 0; i < len1; i++) {
				if (a1[i] != a2[i]) {
					return false;
				}
			}
			return true;
		} else if (starCount == 1) {
			// just '*' matches anything
			if (len1 == 1) {
				return true;
			}
			if (len1 > len2 + 1) {
				return false;
			}
			int i2 = 0;
			for (int i1 = 0; i1 < len1; i1++) {
				char c1 = a1[i1];
				if (c1 == '*') {
					i2 = len2 - (len1 - (i1 + 1));
				} else if (c1 != a2[i2++]) {
					return false;
				}
			}
			return true;
		} else {
			// System.err.print("match(\"" + pattern + "\", \"" + target + "\") -> ");
			boolean b = outOfStar(a1, a2, 0, 0, len1 - starCount, len2, starCount);
			// System.err.println(b);
			return b;
		}
	}

	private static boolean outOfStar(final char[] pattern, final char[] target, int pi, int ti, int pLeft, int tLeft,
			final int starsLeft) {
		if (pLeft > tLeft) {
			return false;
		}
		while (true) {
			// invariant: if (tLeft > 0) then (ti < target.length && pi < pattern.length)
			if (tLeft == 0) {
				return true;
			}
			if (pLeft == 0) {
				return (starsLeft > 0);
			}
			if (pattern[pi] == '*') {
				return inStar(pattern, target, pi + 1, ti, pLeft, tLeft, starsLeft - 1);
			}
			if (target[ti] != pattern[pi]) {
				return false;
			}
			pi++;
			ti++;
			pLeft--;
			tLeft--;
		}
	}

	private static boolean inStar(final char[] pattern, final char[] target, int pi, int ti, final int pLeft, int tLeft,
			int starsLeft) {
		// invariant: pLeft > 0, so we know we'll run out of stars and find a real char in pattern
		char patternChar = pattern[pi];
		while (patternChar == '*') {
			starsLeft--;
			patternChar = pattern[++pi];
		}
		while (true) {
			// invariant: if (tLeft > 0) then (ti < target.length)
			if (pLeft > tLeft) {
				return false;
			}
			if (target[ti] == patternChar) {
				if (outOfStar(pattern, target, pi + 1, ti + 1, pLeft - 1, tLeft - 1, starsLeft)) {
					return true;
				}
			}
			ti++;
			tLeft--;
		}
	}

	public boolean matches(String other) {
		if (starCount == 1 && pattern.length == 1) {
			// optimize for wildcard
			return true;
		}
		return matches(other.toCharArray());
	}

	@Override
	public String toString() {
		return new String(pattern);
	}

	@Override
	public boolean equals(Object other) {
		if (other instanceof NamePattern) {
			NamePattern otherPat = (NamePattern) other;
			if (otherPat.starCount != this.starCount) {
				return false;
			}
			if (otherPat.pattern.length != this.pattern.length) {
				return false;
			}
			for (int i = 0; i < this.pattern.length; i++) {
				if (this.pattern[i] != otherPat.pattern[i]) {
					return false;
				}
			}
			return true;
		}
		return false;
	}

	@Override
	public int hashCode() {
		return hashcode;
	}

	@Override
	public void write(CompressingDataOutputStream out) throws IOException {
		out.writeUTF(new String(pattern));
	}

	public static NamePattern read(VersionedDataInputStream in) throws IOException {
		String s = in.readUTF();
		if (s.length() == 0) {
			return ELLIPSIS;
		}
		return new NamePattern(s);
	}

	/**
	 * Method maybeGetSimpleName.
	 *
	 * @return String
	 */
	public String maybeGetSimpleName() {
		if (starCount == 0 && pattern.length > 0) {
			return new String(pattern);
		}
		return null;
	}

	/**
	 * Method isAny.
	 *
	 * @return boolean
	 */
	public boolean isAny() {
		return starCount == 1 && pattern.length == 1;
	}

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