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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.
/* *******************************************************************
* Copyright (c) 1999-2001 Xerox Corporation,
* 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:
* Xerox/PARC initial implementation
* ******************************************************************/
package org.aspectj.runtime.reflect;
import org.aspectj.lang.Signature;
import java.util.StringTokenizer;
abstract class SignatureImpl implements Signature {
private static boolean useCache = true;
int modifiers = -1;
String name;
String declaringTypeName;
Class declaringType;
Cache stringCache;
SignatureImpl(int modifiers, String name, Class declaringType) {
this.modifiers = modifiers;
this.name = name;
this.declaringType = declaringType;
}
protected abstract String createToString (StringMaker sm);
/* Use a soft cache for the short, middle and long String representations */
String toString (StringMaker sm) {
String result = null;
if (useCache) {
if (stringCache == null) {
try {
stringCache = new CacheImpl();
} catch (Throwable t) {
useCache = false;
}
} else {
result = stringCache.get(sm.cacheOffset);
}
}
if (result == null) {
result = createToString(sm);
}
if (useCache) {
stringCache.set(sm.cacheOffset, result);
}
return result;
}
public final String toString() { return toString(StringMaker.middleStringMaker); }
public final String toShortString() { return toString(StringMaker.shortStringMaker); }
public final String toLongString() { return toString(StringMaker.longStringMaker); }
public int getModifiers() {
if (modifiers == -1) modifiers = extractInt(0);
return modifiers;
}
public String getName() {
if (name == null) name = extractString(1);
return name;
}
public Class getDeclaringType() {
if (declaringType == null) declaringType = extractType(2);
return declaringType;
}
public String getDeclaringTypeName() {
if (declaringTypeName == null) {
declaringTypeName = getDeclaringType().getName();
}
return declaringTypeName;
}
String fullTypeName(Class type) {
if (type == null) return "ANONYMOUS";
if (type.isArray()) return fullTypeName(type.getComponentType()) + "[]";
return type.getName().replace('$', '.');
}
String stripPackageName(String name) {
int dot = name.lastIndexOf('.');
if (dot == -1) return name;
return name.substring(dot+1);
}
String shortTypeName(Class type) {
if (type == null) return "ANONYMOUS";
if (type.isArray()) return shortTypeName(type.getComponentType()) + "[]";
return stripPackageName(type.getName()).replace('$', '.');
}
void addFullTypeNames(StringBuffer buf, Class[] types) {
for (int i = 0; i < types.length; i++) {
if (i > 0) buf.append(", ");
buf.append(fullTypeName(types[i]));
}
}
void addShortTypeNames(StringBuffer buf, Class[] types) {
for (int i = 0; i < types.length; i++) {
if (i > 0) buf.append(", ");
buf.append(shortTypeName(types[i]));
}
}
void addTypeArray(StringBuffer buf, Class[] types) {
addFullTypeNames(buf, types);
}
// lazy version
private String stringRep;
ClassLoader lookupClassLoader = null;
public void setLookupClassLoader(ClassLoader loader) {
this.lookupClassLoader = loader;
}
private ClassLoader getLookupClassLoader() {
if (lookupClassLoader == null) lookupClassLoader = this.getClass().getClassLoader();
return lookupClassLoader;
}
public SignatureImpl(String stringRep) {
this.stringRep = stringRep;
}
static final char SEP = '-';
String extractString(int n) {
//System.out.println(n + ": from " + stringRep);
int startIndex = 0;
int endIndex = stringRep.indexOf(SEP);
while (n-- > 0) {
startIndex = endIndex+1;
endIndex = stringRep.indexOf(SEP, startIndex);
}
if (endIndex == -1) endIndex = stringRep.length();
//System.out.println(" " + stringRep.substring(startIndex, endIndex));
return stringRep.substring(startIndex, endIndex);
}
int extractInt(int n) {
String s = extractString(n);
return Integer.parseInt(s, 16);
}
Class extractType(int n) {
String s = extractString(n);
return Factory.makeClass(s,getLookupClassLoader());
}
static String[] EMPTY_STRING_ARRAY = new String[0];
static Class[] EMPTY_CLASS_ARRAY = new Class[0];
static final String INNER_SEP = ":";
String[] extractStrings(int n) {
String s = extractString(n);
StringTokenizer st = new StringTokenizer(s, INNER_SEP);
final int N = st.countTokens();
String[] ret = new String[N];
for (int i = 0; i < N; i++) ret[i]= st.nextToken();
return ret;
}
Class[] extractTypes(int n) {
String s = extractString(n);
StringTokenizer st = new StringTokenizer(s, INNER_SEP);
final int N = st.countTokens();
Class[] ret = new Class[N];
for (int i = 0; i < N; i++) ret[i]= Factory.makeClass(st.nextToken(),getLookupClassLoader());
return ret;
}
/*
* Used for testing
*/
static void setUseCache (boolean b) {
useCache = b;
}
static boolean getUseCache () {
return useCache;
}
private interface Cache {
String get(int cacheOffset);
void set(int cacheOffset, String result);
}
// separate implementation so we don't need SoftReference to hold the field...
private static final class CacheImpl implements Cache {
private java.lang.ref.SoftReference toStringCacheRef;
public CacheImpl() {
makeCache();
}
public String get(int cacheOffset) {
String[] cachedArray = array();
if (cachedArray == null) {
return null;
}
return cachedArray[cacheOffset];
}
public void set(int cacheOffset, String result) {
String[] cachedArray = array();
if (cachedArray == null) {
cachedArray = makeCache();
}
cachedArray[cacheOffset] = result;
}
private String[] array() {
return toStringCacheRef.get();
}
private String[] makeCache() {
String[] array = new String[3];
toStringCacheRef = new java.lang.ref.SoftReference<>(array);
return array;
}
}
}