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The AspectJ weaver introduces advices to java classes
/* *******************************************************************
* 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 v1.0
* which accompanies this distribution and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* 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 static 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 (String[]) toStringCacheRef.get();
}
private String[] makeCache() {
String[] array = new String[3];
toStringCacheRef = new java.lang.ref.SoftReference(array);
return array;
}
}
}