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The AspectJ weaver introduces advices to java classes
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001, 2017 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* vec = new ArrayList();
for (StringTokenizer tok = new StringTokenizer(class_path, System.getProperty("path.separator")); tok
.hasMoreTokens();) {
String path = tok.nextToken();
if (!path.equals("")) {
File file = new File(path);
try {
if (file.exists()) {
if (file.isDirectory()) {
vec.add(new Dir(path));
} else if (file.getName().endsWith("jrt-fs.jar")) { // TODO a bit crude...
vec.add(new JImage());
} else {
vec.add(new Zip(new ZipFile(file)));
}
}
} catch (IOException e) {
System.err.println("CLASSPATH component " + file + ": " + e);
}
}
}
paths = new PathEntry[vec.size()];
vec.toArray(paths);
}
/**
* Search for classes in CLASSPATH.
*
* @deprecated Use SYSTEM_CLASS_PATH constant
*/
@Deprecated
public ClassPath() {
this(getClassPath());
}
/**
* @return used class path string
*/
@Override
public String toString() {
return class_path;
}
@Override
public int hashCode() {
return class_path.hashCode();
}
@Override
public boolean equals(Object o) {
if (o instanceof ClassPath) {
return class_path.equals(((ClassPath) o).class_path);
}
return false;
}
private static final void getPathComponents(String path, ArrayList list) {
if (path != null) {
StringTokenizer tok = new StringTokenizer(path, File.pathSeparator);
while (tok.hasMoreTokens()) {
String name = tok.nextToken();
File file = new File(name);
if (file.exists())
list.add(name);
}
}
}
/**
* Checks for class path components in the following properties:
* "java.class.path", "sun.boot.class.path", "java.ext.dirs"
*
* @return class path as used by default by BCEL
*/
public static final String getClassPath() {
String class_path = System.getProperty("java.class.path");
String boot_path = System.getProperty("sun.boot.class.path");
String ext_path = System.getProperty("java.ext.dirs");
String vm_version = System.getProperty("java.version");
ArrayList list = new ArrayList();
getPathComponents(class_path, list);
getPathComponents(boot_path, list);
ArrayList dirs = new ArrayList();
getPathComponents(ext_path, dirs);
for (Iterator e = dirs.iterator(); e.hasNext();) {
File ext_dir = new File(e.next());
String[] extensions = ext_dir.list(new FilenameFilter() {
@Override
public boolean accept(File dir, String name) {
name = name.toLowerCase();
return name.endsWith(".zip") || name.endsWith(".jar");
}
});
if (extensions != null)
for (int i = 0; i < extensions.length; i++)
list.add(ext_path + File.separatorChar + extensions[i]);
}
StringBuffer buf = new StringBuffer();
for (Iterator e = list.iterator(); e.hasNext();) {
buf.append(e.next());
if (e.hasNext())
buf.append(File.pathSeparatorChar);
}
// On Java9 the sun.boot.class.path won't be set. System classes accessible through JRT filesystem
if (vm_version.startsWith("9") || vm_version.startsWith("10") || vm_version.startsWith("11")) {
buf.insert(0, File.pathSeparatorChar);
buf.insert(0, System.getProperty("java.home") + File.separator + "lib" + File.separator + JRT_FS);
}
return buf.toString().intern();
}
/**
* @param name
* fully qualified class name, e.g. java.lang.String
* @return input stream for class
*/
public InputStream getInputStream(String name) throws IOException {
return getInputStream(name, ".class");
}
/**
* Return stream for class or resource on CLASSPATH.
*
* @param name
* fully qualified file name, e.g. java/lang/String
* @param suffix
* file name ends with suff, e.g. .java
* @return input stream for file on class path
*/
public InputStream getInputStream(String name, String suffix) throws IOException {
InputStream is = null;
try {
is = getClass().getClassLoader().getResourceAsStream(name + suffix);
} catch (Exception e) {
}
if (is != null)
return is;
return getClassFile(name, suffix).getInputStream();
}
/**
* @param name
* fully qualified file name, e.g. java/lang/String
* @param suffix
* file name ends with suff, e.g. .java
* @return class file for the java class
*/
public ClassFile getClassFile(String name, String suffix) throws IOException {
for (int i = 0; i < paths.length; i++) {
ClassFile cf;
if ((cf = paths[i].getClassFile(name, suffix)) != null)
return cf;
}
throw new IOException("Couldn't find: " + name + suffix);
}
/**
* @param name
* fully qualified class name, e.g. java.lang.String
* @return input stream for class
*/
public ClassFile getClassFile(String name) throws IOException {
return getClassFile(name, ".class");
}
/**
* @param name
* fully qualified file name, e.g. java/lang/String
* @param suffix
* file name ends with suffix, e.g. .java
* @return byte array for file on class path
*/
public byte[] getBytes(String name, String suffix) throws IOException {
InputStream is = getInputStream(name, suffix);
if (is == null)
throw new IOException("Couldn't find: " + name + suffix);
DataInputStream dis = new DataInputStream(is);
byte[] bytes = new byte[is.available()];
dis.readFully(bytes);
dis.close();
is.close();
return bytes;
}
/**
* @return byte array for class
*/
public byte[] getBytes(String name) throws IOException {
return getBytes(name, ".class");
}
/**
* @param name
* name of file to search for, e.g. java/lang/String.java
* @return full (canonical) path for file
*/
public String getPath(String name) throws IOException {
int index = name.lastIndexOf('.');
String suffix = "";
if (index > 0) {
suffix = name.substring(index);
name = name.substring(0, index);
}
return getPath(name, suffix);
}
/**
* @param name
* name of file to search for, e.g. java/lang/String
* @param suffix
* file name suffix, e.g. .java
* @return full (canonical) path for file, if it exists
*/
public String getPath(String name, String suffix) throws IOException {
return getClassFile(name, suffix).getPath();
}
private static abstract class PathEntry implements Serializable {
abstract ClassFile getClassFile(String name, String suffix) throws IOException;
}
/**
* Contains information about file/ZIP entry of the Java class.
*/
public interface ClassFile {
/**
* @return input stream for class file.
*/
public abstract InputStream getInputStream() throws IOException;
/**
* @return canonical path to class file.
*/
public abstract String getPath();
/**
* @return base path of found class, i.e. class is contained relative to
* that path, which may either denote a directory, or zip file
*/
public abstract String getBase();
/**
* @return modification time of class file.
*/
public abstract long getTime();
/**
* @return size of class file.
*/
public abstract long getSize();
}
private static class Dir extends PathEntry {
private String dir;
Dir(String d) {
dir = d;
}
@Override
ClassFile getClassFile(String name, String suffix) throws IOException {
final File file = new File(dir + File.separatorChar + name.replace('.', File.separatorChar) + suffix);
return file.exists() ? new ClassFile() {
@Override
public InputStream getInputStream() throws IOException {
return new FileInputStream(file);
}
@Override
public String getPath() {
try {
return file.getCanonicalPath();
} catch (IOException e) {
return null;
}
}
@Override
public long getTime() {
return file.lastModified();
}
@Override
public long getSize() {
return file.length();
}
@Override
public String getBase() {
return dir;
}
} : null;
}
@Override
public String toString() {
return dir;
}
}
private static class JImage extends PathEntry {
private static URI JRT_URI = URI.create("jrt:/"); //$NON-NLS-1$
private static String MODULES_PATH = "modules"; //$NON-NLS-1$
private static String JAVA_BASE_PATH = "java.base"; //$NON-NLS-1$
private java.nio.file.FileSystem fs;
private final Map fileMap;
JImage() {
fs = FileSystems.getFileSystem(JRT_URI);
fileMap = buildFileMap();
}
private Map buildFileMap() {
final Map fileMap = new HashMap<>();
final java.nio.file.PathMatcher matcher = fs.getPathMatcher("glob:*.class");
Iterable roots = fs.getRootDirectories();
for (java.nio.file.Path path : roots) {
try {
Files.walkFileTree(path, new SimpleFileVisitor() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
if (file.getNameCount() > 2
&& matcher.matches(file.getFileName())) {
Path classPath = file.subpath(2, file.getNameCount());
fileMap.put(classPath.toString(), file);
}
return FileVisitResult.CONTINUE;
}
});
}
catch (IOException e) {
throw new RuntimeException(e);
}
}
return fileMap;
}
private static class ByteBasedClassFile implements ClassFile {
private byte[] bytes;
private ByteArrayInputStream bais;
private String path;
private String base;
private long time;
private long size;
public ByteBasedClassFile(byte[] bytes, String path, String base, long time, long size) {
this.bytes = bytes;
this.path = path;
this.base = base;
this.time = time;
this.size = size;
}
@Override
public InputStream getInputStream() throws IOException {
// TODO too costly to keep these in inflated form in memory?
this.bais = new ByteArrayInputStream(bytes);
return this.bais;
}
@Override
public String getPath() {
return this.path;
}
@Override
public String getBase() {
return this.base;
}
@Override
public long getTime() {
return this.time;
}
@Override
public long getSize() {
return this.size;
}
}
@Override
ClassFile getClassFile(String name, String suffix) throws IOException {
// Class files are in here under names like this:
// /modules/java.base/java/lang/Object.class (jdk9 b74)
// so within a modules top level qualifier and then the java.base module
String fileName = name.replace('.', '/') + suffix;
Path p = fileMap.get(fileName);
if (p == null) {
return null;
}
byte[] bs = Files.readAllBytes(p);
BasicFileAttributeView bfav = Files.getFileAttributeView(p, BasicFileAttributeView.class);
BasicFileAttributes bfas = bfav.readAttributes();
long time = bfas.lastModifiedTime().toMillis();
long size = bfas.size();
ClassFile cf = new ByteBasedClassFile(bs, "jimage",fileName,time,size);
return cf;
}
}
private static class Zip extends PathEntry {
private ZipFile zip;
Zip(ZipFile z) {
zip = z;
}
@Override
ClassFile getClassFile(String name, String suffix) throws IOException {
final ZipEntry entry = zip.getEntry(name.replace('.', '/') + suffix);
return (entry != null) ? new ClassFile() {
@Override
public InputStream getInputStream() throws IOException {
return zip.getInputStream(entry);
}
@Override
public String getPath() {
return entry.toString();
}
@Override
public long getTime() {
return entry.getTime();
}
@Override
public long getSize() {
return entry.getSize();
}
@Override
public String getBase() {
return zip.getName();
}
} : null;
}
}
}