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The AspectJ weaver introduces advices to java classes
package org.aspectj.apache.bcel.classfile;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 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
* GJ
* attribute.
*
* @version $Id: Signature.java,v 1.11 2009/09/15 19:40:12 aclement Exp $
* @author M. Dahm
* @see Attribute
*/
public final class Signature extends Attribute {
private int signature_index;
/**
* Initialize from another object. Note that both objects use the same references (shallow copy). Use clone() for a physical
* copy.
*/
public Signature(Signature c) {
this(c.getNameIndex(), c.getLength(), c.getSignatureIndex(), c.getConstantPool());
}
/**
* Construct object from file stream.
*
* @param name_index Index in constant pool to CONSTANT_Utf8
* @param length Content length in bytes
* @param file Input stream
* @param constant_pool Array of constants
* @throws IOException
*/
Signature(int name_index, int length, DataInputStream file, ConstantPool constant_pool) throws IOException {
this(name_index, length, file.readUnsignedShort(), constant_pool);
}
/**
* @param name_index Index in constant pool to CONSTANT_Utf8
* @param length Content length in bytes
* @param constant_pool Array of constants
* @param Signature_index Index in constant pool to CONSTANT_Utf8
*/
public Signature(int name_index, int length, int signature_index, ConstantPool constant_pool) {
super(Constants.ATTR_SIGNATURE, name_index, length, constant_pool);
this.signature_index = signature_index;
}
/**
* Called by objects that are traversing the nodes of the tree implicitely defined by the contents of a Java class. I.e., the
* hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
*
* @param v Visitor object
*/
@Override
public void accept(ClassVisitor v) {
System.err.println("Visiting non-standard Signature object");
v.visitSignature(this);
}
/**
* Dump source file attribute to file stream in binary format.
*
* @param file Output file stream
* @throws IOException
*/
@Override
public final void dump(DataOutputStream file) throws IOException {
super.dump(file);
file.writeShort(signature_index);
}
/**
* @return Index in constant pool of source file name.
*/
public final int getSignatureIndex() {
return signature_index;
}
/**
* @param Signature_index.
*/
public final void setSignatureIndex(int signature_index) {
this.signature_index = signature_index;
}
/**
* @return GJ signature.
*/
public final String getSignature() {
ConstantUtf8 c = (ConstantUtf8) cpool.getConstant(signature_index, Constants.CONSTANT_Utf8);
return c.getValue();
}
/**
* Extends ByteArrayInputStream to make 'unreading' chars possible.
*/
private static final class MyByteArrayInputStream extends ByteArrayInputStream {
MyByteArrayInputStream(String data) {
super(data.getBytes());
}
final int mark() {
return pos;
}
final String getData() {
return new String(buf);
}
final void reset(int p) {
pos = p;
}
final void unread() {
if (pos > 0)
pos--;
}
}
private static boolean identStart(int ch) {
return ch == 'T' || ch == 'L';
}
private static final void matchIdent(MyByteArrayInputStream in, StringBuffer buf) {
int ch;
if ((ch = in.read()) == -1)
throw new RuntimeException("Illegal signature: " + in.getData() + " no ident, reaching EOF");
// System.out.println("return from ident:" + (char)ch);
if (!identStart(ch)) {
StringBuffer buf2 = new StringBuffer();
int count = 1;
while (Character.isJavaIdentifierPart((char) ch)) {
buf2.append((char) ch);
count++;
ch = in.read();
}
if (ch == ':') { // Ok, formal parameter
in.skip("Ljava/lang/Object".length());
buf.append(buf2);
ch = in.read();
in.unread();
// System.out.println("so far:" + buf2 + ":next:" +(char)ch);
} else {
for (int i = 0; i < count; i++)
in.unread();
}
return;
}
StringBuffer buf2 = new StringBuffer();
ch = in.read();
do {
buf2.append((char) ch);
ch = in.read();
// System.out.println("within ident:"+ (char)ch);
} while ((ch != -1) && (Character.isJavaIdentifierPart((char) ch) || (ch == '/')));
buf.append(buf2.toString().replace('/', '.'));
// System.out.println("regular return ident:"+ (char)ch + ":" + buf2);
if (ch != -1)
in.unread();
}
private static final void matchGJIdent(MyByteArrayInputStream in, StringBuffer buf) {
int ch;
matchIdent(in, buf);
ch = in.read();
if ((ch == '<') || ch == '(') { // Parameterized or method
// System.out.println("Enter <");
buf.append((char) ch);
matchGJIdent(in, buf);
while (((ch = in.read()) != '>') && (ch != ')')) { // List of parameters
if (ch == -1)
throw new RuntimeException("Illegal signature: " + in.getData() + " reaching EOF");
// System.out.println("Still no >");
buf.append(", ");
in.unread();
matchGJIdent(in, buf); // Recursive call
}
// System.out.println("Exit >");
buf.append((char) ch);
} else
in.unread();
ch = in.read();
if (identStart(ch)) {
in.unread();
matchGJIdent(in, buf);
} else if (ch == ')') {
in.unread();
return;
} else if (ch != ';')
throw new RuntimeException("Illegal signature: " + in.getData() + " read " + (char) ch);
}
public static String translate(String s) {
// System.out.println("Sig:" + s);
StringBuffer buf = new StringBuffer();
matchGJIdent(new MyByteArrayInputStream(s), buf);
return buf.toString();
}
public static final boolean isFormalParameterList(String s) {
return s.startsWith("<") && (s.indexOf(':') > 0);
}
public static final boolean isActualParameterList(String s) {
return s.startsWith("L") && s.endsWith(">;");
}
/**
* @return String representation
*/
@Override
public final String toString() {
String s = getSignature();
return "Signature(" + s + ")";
}
// /**
// * @return deep copy of this attribute
// */
// @Override
// public Attribute copy(ConstantPool constant_pool) {
// return (Signature) clone();
// }
}