org.aspectj.apache.bcel.classfile.Signature Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of aspectjtools Show documentation
Show all versions of aspectjtools Show documentation
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.
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 (https://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, StringBuilder 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)) {
StringBuilder buf2 = new StringBuilder();
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;
}
StringBuilder buf2 = new StringBuilder();
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, StringBuilder 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);
StringBuilder buf = new StringBuilder();
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();
// }
}