http://asm.objectweb.org/asm-tree/: A very small and fast Java bytecode manipulation framework (ObjectWeb)
  • Eric Bruneton
  • Eugene Kuleshov
  • Remi Forax 
ASM XML Adapter
Copyright (c) 2004-2011, Eugene Kuleshov
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. Neither the name of the copyright holders nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS 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 COPYRIGHT OWNER OR 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.

/***
 * ASM XML Adapter
 * Copyright (c) 2004-2011, Eugene Kuleshov
 * 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. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS 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 COPYRIGHT OWNER OR 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.
 */
package org.objectweb.asm.xml;

import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.TypePath;
import org.xml.sax.ContentHandler;
import org.xml.sax.helpers.AttributesImpl;


A ClassVisitor that generates SAX 2.0 events from the visited class. It can feed any kind of ContentHandler, e.g. XML serializer, XSLT or XQuery engines. 
Author:Eugene Kuleshov
See Also:
/**
 * A {@link org.objectweb.asm.ClassVisitor ClassVisitor} that generates SAX 2.0
 * events from the visited class. It can feed any kind of
 * {@link org.xml.sax.ContentHandler ContentHandler}, e.g. XML serializer, XSLT
 * or XQuery engines.
 * 
 * @see org.objectweb.asm.xml.Processor
 * @see org.objectweb.asm.xml.ASMContentHandler
 * 
 * @author Eugene Kuleshov
 */
public final class SAXClassAdapter extends ClassVisitor {

    SAXAdapter sa;

    private final boolean singleDocument;

    
Pseudo access flag used to distinguish class access flags.

/**
     * Pseudo access flag used to distinguish class access flags.
     */
    private static final int ACCESS_CLASS = 262144;

    
Pseudo access flag used to distinguish field access flags.

/**
     * Pseudo access flag used to distinguish field access flags.
     */
    private static final int ACCESS_FIELD = 524288;

    
Pseudo access flag used to distinguish inner class flags.

/**
     * Pseudo access flag used to distinguish inner class flags.
     */
    private static final int ACCESS_INNER = 1048576;

    
Constructs a new SAXClassAdapter object. 
Params:
  • h – 
           content handler that will be used to send SAX 2.0 events.
  • singleDocument – 
           if true adapter will not produce startDocument() and endDocument() events.
/**
     * Constructs a new {@link SAXClassAdapter SAXClassAdapter} object.
     * 
     * @param h
     *            content handler that will be used to send SAX 2.0 events.
     * @param singleDocument
     *            if <tt>true</tt> adapter will not produce
     *            {@link ContentHandler#startDocument() startDocument()} and
     *            {@link ContentHandler#endDocument() endDocument()} events.
     */
    public SAXClassAdapter(final ContentHandler h, boolean singleDocument) {
        super(Opcodes.ASM5);
        this.sa = new SAXAdapter(h);
        this.singleDocument = singleDocument;
        if (!singleDocument) {
            sa.addDocumentStart();
        }
    }

    @Override
    public void visitSource(final String source, final String debug) {
        AttributesImpl att = new AttributesImpl();
        if (source != null) {
            att.addAttribute("", "file", "file", "", encode(source));
        }
        if (debug != null) {
            att.addAttribute("", "debug", "debug", "", encode(debug));
        }

        sa.addElement("source", att);
    }

    @Override
    public void visitOuterClass(final String owner, final String name,
            final String desc) {
        AttributesImpl att = new AttributesImpl();
        att.addAttribute("", "owner", "owner", "", owner);
        if (name != null) {
            att.addAttribute("", "name", "name", "", name);
        }
        if (desc != null) {
            att.addAttribute("", "desc", "desc", "", desc);
        }

        sa.addElement("outerclass", att);
    }

    @Override
    public AnnotationVisitor visitAnnotation(final String desc,
            final boolean visible) {
        return new SAXAnnotationAdapter(sa, "annotation", visible ? 1 : -1,
                null, desc);
    }

    @Override
    public AnnotationVisitor visitTypeAnnotation(int typeRef,
            TypePath typePath, String desc, boolean visible) {
        return new SAXAnnotationAdapter(sa, "typeAnnotation", visible ? 1 : -1,
                null, desc, typeRef, typePath);
    }

    @Override
    public void visit(final int version, final int access, final String name,
            final String signature, final String superName,
            final String[] interfaces) {
        StringBuilder sb = new StringBuilder();
        appendAccess(access | ACCESS_CLASS, sb);

        AttributesImpl att = new AttributesImpl();
        att.addAttribute("", "access", "access", "", sb.toString());
        if (name != null) {
            att.addAttribute("", "name", "name", "", name);
        }
        if (signature != null) {
            att.addAttribute("", "signature", "signature", "",
                    encode(signature));
        }
        if (superName != null) {
            att.addAttribute("", "parent", "parent", "", superName);
        }
        att.addAttribute("", "major", "major", "",
                Integer.toString(version & 0xFFFF));
        att.addAttribute("", "minor", "minor", "",
                Integer.toString(version >>> 16));
        sa.addStart("class", att);

        sa.addStart("interfaces", new AttributesImpl());
        if (interfaces != null && interfaces.length > 0) {
            for (int i = 0; i < interfaces.length; i++) {
                AttributesImpl att2 = new AttributesImpl();
                att2.addAttribute("", "name", "name", "", interfaces[i]);
                sa.addElement("interface", att2);
            }
        }
        sa.addEnd("interfaces");
    }

    @Override
    public FieldVisitor visitField(final int access, final String name,
            final String desc, final String signature, final Object value) {
        StringBuilder sb = new StringBuilder();
        appendAccess(access | ACCESS_FIELD, sb);

        AttributesImpl att = new AttributesImpl();
        att.addAttribute("", "access", "access", "", sb.toString());
        att.addAttribute("", "name", "name", "", name);
        att.addAttribute("", "desc", "desc", "", desc);
        if (signature != null) {
            att.addAttribute("", "signature", "signature", "",
                    encode(signature));
        }
        if (value != null) {
            att.addAttribute("", "value", "value", "", encode(value.toString()));
        }

        return new SAXFieldAdapter(sa, att);
    }

    @Override
    public MethodVisitor visitMethod(final int access, final String name,
            final String desc, final String signature, final String[] exceptions) {
        StringBuilder sb = new StringBuilder();
        appendAccess(access, sb);

        AttributesImpl att = new AttributesImpl();
        att.addAttribute("", "access", "access", "", sb.toString());
        att.addAttribute("", "name", "name", "", name);
        att.addAttribute("", "desc", "desc", "", desc);
        if (signature != null) {
            att.addAttribute("", "signature", "signature", "", signature);
        }
        sa.addStart("method", att);

        sa.addStart("exceptions", new AttributesImpl());
        if (exceptions != null && exceptions.length > 0) {
            for (int i = 0; i < exceptions.length; i++) {
                AttributesImpl att2 = new AttributesImpl();
                att2.addAttribute("", "name", "name", "", exceptions[i]);
                sa.addElement("exception", att2);
            }
        }
        sa.addEnd("exceptions");

        return new SAXCodeAdapter(sa, access);
    }

    @Override
    public final void visitInnerClass(final String name,
            final String outerName, final String innerName, final int access) {
        StringBuilder sb = new StringBuilder();
        appendAccess(access | ACCESS_INNER, sb);

        AttributesImpl att = new AttributesImpl();
        att.addAttribute("", "access", "access", "", sb.toString());
        if (name != null) {
            att.addAttribute("", "name", "name", "", name);
        }
        if (outerName != null) {
            att.addAttribute("", "outerName", "outerName", "", outerName);
        }
        if (innerName != null) {
            att.addAttribute("", "innerName", "innerName", "", innerName);
        }
        sa.addElement("innerclass", att);
    }

    @Override
    public final void visitEnd() {
        sa.addEnd("class");
        if (!singleDocument) {
            sa.addDocumentEnd();
        }
    }

    static final String encode(final String s) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            if (c == '\\') {
                sb.append("\\\\");
            } else if (c < 0x20 || c > 0x7f) {
                sb.append("\\u");
                if (c < 0x10) {
                    sb.append("000");
                } else if (c < 0x100) {
                    sb.append("00");
                } else if (c < 0x1000) {
                    sb.append('0');
                }
                sb.append(Integer.toString(c, 16));
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }

    static void appendAccess(final int access, final StringBuilder sb) {
        if ((access & Opcodes.ACC_PUBLIC) != 0) {
            sb.append("public ");
        }
        if ((access & Opcodes.ACC_PRIVATE) != 0) {
            sb.append("private ");
        }
        if ((access & Opcodes.ACC_PROTECTED) != 0) {
            sb.append("protected ");
        }
        if ((access & Opcodes.ACC_FINAL) != 0) {
            sb.append("final ");
        }
        if ((access & Opcodes.ACC_STATIC) != 0) {
            sb.append("static ");
        }
        if ((access & Opcodes.ACC_SUPER) != 0) {
            if ((access & ACCESS_CLASS) == 0) {
                sb.append("synchronized ");
            } else {
                sb.append("super ");
            }
        }
        if ((access & Opcodes.ACC_VOLATILE) != 0) {
            if ((access & ACCESS_FIELD) == 0) {
                sb.append("bridge ");
            } else {
                sb.append("volatile ");
            }
        }
        if ((access & Opcodes.ACC_TRANSIENT) != 0) {
            if ((access & ACCESS_FIELD) == 0) {
                sb.append("varargs ");
            } else {
                sb.append("transient ");
            }
        }
        if ((access & Opcodes.ACC_NATIVE) != 0) {
            sb.append("native ");
        }
        if ((access & Opcodes.ACC_STRICT) != 0) {
            sb.append("strict ");
        }
        if ((access & Opcodes.ACC_INTERFACE) != 0) {
            sb.append("interface ");
        }
        if ((access & Opcodes.ACC_ABSTRACT) != 0) {
            sb.append("abstract ");
        }
        if ((access & Opcodes.ACC_SYNTHETIC) != 0) {
            sb.append("synthetic ");
        }
        if ((access & Opcodes.ACC_ANNOTATION) != 0) {
            sb.append("annotation ");
        }
        if ((access & Opcodes.ACC_ENUM) != 0) {
            sb.append("enum ");
        }
        if ((access & Opcodes.ACC_DEPRECATED) != 0) {
            sb.append("deprecated ");
        }
        if ((access & Opcodes.ACC_MANDATED) != 0) {
            sb.append("mandated ");
        }
    }
}