saxcodeadapter.java

jboss规则引擎

/***
 * ASM XML Adapter
 * Copyright (c) 2004, 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.drools.asm.xml;

import java.util.HashMap;
import java.util.Map;

import org.drools.asm.AnnotationVisitor;
import org.drools.asm.Attribute;
import org.drools.asm.Label;
import org.drools.asm.MethodVisitor;
import org.drools.asm.Opcodes;
import org.drools.asm.Type;
import org.drools.asm.util.AbstractVisitor;
import org.xml.sax.ContentHandler;
import org.xml.sax.helpers.AttributesImpl;

/**
 * A {@link MethodVisitor} that generates SAX 2.0 events from the visited
 * method.
 * 
 * @see org.drools.asm.xml.SAXClassAdapter
 * @see org.drools.asm.xml.Processor
 * 
 * @author Eugene Kuleshov
 */
public final class SAXCodeAdapter extends SAXAdapter
    implements
    MethodVisitor {
    private Map labelNames;

    /**
     * Constructs a new {@link SAXCodeAdapter SAXCodeAdapter} object.
     * 
     * @param h content handler that will be used to send SAX 2.0 events.
     * @param access
     */
    public SAXCodeAdapter(final ContentHandler h,
                          final int access) {
        super( h );
        this.labelNames = new HashMap();

        if ( (access & (Opcodes.ACC_ABSTRACT | Opcodes.ACC_INTERFACE | Opcodes.ACC_NATIVE)) == 0 ) {
            addStart( "code",
                      new AttributesImpl() );
        }
    }

    public final void visitCode() {
    }

    public final void visitInsn(final int opcode) {
        addElement( AbstractVisitor.OPCODES[opcode],
                    new AttributesImpl() );
    }

    public final void visitIntInsn(final int opcode,
                                   final int operand) {
        final AttributesImpl attrs = new AttributesImpl();
        attrs.addAttribute( "",
                            "value",
                            "value",
                            "",
                            Integer.toString( operand ) );
        addElement( AbstractVisitor.OPCODES[opcode],
                    attrs );
    }

    public final void visitVarInsn(final int opcode,
                                   final int var) {
        final AttributesImpl attrs = new AttributesImpl();
        attrs.addAttribute( "",
                            "var",
                            "var",
                            "",
                            Integer.toString( var ) );
        addElement( AbstractVisitor.OPCODES[opcode],
                    attrs );
    }

    public final void visitTypeInsn(final int opcode,
                                    final String desc) {
        final AttributesImpl attrs = new AttributesImpl();
        attrs.addAttribute( "",
                            "desc",
                            "desc",
                            "",
                            desc );
        addElement( AbstractVisitor.OPCODES[opcode],
                    attrs );
    }

    public final void visitFieldInsn(final int opcode,
                                     final String owner,
                                     final String name,
                                     final String desc) {
        final AttributesImpl attrs = new AttributesImpl();
        attrs.addAttribute( "",
                            "owner",
                            "owner",
                            "",
                            owner );
        attrs.addAttribute( "",
                            "name",
                            "name",
                            "",
                            name );
        attrs.addAttribute( "",
                            "desc",
                            "desc",
                            "",
                            desc );
        addElement( AbstractVisitor.OPCODES[opcode],
                    attrs );
    }

    public final void visitMethodInsn(final int opcode,
                                      final String owner,
                                      final String name,
                                      final String desc) {
        final AttributesImpl attrs = new AttributesImpl();
        attrs.addAttribute( "",
                            "owner",
                            "owner",
                            "",
                            owner );
        attrs.addAttribute( "",
                            "name",
                            "name",
                            "",
                            name );
        attrs.addAttribute( "",
                            "desc",
                            "desc",
                            "",
                            desc );
        addElement( AbstractVisitor.OPCODES[opcode],
                    attrs );
    }

    public final void visitJumpInsn(final int opcode,
                                    final Label label) {
        final AttributesImpl attrs = new AttributesImpl();
        attrs.addAttribute( "",
                            "label",
                            "label",
                            "",
                            getLabel( label ) );
        addElement( AbstractVisitor.OPCODES[opcode],
                    attrs );
    }

    public final void visitLabel(final Label label) {
        final AttributesImpl attrs = new AttributesImpl();
        attrs.addAttribute( "",
                            "name",
                            "name",
                            "",
                            getLabel( label ) );
        addElement( "Label",
                    attrs );
    }

    public final void visitLdcInsn(final Object cst) {
        final AttributesImpl attrs = new AttributesImpl();
        attrs.addAttribute( "",
                            "cst",
                            "cst",
                            "",
                            SAXClassAdapter.encode( cst.toString() ) );
        attrs.addAttribute( "",
                            "desc",
                            "desc",
                            "",
                            Type.getDescriptor( cst.getClass() ) );
        addElement( AbstractVisitor.OPCODES[Opcodes.LDC],
                    attrs );
    }

    public final void visitIincInsn(final int var,
                                    final int increment) {
        final AttributesImpl attrs = new AttributesImpl();
        attrs.addAttribute( "",
                            "var",
                            "var",
                            "",
                            Integer.toString( var ) );
        attrs.addAttribute( "",
                            "inc",
                            "inc",
                            "",
                            Integer.toString( increment ) );
        addElement( AbstractVisitor.OPCODES[Opcodes.IINC],
                    attrs );
    }

    public final void visitTableSwitchInsn(final int min,
                                           final int max,
                                           final Label dflt,
                                           final Label[] labels) {
        final AttributesImpl attrs = new AttributesImpl();
        attrs.addAttribute( "",
                            "min",
                            "min",
                            "",