stackmaptype.java

jboss规则引擎

/**
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2005 INRIA, France Telecom
 * 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.attrs;

import org.drools.asm.Label;

/**
 * Verification type info used by {@link StackMapAttribute}.
 * 
 * @see <a href="http://www.jcp.org/en/jsr/detail?id=139">JSR 139 : Connected
 *      Limited Device Configuration 1.1</a>
 * 
 * @see "ClassFileFormat-Java6.fm Page 138 Friday, April 15, 2005 3:22 PM"
 * 
 * @author Eugene Kuleshov
 */

public class StackMapType {

    public static final int      ITEM_Top               = 0;
    public static final int      ITEM_Integer           = 1;
    public static final int      ITEM_Float             = 2;
    public static final int      ITEM_Double            = 3;
    public static final int      ITEM_Long              = 4;
    public static final int      ITEM_Null              = 5;
    public static final int      ITEM_UninitializedThis = 6;
    public static final int      ITEM_Object            = 7;
    public static final int      ITEM_Uninitialized     = 8;

    public static final String[] ITEM_NAMES             = {"Top", "Integer", "Float", "Double", "Long", "Null", "UninitializedThis", "Object", "Uninitialized"};

    private int                  type;
    private Label                offset;
    private String               object;

    private StackMapType(final int type) {
        this.type = type;
    }

    public int getType() {
        return this.type;
    }

    public static StackMapType getTypeInfo(final int itemType) {
        if ( itemType < StackMapType.ITEM_Top || itemType > StackMapType.ITEM_Uninitialized ) {
            throw new IllegalArgumentException( "" + itemType );
        }
        return new StackMapType( itemType );
    }

    public void setLabel(final Label offset) {
        this.offset = offset;
    }

    public void setObject(final String object) {
        this.object = object;
    }

    public Label getLabel() {
        return this.offset;
    }

    public String getObject() {
        return this.object;
    }

    public String toString() {
        final StringBuffer sb = new StringBuffer( StackMapType.ITEM_NAMES[this.type] );
        if ( this.type == StackMapType.ITEM_Object ) {
            sb.append( ":" ).append( this.object );
        }
        if ( this.type == StackMapType.ITEM_Uninitialized ) {
            sb.append( ":L" ).append( System.identityHashCode( this.offset ) );
        }
        return sb.toString();
    }
}