verificationtypefactory.java

ProGuard 是一个免费的 Java类文件的压缩

/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2007 Eric Lafortune ([e-mail])
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.attribute.preverification;

import proguard.evaluation.value.*;
import proguard.classfile.*;
import proguard.classfile.util.ClassUtil;

/**
 * This class provides methods to create and reuse IntegerType objects.
 *
 * @author Eric Lafortune
 */
public class VerificationTypeFactory
{
    // Shared copies of Type objects, to avoid creating a lot of objects.
    static final IntegerType           INTEGER_TYPE            = new IntegerType();
    static final LongType              LONG_TYPE               = new LongType();
    static final FloatType             FLOAT_TYPE              = new FloatType();
    static final DoubleType            DOUBLE_TYPE             = new DoubleType();
    static final TopType               TOP_TYPE                = new TopType();
    static final NullType              NULL_TYPE               = new NullType();
    static final UninitializedThisType UNINITIALIZED_THIS_TYPE = new UninitializedThisType();


    /**
     * Creates a new IntegerType.
     */
    public static IntegerType createIntegerType()
    {
        return INTEGER_TYPE;
    }

    /**
     * Creates a new LongType.
     */
    public static LongType createLongType()
    {
        return LONG_TYPE;
    }

    /**
     * Creates a new FloatType.
     */
    public static FloatType createFloatType()
    {
        return FLOAT_TYPE;
    }

    /**
     * Creates a new DoubleType.
     */
    public static DoubleType createDoubleType()
    {
        return DOUBLE_TYPE;
    }

    /**
     * Creates a new TopType.
     */
    public static TopType createTopType()
    {
        return TOP_TYPE;
    }

    /**
     * Creates a new NullType.
     */
    public static NullType createNullType()
    {
        return NULL_TYPE;
    }

    /**
     * Creates a new UninitializedThisType.
     */
    public static UninitializedThisType createUninitializedThisType()
    {
        return UNINITIALIZED_THIS_TYPE;
    }

    /**
     * Creates a new UninitializedType for an instance that was created at
     * the given offset.
     */
    public static UninitializedType createUninitializedType(int newInstructionOffset)
    {
        return new UninitializedType(newInstructionOffset);
    }

    /**
     * Creates a new ObjectType of the given type.
     */
    public static ObjectType createObjectType(int classIndex)
    {
        return new ObjectType(classIndex);
    }
}