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      1 /*
      2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
      3  *             of Java bytecode.
      4  *
      5  * Copyright (c) 2002-2014 Eric Lafortune (eric (at) graphics.cornell.edu)
      6  *
      7  * This program is free software; you can redistribute it and/or modify it
      8  * under the terms of the GNU General Public License as published by the Free
      9  * Software Foundation; either version 2 of the License, or (at your option)
     10  * any later version.
     11  *
     12  * This program is distributed in the hope that it will be useful, but WITHOUT
     13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
     15  * more details.
     16  *
     17  * You should have received a copy of the GNU General Public License along
     18  * with this program; if not, write to the Free Software Foundation, Inc.,
     19  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
     20  */
     21 package proguard.evaluation;
     22 
     23 import proguard.classfile.*;
     24 import proguard.classfile.constant.*;
     25 import proguard.classfile.constant.visitor.ConstantVisitor;
     26 import proguard.classfile.util.SimplifiedVisitor;
     27 import proguard.evaluation.value.*;
     28 
     29 /**
     30  * This class creates Value instance that correspond to specified constant pool
     31  * entries.
     32  *
     33  * @author Eric Lafortune
     34  */
     35 public class ConstantValueFactory
     36 extends      SimplifiedVisitor
     37 implements   ConstantVisitor
     38 {
     39     protected final ValueFactory valueFactory;
     40 
     41     // Field acting as a parameter for the ConstantVisitor methods.
     42     protected Value value;
     43 
     44 
     45     public ConstantValueFactory(ValueFactory valueFactory)
     46     {
     47         this.valueFactory = valueFactory;
     48     }
     49 
     50 
     51     /**
     52      * Returns the Value of the constant pool element at the given index.
     53      */
     54     public Value constantValue(Clazz clazz,
     55                                int   constantIndex)
     56     {
     57         // Visit the constant pool entry to get its return value.
     58         clazz.constantPoolEntryAccept(constantIndex, this);
     59 
     60         return value;
     61     }
     62 
     63 
     64     // Implementations for ConstantVisitor.
     65 
     66     public void visitIntegerConstant(Clazz clazz, IntegerConstant integerConstant)
     67     {
     68         value = valueFactory.createIntegerValue(integerConstant.getValue());
     69     }
     70 
     71     public void visitLongConstant(Clazz clazz, LongConstant longConstant)
     72     {
     73         value = valueFactory.createLongValue(longConstant.getValue());
     74     }
     75 
     76     public void visitFloatConstant(Clazz clazz, FloatConstant floatConstant)
     77     {
     78         value = valueFactory.createFloatValue(floatConstant.getValue());
     79     }
     80 
     81     public void visitDoubleConstant(Clazz clazz, DoubleConstant doubleConstant)
     82     {
     83         value = valueFactory.createDoubleValue(doubleConstant.getValue());
     84     }
     85 
     86     public void visitStringConstant(Clazz clazz, StringConstant stringConstant)
     87     {
     88         value = valueFactory.createReferenceValue(ClassConstants.NAME_JAVA_LANG_STRING,
     89                                                   stringConstant.javaLangStringClass,
     90                                                   false);
     91     }
     92 
     93     public void visitMethodHandleConstant(Clazz clazz, MethodHandleConstant methodHandleConstant)
     94     {
     95         value = valueFactory.createReferenceValue(ClassConstants.NAME_JAVA_LANG_INVOKE_METHOD_HANDLE,
     96                                                   methodHandleConstant.javaLangInvokeMethodHandleClass,
     97                                                   false);
     98     }
     99 
    100     public void visitClassConstant(Clazz clazz, ClassConstant classConstant)
    101     {
    102         value = valueFactory.createReferenceValue(classConstant.getName(clazz),
    103                                                   classConstant.referencedClass,
    104                                                   false);
    105     }
    106 
    107     public void visitMethodTypeConstant(Clazz clazz, MethodTypeConstant methodTypeConstant)
    108     {
    109         value = valueFactory.createReferenceValue(ClassConstants.NAME_JAVA_LANG_INVOKE_METHOD_TYPE,
    110                                                   methodTypeConstant.javaLangInvokeMethodTypeClass,
    111                                                   false);
    112     }
    113 }