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      1 /*
      2  * [The "BSD licence"]
      3  * Copyright (c) 2010 Ben Gruver (JesusFreke)
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. The name of the author may not be used to endorse or promote products
     15  *    derived from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 package org.jf.dexlib.EncodedValue;
     30 
     31 import org.jf.dexlib.Util.AnnotatedOutput;
     32 
     33 public class NullEncodedValue extends EncodedValue {
     34     /**
     35      * The singleton value
     36      */
     37     public static final NullEncodedValue NullValue = new NullEncodedValue();
     38 
     39     /**
     40      * Constructs a new <code>NullEncodedValue</code>
     41      */
     42     private NullEncodedValue() {
     43     }
     44 
     45     /** {@inheritDoc} */
     46     public void writeValue(AnnotatedOutput out) {
     47         if (out.annotates()) {
     48             out.annotate("value_type=" + ValueType.VALUE_NULL.name() + ",value_arg=0");
     49         }
     50         out.writeByte(ValueType.VALUE_NULL.value);
     51     }
     52 
     53     /** {@inheritDoc} */
     54     public int placeValue(int offset) {
     55         return offset + 1;
     56     }
     57 
     58     /** {@inheritDoc} */
     59     protected int compareValue(EncodedValue o) {
     60         return 0;
     61     }
     62 
     63     /** {@inheritDoc} */
     64     public ValueType getValueType() {
     65         return ValueType.VALUE_NULL;
     66     }
     67 
     68     @Override
     69     public int hashCode() {
     70         return 1;
     71     }
     72 }
     73