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      1 /*
      2  * Copyright 2012, Google Inc.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  *     * Redistributions of source code must retain the above copyright
     10  * notice, this list of conditions and the following disclaimer.
     11  *     * Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *     * Neither the name of Google Inc. nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 package org.jf.dexlib2.immutable.instruction;
     33 
     34 import com.google.common.collect.ImmutableList;
     35 import org.jf.dexlib2.Format;
     36 import org.jf.dexlib2.Opcode;
     37 import org.jf.dexlib2.iface.instruction.formats.ArrayPayload;
     38 import org.jf.util.ImmutableUtils;
     39 
     40 import javax.annotation.Nonnull;
     41 import javax.annotation.Nullable;
     42 import java.util.List;
     43 
     44 public class ImmutableArrayPayload extends ImmutableInstruction implements ArrayPayload {
     45     public static final Opcode OPCODE = Opcode.ARRAY_PAYLOAD;
     46 
     47     protected final int elementWidth;
     48     @Nonnull protected final ImmutableList<Number> arrayElements;
     49 
     50     public ImmutableArrayPayload(int elementWidth,
     51                                  @Nullable List<Number> arrayElements) {
     52         super(OPCODE);
     53         this.elementWidth = elementWidth;
     54         this.arrayElements = arrayElements==null ? ImmutableList.<Number>of() : ImmutableList.copyOf(arrayElements);
     55     }
     56 
     57     public ImmutableArrayPayload(int elementWidth,
     58                                  @Nullable ImmutableList<Number> arrayElements) {
     59         super(OPCODE);
     60         //TODO: need to ensure this is a valid width (1, 2, 4, 8)
     61         this.elementWidth = elementWidth;
     62         //TODO: need to validate the elements fit within the width
     63         this.arrayElements = ImmutableUtils.nullToEmptyList(arrayElements);
     64     }
     65 
     66     @Nonnull
     67     public static ImmutableArrayPayload of(ArrayPayload instruction) {
     68         if (instruction instanceof ImmutableArrayPayload) {
     69             return (ImmutableArrayPayload)instruction;
     70         }
     71         return new ImmutableArrayPayload(
     72                 instruction.getElementWidth(),
     73                 instruction.getArrayElements());
     74     }
     75 
     76     @Override public int getElementWidth() { return elementWidth; }
     77     @Nonnull @Override public List<Number> getArrayElements() { return arrayElements; }
     78 
     79     @Override public int getCodeUnits() { return 4 + (elementWidth * arrayElements.size() + 1) / 2; }
     80     @Override public Format getFormat() { return OPCODE.format; }
     81 }
     82