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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;
     33 
     34 import com.google.common.collect.ImmutableList;
     35 import org.jf.dexlib2.iface.ExceptionHandler;
     36 import org.jf.dexlib2.iface.MethodImplementation;
     37 import org.jf.dexlib2.iface.TryBlock;
     38 import org.jf.dexlib2.iface.debug.DebugItem;
     39 import org.jf.dexlib2.iface.instruction.Instruction;
     40 import org.jf.dexlib2.immutable.debug.ImmutableDebugItem;
     41 import org.jf.dexlib2.immutable.instruction.ImmutableInstruction;
     42 import org.jf.util.ImmutableUtils;
     43 
     44 import javax.annotation.Nonnull;
     45 import javax.annotation.Nullable;
     46 import java.util.List;
     47 
     48 public class ImmutableMethodImplementation implements MethodImplementation {
     49     protected final int registerCount;
     50     @Nonnull protected final ImmutableList<? extends ImmutableInstruction> instructions;
     51     @Nonnull protected final ImmutableList<? extends ImmutableTryBlock> tryBlocks;
     52     @Nonnull protected final ImmutableList<? extends ImmutableDebugItem> debugItems;
     53 
     54     public ImmutableMethodImplementation(int registerCount,
     55                                          @Nullable Iterable<? extends Instruction> instructions,
     56                                          @Nullable List<? extends TryBlock<? extends ExceptionHandler>> tryBlocks,
     57                                          @Nullable Iterable<? extends DebugItem> debugItems) {
     58         this.registerCount = registerCount;
     59         this.instructions = ImmutableInstruction.immutableListOf(instructions);
     60         this.tryBlocks = ImmutableTryBlock.immutableListOf(tryBlocks);
     61         this.debugItems = ImmutableDebugItem.immutableListOf(debugItems);
     62     }
     63 
     64     public ImmutableMethodImplementation(int registerCount,
     65                                          @Nullable ImmutableList<? extends ImmutableInstruction> instructions,
     66                                          @Nullable ImmutableList<? extends ImmutableTryBlock> tryBlocks,
     67                                          @Nullable ImmutableList<? extends ImmutableDebugItem> debugItems) {
     68         this.registerCount = registerCount;
     69         this.instructions = ImmutableUtils.nullToEmptyList(instructions);
     70         this.tryBlocks = ImmutableUtils.nullToEmptyList(tryBlocks);
     71         this.debugItems = ImmutableUtils.nullToEmptyList(debugItems);
     72     }
     73 
     74     @Nullable
     75     public static ImmutableMethodImplementation of(@Nullable MethodImplementation methodImplementation) {
     76         if (methodImplementation == null) {
     77             return null;
     78         }
     79         if (methodImplementation instanceof ImmutableMethodImplementation) {
     80             return (ImmutableMethodImplementation)methodImplementation;
     81         }
     82         return new ImmutableMethodImplementation(
     83                 methodImplementation.getRegisterCount(),
     84                 methodImplementation.getInstructions(),
     85                 methodImplementation.getTryBlocks(),
     86                 methodImplementation.getDebugItems());
     87     }
     88 
     89     @Override public int getRegisterCount() { return registerCount; }
     90     @Nonnull @Override public ImmutableList<? extends ImmutableInstruction> getInstructions() { return instructions; }
     91     @Nonnull @Override public ImmutableList<? extends ImmutableTryBlock> getTryBlocks() { return tryBlocks; }
     92     @Nonnull @Override public ImmutableList<? extends ImmutableDebugItem> getDebugItems() { return debugItems; }
     93 }
     94