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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
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     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.base.BaseTryBlock;
     36 import org.jf.dexlib2.iface.ExceptionHandler;
     37 import org.jf.dexlib2.iface.TryBlock;
     38 import org.jf.util.ImmutableConverter;
     39 import org.jf.util.ImmutableUtils;
     40 
     41 import javax.annotation.Nonnull;
     42 import javax.annotation.Nullable;
     43 import java.util.List;
     44 
     45 public class ImmutableTryBlock extends BaseTryBlock<ImmutableExceptionHandler> {
     46     protected final int startCodeAddress;
     47     protected final int codeUnitCount;
     48     @Nonnull protected final ImmutableList<? extends ImmutableExceptionHandler> exceptionHandlers;
     49 
     50     public ImmutableTryBlock(int startCodeAddress,
     51                              int codeUnitCount,
     52                              @Nullable List<? extends ExceptionHandler> exceptionHandlers) {
     53         this.startCodeAddress = startCodeAddress;
     54         this.codeUnitCount = codeUnitCount;
     55         this.exceptionHandlers = ImmutableExceptionHandler.immutableListOf(exceptionHandlers);
     56     }
     57 
     58     public ImmutableTryBlock(int startCodeAddress,
     59                              int codeUnitCount,
     60                              @Nullable ImmutableList<? extends ImmutableExceptionHandler> exceptionHandlers) {
     61         this.startCodeAddress = startCodeAddress;
     62         this.codeUnitCount = codeUnitCount;
     63         this.exceptionHandlers = ImmutableUtils.nullToEmptyList(exceptionHandlers);
     64     }
     65 
     66     public static ImmutableTryBlock of(TryBlock<? extends ExceptionHandler> tryBlock) {
     67         if (tryBlock instanceof ImmutableTryBlock) {
     68             return (ImmutableTryBlock)tryBlock;
     69         }
     70         return new ImmutableTryBlock(
     71                 tryBlock.getStartCodeAddress(),
     72                 tryBlock.getCodeUnitCount(),
     73                 tryBlock.getExceptionHandlers());
     74     }
     75 
     76     @Override public int getStartCodeAddress() { return startCodeAddress; }
     77     @Override public int getCodeUnitCount() { return codeUnitCount; }
     78 
     79     @Nonnull @Override public ImmutableList<? extends ImmutableExceptionHandler> getExceptionHandlers() {
     80         return exceptionHandlers;
     81     }
     82 
     83     @Nonnull
     84     public static ImmutableList<ImmutableTryBlock> immutableListOf(
     85             @Nullable List<? extends TryBlock<? extends ExceptionHandler>> list) {
     86         return CONVERTER.toList(list);
     87     }
     88 
     89     private static final ImmutableConverter<ImmutableTryBlock, TryBlock<? extends ExceptionHandler>> CONVERTER =
     90             new ImmutableConverter<ImmutableTryBlock, TryBlock<? extends ExceptionHandler>>() {
     91                 @Override
     92                 protected boolean isImmutable(@Nonnull TryBlock item) {
     93                     return item instanceof ImmutableTryBlock;
     94                 }
     95 
     96                 @Nonnull
     97                 @Override
     98                 protected ImmutableTryBlock makeImmutable(@Nonnull TryBlock<? extends ExceptionHandler> item) {
     99                     return ImmutableTryBlock.of(item);
    100                 }
    101             };
    102 }
    103