xref: /external/smali/dexlib2/src/main/java/org/jf/dexlib2/immutable/ImmutableTryBlock.java

/*
 * Copyright 2012, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.jf.dexlib2.immutable;

import com.google.common.base.Objects;
import com.google.common.collect.ImmutableList;
import org.jf.dexlib2.iface.ExceptionHandler;
import org.jf.dexlib2.iface.TryBlock;
import org.jf.util.ImmutableListConverter;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.List;

public class ImmutableTryBlock implements TryBlock {
    public final int startIndex;
    public final int instructionCount;
    @Nonnull public final ImmutableList<? extends ImmutableExceptionHandler> exceptionHandlers;

    public ImmutableTryBlock(int startIndex,
                             int instructionCount,
                             @Nullable List<? extends ExceptionHandler> exceptionHandlers) {
        this.startIndex = startIndex;
        this.instructionCount = instructionCount;
        this.exceptionHandlers = ImmutableExceptionHandler.immutableListOf(exceptionHandlers);
    }

    public ImmutableTryBlock(int startIndex,
                             int instructionCount,
                             @Nullable ImmutableList<? extends ImmutableExceptionHandler> exceptionHandlers) {
        this.startIndex = startIndex;
        this.instructionCount = instructionCount;
        this.exceptionHandlers = Objects.firstNonNull(exceptionHandlers, ImmutableList.<ImmutableExceptionHandler>of());
    }

    public static ImmutableTryBlock of(TryBlock tryBlock) {
        if (tryBlock instanceof ImmutableTryBlock) {
            return (ImmutableTryBlock)tryBlock;
        }
        return new ImmutableTryBlock(
                tryBlock.getStartIndex(),
                tryBlock.getInstructionCount(),
                tryBlock.getExceptionHandlers());
    }

    @Override public int getStartIndex() { return startIndex; }
    @Override public int getInstructionCount() { return instructionCount; }

    @Nonnull @Override public ImmutableList<? extends ImmutableExceptionHandler> getExceptionHandlers() {
        return exceptionHandlers;
    }

    @Nonnull
    public static ImmutableList<ImmutableTryBlock> immutableListOf(List<? extends TryBlock> list) {
        return CONVERTER.convert(list);
    }

    private static final ImmutableListConverter<ImmutableTryBlock, TryBlock> CONVERTER =
            new ImmutableListConverter<ImmutableTryBlock, TryBlock>() {
                @Override
                protected boolean isImmutable(TryBlock item) {
                    return item instanceof ImmutableTryBlock;
                }

                @Override
                protected ImmutableTryBlock makeImmutable(TryBlock item) {
                    return ImmutableTryBlock.of(item);
                }
            };
}