dexlib2/src/main/java/org/jf/dexlib2/writer/builder/BuilderProtoPool.java

/*
 * Copyright 2013, 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.
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 * 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,
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package org.jf.dexlib2.writer.builder;

import com.google.common.collect.Maps;
import org.jf.dexlib2.iface.reference.MethodProtoReference;
import org.jf.dexlib2.iface.reference.MethodReference;
import org.jf.dexlib2.immutable.reference.ImmutableMethodProtoReference;
import org.jf.dexlib2.util.MethodUtil;
import org.jf.dexlib2.writer.ProtoSection;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Collection;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentMap;

class BuilderProtoPool
        implements ProtoSection<BuilderStringReference, BuilderTypeReference, BuilderMethodProtoReference, BuilderTypeList> {
    @Nonnull private final BuilderContext context;
    @Nonnull private final ConcurrentMap<MethodProtoReference, BuilderMethodProtoReference> internedItems =
            Maps.newConcurrentMap();

    BuilderProtoPool(@Nonnull BuilderContext context) {
        this.context = context;
    }

    @Nonnull public BuilderMethodProtoReference internMethodProto(@Nonnull MethodProtoReference methodProto) {
        BuilderMethodProtoReference ret = internedItems.get(methodProto);
        if (ret != null) {
            return ret;
        }

        BuilderMethodProtoReference protoReference = new BuilderMethodProtoReference(
                context.stringPool.internString(MethodUtil.getShorty(
                        methodProto.getParameterTypes(), methodProto.getReturnType())),
                context.typeListPool.internTypeList(methodProto.getParameterTypes()),
                context.typePool.internType(methodProto.getReturnType()));
        ret = internedItems.putIfAbsent(protoReference, protoReference);
        return ret==null?protoReference:ret;
    }

    @Nonnull public BuilderMethodProtoReference internMethodProto(@Nonnull MethodReference methodReference) {
        return internMethodProto(new ImmutableMethodProtoReference(
                methodReference.getParameterTypes(), methodReference.getReturnType()));
    }

    @Nonnull @Override public BuilderStringReference getShorty(@Nonnull BuilderMethodProtoReference proto) {
        return proto.shorty;
    }

    @Nonnull @Override public BuilderTypeReference getReturnType(@Nonnull BuilderMethodProtoReference proto) {
        return proto.returnType;
    }

    @Nullable @Override public BuilderTypeList getParameters(@Nonnull BuilderMethodProtoReference proto) {
        return proto.parameterTypes;
    }

    @Override public int getItemIndex(@Nonnull BuilderMethodProtoReference proto) {
        return proto.getIndex();
    }

    @Nonnull @Override public Collection<? extends Entry<? extends BuilderMethodProtoReference, Integer>> getItems() {
        return new BuilderMapEntryCollection<BuilderMethodProtoReference>(internedItems.values()) {
            @Override protected int getValue(@Nonnull BuilderMethodProtoReference key) {
                return key.index;
            }

            @Override protected int setValue(@Nonnull BuilderMethodProtoReference key, int value) {
                int prev = key.index;
                key.index = value;
                return prev;
            }
        };
    }
}