SparseSwitchMethodItem.java

/*
 * [The "BSD licence"]
 * Copyright (c) 2010 Ben Gruver (JesusFreke)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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
 * INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.jf.baksmali.Adaptors.Format;

import org.jf.baksmali.Adaptors.LabelMethodItem;
import org.jf.baksmali.Adaptors.MethodDefinition;
import org.jf.util.IndentingWriter;
import org.jf.baksmali.Renderers.IntegerRenderer;
import org.jf.dexlib.Code.Format.SparseSwitchDataPseudoInstruction;
import org.jf.dexlib.CodeItem;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class SparseSwitchMethodItem extends InstructionMethodItem<SparseSwitchDataPseudoInstruction>
        implements Iterable<LabelMethodItem> {
    private final List<SparseSwitchTarget> targets;

    public SparseSwitchMethodItem(MethodDefinition methodDefinition, CodeItem codeItem, int codeAddress,
                                  SparseSwitchDataPseudoInstruction instruction) {
        super(codeItem, codeAddress, instruction);

        int baseCodeAddress = methodDefinition.getSparseSwitchBaseAddress(codeAddress);

        targets = new ArrayList<SparseSwitchTarget>();
        Iterator<SparseSwitchDataPseudoInstruction.SparseSwitchTarget> iterator = instruction.iterateKeysAndTargets();
        while (iterator.hasNext()) {
            SparseSwitchDataPseudoInstruction.SparseSwitchTarget target = iterator.next();
            SparseSwitchTarget sparseSwitchTarget = new SparseSwitchTarget();
            sparseSwitchTarget.Key = target.key;

            LabelMethodItem label = new LabelMethodItem(baseCodeAddress + target.targetAddressOffset, "sswitch_");
            label = methodDefinition.getLabelCache().internLabel(label);
            sparseSwitchTarget.Target = label;

            targets.add(sparseSwitchTarget);
        }
    }

    @Override
    public boolean writeTo(IndentingWriter writer) throws IOException {
        writer.write(".sparse-switch\n");
        writer.indent(4);
        for (SparseSwitchTarget target: targets) {
            IntegerRenderer.writeTo(writer, target.Key);
            writer.write(" -> ");
            target.Target.writeTo(writer);
            writer.write('\n');
        }
        writer.deindent(4);
        writer.write(".end sparse-switch");
        return true;
    }

    public Iterator<LabelMethodItem> iterator() {
        return new Iterator<LabelMethodItem>() {
            private Iterator<SparseSwitchTarget> iterator = targets.iterator();

            public boolean hasNext() {
                return iterator.hasNext();
            }

            public LabelMethodItem next() {
                return iterator.next().Target;
            }

            public void remove() {
                iterator.remove();
            }
        };
    }

    private static class SparseSwitchTarget {
        public int Key;
        public LabelMethodItem Target;
    }
}