net.transmutator4j.mutations.IncrementMutation.java Source code

Introduction

Here is the source code for net.transmutator4j.mutations.IncrementMutation.java

Source

/*******************************************************************************
 * Copyright (c) 2010 - 2013 Danny Katzel.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Danny Katzel - initial API and implementation
 ******************************************************************************/
package net.transmutator4j.mutations;

import java.io.Serializable;

import org.objectweb.asm.Opcodes;

/**
 * {@code IncrementMutation} is a Mutation implementation
 * that changes increment instructions {@code ++ and +=} into
 * {@code -- and -=} and vice versa.
 * @author dkatzel-home
 *
 */
public final class IncrementMutation implements Mutation, Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private final int mutatedIncrement;

    /**
     * Construct a new instance of {@link IncrementMutation}
     * with the given increment.
     * @param increment the amount to increment.  A negative
     * value may be provided to create a decrement.
     */
    public IncrementMutation(int increment) {
        mutatedIncrement = -1 * increment;
    }

    @Override
    public String description() {
        return String.format("increment of %d became increment of %d", -1 * mutatedIncrement, mutatedIncrement);
    }

    @Override
    public int getMutatedOpCode() {
        return Opcodes.IINC;
    }

    @Override
    public int getOriginalOpCode() {
        return Opcodes.IINC;
    }

    public int getMutatedIncrement() {
        return mutatedIncrement;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + mutatedIncrement;
        return result;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        IncrementMutation other = (IncrementMutation) obj;
        return mutatedIncrement == other.mutatedIncrement;

    }

}