org.pitest.mutationtest.engine.gregor.mutators.IncrementsMutator.java Source code

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Here is the source code for org.pitest.mutationtest.engine.gregor.mutators.IncrementsMutator.java

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/*
 * Copyright 2010 Henry Coles
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and limitations under the License.
 */
package org.pitest.mutationtest.engine.gregor.mutators;

import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.pitest.mutationtest.engine.MutationIdentifier;
import org.pitest.mutationtest.engine.gregor.MethodInfo;
import org.pitest.mutationtest.engine.gregor.MethodMutatorFactory;
import org.pitest.mutationtest.engine.gregor.MutationContext;

public enum IncrementsMutator implements MethodMutatorFactory {

    INCREMENTS_MUTATOR;

    public MethodVisitor create(final MutationContext context, final MethodInfo methodInfo,
            final MethodVisitor methodVisitor) {
        return new IncrementsMethodVisitor(this, context, methodVisitor);
    }

    public String getGloballyUniqueId() {
        return this.getClass().getName();
    }

    public String getName() {
        return name();
    }
}

class IncrementsMethodVisitor extends MethodVisitor {

    private final MethodMutatorFactory factory;
    private final MutationContext context;

    public IncrementsMethodVisitor(final MethodMutatorFactory factory, final MutationContext context,
            final MethodVisitor delegateMethodVisitor) {
        super(Opcodes.ASM5, delegateMethodVisitor);
        this.factory = factory;
        this.context = context;
    }

    @Override
    public void visitIincInsn(final int var, final int increment) {
        final MutationIdentifier newId = this.context.registerMutation(this.factory,
                "Changed increment from " + increment + " to " + -increment);
        if (this.context.shouldMutate(newId)) {
            this.mv.visitIincInsn(var, -increment);
        } else {
            this.mv.visitIincInsn(var, increment);
        }
    }

}