com.github.wnameless.nullproof.aspectj.AbstractNullProofAspect.java Source code

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Here is the source code for com.github.wnameless.nullproof.aspectj.AbstractNullProofAspect.java

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/**
 *
 * @author Wei-Ming Wu
 *
 *
 * Copyright 2014 Wei-Ming Wu
 *
 * 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 com.github.wnameless.nullproof.aspectj;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.ConstructorSignature;
import org.aspectj.lang.reflect.MethodSignature;

import com.github.wnameless.nullproof.NullBlocker;

@Aspect
public abstract class AbstractNullProofAspect {

    @Pointcut("within(@com.github.wnameless.nullproof.annotation.RejectNull *)")
    public void classAnnotatedWithRejectNull() {
    }

    @Pointcut("args(*, ..)")
    public void atLeast1Argument() {
    }

    @Pointcut("execution(*.new(..))")
    public void constructor() {
    }

    @Pointcut("classAnnotatedWithRejectNull() && constructor() && atLeast1Argument() "
            + "&& !@annotation(com.github.wnameless.nullproof.annotation.AcceptNull)")
    public void constructorOfRejectNullAnnotatedClassWithoutAcceptNull() {
    }

    @Before("constructorOfRejectNullAnnotatedClassWithoutAcceptNull()")
    public void rejectNullForConsructors(JoinPoint jointPoint) {
        ConstructorSignature sig = (ConstructorSignature) jointPoint.getSignature();
        NullBlocker.blockNulls(sig.getConstructor(), jointPoint.getArgs());
    }

    @Pointcut("execution(public * *(..))")
    public void publicMethod() {
    }

    @Pointcut("execution(public boolean equals(Object))")
    public void equalsMethod() {
    }

    @Pointcut("classAnnotatedWithRejectNull() && publicMethod() && !equalsMethod() && atLeast1Argument() "
            + "&& !@annotation(com.github.wnameless.nullproof.annotation.AcceptNull)")
    public void publicMethodOfRejectNullAnnotatedClassWithoutAcceptNull() {
    }

    @Before("publicMethodOfRejectNullAnnotatedClassWithoutAcceptNull()")
    public void rejectNullForPublicMethods(JoinPoint jointPoint) {
        MethodSignature sig = (MethodSignature) jointPoint.getSignature();
        NullBlocker.blockNulls(sig.getMethod(), jointPoint.getArgs());
    }

}