org.businessmanager.aspect.dao.TrackModificationsAdvise.java Source code

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Here is the source code for org.businessmanager.aspect.dao.TrackModificationsAdvise.java

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/*******************************************************************************
 * Copyright 2012 Christian Ternes and Thorsten Volland
 * 
 * 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.businessmanager.aspect.dao;

import java.util.Calendar;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.businessmanager.domain.TrackModifications;
import org.businessmanager.domain.ModificationType;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;

/**
 * This advice processes all DAO methods.
 *
 */
@Component
@Aspect
public class TrackModificationsAdvise {

    @Around("execution(* org.businessmanager.dao.*.save*(..))")
    public Object trackModificationsOnCreate(ProceedingJoinPoint joinPoint) throws Throwable {
        writeModificationInfo(joinPoint, ModificationType.CREATE);

        return joinPoint.proceed();
    }

    @Around("execution(* org.businessmanager.dao.*.update*(..))")
    public Object trackModificationsOnUpdate(ProceedingJoinPoint joinPoint) throws Throwable {
        writeModificationInfo(joinPoint, ModificationType.UPDATE);

        return joinPoint.proceed();
    }

    @Around("execution(* org.businessmanager.dao.*.remove*(..))")
    public Object trackModificationsOnDelete(ProceedingJoinPoint joinPoint) throws Throwable {
        writeModificationInfo(joinPoint, ModificationType.DELETE);

        return joinPoint.proceed();
    }

    private void writeModificationInfo(ProceedingJoinPoint joinPoint, ModificationType type) {
        TrackModifications entity = getEntity(joinPoint);
        if (entity != null) {
            entity.setModificationUser(getUsername());
            entity.setModificationDate(Calendar.getInstance());
            entity.setModificationType(type);
        }
    }

    private TrackModifications getEntity(ProceedingJoinPoint joinPoint) {
        Object[] args = joinPoint.getArgs();
        if (args != null && args.length == 1) {
            if (args[0] instanceof TrackModifications) {
                return (TrackModifications) args[0];
            }
        }
        return null;
    }

    private String getUsername() {
        if (SecurityContextHolder.getContext() != null
                && SecurityContextHolder.getContext().getAuthentication() != null) {
            return SecurityContextHolder.getContext().getAuthentication().getName();
        }
        return "unknown";
    }
}