com.dm.estore.core.models.AbstractEntity.java Source code

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Here is the source code for com.dm.estore.core.models.AbstractEntity.java

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/*
 * Copyright 2014 Denis Morozov.
 * 
 * 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.dm.estore.core.models;

import java.lang.reflect.InvocationTargetException;
import java.util.Collection;
import java.util.Map;

import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.collections.CollectionUtils;

import com.dm.estore.common.exceptions.ImmutableStateException;

/**
 * Base class to derive entity classes from.
 * 
 * @author dmorozov
 */
@MappedSuperclass
public abstract class AbstractEntity extends AuditableEntity {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "ID")
    private Long id;

    /**
     * Returns the identifier of the entity.
     * 
     * @return the id
     */
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj) {

        if (this == obj) {
            return true;
        }

        if (this.id == null || obj == null || !(this.getClass().equals(obj.getClass()))) {
            return false;
        }

        AbstractEntity that = (AbstractEntity) obj;
        return this.id.equals(that.getId());
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode() {
        return id == null ? 0 : id.hashCode();
    }

    public <T> T cloneTo() {
        try {
            @SuppressWarnings("unchecked")
            T newClone = (T) BeanUtils.cloneBean(this);
            return newClone;

        } catch (IllegalAccessException | InstantiationException | InvocationTargetException
                | NoSuchMethodException e) {

            throw new ImmutableStateException(e);
        }
    }

    @SuppressWarnings("unchecked")
    public <Y> Y cloneTo(Y targetBean) {
        try {
            Map<String, String> sourceBeanProperties = BeanUtils.describe(this);
            Map<String, String> targetBeanProperties = BeanUtils.describe(targetBean);
            Collection<String> commonProperties = CollectionUtils.intersection(sourceBeanProperties.keySet(),
                    targetBeanProperties.keySet());
            for (String property : commonProperties) {
                BeanUtils.copyProperty(this, property, targetBean);
            }

            return targetBean;

        } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {

            throw new ImmutableStateException(e);
        }
    }
}