net.kamhon.ieagle.vo.ORWrapper.java Source code

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Here is the source code for net.kamhon.ieagle.vo.ORWrapper.java

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/*
 * Copyright 2012 Eng Kam Hon (kamhon@gmail.com)
 * 
 * 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 net.kamhon.ieagle.vo;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;

import javax.persistence.Column;

import net.kamhon.ieagle.util.VoUtil;

import org.apache.commons.lang.StringUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

public class ORWrapper {
    private Object vo;
    private String aliasName;
    private BeanWrapper wrapper;

    public ORWrapper() {
    }

    public ORWrapper(Object vo) {
        if (vo == null) {
            try {
                vo = Object.class.newInstance();
            } catch (Exception e) {
            }
        }

        this.vo = vo;
        wrapper = new BeanWrapperImpl(vo);
    }

    public ORWrapper(Object vo, String aliasName) {
        this.vo = vo;
        this.aliasName = aliasName;

        wrapper = new BeanWrapperImpl(vo);
    }

    public boolean hasProperty(String propertyName) {
        return getPropertyDescriptor(propertyName) != null;
    }

    /**
     * 
     * @param propertyName
     * @return null if not found
     */
    protected PropertyDescriptor getPropertyDescriptor(String propertyName) {
        PropertyDescriptor descriptor = null;
        try {
            descriptor = wrapper.getPropertyDescriptor(propertyName);
        } catch (Exception e) {
        }
        return descriptor;
    }

    /**
     * Base on {@link Column} to get the DbColumnName.<br/>
     * if aliasName exists,<br/>
     * For example, <code>user.username</code> will return</br> else <code>username</code> will return
     * 
     * @param propertyName
     * @return null if not found
     */
    public String getDbColumnName(String propertyName) {
        String colName = null;
        Field field = VoUtil.getField(vo, propertyName);
        if (field != null) {
            colName = getDbColumn(field);
            if (StringUtils.isNotBlank(colName)) {
                if (StringUtils.isNotBlank(aliasName)) {
                    colName = aliasName + "." + colName;
                }
            }
        }

        return colName;
    }

    private String getDbColumn(Field field) {
        if (field.isAnnotationPresent(Column.class)) {
            Column column = field.getAnnotation(Column.class);
            return column.name();
        } else {
            return null;
        }
    }

    public Object getVo() {
        return vo;
    }

    public void setVo(Object vo) {
        this.vo = vo;
    }

    public String getAliasName() {
        return aliasName;
    }

    public void setAliasName(String aliasName) {
        this.aliasName = aliasName;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((aliasName == null) ? 0 : aliasName.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        ORWrapper other = (ORWrapper) obj;
        if (aliasName == null) {
            if (other.aliasName != null)
                return false;
        } else if (!aliasName.equals(other.aliasName))
            return false;
        return true;
    }
}