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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.

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/*
 * Copyright (C) 2008 feilong
 *
 * 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.feilong.core.util.closure;

import org.apache.commons.collections4.Closure;

import com.feilong.core.Validate;
import com.feilong.core.bean.PropertyUtil;

/**
 * {@link org.apache.commons.collections4.Closure} 实现,用来更新指定属性的指定值.
 * 构造函数:
 * 
 * 
 * 
 * BeanPropertyValueChangeClosure 构造函数提供两个参数, 属性名称和指定的属性值
 * 
 *  * public BeanPropertyValueChangeClosure(String propertyName, Object propertyValue)
 * 
 * 
 * 注意: Possibly indexed and/or nested name of the property to be
 * modified,参见propertyName.
 * 
 * 
 * 典型的使用示例:
 * 
 * 
 * 
 *  * // create the closure
 * BeanPropertyValueChangeClosure closure = new BeanPropertyValueChangeClosure("activeEmployee", Boolean.TRUE);
 *
 * // update the Collection
 * CollectionUtils.forAllDo(peopleCollection, closure);
 * 
 * 
 * 上面的示例将会提取 peopleCollection 的每个 person 对象, 并且更新activeEmployee 属性值为true.
 * 
 * 
 * 
 * @author feilong
 * @param 
 *            the generic type
 * @see "org.apache.commons.beanutils.BeanPropertyValueChangeClosure"
 * @see "org.apache.commons.collections4.CollectionUtils#forAllDo(Iterable, Closure)"
 * @see "org.apache.commons.collections4.IterableUtils#forEach(Iterable, Closure)"
 * @since 1.10.2
 */
public class BeanPropertyValueChangeClosure implements Closure{

    /**
     * 指定bean对象排序属性名字.
     * 
     * 
     * 泛型T对象指定的属性名称,Possibly indexed and/or nested name of the property to be modified,参见
     * propertyName
     * 
     */
    private final String propertyName;

    /** 指定的属性值. */
    private final Object propertyValue;

    //---------------------------------------------------------------

    /**
     * Instantiates a new bean property value change closure.
     * 
     * 
     * 如果 propertyName 是null,抛出 {@link NullPointerException}

     * 如果 propertyName 是blank,抛出 {@link IllegalArgumentException}

     * 
     *
     * @param propertyName
     *            指定bean对象排序属性名字.
     *            
     *            泛型T对象指定的属性名称,Possibly indexed and/or nested name of the property to be modified,参见
     *            propertyName
     *            
     * @param propertyValue
     *            the value
     */
    public BeanPropertyValueChangeClosure(String propertyName, Object propertyValue){
        Validate.notBlank(propertyName, "propertyName can't be blank!");
        this.propertyName = propertyName;
        this.propertyValue = propertyValue;
    }

    //---------------------------------------------------------------

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.commons.collections4.Closure#execute(java.lang.Object)
     */
    @Override
    public void execute(T input){
        if (null == input){//如果 input是null,跳过去
            return;
        }

        PropertyUtil.setProperty(input, propertyName, propertyValue);
    }
}