convertingwrapdynabean.java

JAVA 文章管理系统源码

/*
 * Copyright 2001-2004 The Apache Software Foundation.
 * 
 * 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.apache.commons.beanutils;


/**
 * <p>Implementation of <code>DynaBean</code> that wraps a standard JavaBean
 * instance, so that DynaBean APIs can be used to access its properties,
 * though this implementation allows type conversion to occur when properties are set.
 * This means that (say) Strings can be passed in as values in setter methods and
 * this DynaBean will convert them to the correct primitive data types.</p>
 *
 * <p><strong>IMPLEMENTATION NOTE</strong> - This implementation does not
 * support the <code>contains()</code> and <code>remove()</code> methods.</p>
 *
 * @author James Strachan
 * @version $Revision: 1.3 $ $Date: 2002/01/23 22:35:58 $
 */

public class ConvertingWrapDynaBean extends WrapDynaBean {



    /**
     * Construct a new <code>DynaBean</code> associated with the specified
     * JavaBean instance.
     *
     * @param instance JavaBean instance to be wrapped
     */
    public ConvertingWrapDynaBean(Object instance) {

        super(instance);

    }


    /**
     * Set the value of the property with the specified name
     * performing any type conversions if necessary. So this method
     * can accept String values for primitive numeric data types for example.
     *
     * @param name Name of the property whose value is to be set
     * @param value Value to which this property is to be set
     *
     * @exception ConversionException if the specified value cannot be
     *  converted to the type required for this property
     * @exception IllegalArgumentException if there is no property
     *  of the specified name
     * @exception NullPointerException if an attempt is made to set a
     *  primitive property to null
     */
    public void set(String name, Object value) {

        try {
            BeanUtils.copyProperty(instance, name, value);
        } catch (Throwable t) {
            throw new IllegalArgumentException
                    ("Property '" + name + "' has no write method");
        }

    }
}