corner.orm.tapestry.ReflectPrimaryKeyConverter.java Source code

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Here is the source code for corner.orm.tapestry.ReflectPrimaryKeyConverter.java

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// Copyright 2007 the original author or authors.
// site: http://www.bjmaxinfo.com
// file: $Id: ReflectPrimaryKeyConverter.java 3678 2007-11-14 04:43:52Z jcai $
// created at:2005-11-04
//
// 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 corner.orm.tapestry;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.tapestry.components.IPrimaryKeyConverter;

import corner.util.BeanUtils;

/**
 * ??Object?.
 * 
 * @author   <a href="http://wiki.java.net/bin/view/People/JunTsai">Jun Tsai</a>
 * @version   $Revision:3677 $
 * @since   2005-11-4
 */
public class ReflectPrimaryKeyConverter<T extends Object> implements IPrimaryKeyConverter {
    /**
     * Logger for this class
     */
    private static final Log logger = LogFactory.getLog(ReflectPrimaryKeyConverter.class);

    private String idStr;
    private Class<? extends Object> c;

    public ReflectPrimaryKeyConverter(Class<? extends Object> c, String idStr) {
        this.idStr = idStr;
        this.c = c;
    }

    /**
     * ?object?.
     * @see org.apache.tapestry.components.IPrimaryKeyConverter#getPrimaryKey(java.lang.Object)
     */
    public Object getPrimaryKey(Object obj) {
        if (logger.isDebugEnabled()) {
            logger.debug("getPrimaryKey(Object) -  : Object obj=" + obj); //$NON-NLS-1$
        }
        return BeanUtils.getProperty(obj, idStr);
    }

    /**
     * ??Object.
     * @see org.apache.tapestry.components.IPrimaryKeyConverter#getValue(java.lang.Object)
     */
    public Object getValue(Object id) {
        try {
            Object obj = c.newInstance();
            BeanUtils.setProperty(obj, idStr, id);

            if (logger.isDebugEnabled()) {
                logger.debug("getValue(Object) id[" + id + "]"); //$NON-NLS-1$
            }
            return obj;
        } catch (InstantiationException e) {
            e.printStackTrace();
            return null;
        } catch (IllegalAccessException e) {
            e.printStackTrace();
            return null;
        }

    }

}