ElseTag.java

/**
 * 
 * Copyright 2014 The Darks ORM Project (Liu lihua)
 *
 * 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 darks.orm.core.data.tags.impl;

import java.util.List;

import org.dom4j.Element;

import darks.orm.core.data.tags.AbstractTag;
import darks.orm.core.data.xml.InterfaceMethodData;

public class ElseTag extends AbstractTag
{
	
	public ElseTag()
	{
	}
	
	public ElseTag(AbstractTag prevTag)
	{
		super(prevTag);
	}

	@Override
	public boolean parseElement(Element el) throws Exception
	{
		return true;
	}
	
	@Override
	public Object computeSql(StringBuilder sqlBuf, List<Object> params, InterfaceMethodData data, Object prevValue) throws Exception
	{
		if (prevValue != null && (prevValue instanceof Boolean))
		{
			if ((Boolean)prevValue)
			{
				return null;
			}
		}
		super.computeSql(sqlBuf, params, data, prevValue);
		return null;
	}
	
	
}