/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.core.types.basic;
import org.teiid.core.types.NullType;
import org.teiid.core.types.Transform;
import org.teiid.core.types.TransformationException;
import org.teiid.core.util.Assertion;
/**
* This class can do a simple null-->anything.
* Incoming value must be null and outgoing value is the same.
* This is purely for type purposes.
*/
public class NullToAnyTransform extends Transform {
public static final NullToAnyTransform INSTANCE = new NullToAnyTransform(Object.class);
private Class<?> targetType;
public NullToAnyTransform(Class<?> targetType) {
this.targetType = targetType;
}
/**
* Type of the incoming value.
* @return Source type
*/
public Class getSourceType() {
return NullType.class;
}
/**
* Type of the outgoing value.
* @return Target type
*/
public Class getTargetType() {
return targetType;
}
/**
* This method transforms a value of the source type into a value
* of the target type.
* @param value Incoming value - Integer
* @return Outgoing value - String
* @throws TransformationException if value is an incorrect input type or
* the transformation fails
*/
public Object transformDirect(Object value) throws TransformationException {
Assertion.isNull(value);
return null;
}
}