/*
* 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 java.io.BufferedReader;
import java.io.IOException;
import java.sql.SQLException;
import org.teiid.core.CorePlugin;
import org.teiid.core.types.ClobType;
import org.teiid.core.types.DataTypeManager;
import org.teiid.core.types.TransformationException;
import org.teiid.core.types.DataTypeManager.DefaultDataClasses;
public class ClobToStringTransform extends AnyToStringTransform {
public ClobToStringTransform() {
super(DefaultDataClasses.CLOB);
}
/**
* This method transforms a value of the source type into a value
* of the target type.
* @param value Incoming value of source type
* @return Outgoing value of target type
* @throws TransformationException if value is an incorrect input type or
* the transformation fails
*/
public Object transformDirect(Object value) throws TransformationException {
ClobType source = (ClobType)value;
BufferedReader reader = null;
try {
reader = new BufferedReader (source.getCharacterStream());
StringBuffer contents = new StringBuffer();
int chr = reader.read();
while (chr != -1 && contents.length() < DataTypeManager.MAX_STRING_LENGTH) {
contents.append((char)chr);
chr = reader.read();
}
return contents.toString();
} catch (SQLException e) {
throw new TransformationException(CorePlugin.Event.TEIID10080, e, CorePlugin.Util.gs(CorePlugin.Event.TEIID10080, new Object[] {getSourceType().getName(), getTargetType().getName()}));
} catch(IOException e) {
throw new TransformationException(CorePlugin.Event.TEIID10080, e, CorePlugin.Util.gs(CorePlugin.Event.TEIID10080, new Object[] {getSourceType().getName(), getTargetType().getName()}));
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
}
}
}
}
/**
* @see org.teiid.core.types.Transform#isExplicit()
*/
public boolean isExplicit() {
return true;
}
}