/*
* 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.query.function.aggregate;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.List;
import javax.sql.rowset.serial.SerialBlob;
import org.teiid.common.buffer.FileStore;
import org.teiid.common.buffer.FileStore.FileStoreOutputStream;
import org.teiid.common.buffer.FileStoreInputStreamFactory;
import org.teiid.core.TeiidComponentException;
import org.teiid.core.TeiidProcessingException;
import org.teiid.core.types.BinaryType;
import org.teiid.core.types.BlobImpl;
import org.teiid.core.types.BlobType;
import org.teiid.core.types.ClobImpl;
import org.teiid.core.types.ClobType;
import org.teiid.core.types.Streamable;
import org.teiid.core.util.ObjectConverterUtil;
import org.teiid.query.QueryPlugin;
import org.teiid.query.util.CommandContext;
/**
* Aggregates binary and character strings
*/
public class StringAgg extends AggregateFunction {
private FileStoreInputStreamFactory result;
private boolean binary;
public StringAgg(boolean binary) {
this.binary = binary;
}
private FileStoreInputStreamFactory buildResult(CommandContext context) {
FileStore fs = context.getBufferManager().createFileStore("string_agg"); //$NON-NLS-1$
FileStoreInputStreamFactory fisf = new FileStoreInputStreamFactory(fs, Streamable.ENCODING);
return fisf;
}
public void reset() {
this.result = null;
}
@Override
public void addInputDirect(List<?> tuple, CommandContext commandContext)
throws TeiidComponentException, TeiidProcessingException {
boolean first = false;
if (result == null) {
first = true;
result = buildResult(commandContext);
}
if (!first) {
Object delim = tuple.get(argIndexes[1]);
writeValue(delim);
}
Object val = tuple.get(argIndexes[0]);
writeValue(val);
}
private void writeValue(Object val) throws TeiidProcessingException {
try {
if (binary) {
if (val instanceof BinaryType) {
result.getOuputStream().write(((BinaryType)val).getBytesDirect());
return;
}
Blob b = (Blob)val;
InputStream binaryStream = b.getBinaryStream();
try {
ObjectConverterUtil.write(result.getOuputStream(), binaryStream, -1, false);
} finally {
binaryStream.close();
}
} else {
if (val instanceof String) {
result.getWriter().write((String)val);
return;
}
Clob c = (Clob)val;
Reader characterStream = c.getCharacterStream();
try {
ObjectConverterUtil.write(result.getWriter(), characterStream, -1, false);
} finally {
characterStream.close();
}
}
} catch (IOException e) {
throw new TeiidProcessingException(QueryPlugin.Event.TEIID30422, e);
} catch (SQLException e) {
throw new TeiidProcessingException(QueryPlugin.Event.TEIID30423, e);
}
}
/**
* @see org.teiid.query.function.aggregate.AggregateFunction#getResult(CommandContext)
*/
public Object getResult(CommandContext commandContext) throws TeiidProcessingException{
if (this.result == null) {
this.result = buildResult(commandContext);
}
try {
this.result.getWriter().close();
FileStoreOutputStream fs = this.result.getOuputStream();
fs.close();
if (binary) {
if (fs.bytesWritten()) {
return new BlobType(new BlobImpl(result));
}
return new BlobType(new SerialBlob(Arrays.copyOf(fs.getBuffer(), fs.getCount())));
}
if (fs.bytesWritten()) {
return new ClobType(new ClobImpl(result, -1));
}
return new ClobType(new ClobImpl(new String(Arrays.copyOf(fs.getBuffer(), fs.getCount()), Streamable.ENCODING)));
} catch (IOException e) {
throw new TeiidProcessingException(QueryPlugin.Event.TEIID30422, e);
} catch (SQLException e) {
throw new TeiidProcessingException(QueryPlugin.Event.TEIID30423, e);
}
}
}