/*
* 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.Writer;
import java.sql.Array;
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.BlobImpl;
import org.teiid.core.types.BlobType;
import org.teiid.core.types.Streamable;
import org.teiid.query.QueryPlugin;
import org.teiid.query.sql.symbol.DerivedColumn;
import org.teiid.query.sql.symbol.ElementSymbol;
import org.teiid.query.sql.symbol.TextLine;
import org.teiid.query.util.CommandContext;
/**
* Aggregates Text entries
*/
public class TextAgg extends SingleArgumentAggregateFunction {
private FileStoreInputStreamFactory result;
private TextLine textLine;
public TextAgg(TextLine textLine) {
this.textLine = textLine;
}
private FileStoreInputStreamFactory buildResult(CommandContext context) throws TeiidProcessingException {
try {
FileStore fs = context.getBufferManager().createFileStore("textagg"); //$NON-NLS-1$
FileStoreInputStreamFactory fisf = new FileStoreInputStreamFactory(fs, textLine.getEncoding()==null?Streamable.ENCODING:textLine.getEncoding());
Writer w = fisf.getWriter();
if (textLine.isIncludeHeader()) {
Object[] header = TextLine.evaluate(textLine.getExpressions(), new TextLine.ValueExtractor<DerivedColumn>() {
public Object getValue(DerivedColumn t) {
if (t.getAlias() == null && t.getExpression() instanceof ElementSymbol) {
return ((ElementSymbol)t.getExpression()).getShortName();
}
return t.getAlias();
}
}, textLine);
writeList(w, header);
}
w.flush();
return fisf;
} catch (IOException e) {
throw new TeiidProcessingException(QueryPlugin.Event.TEIID30420, e);
}
}
private void writeList(Writer w, Object[] list) throws IOException {
for (int i = 0; i < list.length; i++) {
w.write(list[i].toString());
}
}
public void reset() {
this.result = null;
}
/**
* @throws TeiidProcessingException
* @throws TeiidComponentException
* @see org.teiid.query.function.aggregate.AggregateFunction#addInputDirect(List, CommandContext, CommandContext)
*/
public void addInputDirect(Object input, List<?> tuple, CommandContext commandContext) throws TeiidComponentException, TeiidProcessingException {
try {
if (this.result == null) {
this.result = buildResult(commandContext);
}
Array in = (Array)input;
Writer w = result.getWriter();
writeList(w, (Object[])in.getArray());
w.flush();
} catch (SQLException e) {
throw new TeiidProcessingException(QueryPlugin.Event.TEIID30421, e);
} catch (IOException e) {
throw new TeiidProcessingException(QueryPlugin.Event.TEIID30421, 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 {
FileStoreOutputStream fs = this.result.getOuputStream();
fs.close();
if (fs.bytesWritten()) {
return new BlobType(new BlobImpl(result));
}
return new BlobType(new SerialBlob(Arrays.copyOf(fs.getBuffer(), fs.getCount())));
} catch (IOException e) {
throw new TeiidProcessingException(QueryPlugin.Event.TEIID30422, e);
} catch (SQLException e) {
throw new TeiidProcessingException(QueryPlugin.Event.TEIID30423, e);
}
}
}