Package org.teiid.query.function.aggregate

Source Code of org.teiid.query.function.aggregate.TextAgg

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* 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.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.FileStoreInputStreamFactory;
import org.teiid.common.buffer.FileStore.FileStoreOutputStream;
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.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 AggregateFunction {

    private FileStoreInputStreamFactory result;
    private CommandContext context;
    private TextLine textLine;
   
    public TextAgg(CommandContext context, TextLine textLine) {
      this.context = context;
      this.textLine = textLine;           
  }

  private FileStoreInputStreamFactory buildResult() 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()) {
        w.write(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.getDelimiter(), textLine.getQuote()));
      }
      w.flush();
      return fisf;
    } catch (IOException e) {
      throw new TeiidProcessingException(e);
    }
  }

    public void reset() {
      this.result = null;
    }

    /**
     * @throws TeiidProcessingException
     * @throws TeiidComponentException
     * @see org.teiid.query.function.aggregate.AggregateFunction#addInputDirect(Object, List)
     */
    public void addInputDirect(Object input, List<?> tuple) throws TeiidComponentException, TeiidProcessingException {
      try {
        if (this.result == null) {
          this.result = buildResult();
        }
        String in = (String)input;
        Writer w = result.getWriter();
        w.write(in);
      w.flush();
    } catch (IOException e) {
      throw new TeiidProcessingException(e);
    }
    }

    /**
     * @see org.teiid.query.function.aggregate.AggregateFunction#getResult()
     */
    public Object getResult() throws TeiidProcessingException{
      if (this.result == null) {
        this.result = buildResult();
      }
     
      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(e);
    catch (SQLException e) {
      throw new TeiidProcessingException(e);
    }
    }
}
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