fieldswriter.java

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package org.apache.lucene.index;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache Lucene" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache Lucene", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

import java.util.Enumeration;
import java.util.Hashtable;
import java.io.IOException;

import org.apache.lucene.store.Directory;
import org.apache.lucene.store.OutputStream;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;

final class FieldsWriter {
  private FieldInfos fieldInfos;
  private OutputStream fieldsStream;
  private OutputStream indexStream;
  
  FieldsWriter(Directory d, String segment, FieldInfos fn)
       throws IOException {
    fieldInfos = fn;
    fieldsStream = d.createFile(segment + ".fdt");
    indexStream = d.createFile(segment + ".fdx");
  }

  final void close() throws IOException {
    fieldsStream.close();
    indexStream.close();
  }

  final void addDocument(Document doc) throws IOException {
    indexStream.writeLong(fieldsStream.getFilePointer());
    
    int storedCount = 0;
    Enumeration fields  = doc.fields();
    while (fields.hasMoreElements()) {
      Field field = (Field)fields.nextElement();
      if (field.isStored())
	storedCount++;
    }
    fieldsStream.writeVInt(storedCount);
    
    fields  = doc.fields();
    while (fields.hasMoreElements()) {
      Field field = (Field)fields.nextElement();
      if (field.isStored()) {
	fieldsStream.writeVInt(fieldInfos.fieldNumber(field.name()));

	byte bits = 0;
	if (field.isTokenized())
	  bits |= 1;
	fieldsStream.writeByte(bits);

	fieldsStream.writeString(field.stringValue());
      }
    }
  }
}