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An easy to use Application Programming Interface (API) for working with MARC and MARCXML in
Java.
/**
* Copyright (C) 2004 Bas Peters
*
* This file is part of MARC4J
*
* MARC4J 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.
*
* MARC4J 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 MARC4J; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
package org.marc4j;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FilenameFilter;
import org.marc4j.marc.Record;
/**
*
* A Marc reader which instead of handling a single file of MARC records it
* handles a directory, which it will scan for all .mrc files, and iterate
* through all of them in turn.
*
*
* @author Robert Haschart
*/
public class MarcDirStreamReader implements MarcReader {
File list[];
MarcReader curFileReader;
int curFileNum;
boolean permissive;
boolean convertToUTF8;
String defaultEncoding;
/**
* Constructs an instance that traverses the directory specified in the
* parameter.
*
* @param dirName - The path of the directory from which to read all of the
* .mrc files
*/
public MarcDirStreamReader(String dirName) {
File dir = new File(dirName);
init(dir, false, false, null);
}
/**
* Constructs an instance that traverses the directory specified in the
* parameter.
*
* @param dir - The path of the directory from which to read all of the .mrc
* files
*/
public MarcDirStreamReader(File dir) {
init(dir, false, false, null);
}
/**
* Constructs an instance that traverses the directory specified in the
* parameter. Takes the values passed in for permissive and convertToUTF8
* and passes them on to each of the MarcPermissiveStreamReader that it
* creates.
*
* @param dirName - The path of the directory from which to read all of the
* .mrc files
* @param permissive - Set to true to specify that reader should try to
* handle and recover from errors in the input.
* @param convertToUTF8 - Set to true to specify that reader should convert
* the records being read to UTF-8 encoding as they are being read.
*/
public MarcDirStreamReader(String dirName, boolean permissive,
boolean convertToUTF8) {
File dir = new File(dirName);
init(dir, permissive, convertToUTF8, null);
}
/**
* Constructs an instance that traverses the directory specified in the
* parameter. Takes the values passed in for permissive and convertToUTF8
* and passes them on to each of the MarcPermissiveStreamReader that it
* creates.
*
* @param dir - The path of the directory from which to read all of the .mrc
* files
* @param permissive - Set to true to specify that reader should try to
* handle and recover from errors in the input.
* @param convertToUTF8 - Set to true to specify that reader should convert
* the records being read to UTF-8 encoding as they are being read.
*/
public MarcDirStreamReader(File dir, boolean permissive,
boolean convertToUTF8) {
init(dir, permissive, convertToUTF8, null);
}
/**
* Constructs an instance that traverses the directory specified in the
* parameter. Takes the values passed in for permissive and convertToUTF8
* and passes them on to each of the MarcPermissiveStreamReader that it
* creates.
*
* @param dirName - The path of the directory from which to read all of the
* .mrc files
* @param permissive - Set to true to specify that reader should try to
* handle and recover from errors in the input.
* @param convertToUTF8 - Set to true to specify that reader should convert
* the records being read to UTF-8 encoding as they are being read.
* @param defaultEncoding - Specifies the character encoding that the
* records being read are presumed to be in..
*/
public MarcDirStreamReader(String dirName, boolean permissive,
boolean convertToUTF8, String defaultEncoding) {
File dir = new File(dirName);
init(dir, permissive, convertToUTF8, defaultEncoding);
}
/**
* Constructs an instance that traverses the directory specified in the
* parameter. Takes the values passed in for permissive and convertToUTF8
* and passes them on to each of the MarcPermissiveStreamReader that it
* creates.
*
* @param dir - The path of the directory from which to read all of the .mrc
* files
* @param permissive - Set to true to specify that reader should try to
* handle and recover from errors in the input.
* @param convertToUTF8 - Set to true to specify that reader should convert
* the records being read to UTF-8 encoding as they are being read.
* @param defaultEncoding - Specifies the character encoding that the
* records being read are presumed to be in..
*/
public MarcDirStreamReader(File dir, boolean permissive,
boolean convertToUTF8, String defaultEncoding) {
init(dir, permissive, convertToUTF8, defaultEncoding);
}
private void init(File dir, boolean permissive, boolean convertToUTF8,
String defaultEncoding) {
FilenameFilter filter = new FilenameFilter() {
public boolean accept(File dir, String name) {
return (name.endsWith("mrc"));
}
};
this.permissive = permissive;
this.convertToUTF8 = convertToUTF8;
list = dir.listFiles(filter);
java.util.Arrays.sort(list);
curFileNum = 0;
curFileReader = null;
this.defaultEncoding = defaultEncoding;
}
/**
* Returns true if the iteration has more records, false otherwise.
*/
public boolean hasNext() {
if (curFileReader == null || curFileReader.hasNext() == false) {
nextFile();
}
return (curFileReader == null ? false : curFileReader.hasNext());
}
private void nextFile() {
if (curFileNum != list.length) {
try {
System.err.println("Switching to input file: " +
list[curFileNum]);
if (defaultEncoding != null) {
curFileReader =
new MarcPermissiveStreamReader(new FileInputStream(
list[curFileNum++]), permissive,
convertToUTF8, defaultEncoding);
} else {
curFileReader =
new MarcPermissiveStreamReader(new FileInputStream(
list[curFileNum++]), permissive,
convertToUTF8);
}
} catch (FileNotFoundException e) {
nextFile();
}
} else {
curFileReader = null;
}
}
/**
* Returns the next record in the iteration.
*
* @return Record - the record object
*/
public Record next() {
if (curFileReader == null || curFileReader.hasNext() == false) {
nextFile();
}
return (curFileReader == null ? null : curFileReader.next());
}
}
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