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The Waikato Environment for Knowledge Analysis (WEKA), a machine
learning workbench. This is the stable version. Apart from bugfixes, this version
does not receive any other updates.
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* ConverterUtils.java
* Copyright (C) 2000 University of Waikato, Hamilton, New Zealand
*
*/
package weka.core.converters;
import weka.core.ClassDiscovery;
import weka.core.Instance;
import weka.core.Instances;
import weka.core.RevisionHandler;
import weka.core.RevisionUtils;
import weka.gui.GenericObjectEditor;
import weka.gui.GenericPropertiesCreator;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.io.StreamTokenizer;
import java.net.URL;
import java.util.Arrays;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Properties;
import java.util.Vector;
/**
* Utility routines for the converter package.
*
* @author Mark Hall ([email protected])
* @author FracPete (fracpete at waikato dot ac dot nz)
* @version $Revision: 6416 $
* @see Serializable
*/
public class ConverterUtils
implements Serializable, RevisionHandler {
/** for serialization. */
static final long serialVersionUID = -2460855349276148760L;
/**
* Helper class for loading data from files and URLs. Via the ConverterUtils
* class it determines which converter to use for loading the data into
* memory. If the chosen converter is an incremental one, then the data
* will be loaded incrementally, otherwise as batch. In both cases the
* same interface will be used (hasMoreElements,
* nextElement). Before the
* data can be read again, one has to call the reset method.
* The data source can also be initialized with an Instances object, in
* order to provide a unified interface to files and already loaded datasets.
*
* @author FracPete (fracpete at waikato dot ac dot nz)
* @version $Revision: 6416 $
* @see #hasMoreElements(Instances)
* @see #nextElement(Instances)
* @see #reset()
* @see DataSink
*/
public static class DataSource
implements Serializable, RevisionHandler {
/** for serialization. */
private static final long serialVersionUID = -613122395928757332L;
/** the file to load. */
protected File m_File;
/** the URL to load. */
protected URL m_URL;
/** the loader.*/
protected Loader m_Loader;
/** whether the loader is incremental. */
protected boolean m_Incremental;
/** the instance counter for the batch case. */
protected int m_BatchCounter;
/** the last internally read instance. */
protected Instance m_IncrementalBuffer;
/** the batch buffer. */
protected Instances m_BatchBuffer;
/**
* Tries to load the data from the file. Can be either a regular file or
* a web location (http://, https://, ftp:// or file://).
*
* @param location the name of the file to load
* @throws Exception if initialization fails
*/
public DataSource(String location) throws Exception {
super();
// file or URL?
if ( location.startsWith("http://")
|| location.startsWith("https://")
|| location.startsWith("ftp://")
|| location.startsWith("file://") )
m_URL = new URL(location);
else
m_File = new File(location);
// quick check: is it ARFF?
if (isArff(location)) {
m_Loader = new ArffLoader();
}
else {
if (m_File != null)
m_Loader = ConverterUtils.getLoaderForFile(location);
else
m_Loader = ConverterUtils.getURLLoaderForFile(location);
// do we have a converter?
if (m_Loader == null)
throw new IllegalArgumentException("No suitable converter found for '" + location + "'!");
}
// incremental loader?
m_Incremental = (m_Loader instanceof IncrementalConverter);
reset();
}
/**
* Initializes the datasource with the given dataset.
*
* @param inst the dataset to use
*/
public DataSource(Instances inst) {
super();
m_BatchBuffer = inst;
m_Loader = null;
m_File = null;
m_URL = null;
m_Incremental = false;
}
/**
* Initializes the datasource with the given Loader.
*
* @param loader the Loader to use
*/
public DataSource(Loader loader) {
super();
m_BatchBuffer = null;
m_Loader = loader;
m_File = null;
m_URL = null;
m_Incremental = (m_Loader instanceof IncrementalConverter);
initBatchBuffer();
}
/**
* Initializes the datasource with the given input stream. This stream
* is always interpreted as ARFF.
*
* @param stream the stream to use
*/
public DataSource(InputStream stream) {
super();
m_BatchBuffer = null;
m_Loader = new ArffLoader();
try {
m_Loader.setSource(stream);
}
catch (Exception e) {
m_Loader = null;
}
m_File = null;
m_URL = null;
m_Incremental = (m_Loader instanceof IncrementalConverter);
initBatchBuffer();
}
/**
* initializes the batch buffer if necessary, i.e., for non-incremental
* loaders.
*/
protected void initBatchBuffer() {
try {
if (!isIncremental())
m_BatchBuffer = m_Loader.getDataSet();
else
m_BatchBuffer = null;
}
catch (Exception e) {
e.printStackTrace();
}
}
/**
* returns whether the extension of the location is likely to be of ARFF
* format, i.e., ending in ".arff" or ".arff.gz" (case-insensitive).
*
* @param location the file location to check
* @return true if the location seems to be of ARFF format
*/
public static boolean isArff(String location) {
if ( location.toLowerCase().endsWith(ArffLoader.FILE_EXTENSION.toLowerCase())
|| location.toLowerCase().endsWith(ArffLoader.FILE_EXTENSION_COMPRESSED.toLowerCase()) )
return true;
else
return false;
}
/**
* returns whether the loader is an incremental one.
*
* @return true if the loader is a true incremental one
*/
public boolean isIncremental() {
return m_Incremental;
}
/**
* returns the determined loader, null if the DataSource was initialized
* with data alone and not a file/URL.
*
* @return the loader used for retrieving the data
*/
public Loader getLoader() {
return m_Loader;
}
/**
* returns the full dataset, can be null in case of an error.
*
* @return the full dataset
* @throws Exception if resetting of loader fails
*/
public Instances getDataSet() throws Exception {
Instances result;
result = null;
// reset the loader
reset();
try {
if (m_BatchBuffer == null)
result = m_Loader.getDataSet();
else
result = m_BatchBuffer;
}
catch (Exception e) {
e.printStackTrace();
result = null;
}
return result;
}
/**
* returns the full dataset with the specified class index set,
* can be null in case of an error.
*
* @param classIndex the class index for the dataset
* @return the full dataset
* @throws Exception if resetting of loader fails
*/
public Instances getDataSet(int classIndex) throws Exception {
Instances result;
result = getDataSet();
if (result != null)
result.setClassIndex(classIndex);
return result;
}
/**
* resets the loader.
*
* @throws Exception if resetting fails
*/
public void reset() throws Exception {
if (m_File != null)
((AbstractFileLoader) m_Loader).setFile(m_File);
else if (m_URL != null)
((URLSourcedLoader) m_Loader).setURL(m_URL.toString());
else if (m_Loader != null)
m_Loader.reset();
m_BatchCounter = 0;
m_IncrementalBuffer = null;
if (m_Loader != null) {
if (!isIncremental())
m_BatchBuffer = m_Loader.getDataSet();
else
m_BatchBuffer = null;
}
}
/**
* returns the structure of the data.
*
* @return the structure of the data
* @throws Exception if something goes wrong
*/
public Instances getStructure() throws Exception {
if (m_BatchBuffer == null)
return m_Loader.getStructure();
else
return new Instances(m_BatchBuffer, 0);
}
/**
* returns the structure of the data, with the defined class index.
*
* @param classIndex the class index for the dataset
* @return the structure of the data
* @throws Exception if something goes wrong
*/
public Instances getStructure(int classIndex) throws Exception {
Instances result;
result = getStructure();
if (result != null)
result.setClassIndex(classIndex);
return result;
}
/**
* returns whether there are more Instance objects in the data.
*
* @param structure the structure of the dataset
* @return true if there are more Instance objects
* available
* @see #nextElement(Instances)
*/
public boolean hasMoreElements(Instances structure) {
boolean result;
result = false;
if (isIncremental()) {
// user still hasn't collected the last one?
if (m_IncrementalBuffer != null) {
result = true;
}
else {
try {
m_IncrementalBuffer = m_Loader.getNextInstance(structure);
result = (m_IncrementalBuffer != null);
}
catch (Exception e) {
e.printStackTrace();
result = false;
}
}
}
else {
result = (m_BatchCounter < m_BatchBuffer.numInstances());
}
return result;
}
/**
* returns the next element and sets the specified dataset, null if
* none available.
*
* @param dataset the dataset to set for the instance
* @return the next Instance
*/
public Instance nextElement(Instances dataset) {
Instance result;
result = null;
if (isIncremental()) {
// is there still an instance in the buffer?
if (m_IncrementalBuffer != null) {
result = m_IncrementalBuffer;
m_IncrementalBuffer = null;
}
else {
try {
result = m_Loader.getNextInstance(dataset);
}
catch (Exception e) {
e.printStackTrace();
result = null;
}
}
}
else {
if (m_BatchCounter < m_BatchBuffer.numInstances()) {
result = m_BatchBuffer.instance(m_BatchCounter);
m_BatchCounter++;
}
}
if (result != null) {
result.setDataset(dataset);
}
return result;
}
/**
* convencience method for loading a dataset in batch mode.
*
* @param location the dataset to load
* @return the dataset
* @throws Exception if loading fails
*/
public static Instances read(String location) throws Exception {
DataSource source;
Instances result;
source = new DataSource(location);
result = source.getDataSet();
return result;
}
/**
* convencience method for loading a dataset in batch mode from a stream.
*
* @param stream the stream to load the dataset from
* @return the dataset
* @throws Exception if loading fails
*/
public static Instances read(InputStream stream) throws Exception {
DataSource source;
Instances result;
source = new DataSource(stream);
result = source.getDataSet();
return result;
}
/**
* convencience method for loading a dataset in batch mode.
*
* @param loader the loader to get the dataset from
* @return the dataset
* @throws Exception if loading fails
*/
public static Instances read(Loader loader) throws Exception {
DataSource source;
Instances result;
source = new DataSource(loader);
result = source.getDataSet();
return result;
}
/**
* for testing only - takes a data file as input.
*
* @param args the commandline arguments
* @throws Exception if something goes wrong
*/
public static void main(String[] args) throws Exception {
if (args.length != 1) {
System.out.println("\nUsage: " + DataSource.class.getName() + " \n");
System.exit(1);
}
DataSource loader = new DataSource(args[0]);
System.out.println("Incremental? " + loader.isIncremental());
System.out.println("Loader: " + loader.getLoader().getClass().getName());
System.out.println("Data:\n");
Instances structure = loader.getStructure();
System.out.println(structure);
while (loader.hasMoreElements(structure))
System.out.println(loader.nextElement(structure));
Instances inst = loader.getDataSet();
loader = new DataSource(inst);
System.out.println("\n\nProxy-Data:\n");
System.out.println(loader.getStructure());
while (loader.hasMoreElements(structure))
System.out.println(loader.nextElement(inst));
}
/**
* Returns the revision string.
*
* @return the revision
*/
public String getRevision() {
return RevisionUtils.extract("$Revision: 6416 $");
}
}
/**
* Helper class for saving data to files. Via the ConverterUtils
* class it determines which converter to use for saving the data.
* It is the logical counterpart to DataSource.
*
* @author FracPete (fracpete at waikato dot ac dot nz)
* @version $Revision: 6416 $
* @see DataSource
*/
public static class DataSink
implements Serializable, RevisionHandler {
/** for serialization. */
private static final long serialVersionUID = -1504966891136411204L;
/** the saver to use for storing the data. */
protected Saver m_Saver = null;
/** the stream to store the data in (always in ARFF format). */
protected OutputStream m_Stream = null;
/**
* initializes the sink to save the data to the given file.
*
* @param filename the file to save data to
* @throws Exception if set of saver fails
*/
public DataSink(String filename) throws Exception {
m_Stream = null;
if (DataSource.isArff(filename))
m_Saver = new ArffSaver();
else
m_Saver = getSaverForFile(filename);
((AbstractFileSaver) m_Saver).setFile(new File(filename));
}
/**
* initializes the sink to save the data to the given Saver (expected to be
* fully configured).
*
* @param saver the saver to use for saving the data
*/
public DataSink(Saver saver) {
m_Saver = saver;
m_Stream = null;
}
/**
* initializes the sink to save the data in the stream (always in ARFF
* format).
*
* @param stream the output stream to use for storing the data in ARFF
* format
*/
public DataSink(OutputStream stream) {
m_Saver = null;
m_Stream = stream;
}
/**
* writes the given data either via the saver or to the defined
* output stream (depending on the constructor). In case of the stream,
* the stream is only flushed, but not closed.
*
* @param data the data to save
* @throws Exception if saving fails
*/
public void write(Instances data) throws Exception {
if (m_Saver != null) {
m_Saver.setInstances(data);
m_Saver.writeBatch();
}
else {
m_Stream.write(data.toString().getBytes());
m_Stream.flush();
}
}
/**
* writes the data to the given file.
*
* @param filename the file to write the data to
* @param data the data to store
* @throws Exception if writing fails
*/
public static void write(String filename, Instances data) throws Exception {
DataSink sink;
sink = new DataSink(filename);
sink.write(data);
}
/**
* writes the data via the given saver.
*
* @param saver the saver to use for writing the data
* @param data the data to store
* @throws Exception if writing fails
*/
public static void write(Saver saver, Instances data) throws Exception {
DataSink sink;
sink = new DataSink(saver);
sink.write(data);
}
/**
* writes the data to the given stream (always in ARFF format).
*
* @param stream the stream to write the data to (ARFF format)
* @param data the data to store
* @throws Exception if writing fails
*/
public static void write(OutputStream stream, Instances data) throws Exception {
DataSink sink;
sink = new DataSink(stream);
sink.write(data);
}
/**
* for testing only - takes a data file as input and a data file for the
* output.
*
* @param args the commandline arguments
* @throws Exception if something goes wrong
*/
public static void main(String[] args) throws Exception {
if (args.length != 2) {
System.out.println(
"\nUsage: " + DataSource.class.getName() + " \n");
System.exit(1);
}
// load data
Instances data = DataSource.read(args[0]);
// save data
DataSink.write(args[1], data);
}
/**
* Returns the revision string.
*
* @return the revision
*/
public String getRevision() {
return RevisionUtils.extract("$Revision: 6416 $");
}
}
/** the core loaders - hardcoded list necessary for RMI/Remote Experiments
* (comma-separated list). */
public final static String CORE_FILE_LOADERS =
weka.core.converters.ArffLoader.class.getName() + ","
+ weka.core.converters.C45Loader.class.getName() + ","
+ weka.core.converters.CSVLoader.class.getName() + ","
+ weka.core.converters.DatabaseConverter.class.getName() + ","
+ weka.core.converters.LibSVMLoader.class.getName() + ","
+ weka.core.converters.SerializedInstancesLoader.class.getName() + ","
+ weka.core.converters.TextDirectoryLoader.class.getName() + ","
+ weka.core.converters.XRFFLoader.class.getName();
/** the core savers - hardcoded list necessary for RMI/Remote Experiments
* (comma-separated list). */
public final static String CORE_FILE_SAVERS =
weka.core.converters.ArffSaver.class.getName() + ","
+ weka.core.converters.C45Saver.class.getName() + ","
+ weka.core.converters.CSVSaver.class.getName() + ","
+ weka.core.converters.DatabaseConverter.class.getName() + ","
+ weka.core.converters.LibSVMSaver.class.getName() + ","
+ weka.core.converters.SerializedInstancesSaver.class.getName() + ","
+ weka.core.converters.XRFFSaver.class.getName();
/** all available loaders (extension <-> classname). */
protected static Hashtable m_FileLoaders;
/** all available URL loaders (extension <-> classname). */
protected static Hashtable m_URLFileLoaders;
/** all available savers (extension <-> classname). */
protected static Hashtable m_FileSavers;
// determine all loaders/savers
static {
Vector classnames;
try {
// generate properties
// Note: does NOT work with RMI, hence m_FileLoadersCore/m_FileSaversCore
GenericPropertiesCreator creator = new GenericPropertiesCreator();
creator.execute(false);
Properties props = creator.getOutputProperties();
// init
m_FileLoaders = new Hashtable();
m_URLFileLoaders = new Hashtable();
m_FileSavers = new Hashtable();
// loaders
m_FileLoaders = getFileConverters(
props.getProperty(Loader.class.getName(), CORE_FILE_LOADERS),
new String[]{FileSourcedConverter.class.getName()});
// URL loaders
m_URLFileLoaders = getFileConverters(
props.getProperty(Loader.class.getName(), CORE_FILE_LOADERS),
new String[]{
FileSourcedConverter.class.getName(),
URLSourcedLoader.class.getName()});
// savers
m_FileSavers = getFileConverters(
props.getProperty(Saver.class.getName(), CORE_FILE_SAVERS),
new String[]{FileSourcedConverter.class.getName()});
}
catch (Exception e) {
// ignore
}
finally {
// loaders
if (m_FileLoaders.size() == 0) {
classnames = GenericObjectEditor.getClassnames(AbstractFileLoader.class.getName());
if (classnames.size() > 0)
m_FileLoaders = getFileConverters(
classnames,
new String[]{FileSourcedConverter.class.getName()});
else
m_FileLoaders = getFileConverters(
CORE_FILE_LOADERS,
new String[]{FileSourcedConverter.class.getName()});
}
// URL loaders
if (m_URLFileLoaders.size() == 0) {
classnames = GenericObjectEditor.getClassnames(AbstractFileLoader.class.getName());
if (classnames.size() > 0)
m_URLFileLoaders = getFileConverters(
classnames,
new String[]{
FileSourcedConverter.class.getName(),
URLSourcedLoader.class.getName()});
else
m_URLFileLoaders = getFileConverters(
CORE_FILE_LOADERS,
new String[]{
FileSourcedConverter.class.getName(),
URLSourcedLoader.class.getName()});
}
// savers
if (m_FileSavers.size() == 0) {
classnames = GenericObjectEditor.getClassnames(AbstractFileSaver.class.getName());
if (classnames.size() > 0)
m_FileSavers = getFileConverters(
classnames,
new String[]{FileSourcedConverter.class.getName()});
else
m_FileSavers = getFileConverters(
CORE_FILE_SAVERS,
new String[]{FileSourcedConverter.class.getName()});
}
}
}
/**
* returns a hashtable with the association
* "file extension <-> converter classname" for the comma-separated list
* of converter classnames.
*
* @param classnames comma-separated list of converter classnames
* @param intf interfaces the converters have to implement
* @return hashtable with ExtensionFileFilters
*/
protected static Hashtable getFileConverters(String classnames, String[] intf) {
Vector list;
String[] names;
int i;
list = new Vector();
names = classnames.split(",");
for (i = 0; i < names.length; i++)
list.add(names[i]);
return getFileConverters(list, intf);
}
/**
* returns a hashtable with the association
* "file extension <-> converter classname" for the list of converter
* classnames.
*
* @param classnames list of converter classnames
* @param intf interfaces the converters have to implement
* @return hashtable with ExtensionFileFilters
*/
protected static Hashtable getFileConverters(Vector classnames, String[] intf) {
Hashtable result;
String classname;
Class cls;
String[] ext;
FileSourcedConverter converter;
int i;
int n;
result = new Hashtable();
for (i = 0; i < classnames.size(); i++) {
classname = (String) classnames.get(i);
// all necessary interfaces implemented?
for (n = 0; n < intf.length; n++) {
if (!ClassDiscovery.hasInterface(intf[n], classname))
continue;
}
// get data from converter
try {
cls = Class.forName(classname);
converter = (FileSourcedConverter) cls.newInstance();
ext = converter.getFileExtensions();
}
catch (Exception e) {
cls = null;
converter = null;
ext = new String[0];
}
if (converter == null)
continue;
for (n = 0; n < ext.length; n++)
result.put(ext[n], classname);
}
return result;
}
/**
* Gets token, skipping empty lines.
*
* @param tokenizer the stream tokenizer
* @throws IOException if reading the next token fails
*/
public static void getFirstToken(StreamTokenizer tokenizer)
throws IOException {
while (tokenizer.nextToken() == StreamTokenizer.TT_EOL){};
if ((tokenizer.ttype == '\'') ||
(tokenizer.ttype == '"')) {
tokenizer.ttype = StreamTokenizer.TT_WORD;
} else if ((tokenizer.ttype == StreamTokenizer.TT_WORD) &&
(tokenizer.sval.equals("?"))) {
tokenizer.ttype = '?';
}
}
/**
* Gets token.
*
* @param tokenizer the stream tokenizer
* @throws IOException if reading the next token fails
*/
public static void getToken(StreamTokenizer tokenizer) throws IOException {
tokenizer.nextToken();
if (tokenizer.ttype== StreamTokenizer.TT_EOL) {
return;
}
if ((tokenizer.ttype == '\'') ||
(tokenizer.ttype == '"')) {
tokenizer.ttype = StreamTokenizer.TT_WORD;
} else if ((tokenizer.ttype == StreamTokenizer.TT_WORD) &&
(tokenizer.sval.equals("?"))) {
tokenizer.ttype = '?';
}
}
/**
* Throws error message with line number and last token read.
*
* @param theMsg the error message to be thrown
* @param tokenizer the stream tokenizer
* @throws IOException containing the error message
*/
public static void errms(StreamTokenizer tokenizer, String theMsg)
throws IOException {
throw new IOException(theMsg + ", read " + tokenizer.toString());
}
/**
* returns a vector with the classnames of all the loaders from the
* given hashtable.
*
* @param ht the hashtable with the extension/converter relation
* @return the classnames of the loaders
*/
protected static Vector getConverters(Hashtable ht) {
Vector result;
Enumeration enm;
String converter;
result = new Vector();
// get all classnames
enm = ht.elements();
while (enm.hasMoreElements()) {
converter = enm.nextElement();
if (!result.contains(converter))
result.add(converter);
}
// sort names
Collections.sort(result);
return result;
}
/**
* tries to determine the converter to use for this kind of file, returns
* null if none can be found in the given hashtable.
*
* @param filename the file to return a converter for
* @param ht the hashtable with the relation extension/converter
* @return the converter if one was found, null otherwise
*/
protected static Object getConverterForFile(String filename, Hashtable ht) {
Object result;
String extension;
int index;
result = null;
index = filename.lastIndexOf('.');
if (index > -1) {
extension = filename.substring(index).toLowerCase();
result = getConverterForExtension(extension, ht);
// is it a compressed format?
if (extension.equals(".gz") && result == null) {
index = filename.lastIndexOf('.', index - 1);
extension = filename.substring(index).toLowerCase();
result = getConverterForExtension(extension, ht);
}
}
return result;
}
/**
* tries to determine the loader to use for this kind of extension, returns
* null if none can be found.
*
* @param extension the file extension to return a converter for
* @param ht the hashtable with the relation extension/converter
* @return the converter if one was found, null otherwise
*/
protected static Object getConverterForExtension(String extension, Hashtable ht) {
Object result;
String classname;
result = null;
classname = (String) ht.get(extension);
if (classname != null) {
try {
result = Class.forName(classname).newInstance();
}
catch (Exception e) {
result = null;
e.printStackTrace();
}
}
return result;
}
/**
* checks whether the given class is one of the hardcoded core file loaders.
*
* @param classname the class to check
* @return true if the class is one of the core loaders
* @see #CORE_FILE_LOADERS
*/
public static boolean isCoreFileLoader(String classname) {
boolean result;
String[] classnames;
classnames = CORE_FILE_LOADERS.split(",");
result = (Arrays.binarySearch(classnames, classname) >= 0);
return result;
}
/**
* returns a vector with the classnames of all the file loaders.
*
* @return the classnames of the loaders
*/
public static Vector getFileLoaders() {
return getConverters(m_FileLoaders);
}
/**
* tries to determine the loader to use for this kind of file, returns
* null if none can be found.
*
* @param filename the file to return a converter for
* @return the converter if one was found, null otherwise
*/
public static AbstractFileLoader getLoaderForFile(String filename) {
return (AbstractFileLoader) getConverterForFile(filename, m_FileLoaders);
}
/**
* tries to determine the loader to use for this kind of file, returns
* null if none can be found.
*
* @param file the file to return a converter for
* @return the converter if one was found, null otherwise
*/
public static AbstractFileLoader getLoaderForFile(File file) {
return getLoaderForFile(file.getAbsolutePath());
}
/**
* tries to determine the loader to use for this kind of extension, returns
* null if none can be found.
*
* @param extension the file extension to return a converter for
* @return the converter if one was found, null otherwise
*/
public static AbstractFileLoader getLoaderForExtension(String extension) {
return (AbstractFileLoader) getConverterForExtension(extension, m_FileLoaders);
}
/**
* returns a vector with the classnames of all the URL file loaders.
*
* @return the classnames of the loaders
*/
public static Vector getURLFileLoaders() {
return getConverters(m_URLFileLoaders);
}
/**
* tries to determine the URL loader to use for this kind of file, returns
* null if none can be found.
*
* @param filename the file to return a URL converter for
* @return the converter if one was found, null otherwise
*/
public static AbstractFileLoader getURLLoaderForFile(String filename) {
return (AbstractFileLoader) getConverterForFile(filename, m_URLFileLoaders);
}
/**
* tries to determine the URL loader to use for this kind of file, returns
* null if none can be found.
*
* @param file the file to return a URL converter for
* @return the converter if one was found, null otherwise
*/
public static AbstractFileLoader getURLLoaderForFile(File file) {
return getURLLoaderForFile(file.getAbsolutePath());
}
/**
* tries to determine the URL loader to use for this kind of extension, returns
* null if none can be found.
*
* @param extension the file extension to return a URL converter for
* @return the converter if one was found, null otherwise
*/
public static AbstractFileLoader getURLLoaderForExtension(String extension) {
return (AbstractFileLoader) getConverterForExtension(extension, m_URLFileLoaders);
}
/**
* checks whether the given class is one of the hardcoded core file savers.
*
* @param classname the class to check
* @return true if the class is one of the core savers
* @see #CORE_FILE_SAVERS
*/
public static boolean isCoreFileSaver(String classname) {
boolean result;
String[] classnames;
classnames = CORE_FILE_SAVERS.split(",");
result = (Arrays.binarySearch(classnames, classname) >= 0);
return result;
}
/**
* returns a vector with the classnames of all the file savers.
*
* @return the classnames of the savers
*/
public static Vector getFileSavers() {
return getConverters(m_FileSavers);
}
/**
* tries to determine the saver to use for this kind of file, returns
* null if none can be found.
*
* @param filename the file to return a converter for
* @return the converter if one was found, null otherwise
*/
public static AbstractFileSaver getSaverForFile(String filename) {
return (AbstractFileSaver) getConverterForFile(filename, m_FileSavers);
}
/**
* tries to determine the saver to use for this kind of file, returns
* null if none can be found.
*
* @param file the file to return a converter for
* @return the converter if one was found, null otherwise
*/
public static AbstractFileSaver getSaverForFile(File file) {
return getSaverForFile(file.getAbsolutePath());
}
/**
* tries to determine the saver to use for this kind of extension, returns
* null if none can be found.
*
* @param extension the file extension to return a converter for
* @return the converter if one was found, null otherwise
*/
public static AbstractFileSaver getSaverForExtension(String extension) {
return (AbstractFileSaver) getConverterForExtension(extension, m_FileSavers);
}
/**
* Returns the revision string.
*
* @return the revision
*/
public String getRevision() {
return RevisionUtils.extract("$Revision: 6416 $");
}
}
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