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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 3 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, see .
*/
/*
* AbstractSaver.java
* Copyright (C) 2004-2012 University of Waikato, Hamilton, New Zealand
*
*/
package weka.core.converters;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import weka.core.Capabilities;
import weka.core.CapabilitiesHandler;
import weka.core.CapabilitiesIgnorer;
import weka.core.Instance;
import weka.core.Instances;
/**
* Abstract class for Saver
*
* @author Richard Kirkby ([email protected])
* @author Stefan Mutter ([email protected])
* @version $Revision: 11006 $
*/
public abstract class AbstractSaver implements Saver, CapabilitiesHandler,
CapabilitiesIgnorer {
/** ID to avoid warning */
private static final long serialVersionUID = -27467499727819258L;
/** The write modes */
protected static final int WRITE = 0;
protected static final int WAIT = 1;
protected static final int CANCEL = 2;
protected static final int STRUCTURE_READY = 3;
/** The instances that should be stored */
private Instances m_instances;
/** The current retrieval mode */
protected int m_retrieval;
/** The current write mode */
private int m_writeMode;
/** Whether capabilities should not be checked */
protected boolean m_DoNotCheckCapabilities = false;
/**
* Returns the tip text for this property
*
* @return tip text for this property suitable for displaying in the
* explorer/experimenter gui
*/
public String doNotCheckCapabilitiesTipText() {
return "If set, saver capabilities are not checked"
+ " (Use with caution to reduce runtime).";
}
/**
* Set whether not to check capabilities.
*
* @param doNotCheckCapabilities true if capabilities are not to be checked.
*/
public void setDoNotCheckCapabilities(boolean doNotCheckCapabilities) {
m_DoNotCheckCapabilities = doNotCheckCapabilities;
}
/**
* Get whether capabilities checking is turned off.
*
* @return true if capabilities checking is turned off.
*/
public boolean getDoNotCheckCapabilities() {
return m_DoNotCheckCapabilities;
}
/**
* resets the options
*
*/
public void resetOptions() {
m_instances = null;
m_writeMode = WAIT;
}
/** Resets the structure (header information of the instances) */
public void resetStructure() {
m_instances = null;
m_writeMode = WAIT;
}
/**
* Sets the retrieval mode.
*
* @param mode the retrieval mode
*/
@Override
public void setRetrieval(int mode) {
m_retrieval = mode;
}
/**
* Gets the retrieval mode.
*
* @return the retrieval mode
*/
protected int getRetrieval() {
return m_retrieval;
}
/**
* Sets the write mode.
*
* @param mode the write mode
*/
protected void setWriteMode(int mode) {
m_writeMode = mode;
}
/**
* Gets the write mode.
*
* @return the write mode
*/
@Override
public int getWriteMode() {
return m_writeMode;
}
/**
* Sets instances that should be stored.
*
* @param instances the instances
*/
@Override
public void setInstances(Instances instances) {
Capabilities cap = getCapabilities();
if (!cap.test(instances)) {
throw new IllegalArgumentException(cap.getFailReason());
}
if (m_retrieval == INCREMENTAL) {
if (setStructure(instances) == CANCEL) {
cancel();
}
} else {
m_instances = instances;
}
}
/**
* Gets instances that should be stored.
*
* @return the instances
*/
public Instances getInstances() {
return m_instances;
}
/**
* Default implementation throws an IOException.
*
* @param file the File
* @exception IOException always
*/
@Override
public void setDestination(File file) throws IOException {
throw new IOException("Writing to a file not supported");
}
/**
* Default implementation throws an IOException.
*
* @param output the OutputStream
* @exception IOException always
*/
@Override
public void setDestination(OutputStream output) throws IOException {
throw new IOException("Writing to an outputstream not supported");
}
/**
* Returns the Capabilities of this saver. Derived savers have to override
* this method to enable capabilities.
*
* @return the capabilities of this object
* @see Capabilities
*/
@Override
public Capabilities getCapabilities() {
Capabilities result = new Capabilities(this);
result.setMinimumNumberInstances(0);
return result;
}
/**
* Sets the strcuture of the instances for the first step of incremental
* saving. The instances only need to have a header.
*
* @param headerInfo an instances object.
* @return the appropriate write mode
*/
public int setStructure(Instances headerInfo) {
Capabilities cap = getCapabilities();
if (!cap.test(headerInfo)) {
throw new IllegalArgumentException(cap.getFailReason());
}
if (m_writeMode == WAIT && headerInfo != null) {
m_instances = headerInfo;
m_writeMode = STRUCTURE_READY;
} else {
if ((headerInfo == null) || !(m_writeMode == STRUCTURE_READY)
|| !headerInfo.equalHeaders(m_instances)) {
m_instances = null;
if (m_writeMode != WAIT) {
System.err
.println("A structure cannot be set up during an active incremental saving process.");
}
m_writeMode = CANCEL;
}
}
return m_writeMode;
}
/** Cancels the incremental saving process if the write mode is CANCEL. */
public void cancel() {
if (m_writeMode == CANCEL) {
resetOptions();
}
}
/**
* Method for incremental saving. Standard behaviour: no incremental saving is
* possible, therefore throw an IOException. An incremental saving process is
* stopped by calling this method with null.
*
* @param i the instance to be saved
* @throws IOException IOEXception if the instance acnnot be written to the
* specified destination
*/
@Override
public void writeIncremental(Instance i) throws IOException {
throw new IOException("No Incremental saving possible.");
}
/**
* Writes to a file in batch mode To be overridden.
*
* @throws IOException exception if writting is not possible
*/
@Override
public abstract void writeBatch() throws IOException;
/**
* Default implementation throws an IOException.
*
* @exception IOException always
*/
@Override
public String getFileExtension() throws Exception {
throw new Exception("Saving in a file not supported.");
}
/**
* Default implementation throws an IOException.
*
* @param file the File
* @exception IOException always
*/
@Override
public void setFile(File file) throws IOException {
throw new IOException("Saving in a file not supported.");
}
/**
* Default implementation throws an IOException.
*
* @param prefix the file prefix
* @exception IOException always
*/
@Override
public void setFilePrefix(String prefix) throws Exception {
throw new Exception("Saving in a file not supported.");
}
/**
* Default implementation throws an IOException.
*
* @exception IOException always
*/
@Override
public String filePrefix() throws Exception {
throw new Exception("Saving in a file not supported.");
}
/**
* Default implementation throws an IOException.
*
* @param dir the name of the directory to save in
* @exception IOException always
*/
@Override
public void setDir(String dir) throws IOException {
throw new IOException("Saving in a file not supported.");
}
/**
* Default implementation throws an IOException.
*
* @param relationName
* @param add
* @exception IOException always
*/
@Override
public void setDirAndPrefix(String relationName, String add)
throws IOException {
throw new IOException("Saving in a file not supported.");
}
/**
* Default implementation throws an IOException.
*
* @exception IOException always
*/
@Override
public String retrieveDir() throws IOException {
throw new IOException("Saving in a file not supported.");
}
}