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The Waikato Environment for Knowledge Analysis (WEKA), a machine
learning workbench. This version represents the developer version, the
"bleeding edge" of development, you could say. New functionality gets added
to this version.
/*
* 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 FLOW_FILE_EXTENSIONS =
new ArrayList();
// register default loader for JSON flow files
static {
PluginManager.addPlugin(FlowLoader.class.getCanonicalName(),
JSONFlowLoader.class.getCanonicalName(),
JSONFlowLoader.class.getCanonicalName(), true);
// TODO temporary (move to a package later)
PluginManager.addPlugin(FlowLoader.class.getCanonicalName(),
LegacyFlowLoader.class.getCanonicalName(),
LegacyFlowLoader.class.getCanonicalName(), true);
Set flowLoaders =
PluginManager.getPluginNamesOfType(FlowLoader.class.getCanonicalName());
if (flowLoaders != null) {
try {
for (String f : flowLoaders) {
FlowLoader fl =
(FlowLoader) PluginManager.getPluginInstance(
FlowLoader.class.getCanonicalName(), f);
String extension = fl.getFlowFileExtension();
String description = fl.getFlowFileExtensionDescription();
FLOW_FILE_EXTENSIONS.add(new ExtensionFileFilter("." + extension,
description + " (*." + extension + ")"));
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
/** Holds the Steps in this Flow, keyed by step name */
protected Map m_flowSteps =
new LinkedHashMap();
/** The name of this flow */
protected String m_flowName = "Untitled";
/**
* Utility method to get a FlowLoader implementation suitable for loading a
* flow with the supplied file extension.
*
* @param flowFileExtension the file extension to get a FlowLoader for
* @param log the log in use
* @return a FlowLoader
* @throws WekaException if a problem occurs
*/
public static FlowLoader getFlowLoader(String flowFileExtension, Logger log)
throws WekaException {
Set availableLoaders =
PluginManager.getPluginNamesOfType(FlowLoader.class.getCanonicalName());
FlowLoader result = null;
if (availableLoaders != null) {
try {
for (String l : availableLoaders) {
FlowLoader candidate =
(FlowLoader) PluginManager.getPluginInstance(
FlowLoader.class.getCanonicalName(), l);
if (candidate.getFlowFileExtension().equalsIgnoreCase(
flowFileExtension)) {
result = candidate;
break;
}
}
} catch (Exception ex) {
throw new WekaException(ex);
}
}
if (result != null) {
result.setLog(log);
}
return result;
}
/**
* Utility method to load a flow from a file
*
* @param flowFile the file to load from
* @param log the log to use
* @return the loaded Flow
* @throws WekaException if a problem occurs
*/
public static Flow loadFlow(File flowFile, Logger log) throws WekaException {
String extension = "kf";
if (flowFile.toString().lastIndexOf('.') > 0) {
extension =
flowFile.toString().substring(flowFile.toString().lastIndexOf('.') + 1,
flowFile.toString().length());
}
FlowLoader toUse = getFlowLoader(extension, log);
if (toUse == null) {
throw new WekaException("Was unable to find a loader for flow file: "
+ flowFile.toString());
}
return toUse.readFlow(flowFile);
}
/**
* Utility method to load a flow from the supplied input stream using the
* supplied FlowLoader
*
* @param is the input stream to load from
* @param loader the FlowLoader to use
* @return the loaded Flow
* @throws WekaException if a problem occurs
*/
public static Flow loadFlow(InputStream is, FlowLoader loader)
throws WekaException {
return loader.readFlow(is);
}
/**
* Utility method to load a flow from the supplied reader using the supplied
* FlowLoader
*
* @param r the reader to load from
* @param loader the FlowLoader to use
* @return the loaded flow
* @throws WekaException if a problem occurs
*/
public static Flow loadFlow(Reader r, FlowLoader loader) throws WekaException {
return loader.readFlow(r);
}
/**
* Parse a Flow from the supplied JSON string
*
* @param flowJSON the JSON string to parse
* @return the Flow
* @throws WekaException if a problem occurs
*/
public static Flow JSONToFlow(String flowJSON) throws WekaException {
return JSONToFlow(flowJSON, false);
}
/**
* Parse a Flow from the supplied JSON string
*
* @param flowJSON the JSON string to parse
* @param dontComplainAboutMissingConnections true to not raise an exception
* if there are connections to non-existent Steps in the JSON flow
* @return the Flow
* @throws WekaException if a problem occurs
*/
public static Flow JSONToFlow(String flowJSON,
boolean dontComplainAboutMissingConnections) throws WekaException {
return JSONFlowUtils.JSONToFlow(flowJSON,
dontComplainAboutMissingConnections);
}
/**
* Save this Flow to the supplied File
*
* @param file the File to save to
* @throws WekaException if a problem occurs
*/
public void saveFlow(File file) throws WekaException {
JSONFlowUtils.writeFlow(this, file);
}
/**
* Get the name of this Flow
*
* @return the name of this flow
*/
public String getFlowName() {
return m_flowName;
}
/**
* Set the name of this Flow
*
* @param name the name to set
*/
public void setFlowName(String name) {
m_flowName = name;
}
/**
* Get an ID string for this flow. The ID is made up of the FlowName + "_" +
* the hashcode generated from the JSON representation of the flow.
*
* @return
*/
public String getFlowID() {
String ID = getFlowName();
try {
ID += "_" + toJSON().hashCode();
} catch (WekaException ex) {
ex.printStackTrace();
}
return ID;
}
/**
* All all steps in the supplied list to this Flow
*
* @param steps a list of StepManagers for the steps to add
*/
public synchronized void addAll(List steps) {
for (StepManagerImpl s : steps) {
addStep(s);
}
}
/**
* Add the given Step to this flow
*
* @param manager the StepManager containing the Step to add
*/
public synchronized void addStep(StepManagerImpl manager) {
// int ID = manager.getManagedStep().hashCode();
// scan for steps that already have the same name as the step being added
String toAddName = manager.getManagedStep().getName();
if (toAddName != null && toAddName.length() > 0) {
boolean exactMatch = false;
int maxCopyNum = 1;
for (Map.Entry e : m_flowSteps.entrySet()) {
String compName = e.getValue().getManagedStep().getName();
if (toAddName.equals(compName)) {
exactMatch = true;
} else {
if (compName.startsWith(toAddName)) {
String num = compName.replace(toAddName, "");
try {
int compNum = Integer.parseInt(num);
if (compNum > maxCopyNum) {
maxCopyNum = compNum;
}
} catch (NumberFormatException ex) {
}
}
}
}
if (exactMatch) {
maxCopyNum++;
toAddName += "" + maxCopyNum;
manager.getManagedStep().setName(toAddName);
}
}
m_flowSteps.put(toAddName, manager);
}
/**
* Connect the supplied source and target steps using the given
* connectionType. The connection will be successful only if both source and
* target are actually part of this Flow, and the target is able to accept the
* connection at this time.
*
* @param source the StepManager for the source step
* @param target the StepManager for the target step
* @param connectionType the connection type to use
* says it can accept the connection type at this time)
* @return true if the connection was successful
*/
public synchronized boolean connectSteps(StepManagerImpl source,
StepManagerImpl target, String connectionType) {
return connectSteps(source, target, connectionType, false);
}
/**
* Connect the supplied source and target steps using the given
* connectionType. The connection will be successful only if both source and
* target are actually part of this Flow, and the target is able to accept the
* connection at this time.
*
* @param source the StepManager for the source step
* @param target the StepManager for the target step
* @param connectionType the connection type to use
* @param force true to force the connection (i.e. even if the target step
* says it can accept the connection type at this time)
* @return true if the connection was successful
*/
public synchronized boolean connectSteps(StepManagerImpl source,
StepManagerImpl target, String connectionType, boolean force) {
boolean connSuccessful = false;
// make sure we contain both these steps!
if (findStep(source.getName()) == source
&& findStep(target.getName()) == target) {
// this takes care of ensuring that the target can accept
// the connection at this time and the creation of the
// incoming connection on the target
connSuccessful = source.addOutgoingConnection(connectionType, target, force);
}
return connSuccessful;
}
/**
* Rename the supplied step with the supplied name
*
* @param step the StepManager of the Step to rename
* @param newName the new name to give the step
* @throws WekaException if the Step is not part of this Flow.
*/
public synchronized void renameStep(StepManagerImpl step, String newName)
throws WekaException {
renameStep(step.getName(), newName);
}
/**
* Rename a Step.
*
* @param oldName the name of the Step to rename
* @param newName the new name to use
* @throws WekaException if the named Step is not part of this flow
*/
public synchronized void renameStep(String oldName, String newName)
throws WekaException {
if (!m_flowSteps.containsKey(oldName)) {
throw new WekaException("Step " + oldName
+ " does not seem to be part of the flow!");
}
StepManagerImpl toRename = m_flowSteps.remove(oldName);
toRename.getManagedStep().setName(newName);
m_flowSteps.put(newName, toRename);
}
/**
* Remove the supplied Step from this flow
*
* @param manager the StepManager of the Step to remove
* @throws WekaException if the step is not part of this flow
*/
public synchronized void removeStep(StepManagerImpl manager)
throws WekaException {
// int ID = manager.getManagedStep().hashCode();
if (!m_flowSteps.containsKey(manager.getManagedStep().getName())) {
throw new WekaException("Step " + manager.getManagedStep().getName()
+ " does not seem to be part of the flow!");
}
m_flowSteps.remove(manager.getManagedStep().getName());
manager.clearAllConnections();
// remove from the map & disconnect from other steps!
for (Map.Entry e : m_flowSteps.entrySet()) {
e.getValue().disconnectStep(manager.getManagedStep());
}
}
/**
* Get a list of the Steps in this Flow
*
* @return a list of StepManagers of the steps in this flow
*/
public List getSteps() {
return new ArrayList(m_flowSteps.values());
}
/**
* Get an Iterator over the Steps in this flow
*
* @return an Iterator over the StepManagers of the Steps in this flow
*/
public Iterator iterator() {
return m_flowSteps.values().iterator();
}
/**
* Get the number of steps in this flow
*
* @return the number of steps in this flow
*/
public int size() {
return m_flowSteps.size();
}
/**
* Find a Step by name
*
* @param stepName the name of the Step to find
* @return the StepManager of the named Step, or null if the Step is not part
* of this flow
*/
public StepManagerImpl findStep(String stepName) {
return m_flowSteps.get(stepName);
}
/**
* Get a list of potential start points in this Flow. Potential start points
* are those steps that have no incoming connections.
*
* @return a list of potential start points
*/
public List findPotentialStartPoints() {
List startPoints = new ArrayList();
// potential start points will have no incoming connections...
for (Map.Entry e : m_flowSteps.entrySet()) {
StepManagerImpl candidate = e.getValue();
if (candidate.getIncomingConnections().size() == 0) {
startPoints.add(candidate);
}
}
return startPoints;
}
/**
* Initialize the flow by setting the execution environment and calling the
* init() method of each step
*
* @param executor the flow executor being used to execute the flow
* @return false if initialization failed
* @throws WekaException if a problem occurs during flow initialization
*/
public boolean initFlow(FlowExecutor executor) throws WekaException {
boolean initOK = true;
// first set the execution environment
for (Map.Entry s : m_flowSteps.entrySet()) {
s.getValue().setExecutionEnvironment(executor.getExecutionEnvironment());
}
// scan for any SetVariables steps so that we can init() those first...
for (Map.Entry s : m_flowSteps.entrySet()) {
if (s.getValue().getManagedStep() instanceof SetVariables) {
if (!s.getValue().initStep()) {
initOK = false;
break;
}
}
}
if (initOK) {
// now call init() on each step
for (Map.Entry s : m_flowSteps.entrySet()) {
if (!s.getValue().initStep()) {
initOK = false;
break;
}
}
}
return initOK;
}
/**
* Return the JSON encoded version of this Flow
*
* @return the flow in JSON format
* @throws WekaException if a problem occurs
*/
public String toJSON() throws WekaException {
return JSONFlowUtils.flowToJSON(this);
}
/**
* Make a copy of this Flow
*
* @return a copy of this Flow
* @throws WekaException if a problem occurs
*/
public Flow copyFlow() throws WekaException {
return JSONToFlow(toJSON());
}
}
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