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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 m_firstBuffer;
/** Buffer for the second input (capped at 100 for incremental) */
protected transient Queue m_secondBuffer;
/** Instance event to use for incremental mode */
protected InstanceEvent m_ie = new InstanceEvent(this);
/** The structure of the first incoming dataset */
protected transient Instances m_headerOne;
/** The structure of the second incoming dataset */
protected transient Instances m_headerTwo;
/** The structure of the outgoing dataset */
protected transient Instances m_mergedHeader;
/**
* A set of copied outgoing structure instances. Used when there are string
* attributes present in the incremental case in order to prevent concurrency
* problems where string values could get clobbered in the header.
*/
protected transient List m_headerPool;
/** Used to cycle over the headers in the header pool */
protected transient AtomicInteger m_count;
/** True if string attributes are present in the incoming data */
protected boolean m_stringAttsPresent;
/** True if the step is running incrementally */
protected boolean m_runningIncrementally;
/** Indexes of the key fields for the first input */
protected int[] m_keyIndexesOne;
/** Indexes of the key fields for the second input */
protected int[] m_keyIndexesTwo;
/** Holds the internal representation of the key specification */
protected String m_keySpec = "";
/** True if we are busy */
protected boolean m_busy;
/** True if the step has been told to stop processing */
protected AtomicBoolean m_stopRequested;
/** Holds indexes of string attributes, keyed by attribute name */
protected Map m_stringAttIndexesOne;
/** Holds indexes of string attributes, keyed by attribute name */
protected Map m_stringAttIndexesTwo;
/**
* True if the first input stream is waiting due to a full buffer (incremental
* mode only)
*/
protected boolean m_firstIsWaiting;
/**
* True if the second input stream is waiting due to a full buffer
* (incremental mode only)
*/
protected boolean m_secondIsWaiting;
/**
* Default visual for data sources
*/
protected BeanVisual m_visual = new BeanVisual("Join", BeanVisual.ICON_PATH
+ "Join.gif", BeanVisual.ICON_PATH + "Join.gif");
/** Downstream steps listening to batch data events */
protected ArrayList m_dataListeners =
new ArrayList();
/** Downstream steps listening to instance events */
protected ArrayList m_instanceListeners =
new ArrayList();
/** Used for computing streaming throughput stats */
protected transient StreamThroughput m_throughput;
/**
* Small helper class for holding an instance and the values of any string
* attributes it might have. This is needed in the streaming case as the
* KnowledgeFlow only ever keeps the current instances string values in the
* header (to save memory). Since we have to buffer a certain number of
* instances from each input, it is necessary to have a separate copy of the
* string values so that they can be restored to correct values in the
* outgoing instances.
*
* @author Mark Hall (mhall{[at]}pentaho{[dot]}com)
*/
protected static class InstanceHolder implements Serializable {
/**
* For serialization
*/
private static final long serialVersionUID = -2554438923824758088L;
/** The instance */
protected Instance m_instance;
/**
* for incremental operation, if string attributes are present then we need
* to store them with each instance - since incremental streaming in the
* knowledge flow only maintains one string value in memory (and hence in
* the header) at any one time
*/
protected Map m_stringVals;
}
/**
* Constructor
*/
public Join() {
useDefaultVisual();
setLayout(new BorderLayout());
add(m_visual, BorderLayout.CENTER);
m_env = Environment.getSystemWide();
m_stopRequested = new AtomicBoolean(false);
}
/**
* Global info for the method
*
* @return the global help info
*/
public String globalInfo() {
return "Performs an inner join on two incoming datasets/instance streams (IMPORTANT: assumes that "
+ "both datasets are sorted in ascending order of the key fields). If data is not sorted then use"
+ "a Sorter step to sort both into ascending order of the key fields. Does not handle the case where"
+ "keys are not unique in one or both inputs.";
}
/**
* Set the key specification (in internal format -
* k11,k12,...,k1nKEY_SPEC_SEPARATORk21,k22,...,k2n)
*
* @param ks the keys specification
*/
public void setKeySpec(String ks) {
m_keySpec = ks;
}
/**
* Get the key specification (in internal format -
* k11,k12,...,k1nKEY_SPEC_SEPARATORk21,k22,...,k2n)
*
* @return the keys specification
*/
public String getKeySpec() {
return m_keySpec;
}
@Override
public boolean eventGeneratable(String eventName) {
// Auto-generated method stub
if (m_firstInput == null || m_secondInput == null) {
return false;
}
if (eventName.equals("instance") && m_incomingBatchConnections) {
return false;
}
if (!eventName.equals("instance") && !m_incomingBatchConnections) {
return false;
}
return true;
}
/**
* Generate the header of the output instance structure
*/
protected void generateMergedHeader() {
// check validity of key fields first
if (m_keySpec == null || m_keySpec.length() == 0) {
if (m_log != null) {
String msg = statusMessagePrefix() + "ERROR: Key fields are null!";
m_log.statusMessage(msg);
m_log.logMessage(msg);
stop();
m_busy = false;
return;
}
}
String resolvedKeySpec = m_keySpec;
try {
resolvedKeySpec = m_env.substitute(m_keySpec);
} catch (Exception ex) {
}
String[] parts = resolvedKeySpec.split(KEY_SPEC_SEPARATOR);
if (parts.length != 2) {
if (m_log != null) {
String msg =
statusMessagePrefix() + "ERROR: Invalid key specification: "
+ m_keySpec;
m_log.statusMessage(msg);
m_log.logMessage(msg);
stop();
m_busy = false;
return;
}
}
// try to parse as a Range first
for (int i = 0; i < 2; i++) {
String rangeS = parts[i].trim();
Range r = new Range();
r.setUpper(i == 0 ? m_headerOne.numAttributes() : m_headerTwo
.numAttributes());
try {
r.setRanges(rangeS);
if (i == 0) {
m_keyIndexesOne = r.getSelection();
} else {
m_keyIndexesTwo = r.getSelection();
}
} catch (IllegalArgumentException e) {
// assume a list of attribute names
String[] names = rangeS.split(",");
if (i == 0) {
m_keyIndexesOne = new int[names.length];
} else {
m_keyIndexesTwo = new int[names.length];
}
for (int j = 0; j < names.length; j++) {
String aName = names[j].trim();
Attribute anAtt =
(i == 0) ? m_headerOne.attribute(aName) : m_headerTwo
.attribute(aName);
if (anAtt == null) {
String msg =
statusMessagePrefix() + "ERROR: Invalid key attribute name: "
+ aName;
if (m_log != null) {
m_log.statusMessage(msg);
m_log.logMessage(msg);
} else {
System.err.println(msg);
}
stop();
m_busy = false;
return;
}
if (i == 0) {
m_keyIndexesOne[j] = anAtt.index();
} else {
m_keyIndexesTwo[j] = anAtt.index();
}
}
}
}
if (m_keyIndexesOne == null || m_keyIndexesTwo == null) {
if (m_log != null) {
String msg = statusMessagePrefix() + "ERROR: Key fields are null!";
m_log.statusMessage(msg);
m_log.logMessage(msg);
stop();
m_busy = false;
return;
}
}
if (m_keyIndexesOne.length != m_keyIndexesTwo.length) {
if (m_log != null) {
String msg =
statusMessagePrefix()
+ "ERROR: number of key fields are different for each input!";
m_log.statusMessage(msg);
m_log.logMessage(msg);
stop();
m_busy = false;
return;
}
}
// check types
for (int i = 0; i < m_keyIndexesOne.length; i++) {
if (m_headerOne.attribute(m_keyIndexesOne[i]).type() != m_headerTwo
.attribute(m_keyIndexesTwo[i]).type()) {
if (m_log != null) {
String msg =
statusMessagePrefix()
+ "ERROR: type of key corresponding key fields differ: "
+ "input 1 - "
+ Attribute.typeToStringShort(m_headerOne
.attribute(m_keyIndexesOne[i]))
+ " input 2 - "
+ Attribute.typeToStringShort(m_headerTwo
.attribute(m_keyIndexesTwo[i]));
m_log.statusMessage(msg);
m_log.logMessage(msg);
stop();
m_busy = false;
return;
}
}
}
ArrayList newAtts = new ArrayList();
Set nameLookup = new HashSet();
for (int i = 0; i < m_headerOne.numAttributes(); i++) {
newAtts.add((Attribute) m_headerOne.attribute(i).copy());
nameLookup.add(m_headerOne.attribute(i).name());
}
for (int i = 0; i < m_headerTwo.numAttributes(); i++) {
String name = m_headerTwo.attribute(i).name();
if (nameLookup.contains(name)) {
name = name + "_2";
}
newAtts.add(m_headerTwo.attribute(i).copy(name));
}
m_mergedHeader =
new Instances(m_headerOne.relationName() + "+"
+ m_headerTwo.relationName(), newAtts, 0);
m_ie.setStructure(m_mergedHeader);
notifyInstanceListeners(m_ie);
m_stringAttsPresent = false;
if (m_mergedHeader.checkForStringAttributes()) {
m_stringAttsPresent = true;
m_headerPool = new ArrayList();
m_count = new AtomicInteger();
for (int i = 0; i < 10; i++) {
try {
m_headerPool.add((Instances) (new SerializedObject(m_mergedHeader))
.getObject());
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
/**
* Generate a merged instance from two input instances that match on the key
* fields
*
* @param one the first input instance
* @param two the second input instance
* @return the merged instance
*/
protected synchronized Instance generateMergedInstance(InstanceHolder one,
InstanceHolder two) {
double[] vals = new double[m_mergedHeader.numAttributes()];
int count = 0;
Instances currentStructure = m_mergedHeader;
if (m_runningIncrementally && m_stringAttsPresent) {
currentStructure = m_headerPool.get(m_count.getAndIncrement() % 10);
}
for (int i = 0; i < m_headerOne.numAttributes(); i++) {
vals[count] = one.m_instance.value(i);
if (one.m_stringVals != null && one.m_stringVals.size() > 0
&& m_mergedHeader.attribute(count).isString()) {
String valToSetInHeader =
one.m_stringVals.get(one.m_instance.attribute(i).name());
currentStructure.attribute(count).setStringValue(valToSetInHeader);
vals[count] = 0;
}
count++;
}
for (int i = 0; i < m_headerTwo.numAttributes(); i++) {
vals[count] = two.m_instance.value(i);
if (two.m_stringVals != null && two.m_stringVals.size() > 0
&& m_mergedHeader.attribute(count).isString()) {
String valToSetInHeader =
one.m_stringVals.get(two.m_instance.attribute(i).name());
currentStructure.attribute(count).setStringValue(valToSetInHeader);
vals[count] = 0;
}
count++;
}
Instance newInst = new DenseInstance(1.0, vals);
newInst.setDataset(currentStructure);
return newInst;
}
@Override
public synchronized void acceptInstance(InstanceEvent e) {
if (e.m_formatNotificationOnly) {
return;
}
m_busy = true;
Object source = e.getSource();
if (e.getStatus() == InstanceEvent.FORMAT_AVAILABLE) {
m_runningIncrementally = true;
m_stopRequested.set(false);
if (!m_stopRequested.get() && source == m_firstInput
&& m_firstBuffer == null) {
System.err.println("Allocating first buffer");
m_firstFinished = false;
m_firstBuffer = new LinkedList();
m_headerOne = e.getStructure();
m_stringAttIndexesOne = new HashMap();
for (int i = 0; i < m_headerOne.numAttributes(); i++) {
if (m_headerOne.attribute(i).isString()) {
m_stringAttIndexesOne.put(m_headerOne.attribute(i).name(),
new Integer(i));
}
}
}
if (!m_stopRequested.get() && source == m_secondInput
&& m_secondBuffer == null) {
System.err.println("Allocating second buffer");
m_secondFinished = false;
m_secondBuffer = new LinkedList();
m_headerTwo = e.getStructure();
m_stringAttIndexesTwo = new HashMap();
for (int i = 0; i < m_headerTwo.numAttributes(); i++) {
if (m_headerTwo.attribute(i).isString()) {
m_stringAttIndexesTwo.put(m_headerTwo.attribute(i).name(),
new Integer(i));
}
}
}
if (m_stopRequested.get()) {
return;
}
if (m_mergedHeader == null) {
// can we determine the header?
m_throughput = new StreamThroughput(statusMessagePrefix());
if (m_headerOne != null && m_headerTwo != null && m_keySpec != null
&& m_keySpec.length() > 0) {
// construct merged header & check validity of indexes
generateMergedHeader();
}
}
} else {
if (m_stopRequested.get()) {
return;
}
Instance current = e.getInstance();
if (current == null || e.getStatus() == InstanceEvent.BATCH_FINISHED) {
if (source == m_firstInput) {
System.err.println("Finished first");
m_firstFinished = true;
}
if (source == m_secondInput) {
System.err.println("Finished second");
m_secondFinished = true;
}
}
if (current != null) {
if (source == m_firstInput) {
// m_firstBuffer.add(current);
addToFirstBuffer(current);
} else if (source == m_secondInput) {
// m_secondBuffer.add(current);
addToSecondBuffer(current);
}
}
if (source == m_firstInput && m_secondBuffer != null
&& m_secondBuffer.size() <= 100 && m_secondIsWaiting) {
notifyAll();
m_secondIsWaiting = false;
} else if (source == m_secondInput && m_firstBuffer != null
&& m_firstBuffer.size() <= 100 && m_firstIsWaiting) {
notifyAll();
m_firstIsWaiting = false;
}
if (m_firstFinished && m_secondFinished && !m_stopRequested.get()) {
// finished - now just clear buffers and reset headers etc
clearBuffers();
return;
}
if (m_stopRequested.get()) {
return;
}
m_throughput.updateStart();
Instance outputI = processBuffers();
m_throughput.updateEnd(m_log);
if (outputI != null && !m_stopRequested.get()) {
// notify instance listeners
m_ie.setStatus(InstanceEvent.INSTANCE_AVAILABLE);
m_ie.setInstance(outputI);
notifyInstanceListeners(m_ie);
}
}
}
/**
* Copy the string values out of an instance into the temporary storage in
* InstanceHolder
*
* @param holder the InstanceHolder encapsulating the instance and it's string
* values
* @param stringAttIndexes indices of string attributes in the instance
*/
private static void copyStringAttVals(InstanceHolder holder,
Map stringAttIndexes) {
for (String attName : stringAttIndexes.keySet()) {
Attribute att = holder.m_instance.dataset().attribute(attName);
String val = holder.m_instance.stringValue(att);
if (holder.m_stringVals == null) {
holder.m_stringVals = new HashMap();
}
holder.m_stringVals.put(attName, val);
}
}
/**
* Adds an instance to the first input's buffer
*
* @param inst the instance to add
*/
protected synchronized void addToFirstBuffer(Instance inst) {
if (m_stopRequested.get()) {
return;
}
InstanceHolder newH = new InstanceHolder();
newH.m_instance = inst;
copyStringAttVals(newH, m_stringAttIndexesOne);
if (!m_stopRequested.get()) {
m_firstBuffer.add(newH);
} else {
return;
}
if (m_firstBuffer.size() > 100 && !m_secondFinished) {
try {
m_firstIsWaiting = true;
wait();
} catch (InterruptedException ex) {
}
}
}
/**
* Adds an instance to the second input's buffer
*
* @param inst the instance to add
*/
protected synchronized void addToSecondBuffer(Instance inst) {
if (m_stopRequested.get()) {
return;
}
InstanceHolder newH = new InstanceHolder();
newH.m_instance = inst;
copyStringAttVals(newH, m_stringAttIndexesTwo);
if (!m_stopRequested.get()) {
m_secondBuffer.add(newH);
} else {
return;
}
if (m_secondBuffer.size() > 100 && !m_firstFinished) {
try {
m_secondIsWaiting = true;
wait();
} catch (InterruptedException e) {
}
}
}
/**
* Clear remaining instances in the buffers
*/
protected synchronized void clearBuffers() {
while (m_firstBuffer.size() > 0 && m_secondBuffer.size() > 0) {
m_throughput.updateStart();
Instance newInst = processBuffers();
m_throughput.updateEnd(m_log);
if (newInst != null) {
m_ie.setInstance(newInst);
m_ie.setStatus(InstanceEvent.INSTANCE_AVAILABLE);
notifyInstanceListeners(m_ie);
}
}
// indicate end of stream
m_ie.setInstance(null);
m_ie.setStatus(InstanceEvent.BATCH_FINISHED);
notifyInstanceListeners(m_ie);
if (m_log != null) {
m_log.statusMessage(statusMessagePrefix() + "Finished");
}
m_headerOne = null;
m_headerTwo = null;
m_mergedHeader = null;
m_firstBuffer = null;
m_secondBuffer = null;
m_firstFinished = false;
m_secondFinished = false;
m_busy = false;
}
/**
* Process the current state of the two buffers. Compares the head of both
* buffers and will return a merged instance if they match on the key fields.
* Will remove instances from one or the other buffer if it is behind
* according to the keys comparison
*
* @return a merged instance if keys match, otherwise null
*/
protected synchronized Instance processBuffers() {
if (m_firstBuffer != null && m_secondBuffer != null
&& m_firstBuffer.size() > 0 && m_secondBuffer.size() > 0) {
// System.err.println("Buffer sizes: " + m_firstBuffer.size() + " "
// + m_secondBuffer.size());
if (m_stopRequested.get()) {
return null;
}
InstanceHolder firstH = m_firstBuffer.peek();
InstanceHolder secondH = m_secondBuffer.peek();
Instance first = firstH.m_instance;
Instance second = secondH.m_instance;
// System.err.println("Keys " + first.value(0) + " " + second.value(0));
// try {
// Thread.sleep(500);
// } catch (InterruptedException ex) {
//
// }
int cmp = compare(first, second, firstH, secondH);
if (cmp == 0) {
// match on all keys - output joined instance
Instance newInst =
generateMergedInstance(m_firstBuffer.remove(),
m_secondBuffer.remove());
return newInst;
} else if (cmp < 0) {
// second is ahead of first - discard rows from first
do {
m_firstBuffer.remove();
if (m_firstBuffer.size() > 0) {
firstH = m_firstBuffer.peek();
first = firstH.m_instance;
cmp = compare(first, second, firstH, secondH);
}
} while (cmp < 0 && m_firstBuffer.size() > 0);
} else {
// first is ahead of second - discard rows from second
do {
m_secondBuffer.remove();
if (m_secondBuffer.size() > 0) {
secondH = m_secondBuffer.peek();
second = secondH.m_instance;
cmp = compare(first, second, firstH, secondH);
}
} while (cmp > 0 && m_secondBuffer.size() > 0);
}
}
return null;
}
/**
* Compares two instances according to the keys
*
* @param one the first instance
* @param two the second instance
* @param oneH the first instance holder (in case string attributes are
* present and we are running incrementally)
* @param twoH the second instance holder
* @return the comparison according to the keys
*/
protected int compare(Instance one, Instance two, InstanceHolder oneH,
InstanceHolder twoH) {
for (int i = 0; i < m_keyIndexesOne.length; i++) {
if (one.isMissing(m_keyIndexesOne[i])
&& two.isMissing(m_keyIndexesTwo[i])) {
continue;
}
if (one.isMissing(m_keyIndexesOne[i])
|| two.isMissing(m_keyIndexesTwo[i])) {
// ensure that the input with the missing value gets discarded
if (one.isMissing(m_keyIndexesOne[i])) {
return -1;
} else {
return 1;
}
}
if (m_mergedHeader.attribute(m_keyIndexesOne[i]).isNumeric()) {
double v1 = one.value(m_keyIndexesOne[i]);
double v2 = two.value(m_keyIndexesTwo[i]);
if (v1 != v2) {
return v1 < v2 ? -1 : 1;
}
} else if (m_mergedHeader.attribute(m_keyIndexesOne[i]).isNominal()) {
String oneS = one.stringValue(m_keyIndexesOne[i]);
String twoS = two.stringValue(m_keyIndexesTwo[i]);
int cmp = oneS.compareTo(twoS);
if (cmp != 0) {
return cmp;
}
} else if (m_mergedHeader.attribute(m_keyIndexesOne[i]).isString()) {
String attNameOne = m_mergedHeader.attribute(m_keyIndexesOne[i]).name();
String attNameTwo = m_mergedHeader.attribute(m_keyIndexesTwo[i]).name();
String oneS =
oneH.m_stringVals == null || oneH.m_stringVals.size() == 0 ? one
.stringValue(m_keyIndexesOne[i]) : oneH.m_stringVals
.get(attNameOne);
String twoS =
twoH.m_stringVals == null || twoH.m_stringVals.size() == 0 ? two
.stringValue(m_keyIndexesTwo[i]) : twoH.m_stringVals
.get(attNameTwo);
int cmp = oneS.compareTo(twoS);
if (cmp != 0) {
return cmp;
}
}
}
return 0;
}
/**
* Accept and process a test set
*
* @param e the test set event encapsulating the test set
*/
@Override
public void acceptTestSet(TestSetEvent e) {
DataSetEvent de = new DataSetEvent(e.getSource(), e.getTestSet());
acceptDataSet(de);
}
/**
* Accept and process a training set
*
* @param e the training set event encapsulating the training set
*/
@Override
public void acceptTrainingSet(TrainingSetEvent e) {
DataSetEvent de = new DataSetEvent(e.getSource(), e.getTrainingSet());
acceptDataSet(de);
}
/**
* Accept and process a data set
*
* @param e the data set event encapsulating the data set
*/
@Override
public synchronized void acceptDataSet(DataSetEvent e) {
m_runningIncrementally = false;
m_stopRequested.set(false);
if (e.getSource() == m_firstInput) {
if (e.isStructureOnly() || e.getDataSet().numInstances() == 0) {
m_headerOne = e.getDataSet();
return;
}
if (m_headerOne == null) {
m_headerOne = new Instances(e.getDataSet(), 0);
}
m_firstBuffer = new LinkedList();
for (int i = 0; i < e.getDataSet().numInstances()
&& !m_stopRequested.get(); i++) {
InstanceHolder tempH = new InstanceHolder();
tempH.m_instance = e.getDataSet().instance(i);
m_firstBuffer.add(tempH);
}
} else if (e.getSource() == m_secondInput) {
if (e.isStructureOnly() || e.getDataSet().numInstances() == 0) {
m_headerTwo = e.getDataSet();
return;
}
if (m_headerTwo == null) {
m_headerTwo = new Instances(e.getDataSet(), 0);
}
m_secondBuffer = new LinkedList();
for (int i = 0; i < e.getDataSet().numInstances()
&& !m_stopRequested.get(); i++) {
InstanceHolder tempH = new InstanceHolder();
tempH.m_instance = e.getDataSet().instance(i);
m_secondBuffer.add(tempH);
}
}
if (m_firstBuffer != null && m_firstBuffer.size() > 0
&& m_secondBuffer != null && m_secondBuffer.size() > 0) {
m_busy = true;
generateMergedHeader();
DataSetEvent dse = new DataSetEvent(this, m_mergedHeader);
notifyDataListeners(dse);
Instances newData = new Instances(m_mergedHeader, 0);
while (!m_stopRequested.get() && m_firstBuffer.size() > 0
&& m_secondBuffer.size() > 0) {
Instance newI = processBuffers();
if (newI != null) {
newData.add(newI);
}
}
if (!m_stopRequested.get()) {
dse = new DataSetEvent(this, newData);
notifyDataListeners(dse);
}
m_busy = false;
m_headerOne = null;
m_headerTwo = null;
m_mergedHeader = null;
m_firstBuffer = null;
m_secondBuffer = null;
}
}
/**
* Add a data source listener
*
* @param dsl the data source listener to add
*/
@Override
public void addDataSourceListener(DataSourceListener dsl) {
m_dataListeners.add(dsl);
}
/**
* Remove a data souce listener
*
* @param dsl the data source listener to remove
*/
@Override
public void removeDataSourceListener(DataSourceListener dsl) {
m_dataListeners.remove(dsl);
}
/**
* Add an instance listener
*
* @param dsl the instance listener to add
*/
@Override
public void addInstanceListener(InstanceListener dsl) {
m_instanceListeners.add(dsl);
}
/**
* Remove an instance listener
*
* @param dsl the instance listener to remove
*/
@Override
public void removeInstanceListener(InstanceListener dsl) {
m_instanceListeners.remove(dsl);
}
/**
* Use the default visual for this step
*/
@Override
public void useDefaultVisual() {
m_visual.loadIcons(BeanVisual.ICON_PATH + "Join.gif", BeanVisual.ICON_PATH
+ "Join.gif");
m_visual.setText("Join");
}
/**
* Set the visual for this step
*
* @param newVisual the visual to use
*/
@Override
public void setVisual(BeanVisual newVisual) {
m_visual = newVisual;
}
/**
* Get the visual for this step
*
* @return the visual (icon)
*/
@Override
public BeanVisual getVisual() {
return m_visual;
}
/**
* Set a custom name for this step
*
* @param name the custom name to use
*/
@Override
public void setCustomName(String name) {
m_visual.setText(name);
}
/**
* Get the custom name of this step
*
* @return the custom name of this step
*/
@Override
public String getCustomName() {
return m_visual.getText();
}
/**
* Attempt to stop processing
*/
@Override
public void stop() {
if (m_firstInput != null && m_firstInput instanceof BeanCommon) {
((BeanCommon) m_firstInput).stop();
}
if (m_secondInput != null && m_secondInput instanceof BeanCommon) {
((BeanCommon) m_secondInput).stop();
}
if (m_log != null) {
m_log.statusMessage(statusMessagePrefix() + "Stopped");
}
m_busy = false;
m_stopRequested.set(true);
try {
Thread.sleep(500);
} catch (InterruptedException ex) {
}
if (m_firstIsWaiting || m_secondIsWaiting) {
notifyAll();
}
m_firstBuffer = null;
m_secondBuffer = null;
m_headerOne = null;
m_headerTwo = null;
m_firstFinished = false;
m_secondFinished = false;
m_mergedHeader = null;
}
/**
* Returns true if we are doing something
*
* @return true if processing is occurring
*/
@Override
public boolean isBusy() {
return m_busy;
}
/**
* Set a log to use
*
* @param logger the log to use
*/
@Override
public void setLog(Logger logger) {
m_log = logger;
}
/**
* Returns true if the named connection can be made at this time
*
* @param esd the event set descriptor of the connection
* @return true if the connection is allowed
*/
@Override
public boolean connectionAllowed(EventSetDescriptor esd) {
return connectionAllowed(esd.getName());
}
/**
* Returns true if the named connection can be made at this time
*
* @param eventName the name of the connection
* @return true if the connection is allowed
*/
@Override
public boolean connectionAllowed(String eventName) {
if (m_firstInput != null && m_secondInput != null) {
return false;
}
if (m_firstInput == null || m_secondInput == null) {
if (m_firstInput != null) {
if (m_firstInputConnectionType.equals("instance")
&& !eventName.equals("instance")) {
return false;
} else if (!m_firstInputConnectionType.equals("instance")
&& eventName.equals("instance")) {
return false;
}
return true;
} else if (m_secondInput != null) {
if (m_secondInputConnectionType.equals("instance")
&& !eventName.equals("instance")) {
return false;
} else if (!m_secondInputConnectionType.equals("instance")
&& eventName.equals("instance")) {
return false;
}
return true;
}
// both unset as yet
return true;
}
return false;
}
/**
* Deals with a new connection
*
* @param eventName the event type of the connection
* @param source the source step
*/
@Override
public void connectionNotification(String eventName, Object source) {
if (connectionAllowed(eventName)) {
if (m_firstInput == null) {
m_firstInput = source;
m_firstInputConnectionType = eventName;
} else {
m_secondInput = source;
m_secondInputConnectionType = eventName;
}
}
if (m_firstInput != null && m_secondInput != null) {
if (m_firstInputConnectionType.length() > 0
|| m_secondInputConnectionType.length() > 0) {
if (!m_firstInputConnectionType.equals("instance")
&& !m_secondInputConnectionType.equals("instance")) {
m_incomingBatchConnections = true;
} else {
m_incomingBatchConnections = false;
}
} else {
m_incomingBatchConnections = false;
}
}
}
/**
* Handles cleanup when an upstream step disconnects
*
* @param eventName the event type of the connection
* @param source the source step
*/
@Override
public void disconnectionNotification(String eventName, Object source) {
if (source == m_firstInput) {
m_firstInput = null;
m_firstInputConnectionType = "";
} else if (source == m_secondInput) {
m_secondInput = null;
m_secondInputConnectionType = "";
}
if (m_firstInput != null && m_secondInput != null) {
if (m_firstInputConnectionType.length() > 0
|| m_secondInputConnectionType.length() > 0) {
if (!m_firstInputConnectionType.equals("instance")
&& !m_secondInputConnectionType.equals("instance")) {
m_incomingBatchConnections = true;
} else {
m_incomingBatchConnections = false;
}
} else {
m_incomingBatchConnections = false;
}
}
}
/**
* Unique prefix to use for status messages to the log
*
* @return the prefix to use
*/
private String statusMessagePrefix() {
return getCustomName() + "$" + hashCode() + "|";
}
/**
* Notify instance listeners of an output instance
*
* @param e the event to notify with
*/
private void notifyInstanceListeners(InstanceEvent e) {
for (InstanceListener il : m_instanceListeners) {
il.acceptInstance(e);
}
}
/**
* Notify data listeners of an output data set
*
* @param e the event to notify with
*/
private void notifyDataListeners(DataSetEvent e) {
for (DataSourceListener l : m_dataListeners) {
l.acceptDataSet(e);
}
}
/**
* Get the incoming instance structure from the first upstream step (if
* possible)
*
* @return the incoming instance structure of the first upstream step
*/
protected Instances getUpstreamStructureFirst() {
if (m_firstInput != null && m_firstInput instanceof StructureProducer) {
return ((StructureProducer) m_firstInput)
.getStructure(m_firstInputConnectionType);
}
return null;
}
/**
* Get the incoming instance structure from the second upstream step (if
* possible)
*
* @return the incoming instance structure of the second upstream step
*/
protected Instances getUpstreamStructureSecond() {
if (m_secondInput != null && m_secondInput instanceof StructureProducer) {
return ((StructureProducer) m_secondInput)
.getStructure(m_secondInputConnectionType);
}
return null;
}
/**
* Get the first input step
*
* @return the first input step
*/
protected Object getFirstInput() {
return m_firstInput;
}
/**
* Get the first input structure
*
* @return the first incoming instance structure (or null if unavailable)
*/
protected Instances getFirstInputStructure() {
Instances result = null;
if (m_firstInput instanceof StructureProducer) {
result =
((StructureProducer) m_firstInput)
.getStructure(m_firstInputConnectionType);
}
return result;
}
/**
* Get the second input step
*
* @return the second input step
*/
protected Object getSecondInput() {
return m_secondInput;
}
/**
* Get the second input structure
*
* @return the second incoming instance structure (or null if unavailable)
*/
protected Instances getSecondInputStructure() {
Instances result = null;
if (m_secondInput instanceof StructureProducer) {
result =
((StructureProducer) m_secondInput)
.getStructure(m_secondInputConnectionType);
}
return result;
}
/**
* Get the output instances structure given an input event type
*
* @param eventName the name of the input event type
* @return the output instances structure (or null)
*/
@Override
public Instances getStructure(String eventName) {
if (!eventName.equals("dataSet") && !eventName.equals("instance")) {
return null;
}
if (eventName.equals("dataSet") && m_dataListeners.size() == 0) {
return null;
}
if (eventName.equals("instance") && m_instanceListeners.size() == 0) {
return null;
}
if (m_mergedHeader == null) {
generateMergedHeader();
}
return m_mergedHeader;
}
/**
* Set environment variables to use
*
* @param env the environment variables to use
*/
@Override
public void setEnvironment(Environment env) {
m_env = env;
}
}
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