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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 getDownstreamStepNames() {
List result = new ArrayList();
for (List o : getStepManager().getOutgoingConnections()
.values()) {
for (StepManager m : o) {
result.add(m.getName());
}
}
return result;
}
/**
* Initialize the step.
*
* @throws WekaException if a problem occurs during initialization
*/
@Override
public void stepInit() throws WekaException {
m_isReset = true;
m_streamingData = null;
// see if the specified downstream steps are connected
m_validTrueStep =
getStepManager().getOutgoingConnectedStepWithName(
environmentSubstitute(m_customNameOfTrueStep)) != null;
m_validFalseStep =
getStepManager().getOutgoingConnectedStepWithName(
environmentSubstitute(m_customNameOfFalseStep)) != null;
m_incomingStructure = null;
if (m_expressionString == null || m_expressionString.length() == 0) {
throw new WekaException("No expression defined!");
}
}
/**
* Get a list of incoming connection types that this step can accept. Ideally
* (and if appropriate), this should take into account the state of the step
* and any existing incoming connections. E.g. a step might be able to accept
* one (and only one) incoming batch data connection.
*
* @return a list of incoming connections that this step can accept given its
* current state
*/
@Override
public List getIncomingConnectionTypes() {
if (getStepManager().numIncomingConnections() == 0) {
return Arrays.asList(StepManager.CON_DATASET,
StepManager.CON_TRAININGSET, StepManager.CON_TESTSET,
StepManager.CON_INSTANCE);
}
if (getStepManager().numIncomingConnectionsOfType(StepManager.CON_INSTANCE) == 0) {
return Arrays.asList(StepManager.CON_DATASET,
StepManager.CON_TRAININGSET, StepManager.CON_TESTSET);
}
return null;
}
/**
* Get a list of outgoing connection types that this step can produce. Ideally
* (and if appropriate), this should take into account the state of the step
* and the incoming connections. E.g. depending on what incoming connection is
* present, a step might be able to produce a trainingSet output, a testSet
* output or neither, but not both.
*
* @return a list of outgoing connections that this step can produce
*/
@Override
public List getOutgoingConnectionTypes() {
List result = new ArrayList();
if (getStepManager().numIncomingConnectionsOfType(StepManager.CON_INSTANCE) > 0) {
result.add(StepManager.CON_INSTANCE);
} else if (getStepManager().numIncomingConnections() > 0) {
if (getStepManager()
.numIncomingConnectionsOfType(StepManager.CON_DATASET) > 0) {
result.add(StepManager.CON_DATASET);
}
if (getStepManager().numIncomingConnectionsOfType(
StepManager.CON_TRAININGSET) > 0) {
result.add(StepManager.CON_TRAININGSET);
}
if (getStepManager()
.numIncomingConnectionsOfType(StepManager.CON_TESTSET) > 0) {
result.add(StepManager.CON_TESTSET);
}
}
return result;
}
/**
* If possible, get the output structure for the named connection type as a
* header-only set of instances. Can return null if the specified connection
* type is not representable as Instances or cannot be determined at present.
*
* @param connectionName the name of the connection type to get the output
* structure for
* @return the output structure as a header-only Instances object
* @throws WekaException if a problem occurs
*/
@Override
public Instances outputStructureForConnectionType(String connectionName)
throws WekaException {
if (getStepManager().numIncomingConnections() > 0) {
for (Map.Entry> e : getStepManager()
.getIncomingConnections().entrySet()) {
// we assume (and check for at runtime) that all incoming
// batch connections have the same structure, so just taking
// the first connection here is sufficient to determine the
// output structure for any specified output connection type
String incomingConnType = e.getKey();
Instances incomingStruc =
getStepManager().getIncomingStructureFromStep(e.getValue().get(0),
incomingConnType);
return incomingStruc;
}
}
return null;
}
/**
* Main processing routine
*
* @param data incoming data object
* @throws WekaException if a problem occurs
*/
@Override
public void processIncoming(Data data) throws WekaException {
if (m_isReset) {
m_isReset = false;
if (getStepManager().numIncomingConnectionsOfType(
StepManager.CON_INSTANCE) > 0) {
m_streamingData = new Data(StepManager.CON_INSTANCE);
Instance inst = data.getPrimaryPayload();
m_incomingStructure = new Instances(inst.dataset(), 0);
} else {
m_incomingStructure = data.getPrimaryPayload();
m_incomingStructure = new Instances(m_incomingStructure, 0);
m_batchCount =
new AtomicInteger(getStepManager().numIncomingConnections());
getStepManager().processing();
}
m_root = new BracketNode();
m_root.parseFromInternal(m_expressionString);
m_root.init(m_incomingStructure, getStepManager()
.getExecutionEnvironment().getEnvironmentVariables());
}
if (m_streamingData == null) {
// processing batches
Instances batch = data.getPrimaryPayload();
if (!m_incomingStructure.equalHeaders(batch)) {
throw new WekaException("Incoming batches with different structure: "
+ m_incomingStructure.equalHeadersMsg(batch));
}
processBatch(data);
if (isStopRequested()) {
getStepManager().interrupted();
} else if (m_batchCount.get() == 0) {
getStepManager().finished();
}
} else {
// process streaming
processStreaming(data);
if (isStopRequested()) {
getStepManager().interrupted();
}
}
}
/**
* Handles streaming "instance" connections
*
* @param data incoming data object encapsulating an instance to process
* @throws WekaException if a problem occurs
*/
protected void processStreaming(Data data) throws WekaException {
if (getStepManager().isStreamFinished(data)) {
m_streamingData.clearPayload();
getStepManager().throughputFinished(m_streamingData);
return;
}
getStepManager().throughputUpdateStart();
Instance toProcess = data.getPrimaryPayload();
boolean result = m_root.evaluate(toProcess, true);
m_streamingData.setPayloadElement(StepManager.CON_INSTANCE, toProcess);
if (result) {
if (m_validTrueStep) {
getStepManager().outputData(StepManager.CON_INSTANCE,
m_customNameOfTrueStep, m_streamingData);
}
} else {
if (m_validFalseStep) {
getStepManager().outputData(StepManager.CON_INSTANCE,
m_customNameOfFalseStep, m_streamingData);
}
}
getStepManager().throughputUpdateEnd();
}
/**
* Processes batch data (dataset, training or test) connections.
*
* @param data the data object to process
* @throws WekaException if a problem occurs
*/
protected void processBatch(Data data) throws WekaException {
Instances incoming = data.getPrimaryPayload();
Instances trueBatch = new Instances(incoming, 0);
Instances falseBatch = new Instances(incoming, 0);
for (int i = 0; i < incoming.numInstances(); i++) {
if (isStopRequested()) {
return;
}
Instance current = incoming.instance(i);
boolean result = m_root.evaluate(current, true);
if (result) {
if (m_validTrueStep) {
trueBatch.add(current);
}
} else {
if (m_validFalseStep) {
falseBatch.add(current);
}
}
}
Integer setNum =
data.getPayloadElement(StepManager.CON_AUX_DATA_SET_NUM, 1);
Integer maxSetNum =
data.getPayloadElement(StepManager.CON_AUX_DATA_MAX_SET_NUM, 1);
if (m_validTrueStep) {
getStepManager().logDetailed(
"Routing " + trueBatch.numInstances() + " instances to step "
+ m_customNameOfTrueStep);
Data outputData = new Data(data.getConnectionName(), trueBatch);
outputData.setPayloadElement(StepManager.CON_AUX_DATA_SET_NUM, setNum);
outputData.setPayloadElement(StepManager.CON_AUX_DATA_MAX_SET_NUM,
maxSetNum);
getStepManager().outputData(data.getConnectionName(),
m_customNameOfTrueStep, outputData);
}
if (m_validFalseStep) {
getStepManager().logDetailed(
"Routing " + falseBatch.numInstances() + " instances to step "
+ m_customNameOfFalseStep);
Data outputData = new Data(data.getConnectionName(), falseBatch);
outputData.setPayloadElement(StepManager.CON_AUX_DATA_SET_NUM, setNum);
outputData.setPayloadElement(StepManager.CON_AUX_DATA_MAX_SET_NUM,
maxSetNum);
getStepManager().outputData(data.getConnectionName(),
m_customNameOfFalseStep, outputData);
}
if (setNum == maxSetNum) {
m_batchCount.decrementAndGet();
}
}
/**
* Return the fully qualified name of a custom editor component (JComponent)
* to use for editing the properties of the step. This method can return null,
* in which case the system will dynamically generate an editor using the
* GenericObjectEditor
*
* @return the fully qualified name of a step editor component
*/
@Override
public String getCustomEditorForStep() {
return "weka.gui.knowledgeflow.steps.FlowByExpressionStepEditorDialog";
}
/**
* Abstract base class for parts of a boolean expression.
*
* @author Mark Hall (mhall{[at]}pentaho{[dot]}com)
*/
public static abstract class ExpressionNode implements Serializable {
/** For serialization */
private static final long serialVersionUID = -8427857202322768762L;
/** boolean operator for combining with result so far */
protected boolean m_isAnOr;
/** is this node negated? */
protected boolean m_isNegated;
/** Environment variables */
protected transient Environment m_env;
/** Whether to show the combination operator in the textual representation */
protected boolean m_showAndOr = true;
/**
* Set whether this node is to be OR'ed to the result so far
*
* @param isOr true if this node is to be OR'd
*/
public void setIsOr(boolean isOr) {
m_isAnOr = isOr;
}
/**
* Get whether this node is to be OR'ed
*
* @return true if this node is to be OR'ed with the result so far
*/
public boolean isOr() {
return m_isAnOr;
}
/**
* Get whether this node is negated.
*
* @return
*/
public boolean isNegated() {
return m_isNegated;
}
/**
* Set whether this node is negated
*
* @param negated true if this node is negated
*/
public void setNegated(boolean negated) {
m_isNegated = negated;
}
/**
* Set whether to show the combination operator in the textual description
*
* @param show true if the combination operator is to be shown
*/
public void setShowAndOr(boolean show) {
m_showAndOr = show;
}
/**
* Initialize the node
*
* @param structure the structure of the incoming instances
* @param env Environment variables
*/
public void init(Instances structure, Environment env) {
m_env = env;
}
/**
* Evaluate this node and combine with the result so far
*
* @param inst the incoming instance to evalute with
* @param result the result to combine with
* @return the result after combining with this node
*/
public abstract boolean evaluate(Instance inst, boolean result);
/**
* Get the internal representation of this node
*
* @param buff the string buffer to append to
*/
public abstract void toStringInternal(StringBuffer buff);
/**
* Get the display representation of this node
*
* @param buff the string buffer to append to
*/
public abstract void toStringDisplay(StringBuffer buff);
/**
* Parse and initialize from the internal representation
*
* @param expression the expression to parse in internal representation
* @return the remaining parts of the expression after parsing and removing
* the part for this node
*/
protected abstract String parseFromInternal(String expression);
/**
* Get a DefaultMutableTreeNode for this node
*
* @param parent the parent of this node (if any)
* @return the DefaultMutableTreeNode for this node
*/
public abstract DefaultMutableTreeNode
toJTree(DefaultMutableTreeNode parent);
}
/**
* An expression node that encloses other expression nodes in brackets
*
* @author Mark Hall (mhall{[at]}pentaho{[dot]}com)
*/
public static class BracketNode extends ExpressionNode implements
Serializable {
/** For serialization */
private static final long serialVersionUID = 8732159083173001115L;
protected List m_children = new ArrayList();
@Override
public void init(Instances structure, Environment env) {
super.init(structure, env);
for (ExpressionNode n : m_children) {
n.init(structure, env);
}
}
@Override
public boolean evaluate(Instance inst, boolean result) {
boolean thisNode = true;
if (m_children.size() > 0) {
for (ExpressionNode n : m_children) {
thisNode = n.evaluate(inst, thisNode);
}
if (isNegated()) {
thisNode = !thisNode;
}
}
return (isOr() ? (result || thisNode) : (result && thisNode));
}
/**
* Add a child to this bracket node
*
* @param child the ExpressionNode to add
*/
public void addChild(ExpressionNode child) {
m_children.add(child);
if (m_children.size() > 0) {
m_children.get(0).setShowAndOr(false);
}
}
/**
* Remove a child from this bracket node
*
* @param child the ExpressionNode to remove
*/
public void removeChild(ExpressionNode child) {
m_children.remove(child);
if (m_children.size() > 0) {
m_children.get(0).setShowAndOr(false);
}
}
@Override
public String toString() {
// just the representation of this node (suitable for the abbreviated
// JTree node label
String result = "( )";
if (isNegated()) {
result = "!" + result;
}
if (m_showAndOr) {
if (m_isAnOr) {
result = "|| " + result;
} else {
result = "&& " + result;
}
}
return result;
}
@Override
public DefaultMutableTreeNode toJTree(DefaultMutableTreeNode parent) {
DefaultMutableTreeNode current = new DefaultMutableTreeNode(this);
if (parent != null) {
parent.add(current);
}
for (ExpressionNode child : m_children) {
child.toJTree(current);
}
return current;
}
private void toString(StringBuffer buff, boolean internal) {
if (m_children.size() >= 0) {
if (internal || m_showAndOr) {
if (m_isAnOr) {
buff.append("|| ");
} else {
buff.append("&& ");
}
}
if (isNegated()) {
buff.append("!");
}
buff.append("(");
int count = 0;
for (ExpressionNode child : m_children) {
if (internal) {
child.toStringInternal(buff);
} else {
child.toStringDisplay(buff);
}
count++;
if (count != m_children.size()) {
buff.append(" ");
}
}
buff.append(")");
}
}
@Override
public void toStringDisplay(StringBuffer buff) {
toString(buff, false);
}
@Override
public void toStringInternal(StringBuffer buff) {
toString(buff, true);
}
@Override
public String parseFromInternal(String expression) {
if (expression.startsWith("|| ")) {
m_isAnOr = true;
}
if (expression.startsWith("|| ") || expression.startsWith("&& ")) {
expression = expression.substring(3, expression.length());
}
if (expression.charAt(0) == '!') {
setNegated(true);
expression = expression.substring(1, expression.length());
}
if (expression.charAt(0) != '(') {
throw new IllegalArgumentException(
"Malformed expression! Was expecting a \"(\"");
}
expression = expression.substring(1, expression.length());
while (expression.charAt(0) != ')') {
int offset = 3;
if (expression.charAt(offset) == '(') {
ExpressionNode child = new BracketNode();
expression = child.parseFromInternal(expression);
m_children.add(child);
} else {
// must be an ExpressionClause
ExpressionNode child = new ExpressionClause();
expression = child.parseFromInternal(expression);
m_children.add(child);
}
}
if (m_children.size() > 0) {
m_children.get(0).setShowAndOr(false);
}
return expression;
}
}
/**
* An expression node that represents a clause of an expression
*
* @author Mark Hall (mhall{[at]}pentaho{[dot]}com)
*/
public static class ExpressionClause extends ExpressionNode implements
Serializable {
/** For serialization */
private static final long serialVersionUID = 2754006654981248325L;
/** The operator for this expression */
protected ExpressionType m_operator;
/** The name of the lhs attribute */
protected String m_lhsAttributeName;
/** The index of the lhs attribute */
protected int m_lhsAttIndex = -1;
/** The rhs operand (constant value or attribute name) */
protected String m_rhsOperand;
/** True if the rhs operand is an attribute */
protected boolean m_rhsIsAttribute;
/** index of the rhs if it is an attribute */
protected int m_rhsAttIndex = -1;
/** The name of the lhs attribute after resolving variables */
protected String m_resolvedLhsName;
/** The rhs operand after resolving variables */
protected String m_resolvedRhsOperand;
/** the compiled regex pattern (if the operator is REGEX) */
protected Pattern m_regexPattern;
/** The rhs operand (if constant and is a number ) */
protected double m_numericOperand;
public static enum ExpressionType {
EQUALS(" = ") {
@Override
boolean evaluate(Instance inst, int lhsAttIndex, String rhsOperand,
double numericOperand, Pattern regexPattern, boolean rhsIsAttribute,
int rhsAttIndex) {
if (rhsIsAttribute) {
if (inst.isMissing(lhsAttIndex) && inst.isMissing(rhsAttIndex)) {
return true;
}
if (inst.isMissing(lhsAttIndex) || inst.isMissing(rhsAttIndex)) {
return false;
}
return (inst.value(lhsAttIndex) == inst.value(rhsAttIndex));
}
if (inst.isMissing(lhsAttIndex)) {
return false;
}
return (inst.value(lhsAttIndex) == numericOperand);
}
},
NOTEQUAL(" != ") {
@Override
boolean evaluate(Instance inst, int lhsAttIndex, String rhsOperand,
double numericOperand, Pattern regexPattern, boolean rhsIsAttribute,
int rhsAttIndex) {
return !EQUALS.evaluate(inst, lhsAttIndex, rhsOperand,
numericOperand, regexPattern, rhsIsAttribute, rhsAttIndex);
}
},
LESSTHAN(" < ") {
@Override
boolean evaluate(Instance inst, int lhsAttIndex, String rhsOperand,
double numericOperand, Pattern regexPattern, boolean rhsIsAttribute,
int rhsAttIndex) {
if (rhsIsAttribute) {
if (inst.isMissing(lhsAttIndex) || inst.isMissing(rhsAttIndex)) {
return false;
}
return (inst.value(lhsAttIndex) < inst.value(rhsAttIndex));
}
if (inst.isMissing(lhsAttIndex)) {
return false;
}
return (inst.value(lhsAttIndex) < numericOperand);
}
},
LESSTHANEQUAL(" <= ") {
@Override
boolean evaluate(Instance inst, int lhsAttIndex, String rhsOperand,
double numericOperand, Pattern regexPattern, boolean rhsIsAttribute,
int rhsAttIndex) {
if (rhsIsAttribute) {
if (inst.isMissing(lhsAttIndex) || inst.isMissing(rhsAttIndex)) {
return false;
}
return (inst.value(lhsAttIndex) <= inst.value(rhsAttIndex));
}
if (inst.isMissing(lhsAttIndex)) {
return false;
}
return (inst.value(lhsAttIndex) <= numericOperand);
}
},
GREATERTHAN(" > ") {
@Override
boolean evaluate(Instance inst, int lhsAttIndex, String rhsOperand,
double numericOperand, Pattern regexPattern, boolean rhsIsAttribute,
int rhsAttIndex) {
return !LESSTHANEQUAL.evaluate(inst, lhsAttIndex, rhsOperand,
numericOperand, regexPattern, rhsIsAttribute, rhsAttIndex);
}
},
GREATERTHANEQUAL(" >= ") {
@Override
boolean evaluate(Instance inst, int lhsAttIndex, String rhsOperand,
double numericOperand, Pattern regexPattern, boolean rhsIsAttribute,
int rhsAttIndex) {
return !LESSTHAN.evaluate(inst, lhsAttIndex, rhsOperand,
numericOperand, regexPattern, rhsIsAttribute, rhsAttIndex);
}
},
ISMISSING(" isMissing ") {
@Override
boolean evaluate(Instance inst, int lhsAttIndex, String rhsOperand,
double numericOperand, Pattern regexPattern, boolean rhsIsAttribute,
int rhsAttIndex) {
return (inst.isMissing(lhsAttIndex));
}
},
CONTAINS(" contains ") {
@Override
boolean evaluate(Instance inst, int lhsAttIndex, String rhsOperand,
double numericOperand, Pattern regexPattern, boolean rhsIsAttribute,
int rhsAttIndex) {
if (inst.isMissing(lhsAttIndex)) {
return false;
}
String lhsString = "";
try {
lhsString = inst.stringValue(lhsAttIndex);
} catch (IllegalArgumentException ex) {
return false;
}
if (rhsIsAttribute) {
if (inst.isMissing(rhsAttIndex)) {
return false;
}
try {
String rhsString = inst.stringValue(rhsAttIndex);
return lhsString.contains(rhsString);
} catch (IllegalArgumentException ex) {
return false;
}
}
return lhsString.contains(rhsOperand);
}
},
STARTSWITH(" startsWith ") {
@Override
boolean evaluate(Instance inst, int lhsAttIndex, String rhsOperand,
double numericOperand, Pattern regexPattern, boolean rhsIsAttribute,
int rhsAttIndex) {
if (inst.isMissing(lhsAttIndex)) {
return false;
}
String lhsString = "";
try {
lhsString = inst.stringValue(lhsAttIndex);
} catch (IllegalArgumentException ex) {
return false;
}
if (rhsIsAttribute) {
if (inst.isMissing(rhsAttIndex)) {
return false;
}
try {
String rhsString = inst.stringValue(rhsAttIndex);
return lhsString.startsWith(rhsString);
} catch (IllegalArgumentException ex) {
return false;
}
}
return lhsString.startsWith(rhsOperand);
}
},
ENDSWITH(" endsWith ") {
@Override
boolean evaluate(Instance inst, int lhsAttIndex, String rhsOperand,
double numericOperand, Pattern regexPattern, boolean rhsIsAttribute,
int rhsAttIndex) {
if (inst.isMissing(lhsAttIndex)) {
return false;
}
String lhsString = "";
try {
lhsString = inst.stringValue(lhsAttIndex);
} catch (IllegalArgumentException ex) {
return false;
}
if (rhsIsAttribute) {
if (inst.isMissing(rhsAttIndex)) {
return false;
}
try {
String rhsString = inst.stringValue(rhsAttIndex);
return lhsString.endsWith(rhsString);
} catch (IllegalArgumentException ex) {
return false;
}
}
return lhsString.endsWith(rhsOperand);
}
},
REGEX(" regex ") {
@Override
boolean evaluate(Instance inst, int lhsAttIndex, String rhsOperand,
double numericOperand, Pattern regexPattern, boolean rhsIsAttribute,
int rhsAttIndex) {
if (inst.isMissing(lhsAttIndex)) {
return false;
}
if (regexPattern == null) {
return false;
}
String lhsString = "";
try {
lhsString = inst.stringValue(lhsAttIndex);
} catch (IllegalArgumentException ex) {
return false;
}
return regexPattern.matcher(lhsString).matches();
}
};
abstract boolean evaluate(Instance inst, int lhsAttIndex,
String rhsOperand, double numericOperand, Pattern regexPattern,
boolean rhsIsAttribute, int rhsAttIndex);
private final String m_stringVal;
ExpressionType(String name) {
m_stringVal = name;
}
@Override
public String toString() {
return m_stringVal;
}
}
public ExpressionClause() {
}
/**
* Construct a new ExpressionClause
*
* @param operator the operator to use
* @param lhsAttributeName the lhs attribute name
* @param rhsOperand the rhs operand
* @param rhsIsAttribute true if the rhs operand is an attribute
* @param isAnOr true if the result of this expression is to be OR'ed with
* the result so far
*/
public ExpressionClause(ExpressionType operator, String lhsAttributeName,
String rhsOperand, boolean rhsIsAttribute, boolean isAnOr) {
m_operator = operator;
m_lhsAttributeName = lhsAttributeName;
m_rhsOperand = rhsOperand;
m_rhsIsAttribute = rhsIsAttribute;
m_isAnOr = isAnOr;
}
/**
* Get the lhs attribute name
*
* @return the lhs attribute name
*/
public String getLHSAttName() {
return m_lhsAttributeName;
}
/**
* Set the lhs attribute name
*
* @param attName the lhs att naem
*/
public void setLHSAttName(String attName) {
m_lhsAttributeName = attName;
}
/**
* Get the rhs operand
*
* @return the rhs operando
*/
public String getRHSOperand() {
return m_rhsOperand;
}
/**
* Set the rhs operand
*
* @param opp the rhs operand to set
*/
public void setRHSOperand(String opp) {
m_rhsOperand = opp;
}
/**
* Returns true if the RHS is an attribute rather than a constant
*
* @return true if the RHS is an attribute
*/
public boolean isRHSAnAttribute() {
return m_rhsIsAttribute;
}
/**
* Set whether the RHS is an attribute rather than a constant
*
* @param rhs true if the RHS is an attribute rather than a constant
*/
public void setRHSIsAnAttribute(boolean rhs) {
m_rhsIsAttribute = rhs;
}
/**
* Get the operator
*
* @return the operator
*/
public ExpressionType getOperator() {
return m_operator;
}
/**
* Set the operator
*
* @param opp the operator to use
*/
public void setOperator(ExpressionType opp) {
m_operator = opp;
}
@Override
public void init(Instances structure, Environment env) {
super.init(structure, env);
m_resolvedLhsName = m_lhsAttributeName;
m_resolvedRhsOperand = m_rhsOperand;
try {
m_resolvedLhsName = m_env.substitute(m_resolvedLhsName);
m_resolvedRhsOperand = m_env.substitute(m_resolvedRhsOperand);
} catch (Exception ex) {
}
Attribute lhs = null;
// try as an index or "special" label first
if (m_resolvedLhsName.toLowerCase().startsWith("/first")) {
lhs = structure.attribute(0);
} else if (m_resolvedLhsName.toLowerCase().startsWith("/last")) {
lhs = structure.attribute(structure.numAttributes() - 1);
} else {
// try as an index
try {
int indx = Integer.parseInt(m_resolvedLhsName);
indx--;
lhs = structure.attribute(indx);
} catch (NumberFormatException ex) {
// ignore
}
}
if (lhs == null) {
lhs = structure.attribute(m_resolvedLhsName);
}
if (lhs == null) {
throw new IllegalArgumentException("Data does not contain attribute "
+ "\"" + m_resolvedLhsName + "\"");
}
m_lhsAttIndex = lhs.index();
if (m_rhsIsAttribute) {
Attribute rhs = null;
// try as an index or "special" label first
if (m_resolvedRhsOperand.toLowerCase().equals("/first")) {
rhs = structure.attribute(0);
} else if (m_resolvedRhsOperand.toLowerCase().equals("/last")) {
rhs = structure.attribute(structure.numAttributes() - 1);
} else {
// try as an index
try {
int indx = Integer.parseInt(m_resolvedRhsOperand);
indx--;
rhs = structure.attribute(indx);
} catch (NumberFormatException ex) {
// ignore
}
}
if (rhs == null) {
rhs = structure.attribute(m_resolvedRhsOperand);
}
if (rhs == null) {
throw new IllegalArgumentException("Data does not contain attribute "
+ "\"" + m_resolvedRhsOperand + "\"");
}
m_rhsAttIndex = rhs.index();
} else if (m_operator != ExpressionType.CONTAINS
&& m_operator != ExpressionType.STARTSWITH
&& m_operator != ExpressionType.ENDSWITH
&& m_operator != ExpressionType.REGEX
&& m_operator != ExpressionType.ISMISSING) {
// make sure the operand is parseable as a number (unless missing has
// been specified - equals only)
if (lhs.isNominal()) {
m_numericOperand = lhs.indexOfValue(m_resolvedRhsOperand);
if (m_numericOperand < 0) {
throw new IllegalArgumentException("Unknown nominal value '"
+ m_resolvedRhsOperand + "' for attribute '" + lhs.name() + "'");
}
} else {
try {
m_numericOperand = Double.parseDouble(m_resolvedRhsOperand);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("\"" + m_resolvedRhsOperand
+ "\" is not parseable as a number!");
}
}
}
if (m_operator == ExpressionType.REGEX) {
m_regexPattern = Pattern.compile(m_resolvedRhsOperand);
}
}
@Override
public boolean evaluate(Instance inst, boolean result) {
boolean thisNode =
m_operator.evaluate(inst, m_lhsAttIndex, m_rhsOperand,
m_numericOperand, m_regexPattern, m_rhsIsAttribute, m_rhsAttIndex);
if (isNegated()) {
thisNode = !thisNode;
}
return (isOr() ? (result || thisNode) : (result && thisNode));
}
@Override
public String toString() {
StringBuffer buff = new StringBuffer();
toStringDisplay(buff);
return buff.toString();
}
@Override
public void toStringDisplay(StringBuffer buff) {
toString(buff, false);
}
@Override
public void toStringInternal(StringBuffer buff) {
toString(buff, true);
}
@Override
public DefaultMutableTreeNode toJTree(DefaultMutableTreeNode parent) {
parent.add(new DefaultMutableTreeNode(this));
return parent;
}
private void toString(StringBuffer buff, boolean internal) {
if (internal || m_showAndOr) {
if (m_isAnOr) {
buff.append("|| ");
} else {
buff.append("&& ");
}
}
if (isNegated()) {
buff.append("!");
}
buff.append("[");
buff.append(m_lhsAttributeName);
if (internal) {
buff.append("@EC@" + m_operator.toString());
} else {
buff.append(" " + m_operator.toString());
}
if (m_operator != ExpressionType.ISMISSING) {
// @@ indicates that the rhs is an attribute
if (internal) {
buff.append("@EC@" + (m_rhsIsAttribute ? "@@" : "") + m_rhsOperand);
} else {
buff.append(" " + (m_rhsIsAttribute ? "ATT: " : "") + m_rhsOperand);
}
} else {
if (internal) {
buff.append("@EC@");
} else {
buff.append(" ");
}
}
buff.append("]");
}
@Override
protected String parseFromInternal(String expression) {
// first the boolean operator for this clause
if (expression.startsWith("|| ")) {
m_isAnOr = true;
}
if (expression.startsWith("|| ") || expression.startsWith("&& ")) {
// strip the boolean operator
expression = expression.substring(3, expression.length());
}
if (expression.charAt(0) == '!') {
setNegated(true);
expression = expression.substring(1, expression.length());
}
if (expression.charAt(0) != '[') {
throw new IllegalArgumentException(
"Was expecting a \"[\" to start this ExpressionClause!");
}
expression = expression.substring(1, expression.length());
m_lhsAttributeName = expression.substring(0, expression.indexOf("@EC@"));
expression =
expression.substring(expression.indexOf("@EC@") + 4,
expression.length());
String oppName = expression.substring(0, expression.indexOf("@EC@"));
expression =
expression.substring(expression.indexOf("@EC@") + 4,
expression.length());
for (ExpressionType n : ExpressionType.values()) {
if (n.toString().equals(oppName)) {
m_operator = n;
break;
}
}
if (expression.startsWith("@@")) {
// rhs is an attribute
expression = expression.substring(2, expression.length()); // strip off
// "@@"
m_rhsIsAttribute = true;
}
m_rhsOperand = expression.substring(0, expression.indexOf(']'));
expression =
expression.substring(expression.indexOf(']') + 1, expression.length()); // remove
// "]"
if (expression.charAt(0) == ' ') {
expression = expression.substring(1, expression.length());
}
return expression;
}
}
}
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