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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_matchRules;
/** The input structure */
protected Instances m_inputStructure;
/** The output structure */
protected Instances m_outputStructure;
/** An optional prefix for status log messages */
protected String m_statusMessagePrefix = "";
@Override
public void setEnvironment(Environment env) {
m_env = env;
}
/**
* Constructor
*
* @param matchDetails the internally encoded match details string
* @param inputStructure the incoming instances structure
* @param statusMessagePrefix an optional status message prefix string for
* logging
* @param log the log to use (may be null)
* @param env environment variables
*/
public SubstringReplacerRules(String matchDetails, Instances inputStructure,
String statusMessagePrefix, Logger log, Environment env) {
m_matchRules =
matchRulesFromInternal(matchDetails, inputStructure, statusMessagePrefix,
log, env);
m_inputStructure = new Instances(inputStructure);
m_outputStructure = new Instances(inputStructure).stringFreeStructure();
m_env = env;
m_statusMessagePrefix = statusMessagePrefix;
}
/**
* Constructor. Initializes with system-wide environment variables and uses no
* status message and no log.
*
* @param matchDetails the internally encoded match details string
* @param inputStructure the incoming instances structure
*/
public SubstringReplacerRules(String matchDetails, Instances inputStructure) {
this(matchDetails, inputStructure, "", null, Environment.getSystemWide());
}
/**
* Get a list of match rules from an internally encoded match specification
*
* @param matchReplaceDetails the internally encoded specification of the
* match rules
* @param inputStructure the input instances structure
* @param statusMessagePrefix an optional status message prefix for logging
* @param log the log to use
* @param env environment variables
* @return a list of match rules
*/
public static List matchRulesFromInternal(
String matchReplaceDetails, Instances inputStructure,
String statusMessagePrefix, Logger log, Environment env) {
List matchRules =
new ArrayList();
String[] mrParts = matchReplaceDetails.split("@@match-replace@@");
for (String p : mrParts) {
SubstringReplacerMatchRule mr = new SubstringReplacerMatchRule(p.trim());
mr.m_statusMessagePrefix = statusMessagePrefix;
mr.m_logger = log;
mr.init(env, inputStructure);
matchRules.add(mr);
}
return matchRules;
}
public void applyRules(Instance inst) {
for (SubstringReplacerMatchRule mr : m_matchRules) {
mr.apply(inst);
}
}
/**
* Make an output instance given an input one
*
* @param inputI the input instance to process
* @return the output instance with substrings replaced
*/
public Instance makeOutputInstance(Instance inputI) {
double[] vals = new double[m_outputStructure.numAttributes()];
String[] stringVals = new String[m_outputStructure.numAttributes()];
for (int i = 0; i < inputI.numAttributes(); i++) {
if (inputI.attribute(i).isString() && !inputI.isMissing(i)) {
stringVals[i] = inputI.stringValue(i);
} else {
vals[i] = inputI.value(i);
}
}
for (SubstringReplacerMatchRule mr : m_matchRules) {
mr.apply(stringVals);
}
for (int i = 0; i < m_outputStructure.numAttributes(); i++) {
if (m_outputStructure.attribute(i).isString() && stringVals[i] != null) {
m_outputStructure.attribute(i).setStringValue(stringVals[i]);
}
}
Instance result = new DenseInstance(inputI.weight(), vals);
result.setDataset(m_outputStructure);
return result;
}
/**
* Inner class encapsulating the logic for matching and replacing.
*
* @author Mark Hall (mhall{[at]}pentaho{[dot]}com)
*/
public static class SubstringReplacerMatchRule implements Serializable {
private static final long serialVersionUID = 5792838913737819728L;
/** The substring literal/regex to use for matching */
protected String m_match = "";
/** The string to replace with */
protected String m_replace = "";
/** True if a regular expression match is to be used */
protected boolean m_regex;
/** Precompiled regex */
protected Pattern m_regexPattern;
/** True if case should be ignored when matching */
protected boolean m_ignoreCase;
/** The attributes to apply the match-replace rule to */
protected String m_attsToApplyTo = "";
protected String m_matchS;
protected String m_replaceS;
protected int[] m_selectedAtts;
protected String m_statusMessagePrefix;
protected Logger m_logger;
/**
* Constructor
*/
public SubstringReplacerMatchRule() {
}
/**
* Constructor
*
* @param setup an internally encoded representation of all the match and
* replace information for this rule
*/
public SubstringReplacerMatchRule(String setup) {
parseFromInternal(setup);
}
/**
* Constructor
*
* @param match the match string
* @param replace the replace string
* @param regex true if this is a regular expression match
* @param ignoreCase true if case is to be ignored
* @param selectedAtts the attributes to apply the rule to
*/
public SubstringReplacerMatchRule(String match, String replace,
boolean regex, boolean ignoreCase, String selectedAtts) {
m_match = match;
m_replace = replace;
m_regex = regex;
m_ignoreCase = ignoreCase;
m_attsToApplyTo = selectedAtts;
}
protected void parseFromInternal(String setup) {
String[] parts = setup.split("@@MR@@");
if (parts.length < 4 || parts.length > 5) {
throw new IllegalArgumentException(
"Malformed match-replace definition: " + setup);
}
m_attsToApplyTo = parts[0].trim();
m_regex = parts[1].trim().toLowerCase().equals("t");
m_ignoreCase = parts[2].trim().toLowerCase().equals("t");
m_match = parts[3].trim();
if (m_match == null || m_match.length() == 0) {
throw new IllegalArgumentException("Must provide something to match!");
}
if (parts.length == 5) {
m_replace = parts[4];
}
}
/**
* Set the string/regex to use for matching
*
* @param match the match string
*/
public void setMatch(String match) {
m_match = match;
}
/**
* Get the string/regex to use for matching
*
* @return the match string
*/
public String getMatch() {
return m_match;
}
/**
* Set the replace string
*
* @param replace the replace string
*/
public void setReplace(String replace) {
m_replace = replace;
}
/**
* Get the replace string
*
* @return the replace string
*/
public String getReplace() {
return m_replace;
}
/**
* Set whether this is a regular expression match or not
*
* @param regex true if this is a regular expression match
*/
public void setRegex(boolean regex) {
m_regex = regex;
}
/**
* Get whether this is a regular expression match or not
*
* @return true if this is a regular expression match
*/
public boolean getRegex() {
return m_regex;
}
/**
* Set whether to ignore case when matching
*
* @param ignore true if case is to be ignored
*/
public void setIgnoreCase(boolean ignore) {
m_ignoreCase = ignore;
}
/**
* Get whether to ignore case when matching
*
* @return true if case is to be ignored
*/
public boolean getIgnoreCase() {
return m_ignoreCase;
}
/**
* Set the attributes to apply the rule to
*
* @param a the attributes to apply the rule to.
*/
public void setAttsToApplyTo(String a) {
m_attsToApplyTo = a;
}
/**
* Get the attributes to apply the rule to
*
* @return the attributes to apply the rule to.
*/
public String getAttsToApplyTo() {
return m_attsToApplyTo;
}
/**
* Initialize this match replace rule by substituting any environment
* variables in the attributes, match and replace strings. Sets up the
* attribute indices to apply to and validates that the selected attributes
* are all String attributes
*
* @param env the environment variables
* @param structure the structure of the incoming instances
*/
public void init(Environment env, Instances structure) {
m_matchS = m_match;
m_replaceS = m_replace;
String attsToApplyToS = m_attsToApplyTo;
try {
m_matchS = env.substitute(m_matchS);
m_replaceS = env.substitute(m_replace);
attsToApplyToS = env.substitute(attsToApplyToS);
} catch (Exception ex) {
}
if (m_regex) {
String match = m_matchS;
if (m_ignoreCase) {
match = match.toLowerCase();
}
// precompile regular expression for speed
m_regexPattern = Pattern.compile(match);
}
// Try a range first for the attributes
String tempRangeS = attsToApplyToS;
tempRangeS =
tempRangeS.replace("/first", "first").replace("/last", "last");
Range tempR = new Range();
tempR.setRanges(attsToApplyToS);
try {
tempR.setUpper(structure.numAttributes() - 1);
m_selectedAtts = tempR.getSelection();
} catch (IllegalArgumentException ex) {
// probably contains attribute names then
m_selectedAtts = null;
}
if (m_selectedAtts == null) {
// parse the comma separated list of attribute names
Set indexes = new HashSet();
String[] attParts = m_attsToApplyTo.split(",");
for (String att : attParts) {
att = att.trim();
if (att.toLowerCase().equals("/first")) {
indexes.add(0);
} else if (att.toLowerCase().equals("/last")) {
indexes.add((structure.numAttributes() - 1));
} else {
// try and find attribute
if (structure.attribute(att) != null) {
indexes.add(new Integer(structure.attribute(att).index()));
} else {
if (m_logger != null) {
String msg =
m_statusMessagePrefix + "Can't find attribute '" + att
+ "in the incoming instances - ignoring";
m_logger.logMessage(msg);
}
}
}
}
m_selectedAtts = new int[indexes.size()];
int c = 0;
for (Integer i : indexes) {
m_selectedAtts[c++] = i.intValue();
}
}
// validate the types of the selected atts
Set indexes = new HashSet();
for (int m_selectedAtt : m_selectedAtts) {
if (structure.attribute(m_selectedAtt).isString()) {
indexes.add(m_selectedAtt);
} else {
if (m_logger != null) {
String msg =
m_statusMessagePrefix + "Attribute '"
+ structure.attribute(m_selectedAtt).name()
+ "is not a string attribute - " + "ignoring";
m_logger.logMessage(msg);
}
}
}
// final array
m_selectedAtts = new int[indexes.size()];
int c = 0;
for (Integer i : indexes) {
m_selectedAtts[c++] = i.intValue();
}
}
/**
* Apply this rule to the supplied instance
*
* @param inst the instance to apply to
*/
public void apply(Instance inst) {
for (int i = 0; i < m_selectedAtts.length; i++) {
int numStringVals = inst.attribute(m_selectedAtts[i]).numValues();
if (!inst.isMissing(m_selectedAtts[i])) {
String value = inst.stringValue(m_selectedAtts[i]);
value = apply(value);
inst.dataset().attribute(m_selectedAtts[i]).setStringValue(value);
// only set the index to zero if there were more than 1 string values
// for this string attribute (meaning that although the data is
// streaming
// in, the user has opted to retain all string values in the header.
// We
// only operate in pure streaming - one string value in memory at any
// one time - mode).
// this check saves time (no new attribute vector created) if there is
// only one value (i.e. index is already zero).
if (numStringVals > 1) {
inst.setValue(m_selectedAtts[i], 0);
}
}
}
}
/**
* Apply this rule to the supplied array of strings. This array is expected
* to contain string values from an instance at the same index that they
* occur in the original instance. Null elements indicate non-string or
* missing values from the original instance
*
* @param stringVals an array of strings containing string values from an
* input instance
*/
public void apply(String[] stringVals) {
for (int i = 0; i < m_selectedAtts.length; i++) {
if (stringVals[m_selectedAtts[i]] != null) {
stringVals[m_selectedAtts[i]] = apply(stringVals[m_selectedAtts[i]]);
}
}
}
/**
* Apply this rule to the supplied string
*
* @param source the string to apply to
* @return the source string with any matching substrings replaced.
*/
protected String apply(String source) {
String result = source;
String match = m_matchS;
if (m_ignoreCase) {
result = result.toLowerCase();
match = match.toLowerCase();
}
if (result != null && result.length() > 0) {
if (m_regex) {
// result = result.replaceAll(match, m_replaceS);
result = m_regexPattern.matcher(result).replaceAll(m_replaceS);
} else {
result = result.replace(match, m_replaceS);
}
}
return result;
}
/**
* Return a textual description of this rule
*
* @return textual description of this rule
*/
@Override
public String toString() {
// return a nicely formatted string for display
// that shows all the details
StringBuffer buff = new StringBuffer();
buff.append((m_regex) ? "Regex: " : "Substring: ");
buff.append(m_match).append(" --> ").append(m_replace).append(" ");
buff.append((m_ignoreCase) ? "[ignore case]" : "").append(" ");
buff.append("[Atts: " + m_attsToApplyTo + "]");
return buff.toString();
}
/**
* Return the internally encoded representation of this rule
*
* @return the internally (parseable) representation of this rule
*/
public String toStringInternal() {
// return a string in internal format that is
// easy to parse all the data out of
StringBuffer buff = new StringBuffer();
buff.append(m_attsToApplyTo).append("@@MR@@");
buff.append((m_regex) ? "t" : "f").append("@@MR@@");
buff.append((m_ignoreCase) ? "t" : "f").append("@@MR@@");
buff.append(m_match).append("@@MR@@");
buff.append(m_replace);
return buff.toString();
}
}
}
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