/*
* Encog(tm) Core v3.4 - Java Version
* http://www.heatonresearch.com/encog/
* https://github.com/encog/encog-java-core
* Copyright 2008-2016 Heaton Research, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* For more information on Heaton Research copyrights, licenses
* and trademarks visit:
* http://www.heatonresearch.com/copyright
*/
package org.encog.app.analyst.csv.basic;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import org.encog.Encog;
import org.encog.NullStatusReportable;
import org.encog.StatusReportable;
import org.encog.app.analyst.script.AnalystScript;
import org.encog.app.analyst.script.DataField;
import org.encog.app.quant.QuantError;
import org.encog.app.quant.QuantTask;
import org.encog.util.csv.CSVFormat;
import org.encog.util.csv.ReadCSV;
/**
* Many of the Encog quant CSV processors are based upon this class. This class
* is not useful on its own. However, it does form the foundation for most Encog
* CSV file processing.
*/
public class BasicFile implements QuantTask {
/**
* The default report interval.
*/
public static final int REPORT_INTERVAL = 10000;
/**
* Append a separator. The separator will only be appended if the line is
* not empty. This is used to build comma(or other) separated lists.
*
* @param line
* The line to append to.
* @param format
* The format to use.
*/
public static void appendSeparator(final StringBuilder line,
final CSVFormat format) {
if ((line.length() > 0)
&& !line.toString().endsWith(format.getSeparator() + "")) {
line.append(format.getSeparator());
}
}
/**
* The column headings from the input file.
*/
private String[] inputHeadings;
/**
* The desired precision when numbers must be written. Defaults to 10
* decimal places.
*/
private int precision;
/**
* Most Encog CSV classes must analyze a CSV file before actually processing
* it. This property specifies if the file has been analyzed yet.
*/
private boolean analyzed;
/**
* The input filename. This is the file being analyzed/processed.
*/
private File inputFilename;
/**
* True, if input headers should be expected.
*/
private boolean expectInputHeaders;
/**
* The format of the input file.
*/
private CSVFormat format;
/**
* The number of columns in the input file.
*/
private int columnCount;
/**
* Allows status to be reported. Defaults to no status reported.
*/
private StatusReportable report;
/**
* The number of records to process before status is updated. Defaults to
* 10k.
*/
private int reportInterval;
/**
* The number of records to process. This is determined when the file is
* analyzed.
*/
private int recordCount;
/**
* The last time status was updated.
*/
private int lastUpdate;
/**
* The current record.
*/
private int currentRecord;
/**
* Should output headers be produced?
*/
private boolean produceOutputHeaders;
/**
* True, if the process should stop.
*/
private boolean cancel;
/**
* The Encog script to use.
*/
private AnalystScript script;
/**
* Construct the object, and set the defaults.
*/
public BasicFile() {
this.precision = Encog.DEFAULT_PRECISION;
this.report = new NullStatusReportable();
this.reportInterval = REPORT_INTERVAL;
this.produceOutputHeaders = true;
resetStatus();
}
/**
* @return The column count.
*/
public int getColumnCount() {
return this.columnCount;
}
/**
* @return The input filename.
*/
public File getInputFilename() {
return this.inputFilename;
}
/**
* @return THe input format.
*/
public CSVFormat getFormat() {
return this.format;
}
/**
* @return The input headings.
*/
public String[] getInputHeadings() {
return this.inputHeadings;
}
/**
* @return The precision to use.
*/
public int getPrecision() {
return this.precision;
}
/**
* @return Get the record count. File must have been analyzed first to read
* the record count.
*/
public int getRecordCount() {
if (!this.analyzed) {
throw new QuantError("Must analyze file first.");
}
return this.recordCount;
}
/**
* @return The status reporting object.
*/
public StatusReportable getReport() {
return this.report;
}
/**
* @return The reporting interval, an update will be sent for every block of
* rows that matches the size of this property.
*/
public int getReportInterval() {
return this.reportInterval;
}
/**
* @return Has the file been analyzed.
*/
public boolean isAnalyzed() {
return this.analyzed;
}
/**
* @return True if we are expecting input headers.
*/
public boolean isExpectInputHeaders() {
return this.expectInputHeaders;
}
/**
* @return the produceOutputHeaders
*/
public boolean isProduceOutputHeaders() {
return this.produceOutputHeaders;
}
/**
* Perform a basic analyze of the file. This method is used mostly
* internally.
*/
public void performBasicCounts() {
resetStatus();
int rc = 0;
final ReadCSV csv = new ReadCSV(this.inputFilename.toString(),
this.expectInputHeaders, this.format);
while (csv.next() && !this.cancel) {
updateStatus(true);
rc++;
}
this.recordCount = rc;
this.columnCount = csv.getColumnCount();
readHeaders(csv);
csv.close();
reportDone(true);
}
/**
* Prepare the output file, write headers if needed.
*
* @param outputFile
* The name of the output file.
* @return The output stream for the text file.
*/
public PrintWriter prepareOutputFile(final File outputFile) {
try {
final PrintWriter tw = new PrintWriter(new FileWriter(outputFile));
// write headers, if needed
if (this.produceOutputHeaders) {
int index = 0;
final StringBuilder line = new StringBuilder();
if (this.inputHeadings != null) {
for (final String str : this.inputHeadings) {
if (line.length() > 0) {
line.append(this.format.getSeparator());
}
line.append("\"");
line.append(str);
line.append("\"");
index++;
}
} else {
for (int i = 0; i < this.columnCount; i++) {
line.append("\"field:");
line.append(i + 1);
line.append("\"");
}
}
tw.println(line.toString());
}
return tw;
} catch (final IOException e) {
throw new QuantError(e);
}
}
/**
* Read the headers from a CSV file. Used mostly internally.
*
* @param csv
* The CSV file to read from.
*/
public void readHeaders(final ReadCSV csv) {
if (this.expectInputHeaders) {
this.inputHeadings = new String[csv.getColumnNames().size()];
for (int i = 0; i < csv.getColumnNames().size(); i++) {
this.inputHeadings[i] = csv.getColumnNames().get(i);
}
} else {
this.inputHeadings = new String[csv.getColumnCount()];
int i = 0;
if (this.getScript() != null) {
for (DataField field : this.getScript().getFields()) {
this.inputHeadings[i++] = field.getName();
}
}
while (i < csv.getColumnCount()) {
this.inputHeadings[i] = "field:" + i;
i++;
}
}
}
/**
* Report that we are done. Used internally.
*
* @param isAnalyzing
* True if we are analyzing.
*/
public void reportDone(final boolean isAnalyzing) {
if (isAnalyzing) {
this.report.report(this.recordCount, this.recordCount,
"Done analyzing");
} else {
this.report.report(this.recordCount, this.recordCount,
"Done processing");
}
}
/**
* Report that we are done. Used internally.
*
* @param task
* The message.
*/
public void reportDone(final String task) {
this.report.report(this.recordCount, this.recordCount, task);
}
/**
* Request a stop.
*/
@Override
public void requestStop() {
this.cancel = true;
}
/**
* Reset the reporting stats. Used internally.
*/
public void resetStatus() {
this.lastUpdate = 0;
this.currentRecord = 0;
}
/**
* Set to true, if the file has been analyzed.
*
* @param theAnalyzed
* True, if the file has been analyzed.
*/
public void setAnalyzed(final boolean theAnalyzed) {
this.analyzed = theAnalyzed;
}
/**
* Set the column count.
*
* @param theColumnCount
* The new column count.
*/
public void setColumnCount(final int theColumnCount) {
this.columnCount = theColumnCount;
}
/**
* Set the flag to determine if we are expecting input headers.
*
* @param theExpectInputHeaders Are input headers expected?
*/
public void setExpectInputHeaders(
final boolean theExpectInputHeaders) {
this.expectInputHeaders = theExpectInputHeaders;
}
/**
* Set the input filename.
*
* @param theInputFilename
* The input filename.
*/
public void setInputFilename(final File theInputFilename) {
this.inputFilename = theInputFilename;
}
/**
* Set the input format.
*
* @param theInputFormat
* The new inputFormat format.
*/
public void setInputFormat(final CSVFormat theInputFormat) {
this.format = theInputFormat;
}
/**
* Set the input headings.
*
* @param theInputHeadings
* The new input headings.
*/
public void setInputHeadings(final String[] theInputHeadings) {
this.inputHeadings = theInputHeadings;
}
/**
* Set the precision to use.
*
* @param thePrecision
* The precision to use.
*/
public void setPrecision(final int thePrecision) {
this.precision = thePrecision;
}
/**
* @param theProduceOutputHeaders
* the produceOutputHeaders to set
*/
public void setProduceOutputHeaders(
final boolean theProduceOutputHeaders) {
this.produceOutputHeaders = theProduceOutputHeaders;
}
/**
* Set the record count.
*
* @param v
* The record count.
*/
public void setRecordCount(final int v) {
this.recordCount = v;
}
/**
* Set the status reporting object.
*
* @param theReport
* The status reporting object.
*/
public void setReport(final StatusReportable theReport) {
this.report = theReport;
}
/**
* Set the reporting interval.
*
* @param theReportInterval
* The new reporting interval.
*/
public void setReportInterval(final int theReportInterval) {
this.reportInterval = theReportInterval;
}
/**
* @return Should we stop?
*/
@Override
public boolean shouldStop() {
return this.cancel;
}
/** {@inheritDoc} */
@Override
public String toString() {
final StringBuilder result = new StringBuilder("[");
result.append(getClass().getSimpleName());
result.append(" inputFilename=");
result.append(this.inputFilename);
result.append(", recordCount=");
result.append(this.recordCount);
result.append("]");
return result.toString();
}
/**
* Update the status. Used internally.
*
* @param isAnalyzing
* True if we are in the process of analyzing.
*/
public void updateStatus(final boolean isAnalyzing) {
if (isAnalyzing) {
updateStatus("Analyzing");
} else {
updateStatus("Processing");
}
}
/**
* Report the current status.
*
* @param task
* The string to report.
*/
public void updateStatus(final String task) {
boolean shouldDisplay = false;
if (this.currentRecord == 0) {
shouldDisplay = true;
}
this.currentRecord++;
this.lastUpdate++;
if (this.lastUpdate >= this.reportInterval) {
this.lastUpdate = 0;
shouldDisplay = true;
}
if (shouldDisplay) {
this.report.report(this.recordCount, this.currentRecord, task);
}
}
/**
* Validate that the file has been analyzed. Throw an error, if it has not.
*/
public void validateAnalyzed() {
if (!this.analyzed) {
throw new QuantError("File must be analyzed first.");
}
}
/**
* Write a row to the output file.
*
* @param tw
* The output stream.
* @param row
* The row to write out.
*/
public void writeRow(final PrintWriter tw, final LoadedRow row) {
final StringBuilder line = new StringBuilder();
for (int i = 0; i < row.getData().length; i++) {
BasicFile.appendSeparator(line, this.format);
line.append(row.getData()[i]);
}
tw.println(line.toString());
}
/**
* @return the script
*/
public AnalystScript getScript() {
return script;
}
/**
* @param theScript the script to set
*/
public void setScript(final AnalystScript theScript) {
this.script = theScript;
}
}
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