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/*******************************************************************************
* Copyright (c) 2008, 2013 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.transforms;
import java.io.*;
import java.net.URL;
import java.util.*;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import org.eclipse.osgi.framework.log.FrameworkLogEntry;
import org.eclipse.osgi.internal.framework.EquinoxContainer;
import org.eclipse.osgi.internal.log.EquinoxLogServices;
/**
* This class is used by the transformer hook to parse urls provided by transform developers that specifies the particular transforms that should be utilized for a particular transformer.
* TODO: factor this out into a new type of service the transformer uses. Then there could be CSV transforms, programatic transforms, etc.
*/
public class CSVParser {
/**
* Parse the given url as a CSV file containing transform tuples. The tuples have the form:
* <pre>
* bundleRegex,pathRegex,transformerResource
* </pre>
* @param transformMapURL the map url
* @return an array of tuples derived from the contents of the file
* @throws IOException thrown if there are issues parsing the file
*/
public static TransformTuple[] parse(URL transformMapURL, EquinoxLogServices logServices) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(transformMapURL.openStream()));
String currentLine = null;
List<TransformTuple> list = new ArrayList<TransformTuple>();
while ((currentLine = reader.readLine()) != null) {
if (currentLine.startsWith("#")) { //$NON-NLS-1$
continue;
}
currentLine = currentLine.trim();
if (currentLine.length() == 0)
continue;
StringTokenizer toker = new StringTokenizer(currentLine, ","); //$NON-NLS-1$
try {
String bundlePatternString = toker.nextToken().trim();
String pathPatternString = toker.nextToken().trim();
String transformPath = toker.nextToken().trim();
try {
Pattern bundlePattern = Pattern.compile(bundlePatternString);
Pattern pathPattern = Pattern.compile(pathPatternString);
URL transformerURL = new URL(transformMapURL, transformPath);
try {
transformerURL.openStream();
TransformTuple tuple = new TransformTuple();
tuple.bundlePattern = bundlePattern;
tuple.pathPattern = pathPattern;
tuple.transformerUrl = transformerURL;
list.add(tuple);
} catch (IOException e) {
logServices.log(EquinoxContainer.NAME, FrameworkLogEntry.ERROR, "Could not add transform :" + transformerURL.toString(), e); //$NON-NLS-1$
}
} catch (PatternSyntaxException e) {
logServices.log(EquinoxContainer.NAME, FrameworkLogEntry.ERROR, "Could not add compile transform matching regular expression", e); //$NON-NLS-1$
}
} catch (NoSuchElementException e) {
logServices.log(EquinoxContainer.NAME, FrameworkLogEntry.ERROR, "Could not parse transform file record :" + currentLine, e); //$NON-NLS-1$
}
}
return list.toArray(new TransformTuple[list.size()]);
}
}
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