Mercurial > dive4elements > river
view flys-backend/src/main/java/de/intevation/flys/importer/PRFParser.java @ 1196:46127af605ba
Added parser for PRF files. TODO: Extract data and km.
flys-backend/trunk@2296 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Wed, 06 Jul 2011 17:54:49 +0000 |
parents | |
children | ce3dacc6ea92 |
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package de.intevation.flys.importer; import java.util.Map; import java.util.Stack; import java.util.TreeMap; import java.util.regex.Pattern; import java.util.regex.Matcher; import java.io.File; import java.io.InputStreamReader; import java.io.LineNumberReader; import java.io.FileInputStream; import java.io.IOException; import org.apache.log4j.Logger; public class PRFParser { private static Logger log = Logger.getLogger(PRFParser.class); public static final String ENCODING = System.getProperty("flys.backend.prf.encoding", "ISO-8859-1"); public static final Pattern DATA_PATTERN = Pattern.compile( "\\((\\d+)x\\s*,\\s*(\\d+)\\(" + "\\s*f(\\d+)\\.(\\d+)\\s*,\\s*f(\\d+)\\.(\\d+)\\s*\\)?\\)?"); public static final Pattern KM_PATTERN = Pattern.compile("\\((\\d+)x\\s*,\\s*f(\\d+)\\.(\\d+)\\s*\\)?"); public static class DataFormat { protected int deleteChars; protected int maxRepetitions; protected int firstIntegerPlaces; protected int firstFractionPlaces; protected int secondIntegerPlaces; protected int secondFractionPlaces; public DataFormat() { } public DataFormat(Matcher m) { deleteChars = Integer.parseInt(m.group(1)); maxRepetitions = Integer.parseInt(m.group(2)); firstIntegerPlaces = Integer.parseInt(m.group(3)); firstFractionPlaces = Integer.parseInt(m.group(4)); secondIntegerPlaces = Integer.parseInt(m.group(5)); secondFractionPlaces = Integer.parseInt(m.group(6)); } public void extractData(String line, Map<Double, Double> dest) { //TODO: Implement me! } } // class DataFormat public static class KMFormat { protected int deleteChars; protected int integerPlaces; protected int fractionPlaces; public KMFormat() { } public KMFormat(Matcher m) { deleteChars = Integer.parseInt(m.group(1)); integerPlaces = Integer.parseInt(m.group(2)); fractionPlaces = Integer.parseInt(m.group(3)); } public double extractKm(String line) { // TODO: Implement me! return 0d; } } // class KMFormat protected Map<Double, Map<Double, Double>> data; public PRFParser() { data = new TreeMap<Double, Map<Double, Double>>(); } public boolean parse(File file) { if (!(file.isFile() && file.canRead())) { log.warn("cannot open file '" + file + "'"); return false; } log.info("parsing PRF file: '" + file + "'"); LineNumberReader in = null; try { in = new LineNumberReader( new InputStreamReader( new FileInputStream(file), ENCODING)); String line = in.readLine(); if (line == null || (line = line.trim()).length() == 0) { log.warn("file is empty."); return false; } Matcher m = DATA_PATTERN.matcher(line); if (!m.matches()) { log.warn("First line does not look like a PRF data pattern."); return false; } DataFormat dataFormat = new DataFormat(m); if ((line = in.readLine()) == null) { log.warn("premature EOF. Expected integer in line 2"); return false; } try { if (Integer.parseInt(line) != dataFormat.maxRepetitions) { log.warn("Expected " + dataFormat.maxRepetitions + " in line 2"); return false; } } catch (NumberFormatException nfe) { log.warn("invalid integer in line 2", nfe); return false; } if ((line = in.readLine()) == null) { log.warn( "premature EOF. Expected pattern for km extraction"); return false; } m = KM_PATTERN.matcher(line); if (!m.matches()) { log.warn( "line 4 does not look like a PRF km extraction pattern."); return false; } while ((line = in.readLine()) != null) { if (line.length() == 0) { continue; } // TODO: Do data and km extraction } } catch (IOException ioe) { log.error(ioe); return false; } finally { if (in != null) { try { in.close(); } catch (IOException ioe) { log.error(ioe); } } } return true; } public void reset() { data.clear(); } public static void parsePRFs(File root) { PRFParser parser = new PRFParser(); Stack<File> stack = new Stack<File>(); stack.push(root); while (!stack.empty()) { File file = stack.pop(); if (file.isDirectory()) { File [] files = file.listFiles(); if (files != null) { for (File f: files) { stack.push(f); } } } else if (file.isFile() && file.getName().toLowerCase().endsWith(".prf") ) { parser.reset(); boolean success = parser.parse(file); log.info("parsing " + (success ? "succeeded" : "failed")); } } } public static void main(String [] args) { for (String arg: args) { parsePRFs(new File(arg)); } } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :