Java tutorial
/* Copyright (C) 2005-2014, by the President and Fellows of Harvard College. 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. Dataverse Network - A web application to share, preserve and analyze research data. Developed at the Institute for Quantitative Social Science, Harvard University. Version 3.0. */ package edu.harvard.iq.dataverse.ingest.tabulardata.impl.plugins.por; import edu.harvard.iq.dataverse.ingest.tabulardata.TabularDataFileReader; import edu.harvard.iq.dataverse.ingest.tabulardata.spi.TabularDataFileReaderSpi; import java.io.*; import java.nio.*; import java.nio.channels.*; import java.util.logging.*; import javax.imageio.IIOException; import java.util.*; import org.apache.commons.codec.binary.Hex; /** * Service Provider registration class for the SPSS/POR ingest plugin. * Based on the code originally developed by Akio Sone, HMDC/ODUM * for v.2 of the DVN. * * @author Leonid Andreev * original * @author Akio Sone */ public class PORFileReaderSpi extends TabularDataFileReaderSpi { private static Logger dbgLog = Logger.getLogger(PORFileReaderSpi.class.getPackage().getName()); private static int POR_HEADER_SIZE = 500; public static int POR_MARK_POSITION_DEFAULT = 461; public static String POR_MARK = "SPSSPORT"; private boolean windowsNewLine = true; private static String[] formatNames = { "por", "POR" }; private static String[] extensions = { "por" }; private static String[] mimeType = { "application/x-spss-por" }; public PORFileReaderSpi() { super("HU-IQSS-DataVerse-project", "4.0", formatNames, extensions, mimeType, "edu.harvard.iq.dataverse.ingest.tabulardata.impl.plugins.por.PORFileReaderSpi"); dbgLog.fine("PORFileReaderSpi is called"); } @Override public boolean canDecodeInput(Object source) throws IOException { if (!(source instanceof BufferedInputStream)) { return false; } if (source == null) { throw new IllegalArgumentException("source == null!"); } BufferedInputStream stream = (BufferedInputStream) source; dbgLog.fine("applying the por test\n"); byte[] b = new byte[POR_HEADER_SIZE]; if (stream.markSupported()) { stream.mark(0); } int nbytes = stream.read(b, 0, POR_HEADER_SIZE); //printHexDump(b, "hex dump of the byte-array"); if (nbytes == 0) { throw new IOException(); } else if (nbytes < 491) { // size test dbgLog.fine("this file is NOT spss-por type"); return false; } if (stream.markSupported()) { stream.reset(); } boolean DEBUG = false; //windows [0D0A]=> [1310] = [CR/LF] //unix [0A] => [10] //mac [0D] => [13] // 3char [0D0D0A]=> [131310] spss for windows rel 15 // expected results // unix case: [0A] : [80], [161], [242], [323], [404], [485] // windows case: [0D0A] : [81], [163], [245], [327], [409], [491] // : [0D0D0A] : [82], [165], [248], [331], [414], [495] // convert b into a ByteBuffer ByteBuffer buff = ByteBuffer.wrap(b); byte[] nlch = new byte[36]; int pos1; int pos2; int pos3; int ucase = 0; int wcase = 0; int mcase = 0; int three = 0; int nolines = 6; int nocols = 80; for (int i = 0; i < nolines; ++i) { int baseBias = nocols * (i + 1); // 1-char case pos1 = baseBias + i; buff.position(pos1); dbgLog.finer("\tposition(1)=" + buff.position()); int j = 6 * i; nlch[j] = buff.get(); if (nlch[j] == 10) { ucase++; } else if (nlch[j] == 13) { mcase++; } // 2-char case pos2 = baseBias + 2 * i; buff.position(pos2); dbgLog.finer("\tposition(2)=" + buff.position()); nlch[j + 1] = buff.get(); nlch[j + 2] = buff.get(); // 3-char case pos3 = baseBias + 3 * i; buff.position(pos3); dbgLog.finer("\tposition(3)=" + buff.position()); nlch[j + 3] = buff.get(); nlch[j + 4] = buff.get(); nlch[j + 5] = buff.get(); dbgLog.finer(i + "-th iteration position =" + nlch[j] + "\t" + nlch[j + 1] + "\t" + nlch[j + 2]); dbgLog.finer(i + "-th iteration position =" + nlch[j + 3] + "\t" + nlch[j + 4] + "\t" + nlch[j + 5]); if ((nlch[j + 3] == 13) && (nlch[j + 4] == 13) && (nlch[j + 5] == 10)) { three++; } else if ((nlch[j + 1] == 13) && (nlch[j + 2] == 10)) { wcase++; } buff.rewind(); } if (three == nolines) { dbgLog.fine("0D0D0A case"); windowsNewLine = false; } else if ((ucase == nolines) && (wcase < nolines)) { dbgLog.fine("0A case"); windowsNewLine = false; } else if ((ucase < nolines) && (wcase == nolines)) { dbgLog.fine("0D0A case"); } else if ((mcase == nolines) && (wcase < nolines)) { dbgLog.fine("0D case"); windowsNewLine = false; } buff.rewind(); int PORmarkPosition = POR_MARK_POSITION_DEFAULT; if (windowsNewLine) { PORmarkPosition = PORmarkPosition + 5; } else if (three == nolines) { PORmarkPosition = PORmarkPosition + 10; } byte[] pormark = new byte[8]; buff.position(PORmarkPosition); buff.get(pormark, 0, 8); String pormarks = new String(pormark); dbgLog.fine( "pormark[hex: 53 50 53 53 50 4F 52 54 == SPSSPORT] =>" + new String(Hex.encodeHex(pormark)) + "<-"); if (pormarks.equals(POR_MARK)) { dbgLog.fine("this file is spss-por type"); return true; } else { dbgLog.fine("this file is NOT spss-por type"); } return false; } @Override public boolean canDecodeInput(BufferedInputStream stream) throws IOException { if (stream == null) { throw new IllegalArgumentException("file == null!"); } dbgLog.fine("applying the por test\n"); byte[] b = new byte[POR_HEADER_SIZE]; if (stream.markSupported()) { stream.mark(0); } int nbytes = stream.read(b, 0, POR_HEADER_SIZE); //printHexDump(b, "hex dump of the byte-array"); if (nbytes == 0) { throw new IOException(); } else if (nbytes < 491) { // size test dbgLog.fine("this file is NOT spss-por type"); return false; } if (stream.markSupported()) { stream.reset(); } boolean DEBUG = false; //windows [0D0A]=> [1310] = [CR/LF] //unix [0A] => [10] //mac [0D] => [13] // 3char [0D0D0A]=> [131310] spss for windows rel 15 // expected results // unix case: [0A] : [80], [161], [242], [323], [404], [485] // windows case: [0D0A] : [81], [163], [245], [327], [409], [491] // : [0D0D0A] : [82], [165], [248], [331], [414], [495] // convert b into a ByteBuffer ByteBuffer buff = ByteBuffer.wrap(b); byte[] nlch = new byte[36]; int pos1; int pos2; int pos3; int ucase = 0; int wcase = 0; int mcase = 0; int three = 0; int nolines = 6; int nocols = 80; for (int i = 0; i < nolines; ++i) { int baseBias = nocols * (i + 1); // 1-char case pos1 = baseBias + i; buff.position(pos1); dbgLog.finer("\tposition(1)=" + buff.position()); int j = 6 * i; nlch[j] = buff.get(); if (nlch[j] == 10) { ucase++; } else if (nlch[j] == 13) { mcase++; } // 2-char case pos2 = baseBias + 2 * i; buff.position(pos2); dbgLog.finer("\tposition(2)=" + buff.position()); nlch[j + 1] = buff.get(); nlch[j + 2] = buff.get(); // 3-char case pos3 = baseBias + 3 * i; buff.position(pos3); dbgLog.finer("\tposition(3)=" + buff.position()); nlch[j + 3] = buff.get(); nlch[j + 4] = buff.get(); nlch[j + 5] = buff.get(); dbgLog.finer(i + "-th iteration position =" + nlch[j] + "\t" + nlch[j + 1] + "\t" + nlch[j + 2]); dbgLog.finer(i + "-th iteration position =" + nlch[j + 3] + "\t" + nlch[j + 4] + "\t" + nlch[j + 5]); if ((nlch[j + 3] == 13) && (nlch[j + 4] == 13) && (nlch[j + 5] == 10)) { three++; } else if ((nlch[j + 1] == 13) && (nlch[j + 2] == 10)) { wcase++; } buff.rewind(); } if (three == nolines) { dbgLog.fine("0D0D0A case"); windowsNewLine = false; } else if ((ucase == nolines) && (wcase < nolines)) { dbgLog.fine("0A case"); windowsNewLine = false; } else if ((ucase < nolines) && (wcase == nolines)) { dbgLog.fine("0D0A case"); } else if ((mcase == nolines) && (wcase < nolines)) { dbgLog.fine("0D case"); windowsNewLine = false; } buff.rewind(); int PORmarkPosition = POR_MARK_POSITION_DEFAULT; if (windowsNewLine) { PORmarkPosition = PORmarkPosition + 5; } else if (three == nolines) { PORmarkPosition = PORmarkPosition + 10; } byte[] pormark = new byte[8]; buff.position(PORmarkPosition); buff.get(pormark, 0, 8); String pormarks = new String(pormark); //dbgLog.fine("pormark =>" + pormarks + "<-"); dbgLog.fine( "pormark[hex: 53 50 53 53 50 4F 52 54 == SPSSPORT] =>" + new String(Hex.encodeHex(pormark)) + "<-"); if (pormarks.equals(POR_MARK)) { dbgLog.fine("this file is spss-por type"); return true; } else { dbgLog.fine("this file is NOT spss-por type"); } return false; } @Override public boolean canDecodeInput(File file) throws IOException { if (file == null) { throw new IllegalArgumentException("file == null!"); } if (!file.canRead()) { throw new IOException("cannot read the input file"); } // set-up a FileChannel instance for a given file object FileChannel srcChannel = new FileInputStream(file).getChannel(); // create a read-only MappedByteBuffer MappedByteBuffer buff = srcChannel.map(FileChannel.MapMode.READ_ONLY, 0, POR_HEADER_SIZE); //printHexDump(buff, "hex dump of the byte-buffer"); buff.rewind(); boolean DEBUG = false; dbgLog.fine("applying the spss-por test\n"); // size test if (buff.capacity() < 491) { dbgLog.fine("this file is NOT spss-por type"); return false; } //windows [0D0A]=> [1310] = [CR/LF] //unix [0A] => [10] //mac [0D] => [13] // 3char [0D0D0A]=> [131310] spss for windows rel 15 // expected results // unix case: [0A] : [80], [161], [242], [323], [404], [485] // windows case: [0D0A] : [81], [163], [245], [327], [409], [491] // : [0D0D0A] : [82], [165], [248], [331], [414], [495] buff.rewind(); byte[] nlch = new byte[36]; int pos1; int pos2; int pos3; int ucase = 0; int wcase = 0; int mcase = 0; int three = 0; int nolines = 6; int nocols = 80; for (int i = 0; i < nolines; ++i) { int baseBias = nocols * (i + 1); // 1-char case pos1 = baseBias + i; buff.position(pos1); dbgLog.finer("\tposition(1)=" + buff.position()); int j = 6 * i; nlch[j] = buff.get(); if (nlch[j] == 10) { ucase++; } else if (nlch[j] == 13) { mcase++; } // 2-char case pos2 = baseBias + 2 * i; buff.position(pos2); dbgLog.finer("\tposition(2)=" + buff.position()); nlch[j + 1] = buff.get(); nlch[j + 2] = buff.get(); // 3-char case pos3 = baseBias + 3 * i; buff.position(pos3); dbgLog.finer("\tposition(3)=" + buff.position()); nlch[j + 3] = buff.get(); nlch[j + 4] = buff.get(); nlch[j + 5] = buff.get(); dbgLog.finer(i + "-th iteration position =" + nlch[j] + "\t" + nlch[j + 1] + "\t" + nlch[j + 2]); dbgLog.finer(i + "-th iteration position =" + nlch[j + 3] + "\t" + nlch[j + 4] + "\t" + nlch[j + 5]); if ((nlch[j + 3] == 13) && (nlch[j + 4] == 13) && (nlch[j + 5] == 10)) { three++; } else if ((nlch[j + 1] == 13) && (nlch[j + 2] == 10)) { wcase++; } buff.rewind(); } if (three == nolines) { dbgLog.fine("0D0D0A case"); windowsNewLine = false; } else if ((ucase == nolines) && (wcase < nolines)) { dbgLog.fine("0A case"); windowsNewLine = false; } else if ((ucase < nolines) && (wcase == nolines)) { dbgLog.fine("0D0A case"); } else if ((mcase == nolines) && (wcase < nolines)) { dbgLog.fine("0D case"); windowsNewLine = false; } buff.rewind(); int PORmarkPosition = POR_MARK_POSITION_DEFAULT; if (windowsNewLine) { PORmarkPosition = PORmarkPosition + 5; } else if (three == nolines) { PORmarkPosition = PORmarkPosition + 10; } byte[] pormark = new byte[8]; buff.position(PORmarkPosition); buff.get(pormark, 0, 8); String pormarks = new String(pormark); dbgLog.fine("pormark =>" + pormarks + "<-"); if (pormarks.equals(POR_MARK)) { dbgLog.fine("this file is spss-por type"); return true; } else { dbgLog.fine("this file is NOT spss-por type"); } return false; } public String getDescription(Locale locale) { return "HU-IQSS-DataVerse-project SPSS/POR (\"portable\") File Ingest plugin"; } @Override public TabularDataFileReader createReaderInstance(Object ext) throws IIOException { return new PORFileReader(this); } }