    001    package org.maltparser.core.syntaxgraph.reader;
    002
    003    import java.io.BufferedReader;
    004    import java.io.FileInputStream;
    005    import java.io.FileNotFoundException;
    006    import java.io.IOException;
    007    import java.io.InputStream;
    008    import java.io.InputStreamReader;
    009    import java.io.UnsupportedEncodingException;
    010    import java.net.URL;
    011    import java.util.Iterator;
    012
    013    import org.maltparser.core.exception.MaltChainedException;
    014    import org.maltparser.core.io.dataformat.ColumnDescription;
    015    import org.maltparser.core.io.dataformat.DataFormatException;
    016    import org.maltparser.core.io.dataformat.DataFormatInstance;
    017    import org.maltparser.core.syntaxgraph.DependencyStructure;
    018    import org.maltparser.core.syntaxgraph.Element;
    019    import org.maltparser.core.syntaxgraph.TokenStructure;
    020    import org.maltparser.core.syntaxgraph.edge.Edge;
    021    /**
    022    *
    023    *
    024    * @author Johan Hall
    025    */
    026    public class TabReader implements SyntaxGraphReader {
    027            private BufferedReader reader;
    028            private int sentenceCount;
    029            private final StringBuilder input;
    030            private DataFormatInstance dataFormatInstance;
    031            private static final String IGNORE_COLUMN_SIGN = "_";
    032            private static final char TAB = '\t';
    033            private static final char NEWLINE = '\n';
    034            private static final char CARRIAGE_RETURN = '\r';
    035            private String fileName = null;
    036            private URL url = null;
    037            private String charsetName;
    038            private int nIterations;
    039            private int cIterations;
    040            private boolean closeStream = true;
    041
    042            public TabReader() {
    043                    input = new StringBuilder();
    044                    nIterations = 1;
    045                    cIterations = 1;
    046            }
    047
    048            private void reopen() throws MaltChainedException {
    049                    close();
    050                    if (fileName != null) {
    051                            open(fileName, charsetName);
    052                    } else if (url != null) {
    053                            open(url, charsetName);
    054                    } else {
    055                            throw new DataFormatException("The input stream cannot be reopen. ");
    056                    }
    057            }
    058
    059            public void open(String fileName, String charsetName) throws MaltChainedException {
    060                    setFileName(fileName);
    061                    setCharsetName(charsetName);
    062                    try {
    063                            open(new FileInputStream(fileName), charsetName);
    064                    } catch (FileNotFoundException e) {
    065                            throw new DataFormatException("The input file '"+fileName+"' cannot be found. ", e);
    066                    }
    067            }
    068
    069            public void open(URL url, String charsetName) throws MaltChainedException {
    070                    setUrl(url);
    071                    setCharsetName(charsetName);
    072                    if (url == null) {
    073                            throw new DataFormatException("The input file cannot be found. ");
    074                    }
    075                    try {
    076                            open(url.openStream(), charsetName);
    077                    } catch (IOException e) {
    078                            throw new DataFormatException("The URL '"+url.toString()+"' cannot be opened. ", e);
    079                    }
    080            }
    081
    082            public void open(InputStream is, String charsetName) throws MaltChainedException {
    083                    try {
    084                            if (is == System.in) {
    085                                    closeStream = false;
    086                            }
    087                            open(new InputStreamReader(is, charsetName));
    088                    } catch (UnsupportedEncodingException e) {
    089                            throw new DataFormatException("The character encoding set '"+charsetName+"' isn't supported. ", e);
    090                    }
    091            }
    092
    093            private void open(InputStreamReader isr) throws MaltChainedException {
    094                    setReader(new BufferedReader(isr));
    095                    setSentenceCount(0);
    096            }
    097
    098            public void readProlog() throws MaltChainedException {
    099
    100            }
    101
    102            public boolean readSentence(TokenStructure syntaxGraph) throws MaltChainedException  {
    103                    if (syntaxGraph == null || dataFormatInstance == null) {
    104                            return false;
    105                    }
    106
    107                    Element node = null;
    108                    Edge edge = null;
    109                    input.setLength(0);
    110                    int i = 0;
    111                    int terminalCounter = 0;
    112                    int nNewLines = 0;
    113                    syntaxGraph.clear();
    114                    Iterator<ColumnDescription> columns = dataFormatInstance.iterator();
    115                    while (true) {
    116                            int c;
    117
    118                            try {
    119                                    c = reader.read();
    120                            } catch (IOException e) {
    121                                    close();
    122                                    throw new DataFormatException("Error when reading from the input file. ", e);
    123                            }
    124                            if (c == TAB || c == NEWLINE || c == CARRIAGE_RETURN || c == -1) {
    125                                    if (input.length() != 0) {
    126                                            if (i == 0) {
    127                                                    terminalCounter++;
    128                                                    node = syntaxGraph.addTokenNode(terminalCounter);
    129                                            }
    130                                            ColumnDescription column = null;
    131                                            if (columns.hasNext()) {
    132                                                    column = columns.next();
    133                                                    if (column.getCategory() == ColumnDescription.INPUT && node != null) {
    134                                                            syntaxGraph.addLabel(node, column.getName(), input.toString());
    135                                                    } else if (column.getCategory() == ColumnDescription.HEAD) {
    136                                                            if (syntaxGraph instanceof DependencyStructure) {
    137                                                                    if (column.getType() != ColumnDescription.IGNORE && !input.toString().equals(IGNORE_COLUMN_SIGN)) { // bugfix
    138                                                                    //if (!input.toString().equals(IGNORE_COLUMN_SIGN)) {
    139                                                                            edge = ((DependencyStructure)syntaxGraph).addDependencyEdge(Integer.parseInt(input.toString()), terminalCounter);
    140                                                                    }
    141                                                            }
    142                                                            else {
    143                                                                    close();
    144                                                                    throw new DataFormatException("The input graph is not a dependency graph and therefore it is not possible to add dependncy edges. ");
    145                                                            }
    146                                                    } else if (column.getCategory() == ColumnDescription.DEPENDENCY_EDGE_LABEL && edge != null) {
    147                                                            //if (column.getType() != ColumnDescription.IGNORE && !input.toString().equals(IGNORE_COLUMN_SIGN)) { // bugfix not working for everybody
    148                                                                    syntaxGraph.addLabel(edge, column.getName(), input.toString());
    149                                                            //} // bugfix
    150                                                    }
    151                                            }
    152                                            input.setLength(0);
    153                                            nNewLines = 0;
    154                                            i++;
    155                                    } else if (c == TAB) {
    156                                            throw new MaltChainedException("The input file '"+fileName+"' contains a column where the value is an empty string. Please check your input file. ");
    157                                    }
    158                                    if (c == NEWLINE) {
    159                                            nNewLines++;
    160                                            i = 0;
    161                                            columns = dataFormatInstance.iterator();
    162                                    }
    163                            } else {
    164                                    input.append((char)c);
    165                            }
    166
    167                            if (nNewLines == 2 && c == NEWLINE) {
    168                                    if (syntaxGraph.hasTokens()) {
    169                                            sentenceCount++;
    170                                    }
    171                                    return true;
    172                            } else if (c == -1) {
    173                                    if (syntaxGraph.hasTokens()) {
    174                                            sentenceCount++;
    175                                    }
    176                                    if (cIterations < nIterations) {
    177                                            cIterations++;
    178                                            reopen();
    179                                            return true;
    180                                    }
    181
    182                                    return false;
    183                            }
    184                    }
    185            }
    186
    187            public void readEpilog() throws MaltChainedException {
    188
    189            }
    190
    191            public BufferedReader getReader() {
    192                    return reader;
    193            }
    194
    195            public void setReader(BufferedReader reader) throws MaltChainedException {
    196                    close();
    197                    this.reader = reader;
    198            }
    199
    200            public DataFormatInstance getDataFormatInstance() {
    201                    return dataFormatInstance;
    202            }
    203
    204            public void setDataFormatInstance(DataFormatInstance dataFormatInstance) {
    205                    this.dataFormatInstance = dataFormatInstance;
    206            }
    207
    208            public int getSentenceCount() throws MaltChainedException {
    209                    return sentenceCount;
    210            }
    211
    212            public void setSentenceCount(int sentenceCount) {
    213                    this.sentenceCount = sentenceCount;
    214            }
    215
    216            public String getOptions() {
    217                    return null;
    218            }
    219
    220            public void setOptions(String optionString) throws MaltChainedException {
    221
    222            }
    223
    224            public String getFileName() {
    225                    return fileName;
    226            }
    227
    228            public void setFileName(String fileName) {
    229                    this.fileName = fileName;
    230            }
    231
    232            public URL getUrl() {
    233                    return url;
    234            }
    235
    236            public void setUrl(URL url) {
    237                    this.url = url;
    238            }
    239
    240            public String getCharsetName() {
    241                    return charsetName;
    242            }
    243
    244            public void setCharsetName(String charsetName) {
    245                    this.charsetName = charsetName;
    246            }
    247
    248            public int getNIterations() {
    249                    return nIterations;
    250            }
    251
    252            public void setNIterations(int iterations) {
    253                    nIterations = iterations;
    254            }
    255
    256            public int getIterationCounter() {
    257                    return cIterations;
    258            }
    259
    260            public void close() throws MaltChainedException {
    261                    try {
    262                            if (reader != null) {
    263                                    if (closeStream) {
    264                                            reader.close();
    265                                    }
    266                                    reader = null;
    267                            }
    268                    } catch (IOException e) {
    269                            throw new DataFormatException("Error when closing the input file. ", e);
    270                    }
    271            }
    272
    273            public void clear() throws MaltChainedException {
    274                    close();
    275                    input.setLength(0);
    276                    dataFormatInstance = null;
    277                    sentenceCount = 0;
    278            }
    279    }