+
−/*
+
− * This Source Code Form is subject to the terms of the Mozilla Public
+
− * License, v. 2.0.  If a copy of the MPL was not distributed with this
+
− * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
− *
+
− * Copyright 1997 - July 2008 CWI, August 2008 - 2017 MonetDB B.V.
+
− */
+
−
+
−package nl.cwi.monetdb.mcl.protocol.oldmapi;
+
−
+
−import nl.cwi.monetdb.jdbc.MonetBlob;
+
−import nl.cwi.monetdb.jdbc.MonetClob;
+
−import nl.cwi.monetdb.mcl.connection.helpers.BufferReallocator;
+
−import nl.cwi.monetdb.mcl.connection.helpers.GregorianCalendarParser;
+
−import nl.cwi.monetdb.mcl.protocol.ProtocolException;
+
−
+
−import java.math.BigDecimal;
+
−import java.math.BigInteger;
+
−import java.nio.CharBuffer;
+
−import java.sql.Types;
+
−import java.text.ParsePosition;
+
−import java.util.Calendar;
+
−
+
−/**
+
− * The OldMapiTupleLineParser extracts the values from a given tuple. The number of values that are expected are known
+
− * upfront to speed up allocation and validation. For null values we will map into Java minimum values for primitives
+
− * and null pointers for objects.
+
− *
+
− * @author Fabian Groffen, Pedro Ferreira
+
− */
+
−final class OldMapiTupleLineParser {
+
−
+
−    /**
+
−     * The character array representation of a NULL value found in a tuple.
+
−     */
+
−    private static final char[] NULL_STRING = new char[]{'N','U','L','L'};
+
−
+
−    /**
+
−     * A Java parser to parse Date, Time and Timestamp data, to be reused during the connection to save memory
+
−     * allocation.
+
−     */
+
−    private static final ParsePosition Ppos = new ParsePosition(0);
+
−
+
−    /**
+
−     * Parses the given OldMapiProtocol's lineBuffer source as tuple line for a DataBlock. If source cannot be parsed, a
+
−     * ProtocolException is thrown. The OldMapiProtocol's tupleLineBuffer is used to help parsing a column value.
+
−     *
+
−     * @param protocol The OldMapiProtocol instance to parse its lineBuffer
+
−     * @param lineNumber The row line number on the DataBlock to insert the tuple
+
−     * @param typesMap The JDBC types mapping array
+
−     * @param values An array of columns to fill the parsed values
+
−     * @return The number of columns parsed
+
−     * @throws ProtocolException If an error occurs during parsing
+
−     */
+
−    static int OldMapiParseTupleLine(OldMapiProtocol protocol, int lineNumber, int[] typesMap, Object[] values)
+
−            throws ProtocolException {
+
−        CharBuffer lineBuffer = protocol.lineBuffer;
+
−        CharBuffer tupleLineBuffer = protocol.tupleLineBuffer;
+
−
+
−        int len = lineBuffer.limit();
+
−        char[] array = lineBuffer.array();
+
−
+
−        // first detect whether this is a single value line (=) or a real tuple ([)
+
−        if (array[0] == '=') {
+
−            if (typesMap.length != 1) {
+
−                throw new ProtocolException(typesMap.length + " columns expected, but only single value found");
+
−            }
+
−            // return the whole string but the leading =
+
−            OldMapiStringToJavaDataConversion(array, 1, len - 1, lineNumber, values[0], typesMap[0]);
+
−            return 1;
+
−        }
+
−
+
−        // extract separate fields by examining string, char for char
+
−        boolean inString = false, escaped = false;
+
−        int cursor = 2, column = 0, i = 2;
+
−        for (; i < len; i++) {
+
−            switch(array[i]) {
+
−                default:
+
−                    escaped = false;
+
−                    break;
+
−                case '\\':
+
−                    escaped = !escaped;
+
−                    break;
+
−                case '"':
+
−                    /**
+
−                     * If all strings are wrapped between two quotes, a \" can never exist outside a string. Thus if we
+
−                     * believe that we are not within a string, we can safely assume we're about to enter a string if we
+
−                     * find a quote. If we are in a string we should stop being in a string if we find a quote which is
+
−                     * not prefixed by a \, for that would be an escaped quote. However, a nasty situation can occur
+
−                     * where the string is like "test \\" as obvious, a test for a \ in front of a " doesn't hold here
+
−                     * for all cases. Because "test \\\"" can exist as well, we need to know if a quote is prefixed by
+
−                     * an escaping slash or not.
+
−                     */
+
−                    if (!inString) {
+
−                        inString = true;
+
−                    } else if (!escaped) {
+
−                        inString = false;
+
−                    }
+
−                    // reset escaped flag
+
−                    escaped = false;
+
−                    break;
+
−                case '\t':
+
−                    if (!inString && (i > 0 && array[i - 1] == ',') || (i + 1 == len - 1 && array[++i] == ']')) { // dirty
+
−                        // split!
+
−                        if (array[cursor] == '"' && array[i - 2] == '"') {
+
−                            // reuse the tupleLineBuffer by cleaning it and ensure the capacity
+
−                            tupleLineBuffer.clear();
+
−                            tupleLineBuffer = BufferReallocator.EnsureCapacity(tupleLineBuffer, (i - 2) - (cursor + 1));
+
−
+
−                            for (int pos = cursor + 1; pos < i - 2; pos++) {
+
−                                if (array[cursor] == '\\' && pos + 1 < i - 2) {
+
−                                    pos++;
+
−                                    // strToStr and strFromStr in gdk_atoms.mx only support \t \n \\ \" and \377
+
−                                    switch (array[pos]) {
+
−                                        case '\\':
+
−                                            tupleLineBuffer.put('\\');
+
−                                            break;
+
−                                        case 'n':
+
−                                            tupleLineBuffer.put('\n');
+
−                                            break;
+
−                                        case 't':
+
−                                            tupleLineBuffer.put('\t');
+
−                                            break;
+
−                                        case '"':
+
−                                            tupleLineBuffer.put('"');
+
−                                            break;
+
−                                        case '0': case '1': case '2': case '3':
+
−                                            // this could be an octal number, let's check it out
+
−                                            if (pos + 2 < i - 2 && array[pos + 1] >= '0' && array[pos + 1] <= '7' &&
+
−                                                    array[pos + 2] >= '0' && array[pos + 2] <= '7') {
+
−                                                // we got the number!
+
−                                                try {
+
−                                                    tupleLineBuffer.put((char)(Integer.parseInt("" + array[pos] + array[pos + 1] + array[pos + 2], 8)));
+
−                                                    pos += 2;
+
−                                                } catch (NumberFormatException e) {
+
−                                                    // hmmm, this point should never be reached actually...
+
−                                                    throw new AssertionError("Flow error, should never try to parse non-number");
+
−                                                }
+
−                                            } else {
+
−                                                // do default action if number seems not to be correct
+
−                                                tupleLineBuffer.put(array[pos]);
+
−                                            }
+
−                                            break;
+
−                                        default:
+
−                                            // this is wrong, just ignore the escape, and print the char
+
−                                            tupleLineBuffer.put(array[pos]);
+
−                                            break;
+
−                                    }
+
−                                } else {
+
−                                    tupleLineBuffer.put(array[pos]);
+
−                                }
+
−                            }
+
−                            // put the unescaped string in the right place
+
−                            tupleLineBuffer.flip();
+
−                            OldMapiStringToJavaDataConversion(tupleLineBuffer.array(), 0, tupleLineBuffer.limit(), lineNumber, values[column], typesMap[column]);
+
−                        } else if ((i - 1) - cursor == 4 && OldMapiTupleLineParserHelper.CharIndexOf(array, array.length, NULL_STRING, 4) == cursor) {
+
−                            SetNullValue(lineNumber, values[column], typesMap[column]);
+
−                        } else {
+
−                            OldMapiStringToJavaDataConversion(array, cursor, i - 1 - cursor, lineNumber, values[column], typesMap[column]);
+
−                        }
+
−                        column++;
+
−                        cursor = i + 1;
+
−                    }
+
−                    // reset escaped flag
+
−                    escaped = false;
+
−                    break;
+
−            }
+
−        }
+
−
+
−        protocol.tupleLineBuffer = tupleLineBuffer;
+
−        // check if this result is of the size we expected it to be
+
−        if (column != typesMap.length)
+
−            throw new ProtocolException("illegal result length: " + column + "\nlast read: " + (column > 0 ? values[column - 1] : "<none>"));
+
−        return column;
+
−    }
+
−
+
−    /**
+
−     * Parses a BLOB String from a tuple column, converting it into a Java byte[] representation.
+
−     *
+
−     * @param toParse The CharBuffer's backing array
+
−     * @param startPosition The first position in the array to parse
+
−     * @param count The number of characters to read from the starter position
+
−     * @return A Java byte[] instance with the parsed BLOB
+
−     */
+
−    private static byte[] BinaryBlobConverter(char[] toParse, int startPosition, int count) {
+
−        int len = (startPosition + count) / 2;
+
−        byte[] res = new byte[len];
+
−        for (int i = 0; i < len; i++) {
+
−            res[i] = (byte) Integer.parseInt(new String(toParse, 2 * i, (2 * i) + 2), 16);
+
−        }
+
−        return res;
+
−    }
+
−
+
−    /**
+
−     * Converts a segment of a CharBuffer's backing array into a Java primitive or object depending on the JDBC Mapping.
+
−     *
+
−     * @param toParse The CharBuffer's backing array
+
−     * @param startPosition The first position in the array to parse
+
−     * @param count The number of characters to read from the starter position
+
−     * @param lineNumber The row line number on the DataBlock to insert the tuple
+
−     * @param columnArray The column array where the value will be appended
+
−     * @param jDBCMapping The JDBC mapping of the value
+
−     * @throws ProtocolException If the JDBC Mapping is unknown
+
−     */
+
−    private static void OldMapiStringToJavaDataConversion(char[] toParse, int startPosition, int count, int lineNumber,
+
−                                                          Object columnArray, int jDBCMapping) throws ProtocolException {
+
−        switch (jDBCMapping) {
+
−            case Types.BOOLEAN:
+
−                ((byte[]) columnArray)[lineNumber] = OldMapiTupleLineParserHelper.CharArrayToBoolean(toParse, startPosition, count);
+
−                break;
+
−            case Types.TINYINT:
+
−                ((byte[]) columnArray)[lineNumber] = OldMapiTupleLineParserHelper.CharArrayToByte(toParse, startPosition, count);
+
−                break;
+
−            case Types.SMALLINT:
+
−                ((short[]) columnArray)[lineNumber] = OldMapiTupleLineParserHelper.CharArrayToShort(toParse, startPosition, count);
+
−                break;
+
−            case Types.INTEGER:
+
−                ((int[]) columnArray)[lineNumber] = OldMapiTupleLineParserHelper.CharArrayToInt(toParse, startPosition, count);
+
−                break;
+
−            case Types.BIGINT:
+
−                ((long[]) columnArray)[lineNumber] = OldMapiTupleLineParserHelper.CharArrayToLong(toParse, startPosition, count);
+
−                break;
+
−            case Types.REAL:
+
−                ((float[]) columnArray)[lineNumber] = Float.parseFloat(new String(toParse, startPosition, count));
+
−                break;
+
−            case Types.DOUBLE:
+
−                ((double[]) columnArray)[lineNumber] = Double.parseDouble(new String(toParse, startPosition, count));
+
−                break;
+
−            case Types.DECIMAL:
+
−                ((BigDecimal[]) columnArray)[lineNumber] = new BigDecimal(toParse, startPosition, count);
+
−                break;
+
−            case Types.NUMERIC:
+
−                ((BigInteger[]) columnArray)[lineNumber] = new BigInteger(new String(toParse, startPosition, count));
+
−                break;
+
−            case Types.CHAR:
+
−            case Types.VARCHAR:
+
−            case Types.LONGVARCHAR:
+
−            case Types.OTHER:
+
−                ((String[]) columnArray)[lineNumber] = new String(toParse, startPosition, count);
+
−                break;
+
−            case Types.DATE:
+
−                ((Calendar[]) columnArray)[lineNumber] = GregorianCalendarParser.ParseDate(new String(toParse, startPosition, count), Ppos);
+
−                break;
+
−            case Types.TIME:
+
−                ((Calendar[]) columnArray)[lineNumber] = GregorianCalendarParser.ParseTime(new String(toParse, startPosition, count), Ppos, false);
+
−                break;
+
−            case Types.TIME_WITH_TIMEZONE:
+
−                ((Calendar[]) columnArray)[lineNumber] = GregorianCalendarParser.ParseTime(new String(toParse, startPosition, count), Ppos, true);
+
−                break;
+
−            case Types.TIMESTAMP:
+
−                ((Calendar[]) columnArray)[lineNumber] = GregorianCalendarParser.ParseTimestamp(new String(toParse, startPosition, count), Ppos, false);
+
−                break;
+
−            case Types.TIMESTAMP_WITH_TIMEZONE:
+
−                ((Calendar[]) columnArray)[lineNumber] = GregorianCalendarParser.ParseTimestamp(new String(toParse, startPosition, count), Ppos, true);
+
−                break;
+
−            case Types.CLOB:
+
−                ((MonetClob[]) columnArray)[lineNumber] = new MonetClob(toParse, startPosition, count);
+
−                break;
+
−            case Types.BLOB:
+
−                ((MonetBlob[]) columnArray)[lineNumber] = new MonetBlob(BinaryBlobConverter(toParse, startPosition, count));
+
−                break;
+
−            case Types.LONGVARBINARY:
+
−                ((byte[][]) columnArray)[lineNumber] = BinaryBlobConverter(toParse, startPosition, count);
+
−                break;
+
−            default:
+
−                throw new ProtocolException("Unknown JDBC mapping!");
+
−        }
+
−    }
+
−
+
−    /**
+
−     * Maps MonetDB's null values with their respective Java representation. For the primitive types, we will map them
+
−     * to their minimum values, while for objects we just map into null pointers.
+
−     *
+
−     * @param lineNumber The row line number on the DataBlock to insert the tuple
+
−     * @param columnArray The column array where the value will be appended
+
−     * @param jDBCMapping The JDBC mapping of the value
+
−     */
+
−    private static void SetNullValue(int lineNumber, Object columnArray, int jDBCMapping) {
+
−        switch (jDBCMapping) {
+
−            case Types.BOOLEAN:
+
−            case Types.TINYINT:
+
−                ((byte[]) columnArray)[lineNumber] = Byte.MIN_VALUE;
+
−                break;
+
−            case Types.SMALLINT:
+
−                ((short[]) columnArray)[lineNumber] = Short.MIN_VALUE;
+
−                break;
+
−            case Types.INTEGER:
+
−                ((int[]) columnArray)[lineNumber] = Integer.MIN_VALUE;
+
−                break;
+
−            case Types.BIGINT:
+
−                ((long[]) columnArray)[lineNumber] = Long.MIN_VALUE;
+
−                break;
+
−            case Types.REAL:
+
−                ((float[]) columnArray)[lineNumber] = Float.MIN_VALUE;
+
−                break;
+
−            case Types.DOUBLE:
+
−                ((double[]) columnArray)[lineNumber] = Double.MIN_VALUE;
+
−                break;
+
−            default:
+
−                ((Object[]) columnArray)[lineNumber] = null;
+
−        }
+
−    }
+
−}