+
−package nl.cwi.monetdb.mcl.responses;
+
−
+
−import nl.cwi.monetdb.mcl.protocol.AbstractProtocol;
+
−import nl.cwi.monetdb.mcl.protocol.ProtocolException;
+
−import nl.cwi.monetdb.mcl.protocol.ServerResponses;
+
−
+
−import java.sql.SQLException;
+
−import java.sql.Types;
+
−
+
−/**
+
− * The DataBlockResponse is tabular data belonging to a
+
− * ResultSetResponse.  Tabular data from the server typically looks
+
− * like:
+
− * <pre>
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− * [ "value",	56	]
+
− * </pre>
+
− * where each column is separated by ",\t" and each tuple surrounded
+
− * by brackets ("[" and "]").  A DataBlockResponse object holds the
+
− * raw data as read from the server, in a parsed manner, ready for
+
− * easy retrieval.
+
− *
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− * This object is not intended to be queried by multiple threads
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− * synchronously. It is designed to work for one thread retrieving
+
− * rows from it.  When multiple threads will retrieve rows from this
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− * object, it is possible for threads to get the same data.
+
− */
+
−public class DataBlockResponse implements IIncompleteResponse {
+
−
+
−    /** The array to keep the data in */
+
−    private Object[] data;
+
−    /** The counter which keeps the current position in the data array */
+
−    private int pos;
+
−    /** The connection protocol to parse the tuple lines */
+
−    private final AbstractProtocol protocol;
+
−    /** The JdbcSQLTypes mapping */
+
−    private final int[] jdbcSQLTypes;
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−    /** A mapping of null values of the current Row */
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−    private boolean[][] nullMappings;
+
−    /** A 'pointer' to the current line */
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−    private int blockLine;
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−
+
−    /**
+
−     * Constructs a DataBlockResponse object.
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−     *
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−     * @param rowcount the number of rows
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−     * @param columncount the number of columns
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−     * @param forward whether this is a forward only result
+
−     */
+
−    DataBlockResponse(int rowcount, int columncount, boolean forward, AbstractProtocol protocol, int[] JdbcSQLTypes) {
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−        this.pos = -1;
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−        this.data = new Object[columncount];
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−        this.nullMappings = new boolean[rowcount][columncount];
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−        this.protocol = protocol;
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−        this.jdbcSQLTypes = JdbcSQLTypes;
+
−    }
+
−
+
−    /**
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−     * addLine adds a String of data to this object's data array. Note that an IndexOutOfBoundsException can be thrown
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−     * when an attempt is made to add more than the original construction size specified.
+
−     *
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−     * @param line the header line as String
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−     * @param response the line type according to the MAPI protocol
+
−     * @throws ProtocolException If the result line is not expected
+
−     */
+
−    @Override
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−    public void addLine(ServerResponses response, Object line) throws ProtocolException {
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−        if (response != ServerResponses.RESULT)
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−            throw new ProtocolException("protocol violation: unexpected line in data block: " + line.toString());
+
−
+
−        if(this.pos == -1) { //if it's the first line, initialize the matrix
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−            int numberOfColumns = this.data.length, numberOfRows = this.nullMappings.length;
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−            for (int i = 0 ; i < numberOfColumns ; i++) {
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−                switch (this.jdbcSQLTypes[i]) {
+
−                    case Types.BOOLEAN:
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−                        this.data[i] = new boolean[numberOfRows];
+
−                        break;
+
−                    case Types.TINYINT:
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−                        this.data[i] = new byte[numberOfRows];
+
−                        break;
+
−                    case Types.SMALLINT:
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−                        this.data[i] = new short[numberOfRows];
+
−                        break;
+
−                    case Types.INTEGER:
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−                        this.data[i] = new int[numberOfRows];
+
−                        break;
+
−                    case Types.BIGINT:
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−                        this.data[i] = new long[numberOfRows];
+
−                        break;
+
−                    case Types.REAL:
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−                        this.data[i] = new float[numberOfRows];
+
−                        break;
+
−                    case Types.DOUBLE:
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−                        this.data[i] = new double[numberOfRows];
+
−                        break;
+
−                    default:
+
−                        this.data[i] = new Object[numberOfRows];
+
−                }
+
−            }
+
−        }
+
−
+
−        // add to the backing array
+
−        int nextPos = ++this.pos;
+
−        this.protocol.parseTupleLine(nextPos, line, this.jdbcSQLTypes, this.data, this.nullMappings[nextPos]);
+
−    }
+
−
+
−    /**
+
−     * Returns whether this Response expects more lines to be added to it.
+
−     *
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−     * @return true if a next line should be added, false otherwise
+
−     */
+
−    @Override
+
−    public boolean wantsMore() {
+
−        // remember: pos is the value already stored
+
−        return (this.pos + 1) < this.nullMappings.length;
+
−    }
+
−
+
−    /**
+
−     * Indicates that no more header lines will be added to this Response implementation. In most cases this is a
+
−     * redundant operation because the data array is full. However... it can happen that this is NOT the case!
+
−     *
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−     * @throws SQLException if not all rows are filled
+
−     */
+
−    @Override
+
−    public void complete() throws SQLException {
+
−        if ((this.pos + 1) != this.nullMappings.length) {
+
−            throw new SQLException("Inconsistent state detected! Current block capacity: " + this.nullMappings.length +
+
−                    ", block usage: " + (this.pos + 1) + ". Did MonetDB send what it promised to?", "M0M10");
+
−        }
+
−    }
+
−
+
−    /**
+
−     * Instructs the Response implementation to close and do the necessary clean up procedures.
+
−     */
+
−    @Override
+
−    public void close() {
+
−        // feed all rows to the garbage collector
+
−        int numberOfColumns = this.data.length;
+
−        for (int i = 0; i < numberOfColumns; i++) {
+
−            data[i] = null;
+
−            nullMappings[i] = null;
+
−        }
+
−        data = null;
+
−        nullMappings = null;
+
−    }
+
−
+
−    /* Methods to be called after the block construction has been completed */
+
−
+
−    void setBlockLine(int blockLine) {
+
−        this.blockLine = blockLine;
+
−    }
+
−
+
−    public void setData(Object[] data) { /* For VirtualResultSet :( */
+
−        this.data = data;
+
−    }
+
−
+
−    public Object[] getData() { /* For VirtualResultSet :( */
+
−        return this.data;
+
−    }
+
−
+
−    public boolean checkValueIsNull(int column) {
+
−        return this.nullMappings[this.blockLine][column];
+
−    }
+
−
+
−    public boolean getBooleanValue(int column) {
+
−        return ((boolean[]) this.data[column])[this.blockLine];
+
−    }
+
−
+
−    public byte getByteValue(int column) {
+
−        return ((byte[]) this.data[column])[this.blockLine];
+
−    }
+
−
+
−    public short getShortValue(int column) {
+
−        return ((short[]) this.data[column])[this.blockLine];
+
−    }
+
−
+
−    public int getIntValue(int column) {
+
−        return ((int[]) this.data[column])[this.blockLine];
+
−    }
+
−
+
−    public long getLongValue(int column) {
+
−        return ((long[]) this.data[column])[this.blockLine];
+
−    }
+
−
+
−    public float getFloatValue(int column) {
+
−        return ((float[]) this.data[column])[this.blockLine];
+
−    }
+
−
+
−    public double getDoubleValue(int column) {
+
−        return ((double[]) this.data[column])[this.blockLine];
+
−    }
+
−
+
−    public Object getObjectValue(int column) {
+
−        return ((Object[]) this.data[column])[this.blockLine];
+
−    }
+
−
+
−    public String getValueAsString(int column) {
+
−        switch (this.jdbcSQLTypes[column]) {
+
−            case Types.BOOLEAN:
+
−                return Boolean.toString(((boolean[]) this.data[column])[this.blockLine]);
+
−            case Types.TINYINT:
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−                return Byte.toString(((byte[]) this.data[column])[this.blockLine]);
+
−            case Types.SMALLINT:
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−                return Short.toString(((short[]) this.data[column])[this.blockLine]);
+
−            case Types.INTEGER:
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−                return Integer.toString(((int[]) this.data[column])[this.blockLine]);
+
−            case Types.BIGINT:
+
−                return Long.toString(((long[]) this.data[column])[this.blockLine]);
+
−            case Types.REAL:
+
−                return Float.toString(((float[]) this.data[column])[this.blockLine]);
+
−            case Types.DOUBLE:
+
−                return Double.toString(((double[]) this.data[column])[this.blockLine]);
+
−            case Types.CHAR:
+
−            case Types.VARCHAR:
+
−            case Types.CLOB:
+
−            case Types.OTHER:
+
−                return (String) ((Object[]) this.data[column])[this.blockLine];
+
−            default:
+
−                return ((Object[]) this.data[column])[this.blockLine].toString();
+
−        }
+
−    }
+
−
+
−    public Object getValueAsObject(int column) {
+
−        switch (this.jdbcSQLTypes[column]) {
+
−            case Types.BOOLEAN:
+
−                return ((boolean[]) this.data[column])[this.blockLine];
+
−            case Types.TINYINT:
+
−                return (((byte[]) this.data[column])[this.blockLine]);
+
−            case Types.SMALLINT:
+
−                return (((short[]) this.data[column])[this.blockLine]);
+
−            case Types.INTEGER:
+
−                return (((int[]) this.data[column])[this.blockLine]);
+
−            case Types.BIGINT:
+
−                return (((long[]) this.data[column])[this.blockLine]);
+
−            case Types.REAL:
+
−                return (((float[]) this.data[column])[this.blockLine]);
+
−            case Types.DOUBLE:
+
−                return (((double[]) this.data[column])[this.blockLine]);
+
−            default:
+
−                return ((Object[]) this.data[column])[this.blockLine];
+
−        }
+
−    }
+
−}