+
−/*
+
− * 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 2016 MonetDB B.V.
+
− */
+
−
+
−package nl.cwi.monetdb.embedded.resultset;
+
−
+
−import nl.cwi.monetdb.embedded.env.MonetDBEmbeddedException;
+
−
+
−import java.lang.reflect.Array;
+
−import java.util.Arrays;
+
−import java.util.ListIterator;
+
−
+
−/**
+
− * A MonetDB column converted to an array of Java objects.
+
− *
+
− * @param <T> The Java class of the mapped MonetDB column
+
− * @author <a href="mailto:pedro.ferreira@monetdbsolutions.com">Pedro Ferreira</a>
+
− */
+
−public class QueryResultSetObjectColumn<T> extends AbstractQueryResultSetColumn<T[]> implements Iterable<T> {
+
−
+
−    /**
+
−     * A null pointer returning method.
+
−     *
+
−     * @return A null pointer
+
−     */
+
−    public static Object GetObjectNullConstant() { return null; }
+
−
+
−    /**
+
−     * Checks if the Object value is null or not.
+
−     *
+
−     * @param value The value to evaluate
+
−     * @return If the Object value is null or not.
+
−     */
+
−    public static boolean CheckObjectIsNull(Object value) { return value == null; }
+
−
+
−    /**
+
−     * Array with the retrieved values.
+
−     */
+
−    private final T[] values;
+
−
+
−    @SuppressWarnings("unchecked")
+
−    public QueryResultSetObjectColumn(String columnType, long tablePointer, int resultSetIndex, String columnName,
+
−                                      int columnDigits, int columnScale, int numberOfRows) {
+
−        super(columnType, tablePointer, resultSetIndex, columnName, columnDigits, columnScale, numberOfRows);
+
−        this.values = (T[]) Array.newInstance(this.mapping.getJavaClass(), numberOfRows);
+
−    }
+
−
+
−    @Override
+
−    @SuppressWarnings("unchecked")
+
−    protected void fetchMoreData(int startIndex, int endIndex) throws MonetDBEmbeddedException {
+
−        T[] values = this.fetchValuesInternal(this.tablePointer, this.resultSetIndex,
+
−                (Class<T>) this.mapping.getJavaClass(), this.mapping.ordinal(), startIndex, endIndex);
+
−        System.arraycopy(values, 0, this.values, startIndex, values.length);
+
−    }
+
−
+
−    @Override
+
−    @SuppressWarnings("unchecked")
+
−    protected T[] storeNewDataAndGetResult(int startIndex, int numberOfRowsToRetrieve) {
+
−        T[] result = (T[]) Array.newInstance(this.mapping.getJavaClass(), numberOfRowsToRetrieve);
+
−        System.arraycopy(this.values, startIndex, result, 0, numberOfRowsToRetrieve);
+
−        return result;
+
−    }
+
−
+
−    @Override
+
−    protected boolean[] checkIfIndexesAreNullImplementation(T[] values, boolean[] res) throws MonetDBEmbeddedException {
+
−        for(int i = 0 ; i < values.length ; i++) {
+
−            res[i] = (values[i] == null);
+
−        }
+
−        return res;
+
−    }
+
−
+
−    @Override
+
−    protected T[] mapValuesToObjectArrayImplementation(T[] values) throws MonetDBEmbeddedException {
+
−        return values;
+
−    }
+
−
+
−    @Override
+
−    public ListIterator<T> iterator() {
+
−        try {
+
−            return Arrays.asList(this.fetchAllColumnValues()).listIterator();
+
−        } catch (Exception ex) {
+
−            return null;
+
−        }
+
−    }
+
−
+
−    /**
+
−     * Internal implementation to fetch values from the column.
+
−     */
+
−    private native T[] fetchValuesInternal(long tablePointer, int resultSetIndex, Class<T> jClass, int javaIndex,
+
−                                           int startIndex, int endIndex) throws MonetDBEmbeddedException;
+
−}