Mercurial > hg > monetdb-java
view src/main/java/nl/cwi/monetdb/embedded/resultset/QueryResultSetFloatColumn.java @ 82:4231a7f5cdc3 embedded
Added better null values mapping for JDBC embedded connection compatibility. The previous potential bug on boolean columns in now fixed
author | Pedro Ferreira <pedro.ferreira@monetdbsolutions.com> |
---|---|
date | Tue, 27 Dec 2016 17:23:38 +0000 (2016-12-27) |
parents | 86967be24645 |
children |
line wrap: on
line source
/* * 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; /** * A MonetDB column converted to an array of Java float values. * * @author <a href="mailto:pedro.ferreira@monetdbsolutions.com">Pedro Ferreira</a> */ public final class QueryResultSetFloatColumn extends AbstractQueryResultSetColumn<float[]> { /** * Gets MonetDB's float null constant * * @return MonetDB's float null constant */ public static native float GetFloatNullConstant(); /** * Checks if the float value is null or not. * * @param value The value to evaluate * @return If the float value is null or not. */ public static native boolean CheckFloatIsNull(float value); /** * Array with the retrieved values. */ private final float[] values; protected QueryResultSetFloatColumn(String columnType, long tablePointer, int resultSetIndex, String columnName, int columnDigits, int columnScale, int numberOfRows) { super(columnType, tablePointer, resultSetIndex, columnName, columnDigits, columnScale, numberOfRows); if(!this.getMapping().getJavaClass().equals(Float.class)) { throw new ClassCastException("The parameter must be of float type!!"); } this.values = new float[numberOfRows]; } @Override protected void fetchMoreData(int startIndex, int endIndex) throws MonetDBEmbeddedException { this.fetchValuesInternal(this.tablePointer, this.resultSetIndex, startIndex, endIndex, this.values, this.nullValues); } @Override protected float[] storeNewDataAndGetResult(int startIndex, int numberOfRowsToRetrieve) { float[] result = new float[numberOfRowsToRetrieve]; System.arraycopy(this.values, startIndex, result, 0, numberOfRowsToRetrieve); return result; } @Override protected Float[] mapValuesToObjectArrayImplementation(int startIndex, int numberOfRowsToRetrieve) { Float[] res = new Float[numberOfRowsToRetrieve]; int endIndex = startIndex + numberOfRowsToRetrieve; for(int i = startIndex, j = 0 ; i < endIndex ; i++, j++) { res[j] = (this.nullValues[i]) ? null : this.values[i]; } return res; } /** * Internal implementation to fetch values from the column. */ private native void fetchValuesInternal(long tablePointer, int resultSetIndex, int startIndex, int endIndex, float[] values, boolean[] nullValues) throws MonetDBEmbeddedException; }