java/sql-dk/src/info/globalcode/sql/dk/formatting/TabularPrefetchingFormatter.java
branchv_0
changeset 238 4a1864c3e867
parent 237 7e08730da258
child 239 39e6c2ad3571
--- a/java/sql-dk/src/info/globalcode/sql/dk/formatting/TabularPrefetchingFormatter.java	Mon Mar 04 17:06:42 2019 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,119 +0,0 @@
-/**
- * SQL-DK
- * Copyright © 2013 František Kučera (frantovo.cz)
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-package info.globalcode.sql.dk.formatting;
-
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * <p>
- * Prefetches whole result set and computes column widths. Whole table is flushed at once in
- * {@linkplain #writeEndResultSet()}.
- * </p>
- *
- * <p>
- * Long values will not overflow the cells, but whole result set must be loaded into the memory.
- * </p>
- *
- * @author Ing. František Kučera (frantovo.cz)
- */
-public class TabularPrefetchingFormatter extends TabularFormatter {
-
-	public static final String NAME = "tabular-prefetching"; // bash-completion:formatter
-	private ColumnsHeader currentHeader;
-	private List<Object[]> currentResultSet;
-	private Object[] currentRow;
-	private int currentColumnsCount;
-	private boolean prefetchDone = false;
-
-	public TabularPrefetchingFormatter(FormatterContext formatterContext) {
-		super(formatterContext);
-	}
-
-	@Override
-	protected int getCurrentColumnsCount() {
-		if (prefetchDone) {
-			return super.getCurrentColumnsCount();
-		} else {
-			return currentColumnsCount;
-		}
-	}
-
-	@Override
-	public void writeStartResultSet(ColumnsHeader header) {
-		currentResultSet = new ArrayList<>();
-		currentHeader = header;
-		initColumnWidths(header.getColumnCount());
-	}
-
-	@Override
-	public void writeStartRow() {
-		currentRow = new Object[currentHeader.getColumnCount()];
-		currentResultSet.add(currentRow);
-		currentColumnsCount = 0;
-	}
-
-	@Override
-	public void writeColumnValue(Object value) {
-		currentRow[currentColumnsCount] = value;
-		currentColumnsCount++;
-		String textRepresentation = toString(value);
-		/** TODO: count only printable characters (currently not an issue) */
-		updateColumnWidth(currentColumnsCount, textRepresentation.length());
-	}
-
-	@Override
-	public void writeEndRow() {
-		// do nothing
-	}
-
-	@Override
-	public void writeEndResultSet() {
-		prefetchDone = true;
-
-		postprocessPrefetchedResultSet(currentHeader, currentResultSet);
-
-		super.writeStartResultSet(currentHeader);
-
-		for (Object[] row : currentResultSet) {
-			super.writeStartRow();
-			for (Object cell : row) {
-				super.writeColumnValue(cell);
-			}
-			super.writeEndRow();
-		}
-
-		currentColumnsCount = 0;
-		currentHeader = null;
-		currentRow = null;
-		currentResultSet = null;
-		super.writeEndResultSet();
-		prefetchDone = false;
-	}
-
-	/**
-	 * Optional post-processing – override in sub-classes if needed.
-	 * Don't forget to {@linkplain #updateColumnWidth(int, int)}
-	 *
-	 * @param currentHeader
-	 * @param currentResultSet
-	 */
-	protected void postprocessPrefetchedResultSet(ColumnsHeader currentHeader, List<Object[]> currentResultSet) {
-	}
-
-}