diff -r 7e08730da258 -r 4a1864c3e867 java/sql-dk/src/main/java/info/globalcode/sql/dk/formatting/TabularPrefetchingFormatter.java
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/java/sql-dk/src/main/java/info/globalcode/sql/dk/formatting/TabularPrefetchingFormatter.java Mon Mar 04 20:15:24 2019 +0100
@@ -0,0 +1,119 @@
+/**
+ * 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 .
+ */
+package info.globalcode.sql.dk.formatting;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ *
+ * Prefetches whole result set and computes column widths. Whole table is flushed at once in
+ * {@linkplain #writeEndResultSet()}.
+ *
+ *
+ *
+ * Long values will not overflow the cells, but whole result set must be loaded into the memory.
+ *
+ *
+ * @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 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 currentResultSet) {
+ }
+
+}