franta-hg@88: /**
franta-hg@88: * SQL-DK
franta-hg@88: * Copyright © 2013 František Kučera (frantovo.cz)
franta-hg@88: *
franta-hg@88: * This program is free software: you can redistribute it and/or modify
franta-hg@88: * it under the terms of the GNU General Public License as published by
franta-hg@250: * the Free Software Foundation, version 3 of the License.
franta-hg@88: *
franta-hg@88: * This program is distributed in the hope that it will be useful,
franta-hg@88: * but WITHOUT ANY WARRANTY; without even the implied warranty of
franta-hg@88: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
franta-hg@88: * GNU General Public License for more details.
franta-hg@88: *
franta-hg@88: * You should have received a copy of the GNU General Public License
franta-hg@88: * along with this program. If not, see .
franta-hg@88: */
franta-hg@88: package info.globalcode.sql.dk.formatting;
franta-hg@88:
franta-hg@88: import java.util.ArrayList;
franta-hg@88: import java.util.List;
franta-hg@88:
franta-hg@88: /**
franta-hg@155: *
franta-hg@88: * Prefetches whole result set and computes column widths. Whole table is flushed at once in
franta-hg@88: * {@linkplain #writeEndResultSet()}.
franta-hg@155: *
franta-hg@88: *
franta-hg@155: *
franta-hg@155: * Long values will not overflow the cells, but whole result set must be loaded into the memory.
franta-hg@155: *
franta-hg@88: *
franta-hg@88: * @author Ing. František Kučera (frantovo.cz)
franta-hg@88: */
franta-hg@88: public class TabularPrefetchingFormatter extends TabularFormatter {
franta-hg@88:
franta-hg@88: public static final String NAME = "tabular-prefetching"; // bash-completion:formatter
franta-hg@88: private ColumnsHeader currentHeader;
franta-hg@88: private List currentResultSet;
franta-hg@88: private Object[] currentRow;
franta-hg@88: private int currentColumnsCount;
franta-hg@88: private boolean prefetchDone = false;
franta-hg@88:
franta-hg@88: public TabularPrefetchingFormatter(FormatterContext formatterContext) {
franta-hg@88: super(formatterContext);
franta-hg@88: }
franta-hg@88:
franta-hg@88: @Override
franta-hg@88: protected int getCurrentColumnsCount() {
franta-hg@88: if (prefetchDone) {
franta-hg@88: return super.getCurrentColumnsCount();
franta-hg@88: } else {
franta-hg@88: return currentColumnsCount;
franta-hg@88: }
franta-hg@88: }
franta-hg@88:
franta-hg@88: @Override
franta-hg@142: public void writeStartResultSet(ColumnsHeader header) {
franta-hg@88: currentResultSet = new ArrayList<>();
franta-hg@88: currentHeader = header;
franta-hg@88: initColumnWidths(header.getColumnCount());
franta-hg@88: }
franta-hg@88:
franta-hg@88: @Override
franta-hg@88: public void writeStartRow() {
franta-hg@88: currentRow = new Object[currentHeader.getColumnCount()];
franta-hg@88: currentResultSet.add(currentRow);
franta-hg@88: currentColumnsCount = 0;
franta-hg@88: }
franta-hg@88:
franta-hg@88: @Override
franta-hg@88: public void writeColumnValue(Object value) {
franta-hg@88: currentRow[currentColumnsCount] = value;
franta-hg@88: currentColumnsCount++;
franta-hg@88: String textRepresentation = toString(value);
franta-hg@88: /** TODO: count only printable characters (currently not an issue) */
franta-hg@88: updateColumnWidth(currentColumnsCount, textRepresentation.length());
franta-hg@88: }
franta-hg@88:
franta-hg@88: @Override
franta-hg@88: public void writeEndRow() {
franta-hg@88: // do nothing
franta-hg@88: }
franta-hg@88:
franta-hg@88: @Override
franta-hg@88: public void writeEndResultSet() {
franta-hg@88: prefetchDone = true;
franta-hg@88:
franta-hg@224: postprocessPrefetchedResultSet(currentHeader, currentResultSet);
franta-hg@224:
franta-hg@142: super.writeStartResultSet(currentHeader);
franta-hg@88:
franta-hg@88: for (Object[] row : currentResultSet) {
franta-hg@88: super.writeStartRow();
franta-hg@88: for (Object cell : row) {
franta-hg@88: super.writeColumnValue(cell);
franta-hg@88: }
franta-hg@88: super.writeEndRow();
franta-hg@88: }
franta-hg@88:
franta-hg@88: currentColumnsCount = 0;
franta-hg@88: currentHeader = null;
franta-hg@88: currentRow = null;
franta-hg@88: currentResultSet = null;
franta-hg@88: super.writeEndResultSet();
franta-hg@88: prefetchDone = false;
franta-hg@88: }
franta-hg@224:
franta-hg@224: /**
franta-hg@224: * Optional post-processing – override in sub-classes if needed.
franta-hg@224: * Don't forget to {@linkplain #updateColumnWidth(int, int)}
franta-hg@224: *
franta-hg@224: * @param currentHeader
franta-hg@224: * @param currentResultSet
franta-hg@224: */
franta-hg@224: protected void postprocessPrefetchedResultSet(ColumnsHeader currentHeader, List currentResultSet) {
franta-hg@224: }
franta-hg@224:
franta-hg@88: }