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@88:  * the Free Software Foundation, either version 3 of the License, or
franta-hg@88:  * (at your option) any later version.
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 <http://www.gnu.org/licenses/>.
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:  * <p>
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:  * </p>
franta-hg@88:  *
franta-hg@155:  * <p>
franta-hg@155:  * Long values will not overflow the cells, but whole result set must be loaded into the memory.
franta-hg@155:  * </p>
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<Object[]> 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<Object[]> currentResultSet) {
franta-hg@224: 	}
franta-hg@224: 
franta-hg@88: }