/* Copyright 2010, Google Inc. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of Google Inc. nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package com.google.refine.browsing.util; import java.util.Calendar; import java.util.Collection; import java.util.Date; import java.util.Properties; import com.google.refine.browsing.RecordVisitor; import com.google.refine.browsing.RowVisitor; import com.google.refine.expr.ExpressionUtils; import com.google.refine.model.Project; import com.google.refine.model.Record; import com.google.refine.model.Row; /** * Visit matched rows or records and slot them into bins based on the date computed * from a given expression. */ public class ExpressionTimeValueBinner implements RowVisitor, RecordVisitor { /* * Configuration */ final protected RowEvaluable _rowEvaluable; final protected TimeBinIndex _index; // base bins /* * Computed results */ final public int[] bins; public int timeCount; public int nonTimeCount; public int blankCount; public int errorCount; /* * Scratchpad variables */ protected boolean hasError; protected boolean hasBlank; protected boolean hasTime; protected boolean hasNonTime; public ExpressionTimeValueBinner(RowEvaluable rowEvaluable, TimeBinIndex index) { _rowEvaluable = rowEvaluable; _index = index; bins = new int[_index.getBins().length]; } @Override public void start(Project project) { // nothing to do } @Override public void end(Project project) { // nothing to do } @Override public boolean visit(Project project, int rowIndex, Row row) { resetFlags(); Properties bindings = ExpressionUtils.createBindings(project); processRow(project, rowIndex, row, bindings); updateCounts(); return false; } @Override public boolean visit(Project project, Record record) { resetFlags(); Properties bindings = ExpressionUtils.createBindings(project); for (int r = record.fromRowIndex; r < record.toRowIndex; r++) { processRow(project, r, project.rows.get(r), bindings); } updateCounts(); return false; } protected void resetFlags() { hasError = false; hasBlank = false; hasTime = false; hasNonTime = false; } protected void updateCounts() { if (hasError) { errorCount++; } if (hasBlank) { blankCount++; } if (hasTime) { timeCount++; } if (hasNonTime) { nonTimeCount++; } } protected void processRow(Project project, int rowIndex, Row row, Properties bindings) { Object value = _rowEvaluable.eval(project, rowIndex, row, bindings); if (value != null) { if (value.getClass().isArray()) { Object[] a = (Object[]) value; for (Object v : a) { processValue(v); } return; } else if (value instanceof Collection<?>) { for (Object v : ExpressionUtils.toObjectCollection(value)) { processValue(v); } return; } // else, fall through } processValue(value); } protected void processValue(Object value) { if (ExpressionUtils.isError(value)) { hasError = true; } else if (ExpressionUtils.isNonBlankData(value)) { if (value instanceof Calendar) { value = ((Calendar) value).getTime(); } if (value instanceof Date) { long t = ((Date) value).getTime(); hasTime = true; int bin = (int) Math.floor((double) (t - _index.getMin()) / (double) _index.getStep()); if (bin >= 0 && bin < bins.length) { // as a precaution bins[bin]++; } } else { hasNonTime = true; } } else { hasBlank = true; } } }