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package com.google.refine.browsing.util;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collection;
import java.util.Date;
import java.util.List;
import java.util.Properties;
import com.google.refine.expr.ExpressionUtils;
import com.google.refine.model.Project;
import com.google.refine.model.Row;
/**
* A utility class for computing the base bins that form the base histograms of
* temporal range facets. It evaluates an expression on all the rows of a project to
* get temporal values, determines how many bins to distribute those values in, and
* bins the rows accordingly.
*
* This class processes all rows rather than just the filtered rows because it
* needs to compute the base bins of a temporal range facet, which remain unchanged
* as the user interacts with the facet.
*/
abstract public class TimeBinIndex {
protected int _totalValueCount;
protected int _timeValueCount;
protected long _min;
protected long _max;
protected long _step;
protected int[] _bins;
protected int _timeRowCount;
protected int _nonTimeRowCount;
protected int _blankRowCount;
protected int _errorRowCount;
protected boolean _hasError = false;
protected boolean _hasNonTime = false;
protected boolean _hasTime = false;
protected boolean _hasBlank = false;
protected long[] steps = {
1, // msec
1000, // sec
1000*60, // min
1000*60*60, // hour
1000*60*60*24, // day
1000*60*60*24*7, // week
1000l*2629746l, // month (average Gregorian year / 12)
1000l*31556952l, // year (average Gregorian year)
1000l*31556952l*10l, // decade
1000l*31556952l*100l, // century
1000l*31556952l*1000l, // millennium
};
abstract protected void iterate(Project project, RowEvaluable rowEvaluable, List<Long> allValues);
public TimeBinIndex(Project project, RowEvaluable rowEvaluable) {
_min = Long.MAX_VALUE;
_max = Long.MIN_VALUE;
List<Long> allValues = new ArrayList<Long>();
iterate(project, rowEvaluable, allValues);
_timeValueCount = allValues.size();
if (_min >= _max) {
_step = 1;
_min = Math.min(_min, _max);
_max = _step;
_bins = new int[1];
return;
}
long diff = _max - _min;
for (long step : steps) {
_step = step;
if (diff / _step <= 100) {
break;
}
}
_bins = new int[(int) (diff / _step) + 1];
for (long d : allValues) {
int bin = (int) Math.max((d - _min) / _step,0);
_bins[bin]++;
}
}
public boolean isTemporal() {
return _timeValueCount > _totalValueCount / 2;
}
public long getMin() {
return _min;
}
public long getMax() {
return _max;
}
public long getStep() {
return _step;
}
public int[] getBins() {
return _bins;
}
public int getTimeRowCount() {
return _timeRowCount;
}
public int getNonTimeRowCount() {
return _nonTimeRowCount;
}
public int getBlankRowCount() {
return _blankRowCount;
}
public int getErrorRowCount() {
return _errorRowCount;
}
protected void processRow(
Project project,
RowEvaluable rowEvaluable,
List<Long> allValues,
int rowIndex,
Row row,
Properties bindings
) {
Object value = rowEvaluable.eval(project, rowIndex, row, bindings);
if (ExpressionUtils.isError(value)) {
_hasError = true;
} else if (ExpressionUtils.isNonBlankData(value)) {
if (value.getClass().isArray()) {
Object[] a = (Object[]) value;
for (Object v : a) {
_totalValueCount++;
if (ExpressionUtils.isError(v)) {
_hasError = true;
} else if (ExpressionUtils.isNonBlankData(v)) {
if (v instanceof Calendar) {
v = ((Calendar) v).getTime();
}
if (v instanceof Date) {
_hasTime = true;
processValue(((Date) v).getTime(), allValues);
} else {
_hasNonTime = true;
}
} else {
_hasBlank = true;
}
}
} else if (value instanceof Collection<?>) {
for (Object v : ExpressionUtils.toObjectCollection(value)) {
_totalValueCount++;
if (ExpressionUtils.isError(v)) {
_hasError = true;
} else if (ExpressionUtils.isNonBlankData(v)) {
if (v instanceof Calendar) {
v = ((Calendar) v).getTime();
}
if (v instanceof Date) {
_hasTime = true;
processValue(((Date) v).getTime(), allValues);
} else {
_hasNonTime = true;
}
} else {
_hasBlank = true;
}
}
} else {
_totalValueCount++;
if (value instanceof Calendar) {
value = ((Calendar) value).getTime();
}
if (value instanceof Date) {
_hasTime = true;
processValue(((Date) value).getTime(), allValues);
} else {
_hasNonTime = true;
}
}
} else {
_hasBlank = true;
}
}
protected void preprocessing() {
_hasBlank = false;
_hasError = false;
_hasNonTime = false;
_hasTime = false;
}
protected void postprocessing() {
if (_hasError) {
_errorRowCount++;
}
if (_hasBlank) {
_blankRowCount++;
}
if (_hasTime) {
_timeRowCount++;
}
if (_hasNonTime) {
_nonTimeRowCount++;
}
}
protected void processValue(long v, List<Long> allValues) {
_min = Math.min(_min, v);
_max = Math.max(_max, v);
allValues.add(v);
}
}