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/**
* Copyright 2011 - 2014 Xeiam LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.xeiam.xchart.internal.chartpart;
import java.text.SimpleDateFormat;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;
import java.util.concurrent.TimeUnit;
import com.xeiam.xchart.StyleManager;
/**
* @author timmolter
*/
public class DateFormatter {
public static final long MILLIS_SCALE = TimeUnit.MILLISECONDS.toMillis(1L);
public static final long SEC_SCALE = TimeUnit.SECONDS.toMillis(1L);
public static final long MIN_SCALE = TimeUnit.MINUTES.toMillis(1L);
public static final long HOUR_SCALE = TimeUnit.HOURS.toMillis(1L);
public static final long DAY_SCALE = TimeUnit.DAYS.toMillis(1L);
public static final long MONTH_SCALE = TimeUnit.DAYS.toMillis(1L) * 31;
public static final long YEAR_SCALE = TimeUnit.DAYS.toMillis(1L) * 365;
private Map validTickStepsMap;
private final StyleManager styleManager;
/**
* Constructor
*/
public DateFormatter(StyleManager styleManager) {
this.styleManager = styleManager;
validTickStepsMap = new TreeMap();
validTickStepsMap.put(MILLIS_SCALE, new int[] { 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000 });
validTickStepsMap.put(SEC_SCALE, new int[] { 1, 2, 5, 10, 15, 20, 30, 60 });
validTickStepsMap.put(MIN_SCALE, new int[] { 1, 2, 3, 5, 10, 15, 20, 30, 60 });
validTickStepsMap.put(HOUR_SCALE, new int[] { 1, 2, 4, 6, 12, 24 });
validTickStepsMap.put(DAY_SCALE, new int[] { 1, 2, 3, 5, 10, 15, 31 });
validTickStepsMap.put(MONTH_SCALE, new int[] { 1, 2, 3, 4, 6, 12 });
validTickStepsMap.put(YEAR_SCALE, new int[] { 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000 });
}
/**
* @param gridStepHint
* @return
*/
public long getTimeUnit(long gridStepHint) {
for (Entry entry : validTickStepsMap.entrySet()) {
long groupMagnitude = entry.getKey();
int[] steps = entry.getValue();
long validTickStepMagnitude = (long) ((groupMagnitude * steps[steps.length - 2] + groupMagnitude * steps[steps.length - 1]) / 2.0);
if (gridStepHint < validTickStepMagnitude) {
return groupMagnitude;
}
}
return YEAR_SCALE;
}
/**
* Format a date value
*
* @param value
* @param min
* @param max
* @return
*/
public String formatDate(double value, long timeUnit) {
String datePattern;
if (styleManager.getDatePattern() == null) {
// intelligently set date pattern if none is given
if (timeUnit == MILLIS_SCALE) {
datePattern = "ss.SSS";
}
else if (timeUnit == SEC_SCALE) {
datePattern = "mm:ss";
}
else if (timeUnit == MIN_SCALE) {
datePattern = "HH:mm";
}
else if (timeUnit == HOUR_SCALE) {
datePattern = "HH:mm";
}
else if (timeUnit == DAY_SCALE) {
datePattern = "MM-dd";
}
else if (timeUnit == MONTH_SCALE) {
datePattern = "yyyy-MM";
}
else {
datePattern = "yyyy";
}
}
else {
datePattern = styleManager.getDatePattern();
}
SimpleDateFormat simpleDateformat = new SimpleDateFormat(datePattern, styleManager.getLocale());
simpleDateformat.setTimeZone(styleManager.getTimezone());
simpleDateformat.applyPattern(datePattern);
return simpleDateformat.format(value);
}
Map getValidTickStepsMap() {
return validTickStepsMap;
}
}
