First commit of DateTimeInterval class

src/main/java/no/nibio/vips/util/DateTimeInterval.java

+/*
+ * Copyright (c) 2018 NIBIO <http://www.nibio.no/>. 
+ * 
+ * This file is part of VIPSCommon.
+ * VIPSCommon is free software: you can redistribute it and/or modify
+ * it under the terms of the NIBIO Open Source License as published by 
+ * NIBIO, either version 1 of the License, or (at your option) any
+ * later version.
+ * 
+ * VIPSCommon is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * NIBIO Open Source License for more details.
+ * 
+ * You should have received a copy of the NIBIO Open Source License
+ * along with VIPSCommon.  If not, see <http://www.nibio.no/licenses/>.
+ * 
+ */
+
+package no.nibio.vips.util;
+
+import java.util.Date;
+import java.util.List;
+import java.util.OptionalLong;
+
+/**
+ * Util for simple treatment of DateTime interval/period
+ * ...meaning a period that starts with a date and ends with a date
+ * @copyright 2018 <a href="http://www.nibio.no/">NIBIO</a>
+ * @author Tor-Einar Skog <tor-einar.skog@nibio.no>
+ */
+public class DateTimeInterval {
+
+    private Date start, end;
+    public DateTimeInterval(Date start, Date end){
+        this.start = start;
+        this.end = end;
+    }
+    
+    public Boolean isDateInInterval(Date aDate){
+        return aDate.compareTo(this.start) >= 0 && aDate.compareTo(this.end) <= 0;
+    }
+    
+    public Boolean isDateAfterInterval(Date aDate){
+        return aDate.compareTo(this.end) >= 0;
+    }
+    
+    public Boolean isDateBeforeInterval(Date aDate){
+        return aDate.compareTo(this.start) <= 0;
+    }
+
+    /**
+     * Given a list of periods, finds the last end date of all periods
+     * @param intervals the set of periods to compare
+     * @return 
+     */
+    public static Date getLastEndDate(List<DateTimeInterval> intervals)
+    {
+        OptionalLong max = intervals.stream().mapToLong(i->i.getEnd().getTime()).max();
+        return max.isPresent() ? new Date(max.getAsLong()) : null;
+    }
+    
+    /**
+     * Given a list of periods, finds the last end date of all periods
+     * @param intervals the set of periods to compare
+     * @return 
+     */
+    public static Date getFirstStartDate(List<DateTimeInterval> intervals)
+    {
+        OptionalLong min = intervals.stream().mapToLong(i->i.getStart().getTime()).min();
+        return min.isPresent() ? new Date(min.getAsLong()) : null;
+    }
+    
+    /**
+     * @return the start
+     */
+    public Date getStart() {
+        return start;
+    }
+
+    /**
+     * @param start the start to set
+     */
+    public void setStart(Date start) {
+        this.start = start;
+    }
+
+    /**
+     * @return the end
+     */
+    public Date getEnd() {
+        return end;
+    }
+
+    /**
+     * @param end the end to set
+     */
+    public void setEnd(Date end) {
+        this.end = end;
+    }
+}