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TOVAL comprises a set of java classes for common programming issues. It includes utils for arrays, lists, sets and collections for convenient handling and modification, but also support for mathematic definitions concerning logic (clauses + resolution) together with some algorithms for permutations, powersets and resolution. Additionally it contains a number of types for multisets, matrices with object keys and much more.

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package de.invation.code.toval.time;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public abstract class AbstractIntervalList {
	protected List timeIntervals = new ArrayList();
	protected Interval minBorders = new Interval(Long.MIN_VALUE, Long.MAX_VALUE);
	protected Interval maxBorders = null;
	
	public AbstractIntervalList(){}
	
	public AbstractIntervalList(T initialTimeInterval){
		timeIntervals.add(initialTimeInterval);
	}
	
	/**
	 * Returns the size of the interval list, i.e. the number of intervals.
	 * @return The number of intervals in the list.
	 */
	public int size(){
		return timeIntervals.size();
	}
	
	public boolean isEmpty(){
		return timeIntervals.isEmpty();
	}
	
	public List getIntervals(){
		return Collections.unmodifiableList(timeIntervals);
	}
	
	/**
	 * Adds a new time interval to the list of time intervals
	 * and adjusts the minimum and maximum borders.
	 * @param interval The interval to add.
	 */
	public void addTimeInterval(T interval){
		timeIntervals.add(interval);
		minBorders.setStart(Math.max(minBorders.getStart(), interval.getStart()));
		minBorders.setEnd(Math.min(minBorders.getEnd(), interval.getEnd()));
		if(maxBorders == null){
			maxBorders = interval.clone();
		} else {
			maxBorders.setStart(Math.min(maxBorders.getStart(), interval.getStart()));
			maxBorders.setEnd(Math.max(maxBorders.getEnd(), interval.getEnd()));
		}
	}
	
	/**
	 * Checks if the given interval starts within the minimum borders.

	 * If the minimum borders are a and b (atrue if the given interval starts within the minimum borders;

	 * false otherwise.
	 */
	public boolean startsWithinMinBorders(Interval interval){
		return interval.getStart() >= minBorders.getStart() &&
			   interval.getStart() <= minBorders.getEnd();
	}
	
	/**
	 * Checks if the given interval starts within the maximum borders.

	 * If the maximum borders are a and b (atrue if the given interval starts within the maximum borders;

	 * false otherwise.
	 */
	public boolean startsWithinMaxBorders(Interval interval){
		return interval.getStart() >= maxBorders.getStart() &&
			   interval.getStart() <= maxBorders.getEnd();
	}
	
	/**
	 * Checks if the given interval lies within the minimum borders.

	 * If the minimum borders are a and b (atrue if the given interval lies within the minimum borders;

	 * false otherwise.
	 */
	public boolean liesWithinMinBorders(Interval interval){
		return interval.getStart() >= minBorders.getStart() &&
			   interval.getEnd() <= minBorders.getEnd();
	}

	/**
	 * Checks if the given interval lies within the maximum borders.

	 * If the maximum borders are a and b (atrue if the given interval lies within the maximum borders;

	 * false otherwise.
	 */
	public boolean liesWithinMaxBorders(Interval interval){
		return interval.getStart() >= maxBorders.getStart() &&
			   interval.getEnd() <= maxBorders.getEnd();
	}
	
	@Override
	public String toString(){
		return timeIntervals.toString();
	}
}