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Various utility classes to ease development of plugins

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package kg.apc.charting.rows;

import kg.apc.charting.AbstractGraphRow;
import kg.apc.charting.elements.GraphPanelChartExactElement;
import kg.apc.charting.AbstractGraphPanelChartElement;

import java.util.Iterator;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentSkipListMap;

public class GraphRowExactValues
        extends AbstractGraphRow
        implements Iterator> {
    private ConcurrentSkipListMap values;
    private Iterator> iterator;

    public GraphRowExactValues() {
        super();
        values = new ConcurrentSkipListMap<>();
    }

    @Override
    public void add(long xVal, double yVal) {
        GraphPanelChartExactElement el;
        el = new GraphPanelChartExactElement(xVal, yVal);
        values.put((long) values.size(), el);

        super.add(xVal, yVal);
    }

    @Override
    public Iterator> iterator() {
        iterator = values.entrySet().iterator();
        return this;
    }

    public boolean hasNext() {
        return iterator != null && iterator.hasNext();
    }

    public Entry next() {
        GraphPanelChartExactElement el = (GraphPanelChartExactElement) iterator.next().getValue();
        return new ExactEntry(el.getX(), el);
    }

    public void remove() {
        throw new UnsupportedOperationException("Not supported yet.");
    }

    private static class ExactEntry
            implements Entry {
        private long key;
        private final AbstractGraphPanelChartElement value;

        public ExactEntry(long aKey, AbstractGraphPanelChartElement aValue) {
            key = aKey;
            value = aValue;
        }

        public Long getKey() {
            return key;
        }

        public AbstractGraphPanelChartElement getValue() {
            return value;
        }

        public AbstractGraphPanelChartElement setValue(AbstractGraphPanelChartElement value) {
            throw new UnsupportedOperationException("Not supported yet.");
        }
    }

    @Override
    public int size() {
        return values.size();
    }

    @Override
    public AbstractGraphPanelChartElement getElement(long value) {
        AbstractGraphPanelChartElement ret = null;
        Iterator> it = values.entrySet().iterator();

        while (it.hasNext() && ret == null) {
            GraphPanelChartExactElement el = (GraphPanelChartExactElement) it.next().getValue();
            if (el.getX() == value) {
                ret = el;
            }
        }

        return ret;
    }
}