make it possible to ignore columns using the csv ingestor

pdb-ui/src/test/java/org/lucares/pdbui/LongPair.java

@@ -0,0 +1,72 @@
+package org.lucares.pdbui;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+import org.lucares.collections.LongList;
+
+final class LongPair implements Comparable<LongPair> {
+	private final long a, b;
+
+	public LongPair(final long a, final long b) {
+		super();
+		this.a = a;
+		this.b = b;
+	}
+
+	public static List<LongPair> fromLongList(final LongList longList) {
+		final List<LongPair> result = new ArrayList<>();
+		for (int i = 0; i < longList.size(); i += 2) {
+
+			result.add(new LongPair(longList.get(i), longList.get(i + 1)));
+
+		}
+		Collections.sort(result);
+		return result;
+	}
+
+	public long getA() {
+		return a;
+	}
+
+	public long getB() {
+		return b;
+	}
+
+	@Override
+	public String toString() {
+		return a + "," + b;
+	}
+
+	@Override
+	public int compareTo(final LongPair o) {
+		return Comparator.comparing(LongPair::getA).thenComparing(LongPair::getB).compare(this, o);
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + (int) (a ^ (a >>> 32));
+		result = prime * result + (int) (b ^ (b >>> 32));
+		return result;
+	}
+
+	@Override
+	public boolean equals(final Object obj) {
+		if (this == obj)
+			return true;
+		if (obj == null)
+			return false;
+		if (getClass() != obj.getClass())
+			return false;
+		final LongPair other = (LongPair) obj;
+		if (a != other.a)
+			return false;
+		if (b != other.b)
+			return false;
+		return true;
+	}
+}