org.caleydo.view.bicluster.sorting.ConcatedList.java Source code

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Here is the source code for org.caleydo.view.bicluster.sorting.ConcatedList.java

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/*******************************************************************************
 * Caleydo - Visualization for Molecular Biology - http://caleydo.org
 * Copyright (c) The Caleydo Team. All rights reserved.
 * Licensed under the new BSD license, available at http://caleydo.org/license
 *******************************************************************************/
package org.caleydo.view.bicluster.sorting;

import java.util.AbstractList;
import java.util.List;
import java.util.RandomAccess;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterators;
import com.google.common.collect.UnmodifiableIterator;

/**
 * concat to immutable list to a new one
 * 
 * @author Samuel Gratzl
 * 
 */
public class ConcatedList<T> extends AbstractList<T> implements RandomAccess {
    private final ImmutableList<T> a;
    private final ImmutableList<T> b;

    private ConcatedList(ImmutableList<T> a, ImmutableList<T> b) {
        this.a = a;
        this.b = b;
    }

    public static <T> List<T> concat(ImmutableList<T> a, ImmutableList<T> b) {
        if (a.isEmpty())
            return b;
        if (b.isEmpty())
            return a;
        return new ConcatedList<>(a, b);
    }

    @Override
    public int size() {
        return a.size() + b.size();
    }

    @Override
    public T get(int index) {
        if (index < 0)
            throw new IndexOutOfBoundsException();
        if (index >= size())
            throw new IndexOutOfBoundsException();
        if (index >= a.size())
            return b.get(index - a.size());
        return a.get(index);
    }

    @Override
    public UnmodifiableIterator<T> iterator() {
        return Iterators.unmodifiableIterator(Iterators.concat(a.iterator(), b.iterator()));
    }
}