org.dstadler.commons.collections.UnsupportedCollection Maven / Gradle / Ivy

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Common utilities I find useful in many of my projects.
There is a newer version: 1.3.5
package org.dstadler.commons.collections;

import java.util.Collection;
import java.util.Iterator;
import java.util.Spliterator;
import java.util.function.Consumer;
import java.util.function.IntFunction;
import java.util.function.Predicate;
import java.util.stream.Stream;

/**
 * A simple abstract {@link java.util.Collection} implementation which throws {@link UnsupportedOperationException}
 * for every method.
 *
 * This can be used to implement implementations which only provide a
 * subset of the functionality of List
 */
public abstract class UnsupportedCollection implements Collection {
    @Override
    public int size() {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public boolean isEmpty() {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public boolean contains(Object o) {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public Iterator iterator() {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public Object[] toArray() {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    // Only overrides on Java 11: @Override
    public  T[] toArray(IntFunction generator) {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public  T[] toArray(T[] a) {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public boolean add(E e) {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public boolean remove(Object o) {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public boolean containsAll(Collection c) {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public boolean addAll(Collection c) {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public boolean removeAll(Collection c) {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public boolean retainAll(Collection c) {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public void clear() {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public boolean removeIf(Predicate filter) {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public Spliterator spliterator() {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public Stream stream() {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public Stream parallelStream() {
        throw new UnsupportedOperationException("This operation is not supported");
    }

    @Override
    public void  forEach(Consumer action) {
        throw new UnsupportedOperationException("This operation is not supported");
    }
}