RemoveOnlyCollection.java

/*
 * #%L
 * Gravia :: Resource
 * %%
 * Copyright (C) 2010 - 2014 JBoss by Red Hat
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */
package org.jboss.gravia.utils;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;

/**
 * A Collection that does not allow add operations.
 *
 * @author thomas.diesler@jboss.com
 * @since 21-Mar-2010
 */
@SuppressWarnings("rawtypes")
public final class RemoveOnlyCollection<T> implements Collection<T> {

    Collection<T> delegate;

    @SafeVarargs
    public RemoveOnlyCollection(T... elements) {
        if (elements == null)
            throw new IllegalArgumentException("Null elements");
        this.delegate = new ArrayList<T>(Arrays.asList(elements));
    }

    public RemoveOnlyCollection(Collection<T> delegate) {
        if (delegate == null)
            throw new IllegalArgumentException("Null delegate");
        this.delegate = delegate;
    }

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

    @Override
    public boolean isEmpty() {
        return delegate.isEmpty();
    }

    @Override
    public boolean contains(Object o) {
        return delegate.contains(o);
    }

    @Override
    public Iterator<T> iterator() {
        return delegate.iterator();
    }

    @Override
    public Object[] toArray() {
        return delegate.toArray();
    }

    @Override
    @SuppressWarnings("unchecked")
    public Object[] toArray(Object[] a) {
        return delegate.toArray(a);
    }

    @Override
    public boolean add(Object e) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean remove(Object o) {
        return delegate.remove(o);
    }

    @Override
    public boolean containsAll(Collection c) {
        return delegate.containsAll(c);
    }

    @Override
    public boolean addAll(Collection c) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean removeAll(Collection c) {
        return delegate.removeAll(c);
    }

    @Override
    public boolean retainAll(Collection c) {
        return delegate.removeAll(c);
    }

    @Override
    public void clear() {
        delegate.clear();
    }

    @Override
    public int hashCode() {
        return delegate.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        return delegate.equals(obj);
    }

    @Override
    public String toString() {
        return delegate.toString();
    }
}