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    • org.apache.chemistry.opencmis.client.runtime.util.EmptyItemIterable Maven / Gradle / Ivy

    /*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
package org.apache.chemistry.opencmis.client.runtime.util;

import java.util.Iterator;
import java.util.NoSuchElementException;

import org.apache.chemistry.opencmis.client.api.ItemIterable;

/**
 * An empty item iterable.
 */
public class EmptyItemIterable implements ItemIterable {

    public static final EmptyItemIterable INSTANCE = new EmptyItemIterable();

    @SuppressWarnings("unchecked")
    public static  EmptyItemIterable instance() {
        return (EmptyItemIterable) INSTANCE;
    }

    @Override
    public ItemIterable skipTo(long position) {
        if (position != 0) {
            throw new IllegalArgumentException(String.valueOf(position));
        }
        return this;
    }

    @Override
    public ItemIterable getPage() {
        return this;
    }

    @Override
    public ItemIterable getPage(int maxNumItems) {
        return this;
    }

    @Override
    @SuppressWarnings("unchecked")
    public Iterator iterator() {
        return (Iterator) EmptyIterator.INSTANCE;
    }

    @Override
    public long getPageNumItems() {
        return 0;
    }

    @Override
    public boolean getHasMoreItems() {
        return false;
    }

    @Override
    public long getTotalNumItems() {
        return 0;
    }

    /**
     * An empty iterator.
     */
    public static class EmptyIterator implements Iterator {
        public static final Iterator INSTANCE = new EmptyIterator();

        @Override
        public boolean hasNext() {
            return false;
        }

        @Override
        public V next() {
            throw new NoSuchElementException();
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }
    }

}
    
    
    
    

    




    
    
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