metridoc.camel.impl.iterator.BatchIterator.groovy Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of metridoc-camel-plugin Show documentation

The newest version!

/*
 * Copyright 2010 Trustees of the University of Pennsylvania Licensed under the
 * Educational Community 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.osedu.org/licenses/ECL-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 metridoc.camel.impl.iterator

import metridoc.utils.Assert

/**
 * Created by IntelliJ IDEA.
 * User: tbarker
 * Date: 9/4/11
 * Time: 4:33 PM
 *
 * We have migrated all iterator operations to the iterator-plugin module
 *
 * @deprecated
 */
class BatchIterator implements Iterator{
    /**
     * the wrapped iterator
     */
    Iterator iterator
    int batchSize

    BatchIterator(Iterator iterator, int batchSize) {
        Assert.notNull(iterator, "iterator cannot be null")
        Assert.isTrue(batchSize > 0, "batch size must be greater than 0")
        this.iterator = iterator
        this.batchSize = batchSize
    }

    boolean hasNext() {
        return iterator.hasNext()
    }

    List next() {

        def result = []
        for(int i = 0; i < batchSize; i++) {
            if(hasNext()) {
                result.add(iterator.next())
            } else {
                break
            }
        }

        if(!result) {
            throw new NoSuchElementException("No more elements left in BatchIterator")
        }

        return result
    }

    void remove() {
        throw new UnsupportedOperationException("remove is not supported in BatchIterator")
    }
}