src/org/apache/pig/backend/hadoop/executionengine/spark/converter/IteratorTransform.java

/*
 * 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.pig.backend.hadoop.executionengine.spark.converter;

import java.util.Iterator;

abstract class IteratorTransform<IN, OUT> implements Iterator<OUT> {
    private Iterator<IN> delegate;

    public IteratorTransform(Iterator<IN> delegate) {
        super();
        this.delegate = delegate;
    }

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

    @Override
    public OUT next() {
        return transform(delegate.next());
    }

    abstract protected OUT transform(IN next);

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

}