io.datarouter.scanner.SteppingScanner Maven / Gradle / Ivy

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/**
 * Copyright © 2009 HotPads ([email protected])
 *
 * 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.
 */
package io.datarouter.scanner;

public class SteppingScanner extends BaseLinkedScanner{

	private final long stepSize;

	private long counter;

	public SteppingScanner(Scanner input, long stepSize){
		super(input);
		this.stepSize = stepSize;
		this.counter = 0;
	}

	@Override
	public boolean advanceInternal(){
		while(input.advance()){
			long modulo = counter % stepSize;
			++counter;
			if(modulo == 0){
				current = input.current();
				return true;
			}
		}
		return false;
	}

}