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Java example source code file (BucketIterator.java)

This example Java source code file (BucketIterator.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bucketiterator, illegalstateexception, indeterminate, inputstream, list, objectlisting, override, s3downloader, string, unsupportedoperationexception, util

The BucketIterator.java Java example source code

/*
 *
 *  * Copyright 2015 Skymind,Inc.
 *  *
 *  *    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 org.deeplearning4j.aws.s3.reader;

import java.io.InputStream;
import java.util.Iterator;
import java.util.List;

import com.amazonaws.services.s3.model.ObjectListing;
import com.amazonaws.services.s3.model.S3ObjectSummary;
/**
 * Iterator over individual S3 bucket
 * @author Adam Gibson
 *
 */
public class BucketIterator implements Iterator<InputStream> {

	private S3Downloader s3;
	private String bucket;
	private ObjectListing currList;
	private List<S3ObjectSummary> currObjects;
	private int currObject;




	public BucketIterator(String bucket) {
		this(bucket,null);

	}


	public BucketIterator(String bucket,S3Downloader s3) {
		this.bucket = bucket;

		if(s3 == null)
			this.s3 = new S3Downloader();
        else
            this.s3 = s3;
		currList = s3.listObjects(bucket);
		currObjects = currList.getObjectSummaries();

	}



	@Override
	public boolean hasNext() {
	    return currObject < currObjects.size();
	}

	@Override
	public InputStream next() {
		if(currObject < currObjects.size()) {
			InputStream ret = s3.objectForKey(bucket, currObjects.get(currObject).getKey());
			currObject++;
			return ret;
		}
		else if(currList.isTruncated()) {
			currList = s3.nextList(currList);
			currObjects = currList.getObjectSummaries();
			currObject = 0;

			InputStream ret = s3.objectForKey(bucket, currObjects.get(currObject).getKey());

			currObject++;
			return ret;
		}


		throw new IllegalStateException("Indeterminate state");
	}

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


}

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