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Dataset.java
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Dataset.java
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/*
* The MIT License
*
* Copyright 2016 Thibault Debatty.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package info.debatty.java.datasets;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.util.LinkedList;
/**
*
* @author Thibault Debatty
* @param <T> The type of items in this dataset
*/
public abstract class Dataset<T> implements Iterable<T>, Serializable {
/**
* Return all items of the dataset (except if it's an infinite dataset).
* @return
*/
public LinkedList<T> getAll() {
LinkedList<T> list = new LinkedList<T>();
for (T item : this) {
list.add(item);
}
return list;
}
/**
* Get the first items of the dataset.
* @param count
* @return
*/
public final LinkedList<T> get(int count) {
LinkedList<T> list = new LinkedList<T>();
for (T item : this) {
list.add(item);
if (list.size() == count) {
return list;
}
}
return list;
}
/**
* Serialize and save this dataset to an output stream (might be a file).
* The java Dataset class gets serialized and saved, not the actual
* elements of the dataset.
* @param out
* @throws IOException if output file does not exist
*/
public final void save(final OutputStream out) throws IOException {
ObjectOutputStream object_out = new ObjectOutputStream(out);
object_out.writeObject(this);
}
/**
* Load a saved dataset.
*
* @param input
* @return
* @throws IOException if file does not exist
* @throws ClassNotFoundException if class is not recognized
*/
public static Dataset load(final InputStream input)
throws IOException, ClassNotFoundException {
ObjectInputStream object_input = new ObjectInputStream(input);
Dataset dataset = (Dataset) object_input.readObject();
return dataset;
}
}