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Jenetics - Java Genetic Algorithm Library
/*
* Java Genetic Algorithm Library (jenetics-3.1.0).
* Copyright (c) 2007-2015 Franz Wilhelmstötter
*
* 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.
*
* Author:
* Franz Wilhelmstötter ([email protected])
*/
package org.jenetics.util;
import static org.jenetics.internal.util.jaxb.adapterFor;
import static org.jenetics.internal.util.jaxb.context;
import static org.jenetics.internal.util.jaxb.marshal;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.nio.file.Path;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.adapters.XmlAdapter;
/**
* Class for object serialization. The following example shows how to write and
* reload a given population.
*
* {@code
* // Creating result population.
* EvolutionResult result = stream
* .collect(toBestEvolutionResult());
*
* // Writing the population to disk.
* final File file = new File("population.xml");
* IO.jaxb.write(result.getPopulation(), file);
*
* // Reading the population from disk.
* Population population =
* (Population)IO.jaxb.read(file);
* EvolutionStream stream = Engine
* .build(ff, gtf)
* .stream(population, 1);
* }
*
* @author Franz Wilhelmstötter
* @since 1.0
* @version 2.0
*/
public abstract class IO {
protected IO() {
}
/**
* JAXB for XML serialization.
*/
public static final IO jaxb = new IO() {
@Override
public void write(final Object object, final OutputStream out)
throws IOException
{
try {
final Marshaller marshaller = context().createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(marshal(object), out);
} catch (Exception e) {
throw new IOException(e);
}
}
@Override
public T read(final Class type, final InputStream in)
throws IOException
{
try {
final Unmarshaller unmarshaller = context().createUnmarshaller();
//final XMLInputFactory factory = XMLInputFactory.newInstance();
//final XMLStreamReader reader = factory.createXMLStreamReader(in);
//try {
final Object object = unmarshaller.unmarshal(in);
final XmlAdapter adapter = adapterFor(object);
if (adapter != null) {
return type.cast(adapter.unmarshal(object));
} else {
return type.cast(object);
}
//} finally {
// reader.close();
//}
} catch (Exception e) {
throw new IOException(e);
}
}
};
/**
* IO implementation for "native" Java serialization.
*/
public static final IO object = new IO() {
@Override
public void write(final Object object, final OutputStream out)
throws IOException
{
final ObjectOutputStream oout = new ObjectOutputStream(out);
oout.writeObject(object);
out.flush();
}
@Override
public T read(final Class type, final InputStream in)
throws IOException
{
final ObjectInputStream oin = new ObjectInputStream(in);
try {
return type.cast(oin.readObject());
} catch (ClassNotFoundException | ClassCastException e) {
throw new IOException(e);
}
}
};
/**
* Write the (serializable) object to the given path.
*
* @param object the object to serialize.
* @param path the path to write the object to.
* @throws NullPointerException if one of the arguments is {@code null}.
* @throws IOException if the object could not be serialized.
*/
public void write(final Object object, final String path)
throws IOException
{
write(object, new File(path));
}
/**
* Write the (serializable) object to the given path.
*
* @param object the object to serialize.
* @param path the path to write the object to.
* @throws NullPointerException if one of the arguments is {@code null}.
* @throws IOException if the object could not be serialized.
*/
public void write(final Object object, final Path path)
throws IOException
{
write(object, path.toFile());
}
/**
* Write the (serializable) object to the given file.
*
* @param object the object to serialize.
* @param file the file to write the object to.
* @throws NullPointerException if one of the arguments is {@code null}.
* @throws IOException if the object could not be serialized.
*/
public void write(final Object object, final File file)
throws IOException
{
try (final FileOutputStream out = new FileOutputStream(file)) {
write(object, out);
}
}
/**
* Write the (serializable) object to the given output stream.
*
* @param object the object to serialize.
* @param out the output stream to write the object to.
* @throws NullPointerException if one of the arguments is {@code null}.
* @throws IOException if the object could not be serialized.
*/
public abstract void write(final Object object, final OutputStream out)
throws IOException;
/**
* Reads an object from the given file.
*
* @param the type of the read object
* @param path the path to read from.
* @param type the type of the read object.
* @return the de-serialized object.
* @throws NullPointerException if the input stream {@code in} is {@code null}.
* @throws IOException if the object could not be read.
*/
public T read(final Class type, final String path)
throws IOException
{
try (final FileInputStream in = new FileInputStream(new File(path))) {
return read(type, in);
}
}
/**
* Reads an object from the given file.
*
* @param path the path to read from.
* @return the de-serialized object.
* @throws NullPointerException if the input stream {@code in} is {@code null}.
* @throws IOException if the object could not be read.
*/
public Object read(final String path) throws IOException {
return read(Object.class, path);
}
/**
* Reads an object from the given file.
*
* @param the type of the read object
* @param path the path to read from.
* @param type the type of the read object.
* @return the de-serialized object.
* @throws NullPointerException if the input stream {@code in} is {@code null}.
* @throws IOException if the object could not be read.
*/
public T read(final Class type, final Path path)
throws IOException
{
try (final FileInputStream in = new FileInputStream(path.toFile())) {
return read(type, in);
}
}
/**
* Reads an object from the given file.
*
* @param path the path to read from.
* @return the de-serialized object.
* @throws NullPointerException if the input stream {@code in} is {@code null}.
* @throws IOException if the object could not be read.
*/
public Object read(final Path path) throws IOException {
return read(Object.class, path);
}
/**
* Reads an object from the given file.
*
* @param the type of the read object
* @param file the file to read from.
* @param type the type of the read object.
* @return the de-serialized object.
* @throws NullPointerException if the input stream {@code in} is {@code null}.
* @throws IOException if the object could not be read.
*/
public T read(final Class type, final File file)
throws IOException
{
try (final FileInputStream in = new FileInputStream(file)) {
return read(type, in);
}
}
/**
* Reads an object from the given file.
*
* @param file the file to read from.
* @return the de-serialized object.
* @throws NullPointerException if the input stream {@code in} is {@code null}.
* @throws IOException if the object could not be read.
*/
public Object read(final File file) throws IOException {
return read(Object.class, file);
}
/**
* Reads an object from the given input stream.
*
* @param the type of the read object
* @param in the input stream to read from.
* @param type the type of the read object.
* @return the de-serialized object.
* @throws NullPointerException if the input stream {@code in} is {@code null}.
* @throws IOException if the object could not be read.
*/
public abstract T read(final Class type, final InputStream in)
throws IOException;
/**
* Reads an object from the given input stream.
*
* @param in the input stream to read from.
* @return the de-serialized object.
* @throws NullPointerException if the input stream {@code in} is {@code null}.
* @throws IOException if the object could not be read.
*/
public Object read(final InputStream in) throws IOException {
return read(Object.class, in);
}
}
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