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CodecFunction.java
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CodecFunction.java
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/*
* Copyright 2019 Sabirov Evgenii (sabirov.e@gmail.com)
*
* 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
*
* https://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 com.github.sabirove.codec.function;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.function.Function;
/**
* Bidirectional serialization function for doing IO operations
* on target values against the provided sources.
* <p>
* Standard implementations can be obtained via {@link CodecFunctions} factory.
*
* @param <T> target value type
* @implNote implementations are expected to throw {@link IOException} as is without any wrapping.
*/
public abstract class CodecFunction<T> {
/**
* @throws IOException when fails to write to the stream
* @implNote shouldn't flush or close the underlying stream
*/
public abstract void write(T value, OutputStream out) throws IOException;
/**
* @throws IOException when fails to read from the stream
* @throws EOFException when trying to read and the end of the input stream reached
* @implNote shouldn't close the underlying stream
*/
public abstract T read(InputStream in) throws IOException;
/**
* Adapt this function to another target type by using a pair of specified type converters.
*/
public final <V> CodecFunction<V> adapt(Function<T, V> from, Function<V, T> to) {
final CodecFunction<T> it = this;
return new CodecFunction<V>() {
@Override
public void write(V value, OutputStream out) throws IOException {
it.write(to.apply(value), out);
}
@Override
public V read(InputStream in) throws IOException {
return from.apply(it.read(in));
}
};
}
}