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DecoderStream.java
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DecoderStream.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;
import java.io.*;
import com.github.sabirove.codec.function.CodecFunction;
import com.github.sabirove.codec.util.CodecUtil;
/**
* {@link InputStream} wrapper allowing to read decoded values from the underlying stream.
*/
public final class DecoderStream<T> implements AutoCloseable {
private final InputStream is;
private final CodecFunction<T> function;
DecoderStream(InputStream is, CodecFunction<T> function) {
this.is = is;
this.function = function;
}
/**
* Read and decode the value of the target type from the underlying stream.
*
* @return decoded value
* @throws UncheckedIOException wrapping the original {@link IOException} when IO operation fails
*/
public T read() {
try {
return function.read(is);
} catch (IOException e) {
return CodecUtil.throwUnchecked(e);
}
}
/**
* Shortcut for {@link #read()} and then {@link #close()}.
*
* @throws UncheckedIOException wrapping the original {@link IOException} when IO operation fails
*/
public T readAndClose() {
try (DecoderStream<T> ds = this) {
return ds.read();
}
}
/**
* Closes the underlying {@link InputStream} as per the {@link AutoCloseable} contract.
* @throws UncheckedIOException wrapping the original {@link IOException} when IO operation fails
*/
@Override
public void close() {
try {
is.close();
} catch (IOException e) {
CodecUtil.throwUnchecked(e);
}
}
}