/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.beam.sdk.coders;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.beam.sdk.values.TypeDescriptor;
/**
* A {@link Coder} that encodes {@code Integer Integers} as the ASCII bytes of
* their textual, decimal, representation.
*/
public class TextualIntegerCoder extends AtomicCoder<Integer> {
public static TextualIntegerCoder of() {
return new TextualIntegerCoder();
}
/////////////////////////////////////////////////////////////////////////////
private static final TypeDescriptor<Integer> TYPE_DESCRIPTOR = new TypeDescriptor<Integer>() {};
protected TextualIntegerCoder() {}
@Override
public void encode(Integer value, OutputStream outStream)
throws IOException, CoderException {
encode(value, outStream, Context.NESTED);
}
@Override
public void encode(Integer value, OutputStream outStream, Context context)
throws IOException, CoderException {
if (value == null) {
throw new CoderException("cannot encode a null Integer");
}
String textualValue = value.toString();
StringUtf8Coder.of().encode(textualValue, outStream, context);
}
@Override
public Integer decode(InputStream inStream) throws IOException, CoderException {
return decode(inStream, Context.NESTED);
}
@Override
public Integer decode(InputStream inStream, Context context)
throws IOException, CoderException {
String textualValue = StringUtf8Coder.of().decode(inStream, context);
try {
return Integer.valueOf(textualValue);
} catch (NumberFormatException exn) {
throw new CoderException("error when decoding a textual integer", exn);
}
}
@Override
public void verifyDeterministic() {
StringUtf8Coder.of().verifyDeterministic();
}
@Override
public TypeDescriptor<Integer> getEncodedTypeDescriptor() {
return TYPE_DESCRIPTOR;
}
@Override
protected long getEncodedElementByteSize(Integer value) throws Exception {
if (value == null) {
throw new CoderException("cannot encode a null Integer");
}
String textualValue = value.toString();
return StringUtf8Coder.of().getEncodedElementByteSize(textualValue);
}
}