io.druid.java.util.common.guava.Yielders Maven / Gradle / Ivy
/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.java.util.common.guava;
import com.google.common.base.Throwables;
import java.io.IOException;
/**
*/
public class Yielders
{
public static Yielder each(final Sequence sequence)
{
return sequence.toYielder(
null,
new YieldingAccumulator()
{
@Override
public T accumulate(T accumulated, T in)
{
yield();
return in;
}
}
);
}
public static Yielder done(final T finalVal, final AutoCloseable closeable)
{
return new Yielder()
{
@Override
public T get()
{
return finalVal;
}
@Override
public Yielder next(T initValue)
{
return null;
}
@Override
public boolean isDone()
{
return true;
}
@Override
public void close() throws IOException
{
if (closeable != null) {
try {
closeable.close();
}
catch (Exception e) {
Throwables.propagateIfInstanceOf(e, IOException.class);
throw Throwables.propagate(e);
}
}
}
};
}
}