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/*
* Copyright (C) 2007 The Guava Authors
*
* 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.
*/
package com.google.common.io;
import com.google.common.annotations.Beta;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import java.io.Flushable;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Utility methods for working with {@link Flushable} objects.
*
* @author Michael Lancaster
* @since 1.0
*/
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public final class Flushables {
private static final Logger logger = Logger.getLogger(Flushables.class.getName());
private Flushables() {}
/**
* Flush a {@link Flushable}, with control over whether an {@code IOException} may be thrown.
*
* <p>If {@code swallowIOException} is true, then we don't rethrow {@code IOException}, but merely
* log it.
*
* @param flushable the {@code Flushable} object to be flushed.
* @param swallowIOException if true, don't propagate IO exceptions thrown by the {@code flush}
* method
* @throws IOException if {@code swallowIOException} is false and {@link Flushable#flush} throws
* an {@code IOException}.
* @see Closeables#close
*/
public static void flush(Flushable flushable, boolean swallowIOException) throws IOException {
try {
flushable.flush();
} catch (IOException e) {
if (swallowIOException) {
logger.log(Level.WARNING, "IOException thrown while flushing Flushable.", e);
} else {
throw e;
}
}
}
/**
* Equivalent to calling {@code flush(flushable, true)}, but with no {@code IOException} in the
* signature.
*
* @param flushable the {@code Flushable} object to be flushed.
*/
@Beta
public static void flushQuietly(Flushable flushable) {
try {
flush(flushable, true);
} catch (IOException e) {
logger.log(Level.SEVERE, "IOException should not have been thrown.", e);
}
}
}
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