/*
* 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.facebook.presto.decoder.dummy;
import com.facebook.presto.decoder.DecoderColumnHandle;
import com.facebook.presto.decoder.FieldDecoder;
import com.facebook.presto.decoder.FieldValueProvider;
import com.facebook.presto.spi.PrestoException;
import com.google.common.collect.ImmutableSet;
import io.airlift.slice.Slice;
import java.util.Set;
import static com.facebook.presto.decoder.DecoderErrorCode.DECODER_CONVERSION_NOT_SUPPORTED;
import static java.lang.String.format;
import static java.util.Objects.requireNonNull;
/**
* Default 'decoder' for the dummy format. Can not decode anything. This is intentional.
*/
public class DummyFieldDecoder
implements FieldDecoder<Void>
{
@Override
public Set<Class<?>> getJavaTypes()
{
return ImmutableSet.of(boolean.class, long.class, double.class, Slice.class);
}
@Override
public final String getRowDecoderName()
{
return DummyRowDecoder.NAME;
}
@Override
public String getFieldDecoderName()
{
return FieldDecoder.DEFAULT_FIELD_DECODER_NAME;
}
@Override
public FieldValueProvider decode(Void value, DecoderColumnHandle columnHandle)
{
requireNonNull(columnHandle, "columnHandle is null");
return new FieldValueProvider()
{
@Override
public boolean accept(DecoderColumnHandle handle)
{
return false;
}
@Override
public boolean isNull()
{
throw new PrestoException(DECODER_CONVERSION_NOT_SUPPORTED, "is null check not supported");
}
};
}
@Override
public String toString()
{
return format("FieldDecoder[%s/%s]", getRowDecoderName(), getFieldDecoderName());
}
}