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/*
* 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.csv;
import com.facebook.presto.common.type.Type;
import com.facebook.presto.decoder.DecoderColumnHandle;
import com.facebook.presto.decoder.FieldValueProvider;
import com.facebook.presto.spi.PrestoException;
import com.google.common.collect.ImmutableList;
import io.airlift.slice.Slice;
import static com.facebook.presto.common.type.BigintType.BIGINT;
import static com.facebook.presto.common.type.BooleanType.BOOLEAN;
import static com.facebook.presto.common.type.DoubleType.DOUBLE;
import static com.facebook.presto.common.type.IntegerType.INTEGER;
import static com.facebook.presto.common.type.SmallintType.SMALLINT;
import static com.facebook.presto.common.type.TinyintType.TINYINT;
import static com.facebook.presto.common.type.Varchars.isVarcharType;
import static com.facebook.presto.common.type.Varchars.truncateToLength;
import static com.facebook.presto.decoder.DecoderErrorCode.DECODER_CONVERSION_NOT_SUPPORTED;
import static com.facebook.presto.decoder.FieldValueProviders.nullValueProvider;
import static com.facebook.presto.spi.StandardErrorCode.GENERIC_USER_ERROR;
import static com.google.common.base.Preconditions.checkArgument;
import static io.airlift.slice.Slices.utf8Slice;
import static java.lang.String.format;
import static java.util.Objects.requireNonNull;
public class CsvColumnDecoder
{
private final String columnName;
private final Type columnType;
private final int columnIndex;
public CsvColumnDecoder(DecoderColumnHandle columnHandle)
{
try {
requireNonNull(columnHandle, "columnHandle is null");
checkArgument(!columnHandle.isInternal(), "unexpected internal column '%s'", columnHandle.getName());
columnName = columnHandle.getName();
checkArgument(columnHandle.getFormatHint() == null, "unexpected format hint '%s' defined for column '%s'", columnHandle.getFormatHint(), columnName);
checkArgument(columnHandle.getDataFormat() == null, "unexpected data format '%s' defined for column '%s'", columnHandle.getDataFormat(), columnName);
columnType = columnHandle.getType();
checkArgument(columnHandle.getMapping() != null, "mapping not defined for column '%s'", columnName);
try {
columnIndex = Integer.parseInt(columnHandle.getMapping());
}
catch (NumberFormatException e) {
throw new IllegalArgumentException(format("invalid mapping '%s' for column '%s'", columnHandle.getMapping(), columnName));
}
checkArgument(columnIndex >= 0, "invalid mapping '%s' for column '%s'", columnHandle.getMapping(), columnName);
checkArgument(isSupportedType(columnType), "Unsupported column type '%s' for column '%s'", columnType.getDisplayName(), columnName);
}
catch (IllegalArgumentException e) {
throw new PrestoException(GENERIC_USER_ERROR, e);
}
}
private static boolean isSupportedType(Type type)
{
if (isVarcharType(type)) {
return true;
}
if (ImmutableList.of(BIGINT, INTEGER, SMALLINT, TINYINT, BOOLEAN, DOUBLE).contains(type)) {
return true;
}
return false;
}
public FieldValueProvider decodeField(String[] tokens)
{
if (columnIndex >= tokens.length) {
return nullValueProvider();
}
else {
return new FieldValueProvider()
{
@Override
public boolean isNull()
{
return tokens[columnIndex].isEmpty();
}
@SuppressWarnings("SimplifiableConditionalExpression")
@Override
public boolean getBoolean()
{
try {
return Boolean.parseBoolean(tokens[columnIndex].trim());
}
catch (NumberFormatException e) {
throw new PrestoException(DECODER_CONVERSION_NOT_SUPPORTED, format("could not parse value '%s' as '%s' for column '%s'", tokens[columnIndex].trim(), columnType, columnName));
}
}
@Override
public long getLong()
{
try {
return Long.parseLong(tokens[columnIndex].trim());
}
catch (NumberFormatException e) {
throw new PrestoException(DECODER_CONVERSION_NOT_SUPPORTED, format("could not parse value '%s' as '%s' for column '%s'", tokens[columnIndex].trim(), columnType, columnName));
}
}
@Override
public double getDouble()
{
try {
return Double.parseDouble(tokens[columnIndex].trim());
}
catch (NumberFormatException e) {
throw new PrestoException(DECODER_CONVERSION_NOT_SUPPORTED, format("could not parse value '%s' as '%s' for column '%s'", tokens[columnIndex].trim(), columnType, columnName));
}
}
@Override
public Slice getSlice()
{
return truncateToLength(utf8Slice(tokens[columnIndex]), columnType);
}
};
}
}
}
