/*
* 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.spi.type;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.PrestoException;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.block.BlockBuilder;
import io.airlift.slice.Slice;
import io.airlift.slice.Slices;
import java.util.Objects;
import static com.facebook.presto.spi.StandardErrorCode.INVALID_FUNCTION_ARGUMENT;
import static com.facebook.presto.spi.type.Chars.compareChars;
import static java.lang.String.format;
import static java.util.Collections.singletonList;
public final class CharType
extends AbstractVariableWidthType
{
public static final int MAX_LENGTH = 65_536;
private final int length;
public static CharType createCharType(long length)
{
return new CharType(length);
}
private CharType(long length)
{
super(
new TypeSignature(
StandardTypes.CHAR,
singletonList(TypeSignatureParameter.of(length))),
Slice.class);
if (length < 0 || length > MAX_LENGTH) {
throw new PrestoException(INVALID_FUNCTION_ARGUMENT, format("CHAR length scale must be in range [0, %s]", MAX_LENGTH));
}
this.length = (int) length;
}
public int getLength()
{
return length;
}
@Override
public boolean isComparable()
{
return true;
}
@Override
public boolean isOrderable()
{
return true;
}
@Override
public Object getObjectValue(ConnectorSession session, Block block, int position)
{
if (block.isNull(position)) {
return null;
}
StringBuilder builder = new StringBuilder(length);
String value = block.getSlice(position, 0, block.getSliceLength(position)).toStringUtf8();
builder.append(value);
for (int i = value.length(); i < length; i++) {
builder.append(' ');
}
return builder.toString();
}
@Override
public boolean equalTo(Block leftBlock, int leftPosition, Block rightBlock, int rightPosition)
{
int leftLength = leftBlock.getSliceLength(leftPosition);
int rightLength = rightBlock.getSliceLength(rightPosition);
if (leftLength != rightLength) {
return false;
}
return leftBlock.equals(leftPosition, 0, rightBlock, rightPosition, 0, leftLength);
}
@Override
public long hash(Block block, int position)
{
return block.hash(position, 0, block.getSliceLength(position));
}
@Override
public int compareTo(Block leftBlock, int leftPosition, Block rightBlock, int rightPosition)
{
Slice leftSlice = leftBlock.getSlice(leftPosition, 0, leftBlock.getSliceLength(leftPosition));
Slice rightSlice = rightBlock.getSlice(rightPosition, 0, rightBlock.getSliceLength(rightPosition));
return compareChars(leftSlice, rightSlice);
}
@Override
public void appendTo(Block block, int position, BlockBuilder blockBuilder)
{
if (block.isNull(position)) {
blockBuilder.appendNull();
}
else {
block.writeBytesTo(position, 0, block.getSliceLength(position), blockBuilder);
blockBuilder.closeEntry();
}
}
@Override
public Slice getSlice(Block block, int position)
{
return block.getSlice(position, 0, block.getSliceLength(position));
}
public void writeString(BlockBuilder blockBuilder, String value)
{
writeSlice(blockBuilder, Slices.utf8Slice(value));
}
@Override
public void writeSlice(BlockBuilder blockBuilder, Slice value)
{
writeSlice(blockBuilder, value, 0, value.length());
}
@Override
public void writeSlice(BlockBuilder blockBuilder, Slice value, int offset, int length)
{
blockBuilder.writeBytes(value, offset, length).closeEntry();
}
@Override
public boolean equals(Object o)
{
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
CharType other = (CharType) o;
return Objects.equals(this.length, other.length);
}
@Override
public int hashCode()
{
return Objects.hash(length);
}
@Override
public String getDisplayName()
{
return getTypeSignature().toString();
}
@Override
public String toString()
{
return getDisplayName();
}
}