/*
* 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.type;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.type.AbstractVariableWidthType;
import com.facebook.presto.spi.type.StandardTypes;
import com.facebook.presto.spi.type.TypeSignature;
import io.airlift.slice.Slice;
import io.airlift.slice.Slices;
/**
* The stack representation for JSON objects must have the keys in natural sorted order.
*/
public class JsonType
extends AbstractVariableWidthType
{
public static final JsonType JSON = new JsonType();
public JsonType()
{
super(new TypeSignature(StandardTypes.JSON), Slice.class);
}
@Override
public boolean isComparable()
{
return true;
}
@Override
public boolean equalTo(Block leftBlock, int leftPosition, Block rightBlock, int rightPosition)
{
Slice leftValue = leftBlock.getSlice(leftPosition, 0, leftBlock.getSliceLength(leftPosition));
Slice rightValue = rightBlock.getSlice(rightPosition, 0, rightBlock.getSliceLength(rightPosition));
return leftValue.equals(rightValue);
}
@Override
public long hash(Block block, int position)
{
return block.hash(position, 0, block.getSliceLength(position));
}
@Override
public Object getObjectValue(ConnectorSession session, Block block, int position)
{
if (block.isNull(position)) {
return null;
}
return block.getSlice(position, 0, block.getSliceLength(position)).toStringUtf8();
}
@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();
}
}