/*
* 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.metadata;
import com.facebook.presto.block.Block;
import com.facebook.presto.block.BlockIterable;
import com.facebook.presto.operator.Page;
import com.facebook.presto.operator.PageBuilder;
import com.facebook.presto.spi.ColumnMetadata;
import com.facebook.presto.tuple.Tuple;
import com.facebook.presto.tuple.TupleInfo;
import com.facebook.presto.tuple.TupleInfo.Type;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import static com.facebook.presto.block.BlockIterables.createBlockIterable;
import static com.facebook.presto.block.BlockUtils.emptyBlockIterable;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
public class InternalTable
{
private final Map<String, BlockIterable> columns;
public InternalTable(Map<String, BlockIterable> columns)
{
this.columns = ImmutableMap.copyOf(checkNotNull(columns, "columns is null"));
}
public Set<String> getColumnNames()
{
return columns.keySet();
}
public BlockIterable getColumn(String columnName)
{
return columns.get(columnName);
}
public List<BlockIterable> getColumns(List<String> columnNames)
{
ImmutableList.Builder<BlockIterable> columns = ImmutableList.builder();
for (String columnName : columnNames) {
columns.add(getColumn(columnName));
}
return columns.build();
}
public static Builder builder(TupleInfo tupleInfo, String firstColumnName, String... otherColumnNames)
{
return new Builder(tupleInfo, ImmutableList.<String>builder().add(firstColumnName).add(otherColumnNames).build());
}
public static Builder builder(TupleInfo tupleInfo, List<String> columnNames)
{
return new Builder(tupleInfo, columnNames);
}
public static Builder builder(List<ColumnMetadata> columns)
{
ImmutableList.Builder<String> names = ImmutableList.builder();
ImmutableList.Builder<Type> types = ImmutableList.builder();
for (ColumnMetadata column : columns) {
names.add(column.getName());
types.add(Type.fromColumnType(column.getType()));
}
return new Builder(new TupleInfo(types.build()), names.build());
}
public static class Builder
{
private final TupleInfo tupleInfo;
private final List<TupleInfo> tupleInfos;
private final List<String> columnNames;
private final List<List<Block>> columns;
private PageBuilder pageBuilder;
public Builder(TupleInfo tupleInfo, List<String> columnNames)
{
this.tupleInfo = checkNotNull(tupleInfo, "tupleInfo is null");
tupleInfos = getTupleInfos(tupleInfo);
this.columnNames = ImmutableList.copyOf(checkNotNull(columnNames, "columnNames is null"));
checkArgument(columnNames.size() == tupleInfo.getFieldCount(),
"Column name count does not match tuple field count: columnNames=%s, tupleInfo=%s", columnNames, tupleInfo);
columns = new ArrayList<>();
for (int i = 0; i < tupleInfo.getFieldCount(); i++) {
columns.add(new ArrayList<Block>());
}
pageBuilder = new PageBuilder(tupleInfos);
}
public TupleInfo getTupleInfo()
{
return tupleInfo;
}
public Builder add(Tuple tuple)
{
checkArgument(tuple.getTupleInfo().equals(tupleInfo), "tuple schema does not match builder");
for (int i = 0; i < tupleInfo.getFieldCount(); i++) {
pageBuilder.getBlockBuilder(i).append(tuple, i);
}
if (pageBuilder.isFull()) {
flushPage();
pageBuilder = new PageBuilder(tupleInfos);
}
return this;
}
public InternalTable build()
{
flushPage();
ImmutableMap.Builder<String, BlockIterable> data = ImmutableMap.builder();
for (int i = 0; i < columns.size(); i++) {
List<Block> column = columns.get(i);
data.put(columnNames.get(i), column.isEmpty() ? emptyBlockIterable() : createBlockIterable(column));
}
return new InternalTable(data.build());
}
private void flushPage()
{
if (!pageBuilder.isEmpty()) {
Page page = pageBuilder.build();
for (int i = 0; i < tupleInfo.getFieldCount(); i++) {
columns.get(i).add(page.getBlock(i));
}
}
}
private static List<TupleInfo> getTupleInfos(TupleInfo tupleInfo)
{
ImmutableList.Builder<TupleInfo> list = ImmutableList.builder();
for (TupleInfo.Type type : tupleInfo.getTypes()) {
list.add(new TupleInfo(type));
}
return list.build();
}
}
}