/*
* 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.BlockUtils;
import com.facebook.presto.spi.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.spi.type.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(ColumnMetadata... columns)
{
return builder(ImmutableList.copyOf(columns));
}
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(column.getType());
}
return new Builder(types.build(), names.build());
}
public static class Builder
{
private final List<Type> types;
private final List<String> columnNames;
private final List<List<Block>> columns;
private PageBuilder pageBuilder;
public Builder(List<Type> types, List<String> columnNames)
{
this.types = ImmutableList.copyOf(checkNotNull(types, "types is null"));
this.columnNames = ImmutableList.copyOf(checkNotNull(columnNames, "columnNames is null"));
checkArgument(columnNames.size() == types.size(),
"Column name count does not match type count: columnNames=%s, types=%s", columnNames, types.size());
columns = new ArrayList<>();
for (int i = 0; i < types.size(); i++) {
columns.add(new ArrayList<Block>());
}
pageBuilder = new PageBuilder(types);
}
public List<Type> getTypes()
{
return types;
}
public Builder add(Object... values)
{
for (int i = 0; i < types.size(); i++) {
BlockUtils.appendObject(pageBuilder.getBlockBuilder(i), values[i]);
}
if (pageBuilder.isFull()) {
flushPage();
pageBuilder.reset();
}
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 < types.size(); i++) {
columns.get(i).add(page.getBlock(i));
}
}
}
}
}