/*
* 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;
import com.facebook.presto.spi.Page;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.type.BigintType;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.type.TypeUtils;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import java.util.List;
import java.util.Optional;
import static com.facebook.presto.RowPageBuilder.rowPageBuilder;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
public class RowPagesBuilder
{
public static RowPagesBuilder rowPagesBuilder(Type... types)
{
return rowPagesBuilder(ImmutableList.copyOf(types));
}
public static RowPagesBuilder rowPagesBuilder(Iterable<Type> types)
{
return new RowPagesBuilder(types);
}
public static RowPagesBuilder rowPagesBuilder(boolean hashEnabled, List<Integer> hashChannels, Type... types)
{
return rowPagesBuilder(hashEnabled, hashChannels, ImmutableList.copyOf(types));
}
public static RowPagesBuilder rowPagesBuilder(boolean hashEnabled, List<Integer> hashChannels, Iterable<Type> types)
{
return new RowPagesBuilder(hashEnabled, Optional.of(hashChannels), types);
}
private final ImmutableList.Builder<Page> pages = ImmutableList.builder();
private final List<Type> types;
private RowPageBuilder builder;
private final boolean hashEnabled;
private final Optional<List<Integer>> hashChannels;
RowPagesBuilder(Iterable<Type> types)
{
this(false, Optional.empty(), types);
}
RowPagesBuilder(boolean hashEnabled, Optional<List<Integer>> hashChannels, Iterable<Type> types)
{
this.types = ImmutableList.copyOf(requireNonNull(types, "types is null"));
this.hashEnabled = hashEnabled;
this.hashChannels = hashChannels;
builder = rowPageBuilder(types);
}
public RowPagesBuilder addSequencePage(int length, int... initialValues)
{
checkArgument(length > 0, "length must be at least 1");
requireNonNull(initialValues, "initialValues is null");
checkArgument(initialValues.length == types.size(), "Expected %s initialValues, but got %s", types.size(), initialValues.length);
pageBreak();
Page page = SequencePageBuilder.createSequencePage(types, length, initialValues);
pages.add(page);
return this;
}
public RowPagesBuilder addBlocksPage(Block... blocks)
{
pages.add(new Page(blocks));
return this;
}
public RowPagesBuilder row(Object... values)
{
builder.row(values);
return this;
}
public RowPagesBuilder rows(Object[]... rows)
{
for (Object[] row : rows) {
row(row);
}
return this;
}
public RowPagesBuilder pageBreak()
{
if (!builder.isEmpty()) {
pages.add(builder.build());
builder = rowPageBuilder(types);
}
return this;
}
public List<Page> build()
{
pageBreak();
List<Page> resultPages = pages.build();
if (hashEnabled) {
return pagesWithHash(resultPages);
}
return resultPages;
}
private List<Page> pagesWithHash(List<Page> pages)
{
ImmutableList.Builder<Page> resultPages = ImmutableList.builder();
for (Page page : pages) {
resultPages.add(TypeUtils.getHashPage(page, types, hashChannels.get()));
}
return resultPages.build();
}
public List<Type> getTypes()
{
if (hashEnabled) {
return ImmutableList.copyOf(Iterables.concat(types, ImmutableList.of(BigintType.BIGINT)));
}
return types;
}
public List<Type> getTypesWithoutHash()
{
return types;
}
public Optional<Integer> getHashChannel()
{
if (hashEnabled) {
return Optional.of(types.size());
}
return Optional.empty();
}
}