/*
* 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.operator;
import com.facebook.presto.spi.Page;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.type.Type;
import com.google.common.collect.ImmutableList;
import java.util.List;
import static com.facebook.presto.operator.RowPageBuilder.rowPageBuilder;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
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);
}
private final ImmutableList.Builder<Page> pages = ImmutableList.builder();
private final List<Type> types;
private RowPageBuilder builder;
RowPagesBuilder(Iterable<Type> types)
{
this.types = ImmutableList.copyOf(checkNotNull(types, "types is null"));
builder = rowPageBuilder(types);
}
public RowPagesBuilder addSequencePage(int length, int... initialValues)
{
checkArgument(length > 0, "length must be at least 1");
checkNotNull(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 pageBreak()
{
if (!builder.isEmpty()) {
pages.add(builder.build());
builder = rowPageBuilder(types);
}
return this;
}
public List<Page> build()
{
pageBreak();
return pages.build();
}
}