/*
* 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.ColumnMetadata;
import com.facebook.presto.spi.Page;
import com.facebook.presto.spi.PageBuilder;
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 static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
public class InternalTable
{
private final Map<String, Integer> columnIndexes;
private final List<Page> pages;
public InternalTable(Map<String, Integer> columnIndexes, Iterable<Page> pages)
{
this.columnIndexes = ImmutableMap.copyOf(checkNotNull(columnIndexes, "columnIndexes is null"));
this.pages = ImmutableList.copyOf(checkNotNull(pages, "pages is null"));
}
public int getColumnIndex(String columnName)
{
Integer index = columnIndexes.get(columnName);
checkArgument(index != null, "Column %s not found", columnName);
return index;
}
public List<Page> getPages()
{
return pages;
}
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(names.build(), types.build());
}
public static class Builder
{
private final Map<String, Integer> columnIndexes;
private final List<Type> types;
private final List<Page> pages;
private PageBuilder pageBuilder;
public Builder(List<String> columnNames, List<Type> types)
{
checkNotNull(columnNames, "columnNames is null");
ImmutableMap.Builder<String, Integer> columnIndexes = ImmutableMap.builder();
int columnIndex = 0;
for (String columnName : columnNames) {
columnIndexes.put(columnName, columnIndex++);
}
this.columnIndexes = columnIndexes.build();
this.types = ImmutableList.copyOf(checkNotNull(types, "types is null"));
checkArgument(columnNames.size() == types.size(),
"Column name count does not match type count: columnNames=%s, types=%s", columnNames, types.size());
pages = new ArrayList<>();
pageBuilder = new PageBuilder(types);
}
public Builder add(Object... values)
{
for (int i = 0; i < types.size(); i++) {
BlockUtils.appendObject(types.get(i), pageBuilder.getBlockBuilder(i), values[i]);
}
if (pageBuilder.isFull()) {
flushPage();
}
return this;
}
public InternalTable build()
{
flushPage();
return new InternalTable(columnIndexes, pages);
}
private void flushPage()
{
if (!pageBuilder.isEmpty()) {
pages.add(pageBuilder.build());
pageBuilder.reset();
}
}
}
}