/*
* 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.tests.tpch;
import com.facebook.presto.spi.RecordCursor;
import com.facebook.presto.spi.RecordSet;
import com.facebook.presto.spi.type.Type;
import com.google.common.collect.ImmutableList;
import io.airlift.slice.Slice;
import java.util.ArrayList;
import java.util.List;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkPositionIndex;
import static java.util.Objects.requireNonNull;
class AppendingRecordSet
implements RecordSet
{
private final RecordSet delegate;
private final List<Object> appendedValues;
private final List<Type> appendedTypes;
public AppendingRecordSet(RecordSet delegate, List<Object> appendedValues, List<Type> appendedTypes)
{
this.delegate = requireNonNull(delegate, "delegate is null");
this.appendedValues = new ArrayList<>(requireNonNull(appendedValues, "appendedValues is null")); // May contain null elements
this.appendedTypes = ImmutableList.copyOf(requireNonNull(appendedTypes, "appendedTypes is null"));
checkArgument(appendedValues.size() == appendedTypes.size(), "appendedValues must have the same size as appendedTypes");
for (int i = 0; i < appendedValues.size(); i++) {
Object value = appendedValues.get(i);
if (value != null) {
checkArgument(appendedTypes.get(i).getJavaType().isInstance(value), "Object value does not match declared type");
}
}
}
@Override
public List<Type> getColumnTypes()
{
return ImmutableList.<Type>builder()
.addAll(delegate.getColumnTypes())
.addAll(appendedTypes)
.build();
}
@Override
public RecordCursor cursor()
{
return new AppendingRecordCursor(delegate.cursor(), delegate.getColumnTypes().size(), appendedValues, appendedTypes);
}
private static class AppendingRecordCursor
implements RecordCursor
{
private final RecordCursor delegate;
private final int delegateFieldCount;
private final List<Object> appendedValues;
private final List<Type> appendedTypes;
private AppendingRecordCursor(RecordCursor delegate, int delegateFieldCount, List<Object> appendedValues, List<Type> appendedTypes)
{
this.delegate = requireNonNull(delegate, "delegate is null");
this.delegateFieldCount = delegateFieldCount;
checkArgument(delegateFieldCount >= 0, "delegateFieldCount must be greater than or equal to zero");
this.appendedValues = requireNonNull(appendedValues, "appendedValues is null"); // May contain null elements
this.appendedTypes = ImmutableList.copyOf(requireNonNull(appendedTypes, "appendedTypes is null"));
checkArgument(appendedValues.size() == appendedTypes.size(), "appendedValues must have the same size as appendedTypes");
}
@Override
public long getTotalBytes()
{
return 0;
}
@Override
public long getCompletedBytes()
{
return 0;
}
@Override
public long getReadTimeNanos()
{
return 0;
}
@Override
public Type getType(int field)
{
checkPositionIndex(field, delegateFieldCount + appendedTypes.size());
if (field < delegateFieldCount) {
return delegate.getType(field);
}
else {
return appendedTypes.get(field - delegateFieldCount);
}
}
@Override
public boolean advanceNextPosition()
{
return delegate.advanceNextPosition();
}
@Override
public boolean getBoolean(int field)
{
checkPositionIndex(field, delegateFieldCount + appendedTypes.size());
if (field < delegateFieldCount) {
return delegate.getBoolean(field);
}
else {
return (Boolean) appendedValues.get(field - delegateFieldCount);
}
}
@Override
public long getLong(int field)
{
checkPositionIndex(field, delegateFieldCount + appendedTypes.size());
if (field < delegateFieldCount) {
return delegate.getLong(field);
}
else {
return (Long) appendedValues.get(field - delegateFieldCount);
}
}
@Override
public double getDouble(int field)
{
checkPositionIndex(field, delegateFieldCount + appendedTypes.size());
if (field < delegateFieldCount) {
return delegate.getDouble(field);
}
else {
return (Double) appendedValues.get(field - delegateFieldCount);
}
}
@Override
public Slice getSlice(int field)
{
checkPositionIndex(field, delegateFieldCount + appendedTypes.size());
if (field < delegateFieldCount) {
return delegate.getSlice(field);
}
else {
return (Slice) appendedValues.get(field - delegateFieldCount);
}
}
@Override
public Object getObject(int field)
{
throw new UnsupportedOperationException();
}
@Override
public boolean isNull(int field)
{
checkPositionIndex(field, delegateFieldCount + appendedTypes.size());
if (field < delegateFieldCount) {
return delegate.isNull(field);
}
else {
return appendedValues.get(field - delegateFieldCount) == null;
}
}
@Override
public void close()
{
delegate.close();
}
}
}