/**
* Copyright (C) 2009-2013 FoundationDB, LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.foundationdb.server.store;
import com.foundationdb.util.Undef;
import com.persistit.Key;
import com.persistit.Value;
import java.util.ArrayList;
import java.util.List;
public abstract class IndexRecordVisitor extends IndexVisitor<Key,Value> {
protected abstract void visit(List<?> key, Object value);
@Override
protected final void visit(Key key, Value value) {
List<?> keyList = key(key, value);
Object valueObj = value.isDefined() ? value.get() : Undef.only();
visit(keyList, valueObj);
}
private List<?> key(Key key, Value value)
{
// Key traversal
key.indexTo(0);
List<Object> keyList = new ArrayList<>();
extractKeySegments(key, keyList);
// Value traversal. If the value is defined, then it contains more fields encoded like a key.
// TODO: What about group indexes?
if (!groupIndex() && value.isDefined()) {
Key buffer = new Key(key);
buffer.clear();
value.getByteArray(buffer.getEncodedBytes(), 0, 0, value.getArrayLength());
buffer.setEncodedSize(value.getArrayLength());
extractKeySegments(buffer, keyList);
}
return keyList;
}
private void extractKeySegments(Key key, List<Object> list)
{
int segments = key.getDepth();
for (int s = 0; s < segments; s++) {
list.add(key.decode());
}
}
}