/**
* 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.types.mcompat.mcasts;
import com.foundationdb.server.types.TClass;
import com.foundationdb.server.types.TComparison;
import com.foundationdb.server.types.TInstance;
import com.foundationdb.server.types.TKeyComparable;
import com.foundationdb.server.types.mcompat.mtypes.MNumeric;
import com.foundationdb.server.types.value.ValueSource;
import com.foundationdb.server.types.value.ValueTarget;
import com.foundationdb.server.types.value.ValueTargets;
import com.google.common.primitives.Longs;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import static com.foundationdb.server.types.value.ValueSources.getLong;
public final class MKeyComparables {
public static final TKeyComparable[] intComparisons = createIntComparisons();
private static TKeyComparable[] createIntComparisons() {
final TComparison integerComparison = new TComparison() {
@Override
public int compare(TInstance leftInstance, ValueSource left, TInstance rightInstance, ValueSource right) {
if(left.isNull()) {
if(right.isNull()) {
return 0;
}
return -1;
}
if(right.isNull()) {
return 1;
}
return Longs.compare(getLong(left), getLong(right));
}
@Override
public void copyComparables(ValueSource source, ValueTarget target)
{
ValueTargets.putLong(target, getLong(source));
}
};
List<TClass> candidates = Arrays.<TClass>asList(
MNumeric.TINYINT, MNumeric.SMALLINT, MNumeric.MEDIUMINT, MNumeric.INT, MNumeric.BIGINT,
MNumeric.TINYINT_UNSIGNED, MNumeric.SMALLINT_UNSIGNED, MNumeric.MEDIUMINT_UNSIGNED,
MNumeric.INT_UNSIGNED
// BIGINT UNSIGNED is not here, because its representation is not a signed long
);
Set<Set<TClass>> alreadyCreated = new HashSet<>();
List<TKeyComparable> results = new ArrayList<>();
for (TClass outer : candidates) {
for (TClass inner : candidates) {
if (inner == outer)
continue;
Set<TClass> pair = new HashSet<>(Arrays.asList(inner, outer));
if (alreadyCreated.add(pair)) {
results.add(new TKeyComparable(outer, inner, integerComparison));
}
}
}
return results.toArray(new TKeyComparable[results.size()]);
}
private MKeyComparables() {}
}