/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.api.java.typeutils.runtime;
import eu.stratosphere.api.common.typeutils.TypeComparator;
import eu.stratosphere.api.common.typeutils.TypePairComparator;
import eu.stratosphere.api.common.typeutils.TypePairComparatorFactory;
import eu.stratosphere.api.java.tuple.Tuple;
public final class RuntimePairComparatorFactory<T1 extends Tuple, T2 extends Tuple> implements TypePairComparatorFactory<T1, T2>, java.io.Serializable {
private static final long serialVersionUID = 1L;
@SuppressWarnings("unchecked")
@Override
public TypePairComparator<T1, T2> createComparator12(TypeComparator<T1> comparator1, TypeComparator<T2> comparator2) {
if ((comparator1 instanceof TupleLeadingFieldComparator) && (comparator2 instanceof TupleLeadingFieldComparator)) {
TypeComparator<?> comp1 = ((TupleLeadingFieldComparator<?,?>) comparator1).getFieldComparator();
TypeComparator<?> comp2 = ((TupleLeadingFieldComparator<?,?>) comparator2).getFieldComparator();
return createLeadingFieldPairComp(comp1, comp2);
}
else {
int[] keyPos1;
int[] keyPos2;
TypeComparator<Object>[] comps1;
TypeComparator<Object>[] comps2;
// get info from first comparator
if (comparator1 instanceof TupleComparator) {
TupleComparator<?> tupleComp1 = (TupleComparator<?>) comparator1;
keyPos1 = tupleComp1.getKeyPositions();
comps1 = tupleComp1.getComparators();
}
else if (comparator1 instanceof TupleLeadingFieldComparator) {
TupleLeadingFieldComparator<?, ?> tupleComp1 = (TupleLeadingFieldComparator<?, ?>) comparator1;
keyPos1 = new int[] {0};
comps1 = new TypeComparator[] { tupleComp1.getFieldComparator() };
}
else {
throw new IllegalArgumentException("Cannot instantiate pair comparator from the given comparator: " + comparator1);
}
// get info from second comparator
if (comparator2 instanceof TupleComparator) {
TupleComparator<?> tupleComp2 = (TupleComparator<?>) comparator2;
keyPos2 = tupleComp2.getKeyPositions();
comps2 = tupleComp2.getComparators();
}
else if (comparator2 instanceof TupleLeadingFieldComparator) {
TupleLeadingFieldComparator<?, ?> tupleComp2 = (TupleLeadingFieldComparator<?, ?>) comparator2;
keyPos2 = new int[] {0};
comps2 = new TypeComparator[] { tupleComp2.getFieldComparator() };
}
else {
throw new IllegalArgumentException("Cannot instantiate pair comparator from the given comparator: " + comparator1);
}
return (TypePairComparator<T1, T2>) new TuplePairComparator<Tuple, Tuple>(keyPos1, keyPos2, comps1, comps2);
}
}
@SuppressWarnings("unchecked")
@Override
public TypePairComparator<T2, T1> createComparator21(TypeComparator<T1> comparator1, TypeComparator<T2> comparator2) {
if ((comparator1 instanceof TupleLeadingFieldComparator) && (comparator2 instanceof TupleLeadingFieldComparator)) {
TypeComparator<?> comp1 = ((TupleLeadingFieldComparator<?,?>) comparator1).getFieldComparator();
TypeComparator<?> comp2 = ((TupleLeadingFieldComparator<?,?>) comparator2).getFieldComparator();
return createLeadingFieldPairComp(comp2, comp1);
}
else {
int[] keyPos1;
int[] keyPos2;
TypeComparator<Object>[] comps1;
TypeComparator<Object>[] comps2;
// get info from first comparator
if (comparator1 instanceof TupleComparator) {
TupleComparator<?> tupleComp1 = (TupleComparator<?>) comparator1;
keyPos1 = tupleComp1.getKeyPositions();
comps1 = tupleComp1.getComparators();
}
else if (comparator1 instanceof TupleLeadingFieldComparator) {
TupleLeadingFieldComparator<?, ?> tupleComp1 = (TupleLeadingFieldComparator<?, ?>) comparator1;
keyPos1 = new int[] {0};
comps1 = new TypeComparator[] { tupleComp1.getFieldComparator() };
}
else {
throw new IllegalArgumentException("Cannot instantiate pair comparator from the given comparator: " + comparator1);
}
// get info from second comparator
if (comparator2 instanceof TupleComparator) {
TupleComparator<?> tupleComp2 = (TupleComparator<?>) comparator2;
keyPos2 = tupleComp2.getKeyPositions();
comps2 = tupleComp2.getComparators();
}
else if (comparator2 instanceof TupleLeadingFieldComparator) {
TupleLeadingFieldComparator<?, ?> tupleComp2 = (TupleLeadingFieldComparator<?, ?>) comparator2;
keyPos2 = new int[] {0};
comps2 = new TypeComparator[] { tupleComp2.getFieldComparator() };
}
else {
throw new IllegalArgumentException("Cannot instantiate pair comparator from the given comparator: " + comparator1);
}
return (TypePairComparator<T2, T1>) new TuplePairComparator<Tuple, Tuple>(keyPos2, keyPos1, comps2, comps1);
}
}
private static <K, T1 extends Tuple, T2 extends Tuple> TupleLeadingFieldPairComparator<K, T1, T2> createLeadingFieldPairComp(
TypeComparator<?> comp1, TypeComparator<?> comp2)
{
@SuppressWarnings("unchecked")
TypeComparator<K> c1 = (TypeComparator<K>) comp1;
@SuppressWarnings("unchecked")
TypeComparator<K> c2 = (TypeComparator<K>) comp2;
return new TupleLeadingFieldPairComparator<K, T1, T2>(c1, c2);
}
}