com.hazelcast.org.apache.calcite.util.mapping.AbstractSourceMapping Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you 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.hazelcast.org.apache.calcite.util.mapping;
import java.util.Iterator;
/**
* Simple implementation of
* {@link com.hazelcast.org.apache.calcite.util.mapping.Mappings.TargetMapping} where the
* number of sources and targets are specified as constructor parameters, and you
* just need to implement one method.
*/
public abstract class AbstractSourceMapping
extends Mappings.AbstractMapping
implements Mapping {
private final int sourceCount;
private final int targetCount;
protected AbstractSourceMapping(int sourceCount, int targetCount) {
this.sourceCount = sourceCount;
this.targetCount = targetCount;
}
@Override public int getSourceCount() {
return sourceCount;
}
@Override public int getTargetCount() {
return targetCount;
}
@Override public Mapping inverse() {
return Mappings.invert(this);
}
@Override public int size() {
return targetCount;
}
@Override public void clear() {
throw new UnsupportedOperationException();
}
@Override public MappingType getMappingType() {
return MappingType.INVERSE_PARTIAL_FUNCTION;
}
@SuppressWarnings("method.invocation.invalid")
@Override public Iterator iterator() {
return new Iterator() {
int source;
int target = -1;
{
moveToNext();
}
private void moveToNext() {
while (++target < targetCount) {
source = getSourceOpt(target);
if (source >= 0) {
break;
}
}
}
@Override public boolean hasNext() {
return target < targetCount;
}
@Override public IntPair next() {
IntPair p = new IntPair(source, target);
moveToNext();
return p;
}
@Override public void remove() {
throw new UnsupportedOperationException("remove");
}
};
}
@Override public abstract int getSourceOpt(int source);
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy