com.mysema.query.group.GSet Maven / Gradle / Ivy
/*
* Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
*
* 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.mysema.query.group;
import java.util.*;
import com.mysema.query.types.Expression;
/**
* @author tiwe
*
* @param
*/
abstract class GSet> extends AbstractGroupExpression {
private static final long serialVersionUID = -1575808026237160843L;
public GSet(Expression expr) {
super(Set.class, expr);
}
protected abstract S createSet();
@Override
public GroupCollector createGroupCollector() {
return new GroupCollector() {
private final S set = createSet();
@Override
public void add(T o) {
if (o != null) {
set.add(o);
}
}
@Override
public S get() {
return set;
}
};
}
public static GSet> createLinked(Expression expr) {
return new GSet>(expr) {
@Override
protected Set createSet() {
return new LinkedHashSet();
}
};
}
public static > GSet> createSorted(Expression expr) {
return new GSet>(expr) {
@Override
protected SortedSet createSet() {
return new TreeSet();
}
};
}
public static GSet> createSorted(Expression expr, final Comparator comparator) {
return new GSet>(expr) {
@Override
protected SortedSet createSet() {
return new TreeSet(comparator);
}
};
}
}