RemovableRelationIterator.java

// Copyright 2017 JanusGraph Authors
//
// 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 org.janusgraph.graphdb.vertices;

import org.janusgraph.core.JanusGraphRelation;
import org.janusgraph.graphdb.internal.InternalRelation;

import java.util.Iterator;

public class RemovableRelationIterator<O extends JanusGraphRelation>
        implements Iterator<O> {


    private final Iterator<InternalRelation> iterator;
    private InternalRelation current;

    public RemovableRelationIterator(Iterator<InternalRelation> iter) {
        iterator = iter;
        current = null;
    }

    @Override
    public boolean hasNext() {
        return iterator.hasNext();

    }

    @SuppressWarnings("unchecked")
    @Override
    public O next() {
        current = iterator.next();
        return (O) current;
    }

    @Override
    public void remove() {
        assert current != null;
        //iterator.remove();
        current.remove();
    }


}