org.apache.usergrid.persistence.query.ir.result.InOrderIterator.java Source code

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Here is the source code for org.apache.usergrid.persistence.query.ir.result.InOrderIterator.java

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/*
 * 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 org.apache.usergrid.persistence.query.ir.result;

import java.nio.ByteBuffer;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.UUID;

import org.junit.Ignore;
import org.apache.usergrid.persistence.cassandra.CursorCache;

import com.google.common.collect.Iterables;

/**
 * Simple iterator for testing that iterates UUIDs in the order returned
 *
 * @author tnine
 */
@Ignore("not a test")
public class InOrderIterator implements ResultIterator {

    private LinkedHashSet<ScanColumn> uuids = new LinkedHashSet<ScanColumn>();
    private Iterator<List<ScanColumn>> iterator;
    private int pageSize = 1000;

    public InOrderIterator(int pageSize) {
        this.pageSize = pageSize;
    }

    /** Add a uuid to the list */
    public void add(UUID... ids) {
        for (UUID current : ids) {
            uuids.add(new UUIDIndexSliceParser.UUIDColumn(current, ByteBuffer.allocate(0)));
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Iterable#iterator()
     */
    @Override
    public Iterator<Set<ScanColumn>> iterator() {
        if (iterator == null) {
            reset();
        }

        return this;
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.util.Iterator#hasNext()
     */
    @Override
    public boolean hasNext() {
        if (iterator == null) {
            reset();
        }

        return iterator.hasNext();
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.util.Iterator#next()
     */
    @Override
    public Set<ScanColumn> next() {
        if (iterator == null) {
            reset();
        }

        return new LinkedHashSet<ScanColumn>(iterator.next());
    }

    /* (non-Javadoc)
     * @see org.apache.usergrid.persistence.query.ir.result.ResultIterator#reset()
     */
    @Override
    public void reset() {
        this.iterator = Iterables.partition(uuids, pageSize).iterator();
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.util.Iterator#remove()
     */
    @Override
    public void remove() {
    }

    /* (non-Javadoc)
     * @see org.apache.usergrid.persistence.query.ir.result.ResultIterator#finalizeCursor(org.apache.usergrid.persistence.cassandra
     * .CursorCache)
     */
    @Override
    public void finalizeCursor(CursorCache cache, UUID lastLoaded) {

    }
}