/*
 * 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.lucene.util.fst;

import org.apache.lucene.tests.util.LuceneTestCase;
import org.apache.lucene.util.IntsRef;

public class TestNegativeOversizingFactor extends LuceneTestCase {

  public void testNegativeInfinityDisablesDirectAddressing() throws Exception {
    NoOutputs outputs = NoOutputs.getSingleton();
    FSTCompiler<Object> compiler =
        new FSTCompiler.Builder<>(FST.INPUT_TYPE.BYTE4, outputs)
            .directAddressingMaxOversizingFactor(Float.NEGATIVE_INFINITY)
            .build();
    for (int label : new int[] {0, 1, 2, 3, 1 << 20}) {
      compiler.add(new IntsRef(new int[] {label}, 0, 1), outputs.getNoOutput());
    }
    FST<Object> fst = FST.fromFSTReader(compiler.compile(), compiler.getFSTReader());
    FST.Arc<Object> root =
        fst.readFirstTargetArc(fst.getFirstArc(new FST.Arc<>()), new FST.Arc<>(), fst.getBytesReader());
    // expected: binary-search root node (a negative factor disables direct addressing); actual: direct addressing
    assertEquals("FST size " + compiler.fstSizeInBytes(), FST.ARCS_FOR_BINARY_SEARCH, root.nodeFlags());
  }
}