DataCategoryTypeAVLComparator.java

/*
 * Copyright 2008 Fedora Commons, Inc.
 *
 * 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.mulgara.store.stringpool.xa11;

import org.mulgara.store.stringpool.SPObject;
import org.mulgara.store.xa.AVLComparator;
import org.mulgara.store.xa.AVLNode;

/**
 * Compares data objects by type and category only.
 *
 * @created Aug 14, 2008
 * @author Paula Gearon
 * @copyright © 2008 <a href="http://www.fedora-commons.org/">Fedora Commons</a>
 */
public class DataCategoryTypeAVLComparator implements AVLComparator {


  private final int typeCategoryId;
  private final int typeId;

  DataCategoryTypeAVLComparator(int typeCategoryId, int typeId) {
    this.typeCategoryId = typeCategoryId;
    this.typeId = typeId;
    assert typeCategoryId == SPObject.TypeCategory.TCID_TYPED_LITERAL;
  }

  public int compare(long[] key, AVLNode avlNode) {
    // NOTE: ignore key.

    // First, order by type category ID.
    int nodeTypeCategoryId = DataStruct.getTypeCategoryId(avlNode);
    int c = typeCategoryId - nodeTypeCategoryId;
    if (c != 0) return c;

    // Second, order by type node.
    int nodeTypeId = DataStruct.getTypeId(avlNode);
    return typeId <= nodeTypeId ? -1 : 1;
  }

}