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    • com.arcadedb.query.sql.function.coll.SQLFunctionSymmetricDifference Maven / Gradle / Ivy

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    /*
 * Copyright © 2021-present Arcade Data Ltd ([email protected])
 *
 * 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.
 *
 * SPDX-FileCopyrightText: 2021-present Arcade Data Ltd ([email protected])
 * SPDX-License-Identifier: Apache-2.0
 */
package com.arcadedb.query.sql.function.coll;

import com.arcadedb.database.Identifiable;
import com.arcadedb.query.sql.executor.CommandContext;

import java.util.*;

/**
 * This operator can work as aggregate or inline. If only one argument is passed than aggregates, otherwise executes, and returns,
 * the SYMMETRIC DIFFERENCE between the collections received as parameters. Works also with no collection values.
 *
 * @author Luca Garulli (l.garulli--(at)--gmail.com)
 */
public class SQLFunctionSymmetricDifference extends SQLFunctionMultiValueAbstract> {
  public static final String NAME = "symmetricDifference";

  private Set rejected;

  public SQLFunctionSymmetricDifference() {
    super(NAME);
  }

  private static void addItemToResult(final Object o, final Set accepted, final Set rejected) {
    if (!accepted.contains(o) && !rejected.contains(o)) {
      accepted.add(o);
    } else {
      accepted.remove(o);
      rejected.add(o);
    }
  }

  private static void addItemsToResult(final Collection co, final Set accepted, final Set rejected) {
    for (final Object o : co) {
      addItemToResult(o, accepted, rejected);
    }
  }

  @SuppressWarnings("unchecked")
  public Object execute(final Object iThis, final Identifiable iCurrentRecord, final Object iCurrentResult, final Object[] iParams,
      final CommandContext iContext) {
    if (iParams[0] == null)
      return null;

    final Object value = iParams[0];

    if (iParams.length == 1) {
      // AGGREGATION MODE (STATEFUL)
      if (context == null) {
        context = new HashSet();
        rejected = new HashSet();
      }
      if (value instanceof Collection) {
        addItemsToResult((Collection) value, context, rejected);
      } else {
        addItemToResult(value, context, rejected);
      }

      return null;
    } else {
      // IN-LINE MODE (STATELESS)
      final Set result = new HashSet();
      final Set rejected = new HashSet();

      for (final Object iParameter : iParams) {
        if (iParameter instanceof Collection) {
          addItemsToResult((Collection) iParameter, result, rejected);
        } else {
          addItemToResult(iParameter, result, rejected);
        }
      }

      return result;
    }
  }

  public String getSyntax() {
    return "difference(*)";
  }
}
    
    
    
    

    




    
    
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