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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.method.string;

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

/**
 * Returns a character in a string.
 *
 * @author Johann Sorel (Geomatys)
 * @author Luca Garulli (l.garulli--(at)--gmail.com)
 */
public class SQLMethodCharAt extends AbstractSQLMethod {

  public static final String NAME = "charat";

  public SQLMethodCharAt() {
    super(NAME, 1, 1);
  }

  @Override
  public String getSyntax() {
    return "charAt()";
  }

  @Override
  public Object execute(final Object iThis, final Identifiable iCurrentRecord, final CommandContext iContext, final Object ioResult, final Object[] iParams) {
    if (iParams[0] == null) {
      return null;
    }

    final int index = Integer.parseInt(iParams[0].toString());
    return "" + iThis.toString().charAt(index);
  }
}