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SQL support for Querydsl

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/*
 * Copyright 2018, The Querydsl Team (http://www.querydsl.com/team)
 *
 * 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 com.querydsl.sql.namemapping;

import com.querydsl.sql.SchemaAndTable;
import java.util.Optional;

/**
 * A {@link NameMapping} implementation that accepts zero or more {@link NameMapping}s and returns
 * the first non-null mapping result.
 */
public class ChainedNameMapping implements NameMapping {

  private NameMapping[] nameMappings;

  public ChainedNameMapping(NameMapping... nameMappings) {
    if (nameMappings == null) {
      throw new NullPointerException("Name mapping array must not be null");
    }
    for (NameMapping nameMapping : nameMappings) {
      if (nameMapping == null) {
        throw new NullPointerException("Name mapping array must not contain null element");
      }
    }
    this.nameMappings = nameMappings.clone();
  }

  @Override
  public Optional getColumnOverride(SchemaAndTable key, String column) {
    for (NameMapping nameMapping : nameMappings) {
      Optional overriddenColumnName = nameMapping.getColumnOverride(key, column);
      if (overriddenColumnName.isPresent()) {
        return overriddenColumnName;
      }
    }
    return Optional.empty();
  }

  @Override
  public Optional getOverride(SchemaAndTable key) {
    for (NameMapping nameMapping : nameMappings) {
      Optional overridden = nameMapping.getOverride(key);
      if (overridden.isPresent()) {
        return overridden;
      }
    }
    return Optional.empty();
  }
}