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/*
 * Copyright 2015 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.way.sql;

import java.util.List;

import br.com.objectos.way.core.util.WayIterables;

import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.ImmutableListMultimap.Builder;
import com.google.common.collect.ListMultimap;

/**
 * @author [email protected] (Marcio Endo)
 */
class ForeignKeyInfoMap {

  private final ListMultimap referencedColumnInfoMap;

  private ForeignKeyInfoMap(ListMultimap referencedColumnInfoMap) {
    this.referencedColumnInfoMap = referencedColumnInfoMap;
  }

  public static ForeignKeyInfoMap mapOf(TableInfo tableInfo) {
    Builder referencedColumnMap = ImmutableListMultimap.builder();

    Iterable parts = WayIterables.from(tableInfo.foreignKeyInfoList())
        .transformAndConcat(ForeignKeyInfoForeignKeyPartList.get())
        .toLazyIterable();

    for (ForeignKeyPart part : parts) {
      ColumnInfo columnInfo = part.columnInfo();
      ColumnInfo referencedColumnInfo = part.referencedColumnInfo();
      referencedColumnMap.put(columnInfo, referencedColumnInfo);
    }

    return new ForeignKeyInfoMap(referencedColumnMap.build());
  }

  public List getReferencedColumnInfoList(ColumnInfo columnInfo) {
    return referencedColumnInfoMap.get(columnInfo);
  }

}