Package org.hibernate.tool.hbm2ddl

Source Code of org.hibernate.tool.hbm2ddl.ForeignKeyMetadata

/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors.  All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA  02110-1301  USA
*
*/
package org.hibernate.tool.hbm2ddl;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.hibernate.mapping.Column;
import org.hibernate.mapping.ForeignKey;

/**
* JDBC foreign key metadata
* @author Christoph Sturm
*/
public class ForeignKeyMetadata {
  private final String name;
  private final String refTable;
  private final Map references = new HashMap();

  ForeignKeyMetadata(ResultSet rs) throws SQLException {
    name = rs.getString("FK_NAME");
    refTable = rs.getString("PKTABLE_NAME");
  }

  public String getName() {
    return name;
  }

  void addReference(ResultSet rs) throws SQLException {
    references.put(rs.getString("FKCOLUMN_NAME").toLowerCase(),
        rs.getString("PKCOLUMN_NAME"));
  }

  private boolean hasReference(Column column, Column ref) {
    String refName = (String) references.get(column.getName().toLowerCase());
    return ref.getName().equalsIgnoreCase(refName);
  }

  public boolean matches(ForeignKey fk) {
    if (refTable.equalsIgnoreCase(fk.getReferencedTable().getName())) {
      if (fk.getColumnSpan() == references.size()) {
        List fkRefs;
        if (fk.isReferenceToPrimaryKey()) {
          fkRefs = fk.getReferencedTable().getPrimaryKey().getColumns();
        }
        else {
          fkRefs = fk.getReferencedColumns();       
        }
        for (int i = 0; i < fk.getColumnSpan(); i++) {
          Column column = fk.getColumn(i);
          Column ref = (Column) fkRefs.get(i);
          if (!hasReference(column, ref)) {
            return false;
          }
        }
        return true;
      }
    }
    return false;
  }
 
  public String toString() {
    return "ForeignKeyMetadata(" + name + ')';
  }
}





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