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   *   Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
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  package org.apache.cayenne.dbsync.merge.token.db;
  
  import org.apache.cayenne.dba.DbAdapter;
  import org.apache.cayenne.dba.JdbcAdapter;
  import org.apache.cayenne.dba.QuotingStrategy;
  import org.apache.cayenne.dba.TypesMapping;
  import org.apache.cayenne.dbsync.merge.factory.MergerTokenFactory;
  import org.apache.cayenne.dbsync.merge.token.MergerToken;
  import org.apache.cayenne.map.DbAttribute;
  import org.apache.cayenne.map.DbEntity;
  
  import java.util.Collections;
  import java.util.List;
  
  /**
   * An {@link MergerToken} to use to set type, length and precision.
   */
  public class SetColumnTypeToDb extends AbstractToDbToken.Entity {
  
      private DbAttribute columnOriginal;
      private DbAttribute columnNew;
  
      public SetColumnTypeToDb(DbEntity entity, DbAttribute columnOriginal, DbAttribute columnNew) {
          super("Set Column Type", 60, entity);
          this.columnOriginal = columnOriginal;
          this.columnNew = columnNew;
      }
      
      /**
       * append the part of the token before the actual column data type
       * @param context 
       */
      protected void appendPrefix(StringBuffer sqlBuffer, QuotingStrategy context) {
          sqlBuffer.append("ALTER TABLE ");
          sqlBuffer.append(context.quotedFullyQualifiedName(getEntity()));
          sqlBuffer.append(" ALTER ");
          sqlBuffer.append(context.quotedName(columnNew));
          sqlBuffer.append(" TYPE ");
      }
  
      @Override
      public List<String> createSql(DbAdapter adapter) {
          StringBuffer sqlBuffer = new StringBuffer();
          appendPrefix(sqlBuffer, adapter.getQuotingStrategy());
    
          sqlBuffer.append(JdbcAdapter.getType(adapter, columnNew));
          sqlBuffer.append(JdbcAdapter.sizeAndPrecision(adapter, columnNew));
  
          return Collections.singletonList(sqlBuffer.toString());
      }
  
      @Override
      public String getTokenValue() {
          StringBuilder sb = new StringBuilder();
          sb.append(getEntity().getName());
          sb.append(".");
          sb.append(columnNew.getName());
  
          if (columnOriginal.getType() != columnNew.getType()) {
              sb.append(" type: ");
              sb.append(TypesMapping.getSqlNameByType(columnOriginal.getType()));
              sb.append(" -> ");
              sb.append(TypesMapping.getSqlNameByType(columnNew.getType()));
          }
  
          if (columnOriginal.getMaxLength() != columnNew.getMaxLength()) {
              sb.append(" maxLength: ");
              sb.append(columnOriginal.getMaxLength());
              sb.append(" -> ");
              sb.append(columnNew.getMaxLength());
          }
  
          if (columnOriginal.getAttributePrecision() != columnNew.getAttributePrecision()) {
              sb.append(" precision: ");
              sb.append(columnOriginal.getAttributePrecision());
              sb.append(" -> ");
              sb.append(columnNew.getAttributePrecision());
          }
  
          if (columnOriginal.getScale() != columnNew.getScale()) {
              sb.append(" scale: ");
              sb.append(columnOriginal.getScale());
              sb.append(" -> ");
              sb.append(columnNew.getScale());
          }
  
          return sb.toString();
      }
  
      @Override
      public MergerToken createReverse(MergerTokenFactory factory) {
          return factory.createSetColumnTypeToModel(getEntity(), columnNew, columnOriginal);
      }
  
      public DbAttribute getColumnNew() {
          return columnNew;
      }
  
      public DbAttribute getColumnOriginal() {
          return columnOriginal;
      }
  }
  