AllTableColumns.java

/*
Copyright (c) 2008 Health Market Science, Inc.

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.healthmarketscience.sqlbuilder;

import java.io.IOException;
import com.healthmarketscience.common.util.AppendableExt;
import com.healthmarketscience.sqlbuilder.dbspec.Table;



/**
 * Outputs a clause for SELECTing all columns from a table
 * <code>"&lt;alias&gt;.*"</code>
 *
 * @author James Ahlborn
 */
class AllTableColumns extends TableObject
{
  AllTableColumns(Table table) {
    super(table);
  }

  @Override
  protected void collectSchemaObjects(ValidationContext vContext)
  {
    super.collectSchemaObjects(vContext);

    // using this construct means we are essentially referencing *all* columns
    // in this table, so update the columns list accordingly
    vContext.getColumns().addAll(_table.getColumns());
  }
  
  @Override
  public void appendTo(AppendableExt app) throws IOException {
    ColumnObject.appendTableAliasPrefix(app, _table);
    app.append("*");
  }
}