studio.raptor.sqlparser.fast.expression.Wildcard Maven / Gradle / Ivy

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/*
 * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
 * and the EPL 1.0 (http://h2database.com/html/license.html).
 * Initial Developer: H2 Group
 */
package studio.raptor.sqlparser.fast.expression;

import studio.raptor.sqlparser.fast.api.ErrorCode;
import studio.raptor.sqlparser.fast.message.ParseException;
import studio.raptor.sqlparser.fast.util.StringUtils;
import studio.raptor.sqlparser.fast.value.Value;
import studio.raptor.sqlparser.fast.table.ColumnResolver;

/**
 * A wildcard expression as in SELECT * FROM TEST.
 * This object is only used temporarily during the parsing phase, and later
 * replaced by column expressions.
 */
public class Wildcard extends Expression {

  private final String table;

  public Wildcard(String table) {
    this.table = table;
  }

  @Override
  public boolean isWildcard() {
    return true;
  }

  @Override
  public void mapColumns(ColumnResolver resolver, int level) {
    throw ParseException.get(ErrorCode.SYNTAX_ERROR_1, table);
  }

  @Override
  public Expression optimize() {
    throw ParseException.get(ErrorCode.SYNTAX_ERROR_1, table);
  }

  @Override
  public String getTableAlias() {
    return table;
  }

  @Override
  public String getSQL() {
    if (table == null) {
      return "*";
    }
    return StringUtils.quoteIdentifier(table) + ".*";
  }

  @Override
  public boolean isEverything(ExpressionVisitor visitor) {
    if (visitor.getType() == ExpressionVisitor.QUERY_COMPARABLE) {
      return true;
    }
    throw ParseException.throwInternalError("" + visitor.getType());
  }

  @Override
  public Value getValue() {
    return null;
  }

  @Override
  public int getType() {
    return 0;
  }
}