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Hibernate O/RM implementation of the Jakarta Persistence specification

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.dialect;

import java.sql.Types;
import java.util.Locale;

import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.sql.CaseFragment;
import org.hibernate.sql.DecodeCaseFragment;
import org.hibernate.sql.JoinFragment;
import org.hibernate.sql.OracleJoinFragment;

import org.jboss.logging.Logger;

/**
 * An SQL dialect for Oracle, compatible with Oracle 8.
 *
 * @deprecated Use Oracle8iDialect instead.
 * @author Gavin King
 */
@SuppressWarnings("deprecation")
@Deprecated
public class OracleDialect extends Oracle9Dialect {
	private static final CoreMessageLogger LOG = Logger.getMessageLogger(
			CoreMessageLogger.class,
			OracleDialect.class.getName()
	);

	/**
	 * Constructs a (DEPRECATED) Oracle9Dialect
	 */
	public OracleDialect() {
		super();
		LOG.deprecatedOracleDialect();
		// Oracle8 and previous define only a "DATE" type which
		//      is used to represent all aspects of date/time
		registerColumnType( Types.TIMESTAMP, "date" );
		registerColumnType( Types.CHAR, "char(1)" );
		registerColumnType( Types.VARCHAR, 4000, "varchar2($l)" );
	}

	@Override
	public JoinFragment createOuterJoinFragment() {
		return new OracleJoinFragment();
	}

	@Override
	public CaseFragment createCaseFragment() {
		return new DecodeCaseFragment();
	}

	@Override
	public String getLimitString(String sql, boolean hasOffset) {

		sql = sql.trim();
		boolean isForUpdate = false;
		if ( sql.toLowerCase(Locale.ROOT).endsWith( " for update" ) ) {
			sql = sql.substring( 0, sql.length()-11 );
			isForUpdate = true;
		}

		final StringBuilder pagingSelect = new StringBuilder( sql.length()+100 );
		if (hasOffset) {
			pagingSelect.append( "select * from ( select row_.*, rownum rownum_ from ( " );
		}
		else {
			pagingSelect.append( "select * from ( " );
		}
		pagingSelect.append( sql );
		if (hasOffset) {
			pagingSelect.append( " ) row_ ) where rownum_ <= ? and rownum_ > ?" );
		}
		else {
			pagingSelect.append( " ) where rownum <= ?" );
		}

		if ( isForUpdate ) {
			pagingSelect.append( " for update" );
		}

		return pagingSelect.toString();
	}

	@Override
	public String getSelectClauseNullString(int sqlType) {
		switch(sqlType) {
			case Types.VARCHAR:
			case Types.CHAR:
				return "to_char(null)";
			case Types.DATE:
			case Types.TIMESTAMP:
			case Types.TIME:
				return "to_date(null)";
			default:
				return "to_number(null)";
		}
	}

	@Override
	public String getCurrentTimestampSelectString() {
		return "select sysdate from dual";
	}

	@Override
	public String getCurrentTimestampSQLFunctionName() {
		return "sysdate";
	}
}