/*
* Copyright 2010 Dennis Butterstein, Ralf Joachim
*
* 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.
*
* $Id: SQLStatementDelete.java 8469 2009-12-28 16:47:54Z rjoachim $
*/
package org.castor.cpa.persistence.sql.query.visitor;
import java.util.StringTokenizer;
import org.castor.cpa.persistence.sql.query.QueryConstants;
import org.castor.cpa.persistence.sql.query.Select;
/**
* Visitor defining special behavior of query building for SapDb database.
*
* @author <a href="mailto:madsheepscarer AT googlemail DOT com">Dennis Butterstein</a>
* @version $Revision: 8469 $ $Date: 2006-04-25 15:08:23 -0600 (Tue, 25 Apr 2006) $
*/
public final class SapDbQueryVisitor extends DefaultQueryVisitor {
//-----------------------------------------------------------------------------------
/**
* {@inheritDoc}
*/
protected String quoteName(final String name) {
StringBuffer buffer = new StringBuffer();
StringTokenizer tokens = new StringTokenizer(name, ".");
String token = null;
boolean addQuote = true;
buffer.append('\"');
buffer.append(tokens.nextToken().toUpperCase());
while (tokens.hasMoreTokens()) {
token = tokens.nextToken();
if (isAFunction(token)) {
addQuote = false;
buffer.append("\".");
} else {
buffer.append("\".\"");
token = token.toUpperCase();
}
buffer.append(token);
}
if (addQuote) {
buffer.append('\"');
}
return buffer.toString();
}
/**
* Tests a text string against a known list of functions to determine if it is a function.
*
* @param text The text to be checked.
* @return <code>true</code> if text is a known function name, <code>false</code>
* otherwise.
*/
private boolean isAFunction(final String text) {
boolean isAFunction = false;
// Add all supported functions in SAP DB here
String[] knownFunctions = new String[] {
"nextval",
"currval"
};
for (int i = 0; i < knownFunctions.length; ++i) {
String function = knownFunctions[i];
if (text.equals(function)) {
return true;
}
}
return isAFunction;
}
/**
* {@inheritDoc}
*/
protected void handleLock(final Select select) {
if (select.isLocked()) {
_queryString.append(QueryConstants.SPACE);
_queryString.append(QueryConstants.WITH);
_queryString.append(QueryConstants.SPACE);
_queryString.append(QueryConstants.LOCK);
}
}
//-----------------------------------------------------------------------------------
}