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/*******************************************************************************
* Copyright (c) 2006, 2007 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the terms of
* the Eclipse Public License v1.0, which accompanies this distribution and is available at
* http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.core.internal.mappings;
import java.util.StringTokenizer;
public class RelationshipMappingTools
{
public static boolean targetEntityIsValid(String targetEntity) {
if (targetEntity == null) {
return true;
}
// balance is # of name tokens - # of period tokens seen so far
// initially 0; finally 1; should never drop < 0 or > 1
int balance = 0;
for (StringTokenizer t = new StringTokenizer(targetEntity, ".", true); t.hasMoreTokens();) {
String s = t.nextToken();
if (s.indexOf('.') >= 0) {
// this is a delimiter
if (s.length() > 1) {
// too many periods in a row
return false;
}
balance--;
if (balance < 0) {
return false;
}
} else {
// this is an identifier segment
balance++;
}
}
return (balance == 1);
}
}
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