HHH-3216 : ParameterParser + escaped function call syntax

git-svn-id: https://svn.jboss.org/repos/hibernate/core/trunk@15200 1b8cb986-b30d-0410-93ca-fae66ebed9b2

core/src/main/java/org/hibernate/engine/query/ParameterParser.java

@@ -46,8 +46,10 @@ public class ParameterParser {
 		public void other(char character);
 	}
 
+	/**
+	 * Direct instantiation of ParameterParser disallowed.
+	 */
 	private ParameterParser() {
-		// disallow instantiation
 	}
 
 	/**
@@ -60,12 +62,10 @@ public class ParameterParser {
 	 *
 	 * @param sqlString The string to be parsed/tokenized.
 	 * @param recognizer The thing which handles recognition events.
-	 * @throws QueryException
+	 * @throws QueryException Indicates unexpected parameter conditions.
 	 */
 	public static void parse(String sqlString, Recognizer recognizer) throws QueryException {
-		boolean hasMainOutputParameter = sqlString.indexOf( "call" ) > 0 &&
-		                                 sqlString.indexOf( "?" ) < sqlString.indexOf( "call" ) &&
-		                                 sqlString.indexOf( "=" ) < sqlString.indexOf( "call" );
+		boolean hasMainOutputParameter = startsWithEscapeCallTemplate( sqlString );
 		boolean foundMainOutputParam = false;
 
 		int stringLength = sqlString.length();
@@ -89,8 +89,9 @@ public class ParameterParser {
 					int chopLocation = right < 0 ? sqlString.length() : right;
 					String param = sqlString.substring( indx + 1, chopLocation );
 					if ( StringHelper.isEmpty( param ) ) {
-						throw new QueryException("Space is not allowed after parameter prefix ':' '"
-								+ sqlString + "'");
+						throw new QueryException(
+								"Space is not allowed after parameter prefix ':' [" + sqlString + "]"
+						);
 					}
 					recognizer.namedParameter( param, indx );
 					indx = chopLocation - 1;
@@ -129,4 +130,34 @@ public class ParameterParser {
 		}
 	}
 
+	public static boolean startsWithEscapeCallTemplate(String sqlString) {
+		if ( ! ( sqlString.startsWith( "{" ) && sqlString.endsWith( "}" ) ) ) {
+			return false;
+		}
+
+		int chopLocation = sqlString.indexOf( "call" );
+		if ( chopLocation <= 0 ) {
+			return false;
+		}
+
+		final String checkString = sqlString.substring( 1, chopLocation + 4 );
+		final String fixture = "?=call";
+		int fixturePosition = 0;
+		boolean matches = true;
+		for ( int i = 0, max = checkString.length(); i < max; i++ ) {
+			final char c = Character.toLowerCase( checkString.charAt( i ) );
+			if ( Character.isWhitespace( c ) ) {
+				continue;
+			}
+			if ( c == fixture.charAt( fixturePosition ) ) {
+				fixturePosition++;
+				continue;
+			}
+			matches = false;
+			break;
+		}
+
+		return matches;
+	}
+
 }

core/src/test/java/org/hibernate/engine/query/ParameterParserTest.java

@@ -0,0 +1,39 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Middleware LLC.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ *
+ */
+package org.hibernate.engine.query;
+
+import junit.framework.TestCase;
+
+/**
+ * Unit tests of the ParameterParser class
+ *
+ * @author Steve Ebersole
+ */
+public class ParameterParserTest extends TestCase {
+	public void testEscapeCallRecognition() {
+		assertTrue( ParameterParser.startsWithEscapeCallTemplate( "{ ? = call abc(?) }" ) );
+		assertFalse( ParameterParser.startsWithEscapeCallTemplate( "from User u where u.userName = ? and u.userType = 'call'" ) );
+	}
+}