HHH-12511 Make ASTPrinter threadsafe and have code reuse their instances

hibernate-core/src/main/java/org/hibernate/hql/internal/ast/HqlParser.java

@@ -20,6 +20,7 @@ import org.hibernate.hql.internal.antlr.HqlBaseParser;
 import org.hibernate.hql.internal.antlr.HqlTokenTypes;
 import org.hibernate.hql.internal.ast.util.ASTPrinter;
 import org.hibernate.hql.internal.ast.util.ASTUtil;
+import org.hibernate.hql.internal.ast.util.TokenPrinters;
 import org.hibernate.internal.CoreLogging;
 import org.hibernate.internal.CoreMessageLogger;
 import org.hibernate.internal.util.StringHelper;
@@ -41,11 +42,6 @@ public final class HqlParser extends HqlBaseParser {
 	private static final CoreMessageLogger LOG = CoreLogging.messageLogger( HqlParser.class );
 
 	private final ParseErrorHandler parseErrorHandler;
-	private final ASTPrinter printer = getASTPrinter();
-
-	private static ASTPrinter getASTPrinter() {
-		return new ASTPrinter( org.hibernate.hql.internal.antlr.HqlTokenTypes.class );
-	}
 
 	/**
 	 * Get a HqlParser instance for the given HQL string.
@@ -362,7 +358,7 @@ public final class HqlParser extends HqlBaseParser {
 	}
 
 	private void showAst(AST ast, PrintWriter pw) {
-		printer.showAst( ast, pw );
+		TokenPrinters.HQL_TOKEN_PRINTER.showAst( ast, pw );
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/hql/internal/ast/HqlSqlWalker.java

@@ -65,6 +65,7 @@ import org.hibernate.hql.internal.ast.util.LiteralProcessor;
 import org.hibernate.hql.internal.ast.util.NodeTraverser;
 import org.hibernate.hql.internal.ast.util.SessionFactoryHelper;
 import org.hibernate.hql.internal.ast.util.SyntheticAndFactory;
+import org.hibernate.hql.internal.ast.util.TokenPrinters;
 import org.hibernate.hql.spi.QueryTranslator;
 import org.hibernate.id.BulkInsertionCapableIdentifierGenerator;
 import org.hibernate.id.IdentifierGenerator;
@@ -118,7 +119,6 @@ public class HqlSqlWalker extends HqlSqlBaseWalker implements ErrorReporter, Par
 	private final AliasGenerator aliasGenerator = new AliasGenerator();
 	private final LiteralProcessor literalProcessor;
 	private final ParseErrorHandler parseErrorHandler;
-	private final ASTPrinter printer;
 	private final String collectionFilterRole;
 
 	private FromClause currentFromClause;
@@ -171,7 +171,6 @@ public class HqlSqlWalker extends HqlSqlBaseWalker implements ErrorReporter, Par
 		this.tokenReplacements = tokenReplacements;
 		this.collectionFilterRole = collectionRole;
 		this.hqlParser = parser;
-		this.printer = new ASTPrinter( SqlTokenTypes.class );
 	}
 
 	// handle trace logging ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -194,7 +193,7 @@ public class HqlSqlWalker extends HqlSqlBaseWalker implements ErrorReporter, Par
 	private String buildTraceNodeName(AST tree) {
 		return tree == null
 				? "???"
-				: tree.getText() + " [" + printer.getTokenTypeName( tree.getType() ) + "]";
+				: tree.getText() + " [" + TokenPrinters.SQL_TOKEN_PRINTER.getTokenTypeName( tree.getType() ) + "]";
 	}
 
 	@Override
@@ -1337,7 +1336,7 @@ public class HqlSqlWalker extends HqlSqlBaseWalker implements ErrorReporter, Par
 	}
 
 	public ASTPrinter getASTPrinter() {
-		return printer;
+		return TokenPrinters.SQL_TOKEN_PRINTER;
 	}
 
 	public ArrayList<ParameterSpecification> getParameterSpecs() {

hibernate-core/src/main/java/org/hibernate/hql/internal/ast/QueryTranslatorImpl.java

@@ -42,6 +42,7 @@ import org.hibernate.hql.internal.ast.tree.UpdateStatement;
 import org.hibernate.hql.internal.ast.util.ASTPrinter;
 import org.hibernate.hql.internal.ast.util.ASTUtil;
 import org.hibernate.hql.internal.ast.util.NodeTraverser;
+import org.hibernate.hql.internal.ast.util.TokenPrinters;
 import org.hibernate.hql.spi.FilterTranslator;
 import org.hibernate.hql.spi.ParameterTranslations;
 import org.hibernate.internal.CoreMessageLogger;
@@ -262,8 +263,6 @@ public class QueryTranslatorImpl implements FilterTranslator {
 		}
 	}
 
-	private static final ASTPrinter SQL_TOKEN_PRINTER = new ASTPrinter( SqlTokenTypes.class );
-
 	private HqlSqlWalker analyze(HqlParser parser, String collectionRole) throws QueryException, RecognitionException {
 		final HqlSqlWalker w = new HqlSqlWalker( this, factory, parser, tokenReplacements, collectionRole );
 		final AST hqlAst = parser.getAST();
@@ -272,7 +271,7 @@ public class QueryTranslatorImpl implements FilterTranslator {
 		w.statement( hqlAst );
 
 		if ( LOG.isDebugEnabled() ) {
-			LOG.debug( SQL_TOKEN_PRINTER.showAsString( w.getAST(), "--- SQL AST ---" ) );
+			LOG.debug( TokenPrinters.SQL_TOKEN_PRINTER.showAsString( w.getAST(), "--- SQL AST ---" ) );
 		}
 
 		w.getParseErrorHandler().throwQueryException();
@@ -304,11 +303,9 @@ public class QueryTranslatorImpl implements FilterTranslator {
 		return parser;
 	}
 
-	private static final ASTPrinter HQL_TOKEN_PRINTER = new ASTPrinter( HqlTokenTypes.class );
-
 	void showHqlAst(AST hqlAst) {
 		if ( LOG.isDebugEnabled() ) {
-			LOG.debug( HQL_TOKEN_PRINTER.showAsString( hqlAst, "--- HQL AST ---" ) );
+			LOG.debug( TokenPrinters.HQL_TOKEN_PRINTER.showAsString( hqlAst, "--- HQL AST ---" ) );
 		}
 	}
 

hibernate-core/src/main/java/org/hibernate/hql/internal/ast/SqlGenerator.java

@@ -23,6 +23,7 @@ import org.hibernate.hql.internal.ast.tree.Node;
 import org.hibernate.hql.internal.ast.tree.ParameterContainer;
 import org.hibernate.hql.internal.ast.tree.ParameterNode;
 import org.hibernate.hql.internal.ast.util.ASTPrinter;
+import org.hibernate.hql.internal.ast.util.TokenPrinters;
 import org.hibernate.internal.CoreLogging;
 import org.hibernate.internal.CoreMessageLogger;
 import org.hibernate.internal.util.StringHelper;
@@ -57,7 +58,6 @@ public class SqlGenerator extends SqlGeneratorBase implements ErrorReporter {
 	private ParseErrorHandler parseErrorHandler;
 	private SessionFactoryImplementor sessionFactory;
 	private LinkedList<SqlWriter> outputStack = new LinkedList<SqlWriter>();
-	private final ASTPrinter printer = new ASTPrinter( SqlTokenTypes.class );
 	private List<ParameterSpecification> collectedParameters = new ArrayList<ParameterSpecification>();
 
 
@@ -81,7 +81,7 @@ public class SqlGenerator extends SqlGeneratorBase implements ErrorReporter {
 	private String buildTraceNodeName(AST tree) {
 		return tree == null
 				? "???"
-				: tree.getText() + " [" + printer.getTokenTypeName( tree.getType() ) + "]";
+				: tree.getText() + " [" + TokenPrinters.SQL_TOKEN_PRINTER.getTokenTypeName( tree.getType() ) + "]";
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/hql/internal/ast/tree/SelectClause.java

@@ -16,6 +16,7 @@ import org.hibernate.hql.internal.antlr.SqlTokenTypes;
 import org.hibernate.hql.internal.ast.util.ASTAppender;
 import org.hibernate.hql.internal.ast.util.ASTIterator;
 import org.hibernate.hql.internal.ast.util.ASTPrinter;
+import org.hibernate.hql.internal.ast.util.TokenPrinters;
 import org.hibernate.type.Type;
 
 import antlr.SemanticException;
@@ -157,7 +158,7 @@ public class SelectClause extends SelectExpressionList {
 				if ( type == null ) {
 					throw new QueryException(
 							"No data type for node: " + selectExpression.getClass().getName() + " "
-									+ new ASTPrinter( SqlTokenTypes.class ).showAsString( (AST) selectExpression, "" )
+									+ TokenPrinters.SQL_TOKEN_PRINTER.showAsString( (AST) selectExpression, "" )
 					);
 				}
 				//sqlResultTypeList.add( type );

hibernate-core/src/main/java/org/hibernate/hql/internal/ast/tree/SelectExpressionList.java

@@ -11,6 +11,7 @@ import java.util.List;
 
 import org.hibernate.hql.internal.antlr.SqlTokenTypes;
 import org.hibernate.hql.internal.ast.util.ASTPrinter;
+import org.hibernate.hql.internal.ast.util.TokenPrinters;
 
 import antlr.collections.AST;
 
@@ -44,7 +45,7 @@ public abstract class SelectExpressionList extends HqlSqlWalkerNode {
 			else {
 				throw new IllegalStateException(
 						"Unexpected AST: " + n.getClass().getName() + " "
-								+ new ASTPrinter( SqlTokenTypes.class ).showAsString( n, "" )
+								+ TokenPrinters.SQL_TOKEN_PRINTER.showAsString( n, "" )
 				);
 			}
 			p++;

hibernate-core/src/main/java/org/hibernate/hql/internal/ast/util/ASTPrinter.java

@@ -20,52 +20,24 @@ import antlr.collections.AST;
 /**
  * Utility for generating pretty "ASCII art" representations of syntax trees.
  *
+ * This class is threadsafe: reuse instances as needed.
+ *
  * @author Joshua Davis
  * @author Steve Ebersole
  */
 public class ASTPrinter {
+
 	private final Map<Integer,String> tokenTypeNameCache;
-	private final boolean showClassNames;
 
 	/**
-	 * Constructs a printer.
+	 * Constructs a printer. Package protected: use the constants from {TokenPrinters}
-	 * <p/>
+	 * @see TokenPrinters
-	 * Delegates to {@link #ASTPrinter(Class, boolean)} with {@link #isShowClassNames showClassNames} as <tt>true</tt>
 	 *
 	 * @param tokenTypeConstants The token types to use during printing; typically the {vocabulary}TokenTypes.java
 	 * interface generated by ANTLR.
 	 */
-	public ASTPrinter(Class tokenTypeConstants) {
+	ASTPrinter(Class tokenTypeConstants) {
-		this( ASTUtil.generateTokenNameCache( tokenTypeConstants ), true );
+		this.tokenTypeNameCache = ASTUtil.generateTokenNameCache( tokenTypeConstants );
-	}
-
-	public ASTPrinter(boolean showClassNames) {
-		this( (Map) null, showClassNames );
-	}
-
-	/**
-	 * Constructs a printer.
-	 *
-	 * @param tokenTypeConstants The token types to use during printing; typically the {vocabulary}TokenTypes.java
-	 * interface generated by ANTLR.
-	 * @param showClassNames Should the AST class names be shown.
-	 */
-	public ASTPrinter(Class tokenTypeConstants, boolean showClassNames) {
-		this( ASTUtil.generateTokenNameCache( tokenTypeConstants ), showClassNames );
-	}
-
-	private ASTPrinter(Map<Integer,String> tokenTypeNameCache, boolean showClassNames) {
-		this.tokenTypeNameCache = tokenTypeNameCache;
-		this.showClassNames = showClassNames;
-	}
-
-	/**
-	 * Getter for property 'showClassNames'.
-	 *
-	 * @return Value for property 'showClassNames'.
-	 */
-	public boolean isShowClassNames() {
-		return showClassNames;
 	}
 
 	/**
@@ -117,10 +89,7 @@ public class ASTPrinter {
 	 */
 	public String getTokenTypeName(int type) {
 		final Integer typeInteger = type;
-		String value = null;
+		String value = tokenTypeNameCache.get( typeInteger );
-		if ( tokenTypeNameCache != null ) {
-			value = tokenTypeNameCache.get( typeInteger );
-		}
 		if ( value == null ) {
 			value = typeInteger.toString();
 		}
@@ -161,19 +130,17 @@ public class ASTPrinter {
 	}
 
 	private void showNode(PrintWriter pw, AST ast) {
-		String s = nodeToString( ast, isShowClassNames() );
+		String s = nodeToString( ast );
 		pw.println( s );
 	}
 
-	public String nodeToString(AST ast, boolean showClassName) {
+	public String nodeToString(AST ast) {
 		if ( ast == null ) {
 			return "{node:null}";
 		}
 		StringBuilder buf = new StringBuilder();
 		buf.append( "[" ).append( getTokenTypeName( ast.getType() ) ).append( "] " );
-		if ( showClassName ) {
 		buf.append( StringHelper.unqualify( ast.getClass().getName() ) ).append( ": " );
-		}
 
 		buf.append( "'" );
 		String text = ast.getText();

hibernate-core/src/main/java/org/hibernate/hql/internal/ast/util/TokenPrinters.java

@@ -0,0 +1,24 @@
+/*
+ * 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 <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.hql.internal.ast.util;
+
+import org.hibernate.hql.internal.antlr.HqlTokenTypes;
+import org.hibernate.hql.internal.antlr.SqlTokenTypes;
+import org.hibernate.sql.ordering.antlr.GeneratedOrderByFragmentRendererTokenTypes;
+
+/**
+ * Commonly used token printers expressed as constants.
+ */
+public interface TokenPrinters {
+
+	ASTPrinter HQL_TOKEN_PRINTER = new ASTPrinter( HqlTokenTypes.class );
+
+	ASTPrinter SQL_TOKEN_PRINTER = new ASTPrinter( SqlTokenTypes.class );
+
+	ASTPrinter ORDERBY_FRAGMENT_PRINTER = new ASTPrinter( GeneratedOrderByFragmentRendererTokenTypes.class );
+
+}

hibernate-core/src/main/java/org/hibernate/sql/ordering/antlr/OrderByFragmentRenderer.java

@@ -9,6 +9,7 @@ package org.hibernate.sql.ordering.antlr;
 import org.hibernate.NullPrecedence;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
 import org.hibernate.hql.internal.ast.util.ASTPrinter;
+import org.hibernate.hql.internal.ast.util.TokenPrinters;
 import org.hibernate.internal.util.StringHelper;
 
 import org.jboss.logging.Logger;
@@ -25,7 +26,6 @@ import antlr.collections.AST;
 public class OrderByFragmentRenderer extends GeneratedOrderByFragmentRenderer {
 
 	private static final Logger LOG = Logger.getLogger( OrderByFragmentRenderer.class.getName() );
-	private static final ASTPrinter printer = new ASTPrinter( GeneratedOrderByFragmentRendererTokenTypes.class );
 
 	private final SessionFactoryImplementor sessionFactory;
 
@@ -56,7 +56,7 @@ public class OrderByFragmentRenderer extends GeneratedOrderByFragmentRenderer {
 	private String buildTraceNodeName(AST tree) {
 		return tree == null
 				? "???"
-				: tree.getText() + " [" + printer.getTokenTypeName( tree.getType() ) + "]";
+				: tree.getText() + " [" + TokenPrinters.ORDERBY_FRAGMENT_PRINTER.getTokenTypeName( tree.getType() ) + "]";
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/sql/ordering/antlr/OrderByFragmentTranslator.java

@@ -11,6 +11,7 @@ import java.util.Set;
 
 import org.hibernate.HibernateException;
 import org.hibernate.hql.internal.ast.util.ASTPrinter;
+import org.hibernate.hql.internal.ast.util.TokenPrinters;
 
 import org.jboss.logging.Logger;
 
@@ -55,8 +56,7 @@ public class OrderByFragmentTranslator {
 		}
 
 		if ( LOG.isTraceEnabled() ) {
-			ASTPrinter printer = new ASTPrinter( OrderByTemplateTokenTypes.class );
+			LOG.trace( TokenPrinters.ORDERBY_FRAGMENT_PRINTER.showAsString( parser.getAST(), "--- {order-by fragment} ---" ) );
-			LOG.trace( printer.showAsString( parser.getAST(), "--- {order-by fragment} ---" ) );
 		}
 
 		// Render the parsed tree to text.

hibernate-core/src/test/java/org/hibernate/test/ast/ASTIteratorTest.java

@@ -18,6 +18,8 @@ import org.hibernate.hql.internal.ast.util.ASTIterator;
 import org.hibernate.hql.internal.ast.util.ASTParentsFirstIterator;
 import org.hibernate.hql.internal.ast.util.ASTPrinter;
 import org.hibernate.hql.internal.ast.util.ASTUtil;
+import org.hibernate.hql.internal.ast.util.TokenPrinters;
+
 import org.hibernate.testing.junit4.BaseUnitTestCase;
 
 import static org.junit.Assert.assertEquals;
@@ -36,7 +38,7 @@ public class ASTIteratorTest extends BaseUnitTestCase {
 		HqlParser parser = HqlParser.getInstance( input );
 		parser.statement();
 		AST ast = parser.getAST();
-		ASTPrinter printer = new ASTPrinter( HqlTokenTypes.class );
+		ASTPrinter printer = TokenPrinters.HQL_TOKEN_PRINTER;
 		printer.showAst( ast, new PrintWriter( System.out ) );
 		ASTIterator iterator = new ASTIterator( ast );
 		int count = 0;