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Hibernate example source code file (Mocks.java)

This example Hibernate source code file (Mocks.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Hibernate tags/keywords

class, connection, connection, connectionhandler, databasemetadata, databasemetadata, databasemetadatahandler, databasemetadatahandler, invocationhandler, jdbc, method, object, object, reflection, sql, string, throwable

The Hibernate Mocks.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008-2011, Red Hat Inc. 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 Inc.
 *
 * 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.dialect;
import javax.persistence.criteria.CriteriaBuilder;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;

/**
 * @author Steve Ebersole
 */
@SuppressWarnings( {"UnnecessaryBoxing"})
public class Mocks {

	public static Connection createConnection(String databaseName, int majorVersion) {
		return createConnection( databaseName, majorVersion, -9999 );
	}

	public static Connection createConnection(String databaseName, int majorVersion, int minorVersion) {
		DatabaseMetaDataHandler metadataHandler = new DatabaseMetaDataHandler( databaseName, majorVersion, minorVersion );
		ConnectionHandler connectionHandler = new ConnectionHandler();

		DatabaseMetaData metadataProxy = ( DatabaseMetaData ) Proxy.newProxyInstance(
				ClassLoader.getSystemClassLoader(),
				new Class[] { DatabaseMetaData.class },
				metadataHandler
		);

		Connection connectionProxy = ( Connection ) Proxy.newProxyInstance(
				ClassLoader.getSystemClassLoader(),
				new Class[] { Connection.class },
				connectionHandler
		);

		metadataHandler.setConnectionProxy( connectionProxy );
		connectionHandler.setMetadataProxy( metadataProxy );

		return connectionProxy;
	}

	private static class ConnectionHandler implements InvocationHandler {
		private DatabaseMetaData metadataProxy;

		public void setMetadataProxy(DatabaseMetaData metadataProxy) {
			this.metadataProxy = metadataProxy;
		}

		public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
			final String methodName = method.getName();
			if ( "getMetaData".equals( methodName ) ) {
				return metadataProxy;
			}

			if ( "toString".equals( methodName ) ) {
				return "Connection proxy [@" + hashCode() + "]";
			}

			if ( "hashCode".equals( methodName ) ) {
				return Integer.valueOf( this.hashCode() );
			}

			if ( canThrowSQLException( method ) ) {
				throw new SQLException();
			}
			else {
				throw new UnsupportedOperationException();
			}
		}
	}

	private static class DatabaseMetaDataHandler implements InvocationHandler {
		private final String databaseName;
		private final int majorVersion;
		private final int minorVersion;

		private Connection connectionProxy;

		public void setConnectionProxy(Connection connectionProxy) {
			this.connectionProxy = connectionProxy;
		}

		private DatabaseMetaDataHandler(String databaseName, int majorVersion) {
			this( databaseName, majorVersion, -9999 );
		}

		private DatabaseMetaDataHandler(String databaseName, int majorVersion, int minorVersion) {
			this.databaseName = databaseName;
			this.majorVersion = majorVersion;
			this.minorVersion = minorVersion;
		}

		public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
			final String methodName = method.getName();
			if ( "getDatabaseProductName".equals( methodName ) ) {
				return databaseName;
			}

			if ( "getDatabaseMajorVersion".equals( methodName ) ) {
				return Integer.valueOf( majorVersion );
			}

			if ( "getDatabaseMinorVersion".equals( methodName ) ) {
				return Integer.valueOf( minorVersion );
			}

			if ( "getConnection".equals( methodName ) ) {
				return connectionProxy;
			}

			if ( "toString".equals( methodName ) ) {
				return "DatabaseMetaData proxy [db-name=" + databaseName + ", version=" + majorVersion + "]";
			}

			if ( "hashCode".equals( methodName ) ) {
				return new Integer( this.hashCode() );
			}

			if ( canThrowSQLException( method ) ) {
				throw new SQLException();
			}
			else {
				throw new UnsupportedOperationException();
			}
		}
	}

	private static boolean canThrowSQLException(Method method) {
		final Class[] exceptions = method.getExceptionTypes();
		for ( Class exceptionType : exceptions ) {
			if ( SQLException.class.isAssignableFrom( exceptionType ) ) {
				return true;
			}
		}
		return false;
	}
}

Other Hibernate examples (source code examples)

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