author | chegar |
Mon, 18 Aug 2014 10:59:36 +0100 | |
changeset 25991 | e48157b42439 |
parent 25976 | jdk/src/share/classes/javax/sql/rowset/RowSetProvider.java@4de01a56e3ee |
parent 25859 | jdk/src/share/classes/javax/sql/rowset/RowSetProvider.java@3317bb8137f4 |
child 36511 | 9d0388c6b336 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package javax.sql.rowset; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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import java.sql.SQLException; |
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import java.util.PropertyPermission; |
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import java.util.ServiceConfigurationError; |
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import java.util.ServiceLoader; |
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import javax.sql.rowset.spi.SyncFactoryException; |
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import sun.reflect.misc.ReflectUtil; |
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/** |
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* A factory API that enables applications to obtain a |
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* {@code RowSetFactory} implementation that can be used to create different |
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* types of {@code RowSet} implementations. |
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* <p> |
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* Example: |
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* </p> |
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* <pre> |
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* RowSetFactory aFactory = RowSetProvider.newFactory(); |
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* CachedRowSet crs = aFactory.createCachedRowSet(); |
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* ... |
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* RowSetFactory rsf = RowSetProvider.newFactory("com.sun.rowset.RowSetFactoryImpl", null); |
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* WebRowSet wrs = rsf.createWebRowSet(); |
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* </pre> |
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*<p> |
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* Tracing of this class may be enabled by setting the System property |
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* {@code javax.sql.rowset.RowSetFactory.debug} to any value but {@code false}. |
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* </p> |
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* |
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* @author Lance Andersen |
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* @since 1.7 |
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*/ |
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public class RowSetProvider { |
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private static final String ROWSET_DEBUG_PROPERTY = "javax.sql.rowset.RowSetProvider.debug"; |
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private static final String ROWSET_FACTORY_IMPL = "com.sun.rowset.RowSetFactoryImpl"; |
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private static final String ROWSET_FACTORY_NAME = "javax.sql.rowset.RowSetFactory"; |
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/** |
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* Internal debug flag. |
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*/ |
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private static boolean debug = true; |
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static { |
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// Check to see if the debug property is set |
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String val = getSystemProperty(ROWSET_DEBUG_PROPERTY); |
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// Allow simply setting the prop to turn on debug |
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debug = val != null && !"false".equals(val); |
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} |
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/** |
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* RowSetProvider constructor |
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*/ |
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protected RowSetProvider () { |
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} |
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/** |
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* <p>Creates a new instance of a <code>RowSetFactory</code> |
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* implementation. This method uses the following |
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* look up order to determine |
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* the <code>RowSetFactory</code> implementation class to load:</p> |
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* <ul> |
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* <li> |
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* The System property {@code javax.sql.rowset.RowSetFactory}. For example: |
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* <ul> |
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* <li> |
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* -Djavax.sql.rowset.RowSetFactory=com.sun.rowset.RowSetFactoryImpl |
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* </li> |
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* </ul> |
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* <li> |
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* The {@link ServiceLoader} API. The {@code ServiceLoader} API will look |
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* for a class name in the file |
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* {@code META-INF/services/javax.sql.rowset.RowSetFactory} |
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* in jars available to the runtime. For example, to have the RowSetFactory |
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* implementation {@code com.sun.rowset.RowSetFactoryImpl } loaded, the |
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* entry in {@code META-INF/services/javax.sql.rowset.RowSetFactory} would be: |
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* <ul> |
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* <li> |
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* {@code com.sun.rowset.RowSetFactoryImpl } |
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* </li> |
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* </ul> |
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* </li> |
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* <li> |
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* Platform default <code>RowSetFactory</code> instance. |
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* </li> |
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* </ul> |
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* |
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* <p>Once an application has obtained a reference to a {@code RowSetFactory}, |
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* it can use the factory to obtain RowSet instances.</p> |
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* |
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* @return New instance of a <code>RowSetFactory</code> |
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* |
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* @throws SQLException if the default factory class cannot be loaded, |
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* instantiated. The cause will be set to actual Exception |
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* |
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* @see ServiceLoader |
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* @since 1.7 |
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*/ |
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public static RowSetFactory newFactory() |
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throws SQLException { |
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// Use the system property first |
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RowSetFactory factory = null; |
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String factoryClassName = null; |
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try { |
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trace("Checking for Rowset System Property..."); |
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factoryClassName = getSystemProperty(ROWSET_FACTORY_NAME); |
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if (factoryClassName != null) { |
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trace("Found system property, value=" + factoryClassName); |
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factory = (RowSetFactory) ReflectUtil.newInstance(getFactoryClass(factoryClassName, null, true)); |
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} |
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} catch (Exception e) { |
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throw new SQLException( "RowSetFactory: " + factoryClassName + |
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" could not be instantiated: ", e); |
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} |
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// Check to see if we found the RowSetFactory via a System property |
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if (factory == null) { |
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// If the RowSetFactory is not found via a System Property, now |
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// look it up via the ServiceLoader API and if not found, use the |
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// Java SE default. |
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factory = loadViaServiceLoader(); |
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factory = |
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factory == null ? newFactory(ROWSET_FACTORY_IMPL, null) : factory; |
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} |
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return (factory); |
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} |
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/** |
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* <p>Creates a new instance of a <code>RowSetFactory</code> from the |
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* specified factory class name. |
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* This function is useful when there are multiple providers in the classpath. |
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* It gives more control to the application as it can specify which provider |
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* should be loaded.</p> |
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* |
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* <p>Once an application has obtained a reference to a <code>RowSetFactory</code> |
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* it can use the factory to obtain RowSet instances.</p> |
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* |
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* @param factoryClassName fully qualified factory class name that |
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* provides an implementation of <code>javax.sql.rowset.RowSetFactory</code>. |
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* |
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* @param cl <code>ClassLoader</code> used to load the factory |
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* class. If <code>null</code> current <code>Thread</code>'s context |
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* classLoader is used to load the factory class. |
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* |
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* @return New instance of a <code>RowSetFactory</code> |
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* |
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* @throws SQLException if <code>factoryClassName</code> is |
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* <code>null</code>, or the factory class cannot be loaded, instantiated. |
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* |
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* @see #newFactory() |
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* |
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* @since 1.7 |
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*/ |
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public static RowSetFactory newFactory(String factoryClassName, ClassLoader cl) |
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throws SQLException { |
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trace("***In newInstance()"); |
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if(factoryClassName == null) { |
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throw new SQLException("Error: factoryClassName cannot be null"); |
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} |
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try { |
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ReflectUtil.checkPackageAccess(factoryClassName); |
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} catch (java.security.AccessControlException e) { |
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throw new SQLException("Access Exception",e); |
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} |
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try { |
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Class<?> providerClass = getFactoryClass(factoryClassName, cl, false); |
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RowSetFactory instance = (RowSetFactory) providerClass.newInstance(); |
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if (debug) { |
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trace("Created new instance of " + providerClass + |
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" using ClassLoader: " + cl); |
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} |
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return instance; |
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} catch (ClassNotFoundException x) { |
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throw new SQLException( |
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"Provider " + factoryClassName + " not found", x); |
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} catch (Exception x) { |
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throw new SQLException( |
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"Provider " + factoryClassName + " could not be instantiated: " + x, |
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x); |
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} |
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} |
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/* |
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* Returns the class loader to be used. |
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* @return The ClassLoader to use. |
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* |
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*/ |
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static private ClassLoader getContextClassLoader() throws SecurityException { |
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return AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() { |
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public ClassLoader run() { |
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ClassLoader cl = null; |
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cl = Thread.currentThread().getContextClassLoader(); |
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if (cl == null) { |
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cl = ClassLoader.getSystemClassLoader(); |
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} |
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return cl; |
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} |
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}); |
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} |
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/** |
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* Attempt to load a class using the class loader supplied. If that fails |
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* and fall back is enabled, the current (i.e. bootstrap) class loader is |
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* tried. |
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* |
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* If the class loader supplied is <code>null</code>, first try using the |
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* context class loader followed by the current class loader. |
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* @return The class which was loaded |
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*/ |
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static private Class<?> getFactoryClass(String factoryClassName, ClassLoader cl, |
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boolean doFallback) throws ClassNotFoundException { |
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try { |
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if (cl == null) { |
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cl = getContextClassLoader(); |
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if (cl == null) { |
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throw new ClassNotFoundException(); |
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} else { |
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return cl.loadClass(factoryClassName); |
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} |
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} else { |
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return cl.loadClass(factoryClassName); |
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} |
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} catch (ClassNotFoundException e) { |
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if (doFallback) { |
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// Use current class loader |
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return Class.forName(factoryClassName, true, RowSetFactory.class.getClassLoader()); |
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} else { |
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throw e; |
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} |
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} |
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} |
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/** |
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* Use the ServiceLoader mechanism to load the default RowSetFactory |
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* @return default RowSetFactory Implementation |
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*/ |
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static private RowSetFactory loadViaServiceLoader() throws SQLException { |
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RowSetFactory theFactory = null; |
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try { |
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trace("***in loadViaServiceLoader():"); |
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for (RowSetFactory factory : ServiceLoader.load(javax.sql.rowset.RowSetFactory.class)) { |
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trace(" Loading done by the java.util.ServiceLoader :" + factory.getClass().getName()); |
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theFactory = factory; |
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break; |
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278 |
} |
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} catch (ServiceConfigurationError e) { |
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throw new SQLException( |
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"RowSetFactory: Error locating RowSetFactory using Service " |
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+ "Loader API: " + e, e); |
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} |
284 |
return theFactory; |
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285 |
||
286 |
} |
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287 |
||
288 |
/** |
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289 |
* Returns the requested System Property. If a {@code SecurityException} |
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* occurs, just return NULL |
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* @param propName - System property to retrieve |
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* @return The System property value or NULL if the property does not exist |
293 |
* or a {@code SecurityException} occurs. |
|
294 |
*/ |
|
295 |
static private String getSystemProperty(final String propName) { |
|
296 |
String property = null; |
|
297 |
try { |
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property = AccessController.doPrivileged(new PrivilegedAction<String>() { |
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300 |
public String run() { |
6529 | 301 |
return System.getProperty(propName); |
302 |
} |
|
23914 | 303 |
}, null, new PropertyPermission(propName, "read")); |
6529 | 304 |
} catch (SecurityException se) { |
23914 | 305 |
trace("error getting " + propName + ": "+ se); |
6529 | 306 |
if (debug) { |
307 |
se.printStackTrace(); |
|
308 |
} |
|
309 |
} |
|
310 |
return property; |
|
311 |
} |
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312 |
||
313 |
/** |
|
314 |
* Debug routine which will output tracing if the System Property |
|
315 |
* -Djavax.sql.rowset.RowSetFactory.debug is set |
|
316 |
* @param msg - The debug message to display |
|
317 |
*/ |
|
318 |
private static void trace(String msg) { |
|
319 |
if (debug) { |
|
320 |
System.err.println("###RowSets: " + msg); |
|
321 |
} |
|
322 |
} |
|
323 |
} |