| 1 | /* |
| 2 | * Copyright 2007 brunella ltd |
| 3 | * |
| 4 | * Licensed under the LGPL Version 3 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * |
| 7 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 8 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 9 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 10 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 11 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 12 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 13 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 14 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 15 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 16 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| 17 | * THE POSSIBILITY OF SUCH DAMAGE. |
| 18 | */ |
| 19 | package sf.qof.customizer; |
| 20 | |
| 21 | import static sf.qof.codegen.Constants.SIG_getConnection; |
| 22 | import static sf.qof.codegen.Constants.SIG_setConnection; |
| 23 | import static sf.qof.codegen.Constants.TYPE_RuntimeException; |
| 24 | import net.sf.cglib.core.ClassEmitter; |
| 25 | import net.sf.cglib.core.CodeEmitter; |
| 26 | import net.sf.cglib.core.Constants; |
| 27 | import net.sf.cglib.core.Signature; |
| 28 | |
| 29 | import org.objectweb.asm.Type; |
| 30 | |
| 31 | import sf.qof.session.UseSessionContext; |
| 32 | |
| 33 | /** |
| 34 | * Provides the implementation of a ConnectionFactoryCustomizer to use the |
| 35 | * SessionContextFactory. |
| 36 | * |
| 37 | * This customizer implements <code>getConnection()</code> and |
| 38 | * <code>setConnection()</code> methods. It delegates calls to |
| 39 | * <code>getConnection()</code> to |
| 40 | * <code>SessionContextFactory.getContext().getConnection()</code>. Calls to |
| 41 | * <code>setConnection()</code> throws a RuntimeException. |
| 42 | * |
| 43 | * The <code>UseSessionContext</code> annotation indicates that this |
| 44 | * customizer should be used and allows to specify a session context name. |
| 45 | * |
| 46 | * @see sf.qof.session.SessionContextFactory |
| 47 | * @see sf.qof.session.UseSessionContext |
| 48 | */ |
| 49 | public class SessionContextConnectionFactoryCustomizer implements ConnectionFactoryCustomizer { |
| 50 | |
| 51 | private static final Type TYPE_SessionContextFactory = Type.getType("Lsf/qof/session/SessionContextFactory;"); |
| 52 | private static final Type TYPE_SessionContext = Type.getType("Lsf/qof/session/SessionContext;"); |
| 53 | private static final Signature SIG_getContext = new Signature("getContext", "()Lsf/qof/session/SessionContext;"); |
| 54 | private static final Signature SIG_getContextWithName = new Signature("getContext", "(Ljava/lang/String;)Lsf/qof/session/SessionContext;"); |
| 55 | |
| 56 | public void emitFields(Class<?> queryDefinitionClass, Class<?> superClass, ClassEmitter ce) { |
| 57 | // no fields needed |
| 58 | } |
| 59 | |
| 60 | public void emitGetConnection(Class<?> queryDefinitionClass, Class<?> superClass, ClassEmitter ce) { |
| 61 | CodeEmitter co = ce.begin_method(Constants.ACC_PUBLIC, SIG_getConnection, null, null); |
| 62 | if (queryDefinitionClass.isAnnotationPresent(UseSessionContext.class)) { |
| 63 | UseSessionContext sessionContextAnnotation = queryDefinitionClass.getAnnotation(UseSessionContext.class); |
| 64 | co.push(sessionContextAnnotation.name()); |
| 65 | co.invoke_static(TYPE_SessionContextFactory, SIG_getContextWithName); |
| 66 | } else { |
| 67 | co.invoke_static(TYPE_SessionContextFactory, SIG_getContext); |
| 68 | } |
| 69 | co.invoke_interface(TYPE_SessionContext, SIG_getConnection); |
| 70 | co.return_value(); |
| 71 | co.end_method(); |
| 72 | } |
| 73 | |
| 74 | public void emitSetConnection(Class<?> queryDefinitionClass, Class<?> superClass, ClassEmitter ce) { |
| 75 | CodeEmitter co = ce.begin_method(Constants.ACC_PUBLIC, SIG_setConnection, null, null); |
| 76 | co.throw_exception(TYPE_RuntimeException, "Connection cannot be set"); |
| 77 | co.end_method(); |
| 78 | } |
| 79 | |
| 80 | } |