| 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_Connection; |
| 24 | import static sf.qof.codegen.Constants.TYPE_RuntimeException; |
| 25 | |
| 26 | import java.lang.reflect.Method; |
| 27 | import java.lang.reflect.Modifier; |
| 28 | |
| 29 | import net.sf.cglib.core.ClassEmitter; |
| 30 | import net.sf.cglib.core.CodeEmitter; |
| 31 | import net.sf.cglib.core.Constants; |
| 32 | |
| 33 | /** |
| 34 | * Provides the default implementation of a ConnectionFactoryCustomizer. |
| 35 | * |
| 36 | * This customizer implements getConnection() and setConnection() methods and |
| 37 | * a private field to store it if the super class does not have a <code>getConnection()</code> |
| 38 | * method defined. |
| 39 | * |
| 40 | * @see ConnectionFactoryCustomizer |
| 41 | */ |
| 42 | public class DefaultConnectionFactoryCustomizer implements ConnectionFactoryCustomizer { |
| 43 | |
| 44 | private static final String FIELD_NAME_CONNECTION = "$connection"; |
| 45 | |
| 46 | public void emitFields(Class<?> queryDefinitionClass, Class<?> superClass, ClassEmitter ce) { |
| 47 | if (!methodExists(superClass, "getConnection", null)) { |
| 48 | ce.declare_field(Constants.ACC_PRIVATE, FIELD_NAME_CONNECTION, TYPE_Connection, null, null); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | public void emitGetConnection(Class<?> queryDefinitionClass, Class<?> superClass, ClassEmitter ce) { |
| 53 | if (!methodExists(superClass, "getConnection", null)) { |
| 54 | CodeEmitter co = ce.begin_method(Constants.ACC_PUBLIC, SIG_getConnection, null, null); |
| 55 | co.load_this(); |
| 56 | co.getfield(FIELD_NAME_CONNECTION); |
| 57 | co.return_value(); |
| 58 | co.end_method(); |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | public void emitSetConnection(Class<?> queryDefinitionClass, Class<?> superClass, ClassEmitter ce) { |
| 63 | if (!methodExists(superClass, "getConnection", null)) { |
| 64 | CodeEmitter co = ce.begin_method(Constants.ACC_PUBLIC, SIG_setConnection, null, null); |
| 65 | co.load_this(); |
| 66 | co.load_arg(0); |
| 67 | co.putfield(FIELD_NAME_CONNECTION); |
| 68 | co.return_value(); |
| 69 | co.end_method(); |
| 70 | } else if (!methodExists(superClass, "setConnection", new Class<?>[] {java.sql.Connection.class})) { |
| 71 | CodeEmitter co = ce.begin_method(Constants.ACC_PUBLIC, SIG_setConnection, null, null); |
| 72 | co.throw_exception(TYPE_RuntimeException, "Connection cannot be set"); |
| 73 | co.end_method(); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | private boolean methodExists(Class<?> superClass, String methodName, Class<?>[] parameterTypes) { |
| 78 | try { |
| 79 | Method method = superClass.getMethod(methodName, parameterTypes); |
| 80 | int modifiers = method.getModifiers(); |
| 81 | if (Modifier.isPrivate(modifiers) || Modifier.isAbstract(modifiers)) { |
| 82 | return false; |
| 83 | } |
| 84 | if (method.getReturnType() != java.sql.Connection.class) { |
| 85 | return false; |
| 86 | } |
| 87 | return true; |
| 88 | } catch (SecurityException e) { |
| 89 | } catch (NoSuchMethodException e) { |
| 90 | } |
| 91 | return false; |
| 92 | } |
| 93 | } |