Join the 1-day Testing & QA Summit featuring 15+ Expert Speakers.Register for FREE! Join TestMu Conference

How to use getReplicaMethodDelegationCode method of org.powermock.core.ClassReplicaCreator class

Best Powermock code snippet using org.powermock.core.ClassReplicaCreator.getReplicaMethodDelegationCode

Source:ClassReplicaCreator.java

...53        try {54            originalClassAsCtClass = classpool.get(originalClassName);55            CtMethod[] declaredMethods = originalClassAsCtClass.getDeclaredMethods();56            for (CtMethod ctMethod : declaredMethods) {57                final String code = getReplicaMethodDelegationCode(clazz, ctMethod, null);58                CtNewMethod.make(ctMethod.getReturnType(), ctMethod.getName(), ctMethod.getParameterTypes(), ctMethod.getExceptionTypes(),59                        code, newClass);60            }6162            return newClass.toClass(this.getClass().getClassLoader(), this.getClass().getProtectionDomain());63        } catch (Exception e) {64            throw new RuntimeException(e);65        }66    }6768    /**69     * Create a class that is a replica of type <code>T</code>. To allow for70     * partial mocking all calls to non-mocked methods will be delegated to the71     * <code>delegator</code>.72     * 73     * @param <T>74     *            The type of the replica class to be created.75     * @param delegator76     *            The delegator object that will be invoked to allow for partial77     *            mocking.78     * @return A replica class that can be used to duck-type an instance.79     */80    @SuppressWarnings("unchecked")81    public <T> Class<T> createInstanceReplica(T delegator) {82        if (delegator == null) {83            throw new IllegalArgumentException("delegator cannot be null");84        }85        final Class<T> clazz = (Class<T>) delegator.getClass();86        ClassPool classpool = ClassPool.getDefault();87        final String originalClassName = clazz.getName();88        CtClass originalClassAsCtClass = null;89        final CtClass newClass = classpool.makeClass(generateReplicaClassName(clazz));90        try {91            originalClassAsCtClass = classpool.get(originalClassName);9293            copyFields(originalClassAsCtClass, newClass);94            addDelegatorField(delegator, newClass);9596            CtMethod[] declaredMethods = originalClassAsCtClass.getDeclaredMethods();97            for (CtMethod ctMethod : declaredMethods) {98            	getReplicaMethodDelegationCode(delegator.getClass(), ctMethod, POWERMOCK_INSTANCE_DELEGATOR_FIELD_NAME);99                //final String code = getReplicaMethodDelegationCode(delegator.getClass(), ctMethod, POWERMOCK_INSTANCE_DELEGATOR_FIELD_NAME);100                // CtMethod make = CtNewMethod.make(ctMethod.getReturnType(),101                // ctMethod.getName(), ctMethod.getParameterTypes(), ctMethod102                // .getExceptionTypes(), code, newClass);103                CtMethod make2 = CtNewMethod.copy(ctMethod, newClass, null);104                // make2.setBody(code);105                newClass.addMethod(make2);106            }107108            CtConstructor[] declaredConstructors = originalClassAsCtClass.getDeclaredConstructors();109            for (CtConstructor ctConstructor : declaredConstructors) {110                CtConstructor copy = CtNewConstructor.copy(ctConstructor, newClass, null);111                newClass.addConstructor(copy);112            }113            return newClass.toClass(this.getClass().getClassLoader(), this.getClass().getProtectionDomain());114        } catch (Exception e) {115            throw new RuntimeException(e);116        }117    }118119    /**120     * Add a field to the replica class that holds the instance delegator. I.e.121     * if we're creating a instance replica of <code>java.lang.Long</code> this122     * methods adds a new field of type <code>delegator.getClass()</code> to the123     * replica class.124     */125    private <T> void addDelegatorField(T delegator, final CtClass replicaClass) throws CannotCompileException {126        CtField f = CtField.make(String.format("private %s %s = null;", delegator.getClass().getName(),127                POWERMOCK_INSTANCE_DELEGATOR_FIELD_NAME), replicaClass);128        replicaClass.addField(f);129    }130131    private <T> String generateReplicaClassName(final Class<T> clazz) {132        return "replica." + clazz.getName() + "$$PowerMock" + counter.getAndIncrement();133    }134135    private void copyFields(CtClass originalClassAsCtClass, final CtClass newClass) throws CannotCompileException, NotFoundException {136        CtField[] declaredFields = originalClassAsCtClass.getDeclaredFields();137        CtField[] undeclaredFields = originalClassAsCtClass.getFields();138        Set<CtField> allFields = new HashSet<CtField>();139        for (CtField ctField : declaredFields) {140            allFields.add(ctField);141        }142        for (CtField ctField : undeclaredFields) {143            allFields.add(ctField);144        }145146        for (CtField ctField : allFields) {147            CtField f = new CtField(ctField.getType(), ctField.getName(), newClass);148            newClass.addField(f);149        }150    }151152    /*153     * Invokes a instance method of the original instance. This enables partial154     * mocking of system classes.155     */156    private String getReplicaMethodDelegationCode(Class<?> clazz, CtMethod ctMethod, String classOrInstanceToDelegateTo)157            throws NotFoundException {158        StringBuilder builder = new StringBuilder();159        builder.append("{System.out.println(\"ikk\");\n");160        builder.append("java.lang.reflect.Method originalMethod = ");161        builder.append(clazz.getName());162        builder.append(".class.getDeclaredMethod(\"");163        builder.append(ctMethod.getName());164        builder.append("\", ");165        final String parametersAsString = getParametersAsString(getParameterTypes(ctMethod));166        if ("".equals(parametersAsString)) {167            builder.append("null");168        } else {169            builder.append(parametersAsString);170        }
...

getReplicaMethodDelegationCode

Using AI Code Generation

1String code = ClassReplicaCreator.getReplicaMethodDelegationCode("getReplicaMethodDelegationCode", "org.powermock.core.ClassReplicaCreator");2System.out.println(code);3String code = ClassReplicaCreator.getReplicaMethodDelegationCode("getReplicaMethodDelegationCode", "org.powermock.core.ClassReplicaCreator");4System.out.println(code);5String code = ClassReplicaCreator.getReplicaMethodDelegationCode("getReplicaMethodDelegationCode", "org.powermock.core.ClassReplicaCreator");6System.out.println(code);7String code = ClassReplicaCreator.getReplicaMethodDelegationCode("getReplicaMethodDelegationCode", "org.powermock.core.ClassReplicaCreator");8System.out.println(code);9String code = ClassReplicaCreator.getReplicaMethodDelegationCode("getReplicaMethodDelegationCode", "org.powermock.core.ClassReplicaCreator");10System.out.println(code);11String code = ClassReplicaCreator.getReplicaMethodDelegationCode("getReplicaMethodDelegationCode", "org.powermock.core.ClassReplicaCreator");12System.out.println(code);13String code = ClassReplicaCreator.getReplicaMethodDelegationCode("getReplicaMethodDelegationCode", "org.powermock.core.ClassReplicaCreator");14System.out.println(code);

getReplicaMethodDelegationCode

Using AI Code Generation

1    public static String getReplicaMethodDelegationCode(Class<?> clazz, String methodName, Class<?>[] parameterTypes, String[] parameterNames) {2        StringBuilder sb = new StringBuilder();3        sb.append("public static Object $").append(methodName).append("($$) {");4        sb.append("return org.powermock.core.ClassReplicaCreator.getReplicaMethodDelegationCode(").append(clazz.getName()).append(".class");5        sb.append(", \"").append(methodName).append("\"");6        sb.append(", new Class[] {");7        for (int i = 0; i < parameterTypes.length; i++) {8            if (i > 0) {9                sb.append(", ");10            }11            sb.append(parameterTypes[i].getName()).append(".class");12        }13        sb.append("}");14        sb.append(", new String[] {");15        for (int i = 0; i < parameterNames.length; i++) {16            if (i > 0) {17                sb.append(", ");18            }19            sb.append("\"").append(parameterNames[i]).append("\"");20        }21        sb.append("}");22        sb.append(");");23        sb.append("}");24        return sb.toString();25    }26}27package org.powermock.core;28import org.junit.Test;29import org.powermock.core.test.MockClassLoader;30import java.lang.reflect.Method;31import static org.junit.Assert.assertEquals;32public class ClassReplicaCreatorTest {33    public void should_create_delegation_code() throws Exception {34        Class<?> clazz = new MockClassLoader().loadClass(ReplicaClass.class.getName());35        Method method = clazz.getMethod("method", String.class, int.class);36        String[] parameterNames = new String[method.getParameterTypes().length];37        String delegationCode = ClassReplicaCreator.getReplicaMethodDelegationCode(clazz, method.getName(), method.getParameterTypes(), parameterNames);38        assertEquals("public static Object $method($$) {return org.powermock.core.ClassReplicaCreator.getReplicaMethodDelegationCode(org.powermock.core.ReplicaClass.class, \"method\", new Class[] {java.lang.String.class, int.class}, new String[] {\"arg0\", \"arg1\"});}", delegationCode);39    }40    public static class ReplicaClass {41        public Object method(String arg0, int arg1) {42            return null;43        }44    }45}

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.