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How to use transform method of org.powermock.core.transformers.javassist.MethodSizeMockTransformer class

Best Powermock code snippet using org.powermock.core.transformers.javassist.MethodSizeMockTransformer.transform

Source:JavassistMockTransformerChainFactory.java

...14 *   See the License for the specific language governing permissions and15 *   limitations under the License.16 *17 */18package org.powermock.core.transformers.javassist;19import org.powermock.core.transformers.MockTransformer;20import org.powermock.core.transformers.MockTransformerChain;21import org.powermock.core.transformers.MockTransformerChainFactory;22import org.powermock.core.transformers.TransformStrategy;23import org.powermock.core.transformers.support.DefaultMockTransformerChain;24import org.powermock.core.transformers.support.DefaultMockTransformerChain.MockTransformerChainBuilder;25import java.util.List;26public class JavassistMockTransformerChainFactory implements MockTransformerChainFactory {27    28    private static final TransformStrategy DEFAULT = TransformStrategy.CLASSLOADER;29    30    @Override31    public MockTransformerChain createDefaultChain() {32        return createDefaultChain(DEFAULT);33    }34    35    @Override36    public MockTransformerChain createDefaultChain(final TransformStrategy transformStrategy) {37        return createDefaultChainBuilder(transformStrategy).build();38    }39    40    @Override41    public MockTransformerChain createDefaultChain(final List<MockTransformer> extraMockTransformers) {42        return createDefaultChainBuilder(DEFAULT)43                   .append(extraMockTransformers)44                   .build();45    }46    47    @Override48    public MockTransformerChain createTestClassChain(final MockTransformer testClassTransformer) {49        return createDefaultChainBuilder(DEFAULT)50                   .append(testClassTransformer)51                   .build();52    }53    54    private MockTransformerChainBuilder createDefaultChainBuilder(final TransformStrategy transformStrategy) {55        return DefaultMockTransformerChain.newBuilder()56                                          .append(new ClassFinalModifierMockTransformer(transformStrategy))57                                          .append(new ConstructorsMockTransformer(transformStrategy))58                                          .append(new InstrumentMockTransformer(transformStrategy))59                                          .append(new PackagePrivateClassesMockTransformer(transformStrategy))60                                          .append(new StaticFinalFieldsMockTransformer(transformStrategy))61                                          .append(new StaticFinalNativeMethodMockTransformer(transformStrategy))62                                          .append(new SuppressStaticInitializerMockTransformer(transformStrategy))63                                          .append(new MethodSizeMockTransformer(transformStrategy));64    }65}...

Source:MethodSizeMockTransformer.java

...14 *   See the License for the specific language governing permissions and15 *   limitations under the License.16 *17 */18package org.powermock.core.transformers.javassist;19import javassist.CannotCompileException;20import javassist.CtClass;21import javassist.CtMethod;22import javassist.NotFoundException;23import javassist.bytecode.CodeAttribute;24import org.powermock.core.transformers.TransformStrategy;25/**26 * According to JVM specification method size must be lower than 65536 bytes.27 * When that limit is exceeded class loader will fail to load the class.28 * Since instrumentation can increase method size significantly it must be29 * ensured that JVM limit is not exceeded.30 * <p/>31 * When the limit is exceeded method's body is replaced by exception throw.32 * Method is then instrumented again to allow mocking and suppression.33 *34 * @see <a href="http://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.3">JVM specification</a>35 */36public class MethodSizeMockTransformer extends MethodMockTransformer {37    38    private static final int MAX_METHOD_CODE_LENGTH_LIMIT = 65536;39    40    public MethodSizeMockTransformer(final TransformStrategy strategy) {41        super(strategy);42    }43    44    public CtClass transform(final CtClass clazz) throws CannotCompileException, NotFoundException {45        for (CtMethod method : clazz.getDeclaredMethods()) {46            if (isMethodSizeExceeded(method)) {47                String code = "{throw new IllegalAccessException(\"" +48                                  "Method was too large and after instrumentation exceeded JVM limit. " +49                                  "PowerMock modified the method to allow JVM to load the class. " +50                                  "You can use PowerMock API to suppress or mock this method behaviour." +51                                  "\");}";52                method.setBody(code);53                modifyMethod(method);54            }55        }56        return clazz;57    }58    ...

transform

Using AI Code Generation

1package org.powermock.core.transformers.javassist;2import java.lang.instrument.IllegalClassFormatException;3import java.security.ProtectionDomain;4import javassist.ClassPool;5import javassist.CtClass;6import javassist.CtMethod;7import javassist.LoaderClassPath;8import org.powermock.core.transformers.MockTransformer;9import org.powermock.core.transformers.TransformStrategy;10public class MethodSizeMockTransformer implements MockTransformer {11    private final TransformStrategy strategy;12    public MethodSizeMockTransformer(TransformStrategy strategy) {13        this.strategy = strategy;14    }15    public byte[] transform(ClassLoader classLoader, String className, Class<?> classBeingRedefined,16            ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {17        if (classLoader == null) {18            return null;19        }20        ClassPool pool = ClassPool.getDefault();21        pool.appendClassPath(new LoaderClassPath(classLoader));22        CtClass cc = null;23        try {24            cc = pool.makeClass(new java.io.ByteArrayInputStream(classfileBuffer));25            if (cc.isFrozen()) {26                cc.defrost();27            }28            if (cc.isInterface() || cc.isAnnotation()) {29                return null;30            }31            for (CtMethod method : cc.getDeclaredMethods()) {32                if (!method.isEmpty()) {33                    method.instrument(new MethodSizeTransformer(method));34                }35            }36            return cc.toBytecode();37        } catch (Throwable t) {38            throw new IllegalClassFormatException("Unable to transform class: " + t.getMessage());39        } finally {40            if (cc != null) {41                cc.detach();42            }43        }44    }45    private class MethodSizeTransformer extends javassist.expr.ExprEditor {46        private final CtMethod method;47        public MethodSizeTransformer(CtMethod method) {48            this.method = method;49        }50        public void edit(javassist.expr.MethodCall m) throws javassist.CannotCompileException {51            try {52                if (strategy.shouldTransform(m.getClassName(), m.getMethodName())) {53                    m.replace("{" + "    $_ = ($r)org.powermock.core.transformers.impl.MethodSizeMockTransformer$MethodSizeTransformerHelper.transform(\""54                            + m.getClassName() + "\", \"" + m.getMethodName() + "\", $args, $sig, $type, $0, $class);"55                            + "}");56                }57            } catch (Throwable t) {58                throw new javassist.CannotCompileException(t);59            }

transform

Using AI Code Generation

1package org.powermock.core.transformers.javassist;2import javassist.ClassPool;3import javassist.CtClass;4import javassist.CtMethod;5import javassist.NotFoundException;6import org.junit.Test;7import org.powermock.core.transformers.MockTransformer;8import java.lang.reflect.Method;9import java.util.ArrayList;10import java.util.List;11public class MethodSizeMockTransformerTest {12    public void testTransform() throws Exception {13        ClassPool pool = ClassPool.getDefault();14        CtClass cc = pool.get("org.powermock.core.transformers.javassist.MethodSizeMockTransformerTest$Test");15        MockTransformer transformer = new MethodSizeMockTransformer();16        transformer.transform(cc);17        CtMethod[] methods = cc.getDeclaredMethods();18        for (CtMethod method : methods) {19            System.out.println(method.getLongName());20        }21    }22    public static class Test {23        public void test1() {24            System.out.println("test1");25        }26        public void test2() {27            System.out.println("test2");28        }29        public void test3() {30            System.out.println("test3");31        }32        public void test4() {33            System.out.println("test4");34        }35        public void test5() {36            System.out.println("test5");37        }38        public void test6() {39            System.out.println("test6");40        }41        public void test7() {42            System.out.println("test7");43        }44        public void test8() {45            System.out.println("test8");46        }47        public void test9() {48            System.out.println("test9");49        }50        public void test10() {51            System.out.println("test10");52        }53        public void test11() {54            System.out.println("test11");55        }56        public void test12() {57            System.out.println("test12");58        }59        public void test13() {60            System.out.println("test13");61        }62        public void test14() {63            System.out.println("test14");64        }65        public void test15() {66            System.out.println("test15");67        }68        public void test16() {69            System.out.println("test16");70        }71        public void test17() {72            System.out.println("test17");73        }74        public void test18() {75            System.out.println("test18");76        }77        public void test19() {78            System.out.println("test19");79        }

transform

Using AI Code Generation

1package org.powermock.core.transformers.javassist;2import java.io.IOException;3import java.io.InputStream;4import java.net.URL;5import java.net.URLConnection;6import javassist.ClassPool;7import javassist.CtClass;8import javassist.NotFoundException;9import org.powermock.core.transformers.MockTransformer;10public class MethodSizeMockTransformer implements MockTransformer {11    public byte[] transform(ClassLoader loader, String className, byte[] classBytes) throws IOException {12        try {13            ClassPool classPool = new ClassPool();14            classPool.appendSystemPath();15            if (loader != null) {16                classPool.appendClassPath(new LoaderClassPath(loader));17            }18            CtClass clazz = classPool.makeClass(new ByteArrayInputStream(classBytes));19            if (clazz.isInterface() || clazz.isAnnotation()) {20                return classBytes;21            }22            clazz.defrost();23            for (CtMethod method : clazz.getDeclaredMethods()) {24                method.instrument(new ExprEditor() {25                    public void edit(MethodCall m) throws CannotCompileException {26                        if (m.getClassName().equals("java.lang.reflect.Method")27                                && m.getMethodName().equals("invoke")) {28                            m.replace("$_ = org.powermock.core.transformers.javassist.MethodSizeMockTransformer.invoke($$);");29                        }30                    }31                });32            }33            return clazz.toBytecode();34        } catch (Throwable t) {35            return classBytes;36        }37    }38    public static Object invoke(Object[] args) throws Throwable {39        try {40            Method method = (Method) args[1];41            Object target = args[0];42            Object[] arguments = (Object[]) args[2];43            return method.invoke(target, arguments);44        } catch (InvocationTargetException e) {45            throw e.getCause();46        }47    }48    public boolean canTransform(ClassLoader loader, String className) {49        return true;50    }51}52package org.powermock.core.transformers.javassist;53import java.io.File;54import java.io.FileOutputStream;55import java.io.IOException;56import java.io.InputStream;57import java.io.OutputStream;58import java.net.URL;59import java.net.URLConnection;60import java.util.ArrayList;61import java.util.List;62import javassist.ClassPool;63import javassist.CtClass;64import javassist.CtMethod;65import javassist.LoaderClassPath;66import javassist.NotFoundException;67import javassist.expr.ExprEditor;68import javassist.expr.MethodCall;69import org.powermock.core.transformers.MockTransformer;

transform

Using AI Code Generation

1package com.powermock;2import java.io.File;3import java.io.IOException;4import java.lang.instrument.IllegalClassFormatException;5import java.security.ProtectionDomain;6import javassist.ClassPool;7import javassist.CtClass;8import javassist.CtMethod;9import javassist.NotFoundException;10import javassist.expr.ExprEditor;11import javassist.expr.MethodCall;12import javassist.expr.NewExpr;13import org.powermock.core.transformers.javassist.MethodSizeMockTransformer;14public class JavaAgent {15	public static void premain(String agentArgs, java.lang.instrument.Instrumentation inst) {16		inst.addTransformer(new JavaAgent());17	}18	public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {19		try {20			return new MethodSizeMockTransformer().transform(loader, className, classBeingRedefined, protectionDomain, classfileBuffer);21		} catch (Throwable t) {22			t.printStackTrace();23			return classfileBuffer;24		}25	}26	public static void main(String[] args) throws NotFoundException, IOException {27		ClassPool cp = ClassPool.getDefault();28		CtClass cc = cp.get("com.powermock.Test");29		CtMethod[] methods = cc.getMethods();30		for (CtMethod ctMethod : methods) {31			System.out.println("Method Name: " + ctMethod.getName());32			ctMethod.instrument(new ExprEditor() {33				public void edit(MethodCall m) throws NotFoundException {34					System.out.println("Method Call: " + m.getClassName() + "." + m.getMethodName());35				}36				public void edit(NewExpr e) throws NotFoundException {37					System.out.println("New Expression: " + e.getClassName());38				}39			});40		}41		cc.writeFile("C:\\Users\\kumar\\Desktop\\");42	}43}44package com.powermock;45public class Test {46	public void test1() {47		System.out.println("Test 1");48	}49	public void test2() {50		System.out.println("Test 2");51	}52	public void test3() {53		System.out.println("Test 3");54	}55	public void test4() {56		System.out.println("Test 4");57	}58	public void test5() {59		System.out.println("Test 5");60	}

transform

Using AI Code Generation

1package com.example.demo;2import org.powermock.core.transformers.javassist.MethodSizeMockTransformer;3public class TestClass {4    public static void main(String[] args) {5        MethodSizeMockTransformer methodSizeMockTransformer = new MethodSizeMockTransformer();6    }7}8package com.example.demo;9import org.powermock.core.transformers.javassist.MethodSizeMockTransformer;10public class TestClass {11    public static void main(String[] args) {12        MethodSizeMockTransformer methodSizeMockTransformer = new MethodSizeMockTransformer();13        methodSizeMockTransformer.transform(null, null, null, null, null);14    }15}16package com.example.demo;17import org.powermock.core.transformers.javassist.MockTransformer;18public class TestClass {19    public static void main(String[] args) {20        MockTransformer mockTransformer = new MockTransformer();21    }22}23package com.example.demo;24import org.powermock.core.transformers.javassist.MockTransformer;25public class TestClass {26    public static void main(String[] args) {27        MockTransformer mockTransformer = new MockTransformer();28        mockTransformer.transform(null, null, null, null, null);29    }30}31package com.example.demo;32import org.powermock.core.transformers.javassist.PowerMockTransformer;33public class TestClass {34    public static void main(String[] args) {35        PowerMockTransformer powerMockTransformer = new PowerMockTransformer();36    }37}38package com.example.demo;39import org.powermock.core.transformers.javassist.PowerMockTransformer;40public class TestClass {41    public static void main(String[] args) {

transform

Using AI Code Generation

1public class Main {2    public static void main(String[] args) {3        MethodSizeMockTransformer transformer = new MethodSizeMockTransformer();4        ClassPool classPool = ClassPool.getDefault();5        CtClass ctClass = classPool.get("org.powermock.core.transformers.javassist.MethodSizeMockTransformer");6        transformer.transform(ctClass);7    }8}9public class Main {10    public static void main(String[] args) {11        MethodSizeMockTransformer transformer = new MethodSizeMockTransformer();12        ClassPool classPool = ClassPool.getDefault();13        CtClass ctClass = classPool.get("org.powermock.core.transformers.javassist.MethodSizeMockTransformer");14        transformer.transform(ctClass);15    }16}17public class Main {18    public static void main(String[] args) {19        MethodSizeMockTransformer transformer = new MethodSizeMockTransformer();20        ClassPool classPool = ClassPool.getDefault();21        CtClass ctClass = classPool.get("org.powermock.core.transformers.javassist.MethodSizeMockTransformer");22        transformer.transform(ctClass);23    }24}25public class Main {26    public static void main(String[] args) {27        MethodSizeMockTransformer transformer = new MethodSizeMockTransformer();28        ClassPool classPool = ClassPool.getDefault();29        CtClass ctClass = classPool.get("org.powermock.core.transformers.javassist.MethodSizeMockTransformer");30        transformer.transform(ctClass);31    }32}33public class Main {34    public static void main(String[] args) {35        MethodSizeMockTransformer transformer = new MethodSizeMockTransformer();36        ClassPool classPool = ClassPool.getDefault();37        CtClass ctClass = classPool.get("org.powermock.core.transformers.javassist.MethodSizeMockTransformer");38        transformer.transform(ctClass);39    }40}41public class Main {42    public static void main(String[] args)

transform

Using AI Code Generation

1import java.io.IOException;2import java.io.InputStream;3import java.net.URL;4import java.net.URLConnection;5import java.net.URLStreamHandler;6import java.util.HashMap;7import java.util.Map;8import java.util.concurrent.atomic.AtomicInteger;9import org.powermock.core.transformers.javassist.MethodSizeMockTransformer;10import javassist.ClassPool;11import javassist.CtClass;12import javassist.CtMethod;13import javassist.LoaderClassPath;14public class TestPowerMock {15    public static void main(String[] args) throws Throwable {16        final Map<String, byte[]> map = new HashMap<String, byte[]>();17        map.put("java.net.URL", new byte[10000]);18        map.put("java.net.URLConnection", new byte[10000]);19        map.put("java.net.URLStreamHandler", new byte[10000]);20        ClassPool cp = ClassPool.getDefault();21        cp.appendClassPath(new LoaderClassPath(TestPowerMock.class.getClassLoader()));22        MethodSizeMockTransformer transformer = new MethodSizeMockTransformer(cp, map);23        CtClass ctClass = cp.get("java.net.URL");24        CtMethod method = ctClass.getDeclaredMethod("openConnection");25        transformer.transform(method);26        System.out.println(method.getMethodInfo().getCodeAttribute().getLength());27        System.out.println(method.getMethodInfo().getCodeAttribute().getMaxStack());28        System.out.println(method.getMethodInfo().getCodeAttribute().getMaxLocals());29        final AtomicInteger counter = new AtomicInteger(0);30            public URLConnection openConnection() throws IOException {31                counter.incrementAndGet();32                return super.openConnection();33            }34        };35        url.openConnection();36        System.out.println(counter.get());37        url.openConnection();38        System.out.println(counter.get());39        url.openConnection();40        System.out.println(counter.get());41    }42}

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