Apache CXF example source code file (WrapperHelperCompiler.java)
The Apache CXF WrapperHelperCompiler.java source code/**
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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
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*/
package org.apache.cxf.jaxb;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.List;
import javax.xml.bind.JAXBElement;
import org.apache.cxf.common.util.ASMHelper;
import org.apache.cxf.databinding.WrapperHelper;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
final class WrapperHelperCompiler extends ASMHelper {
final Class<?> wrapperType;
final Method setMethods[];
final Method getMethods[];
final Method jaxbMethods[];
final Field fields[];
final Object objectFactory;
final ClassWriter cw;
private WrapperHelperCompiler(Class<?> wrapperType,
Method setMethods[],
Method getMethods[],
Method jaxbMethods[],
Field fields[],
Object objectFactory) {
this.wrapperType = wrapperType;
this.setMethods = setMethods;
this.getMethods = getMethods;
this.jaxbMethods = jaxbMethods;
this.fields = fields;
this.objectFactory = objectFactory;
cw = createClassWriter();
}
static WrapperHelper compileWrapperHelper(Class<?> wrapperType,
Method setMethods[],
Method getMethods[],
Method jaxbMethods[],
Field fields[],
Object objectFactory) {
try {
return new WrapperHelperCompiler(wrapperType,
setMethods,
getMethods,
jaxbMethods,
fields,
objectFactory).compile();
} catch (Throwable t) {
// Some error - probably a bad version of ASM or similar
}
return null;
}
public WrapperHelper compile() {
if (cw == null) {
return null;
}
int count = 1;
String newClassName = wrapperType.getName() + "_WrapperTypeHelper" + count;
newClassName = newClassName.replaceAll("\\$", ".");
newClassName = periodToSlashes(newClassName);
Class<?> cls = super.findClass(newClassName.replace('/', '.'), wrapperType);
while (cls != null) {
try {
WrapperHelper helper = WrapperHelper.class.cast(cls.newInstance());
if (!helper.getSignature().equals(computeSignature())) {
count++;
newClassName = wrapperType.getName() + "_WrapperTypeHelper" + count;
newClassName = newClassName.replaceAll("\\$", ".");
newClassName = periodToSlashes(newClassName);
cls = super.findClass(newClassName.replace('/', '.'), wrapperType);
} else {
return helper;
}
} catch (Exception e) {
return null;
}
}
cw.visit(Opcodes.V1_5,
Opcodes.ACC_PUBLIC | Opcodes.ACC_SUPER,
newClassName,
null,
"java/lang/Object",
new String[] {periodToSlashes(WrapperHelper.class.getName())});
addConstructor(newClassName, cw, objectFactory == null ? null : objectFactory.getClass());
boolean b = addSignature();
if (b) {
b = addCreateWrapperObject(newClassName,
objectFactory == null ? null : objectFactory.getClass());
}
if (b) {
b = addGetWrapperParts(newClassName, wrapperType,
getMethods, fields, cw);
}
try {
if (b) {
cw.visitEnd();
byte bt[] = cw.toByteArray();
Class<?> cl = loadClass(newClassName.replace('/', '.'), wrapperType, bt);
Object o = cl.newInstance();
return WrapperHelper.class.cast(o);
}
} catch (Throwable e) {
// ignore, we'll just fall down to reflection based
}
return null;
}
private String computeSignature() {
StringBuilder b = new StringBuilder();
b.append(setMethods.length).append(':');
for (int x = 0; x < setMethods.length; x++) {
if (getMethods[x] == null) {
b.append("null,");
} else {
b.append(getMethods[x].getName()).append('/');
b.append(getMethods[x].getReturnType().getName()).append(',');
}
}
return b.toString();
}
private boolean addSignature() {
String sig = computeSignature();
if (sig == null) {
return false;
}
MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC,
"getSignature", "()Ljava/lang/String;", null, null);
mv.visitCode();
mv.visitLdcInsn(sig);
Label l0 = new Label();
mv.visitLabel(l0);
mv.visitLineNumber(100, l0);
mv.visitInsn(Opcodes.ARETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
return true;
}
private static void addConstructor(String newClassName, ClassWriter cw, Class<?> objectFactory) {
if (objectFactory != null) {
String ofName = "L" + periodToSlashes(objectFactory.getName()) + ";";
FieldVisitor fv = cw.visitField(0, "factory",
ofName,
null, null);
fv.visitEnd();
}
MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
Label l0 = new Label();
mv.visitLabel(l0);
mv.visitLineNumber(102, l0);
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitMethodInsn(Opcodes.INVOKESPECIAL,
"java/lang/Object",
"<init>",
"()V");
if (objectFactory != null) {
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitTypeInsn(Opcodes.NEW, periodToSlashes(objectFactory.getName()));
mv.visitInsn(Opcodes.DUP);
mv.visitMethodInsn(Opcodes.INVOKESPECIAL,
periodToSlashes(objectFactory.getName()),
"<init>", "()V");
mv.visitFieldInsn(Opcodes.PUTFIELD, periodToSlashes(newClassName),
"factory", "L" + periodToSlashes(objectFactory.getName()) + ";");
}
mv.visitInsn(Opcodes.RETURN);
Label l1 = new Label();
mv.visitLabel(l1);
mv.visitLineNumber(103, l0);
mv.visitLocalVariable("this", "L" + newClassName + ";", null, l0, l1, 0);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
private boolean addCreateWrapperObject(String newClassName,
Class<?> objectFactoryClass) {
MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC,
"createWrapperObject",
"(Ljava/util/List;)Ljava/lang/Object;",
"(Ljava/util/List<*>;)Ljava/lang/Object;",
new String[] {
"org/apache/cxf/interceptor/Fault"
});
mv.visitCode();
Label lBegin = new Label();
mv.visitLabel(lBegin);
mv.visitLineNumber(104, lBegin);
mv.visitTypeInsn(Opcodes.NEW, periodToSlashes(wrapperType.getName()));
mv.visitInsn(Opcodes.DUP);
mv.visitMethodInsn(Opcodes.INVOKESPECIAL, periodToSlashes(wrapperType.getName()),
"<init>", "()V");
mv.visitVarInsn(Opcodes.ASTORE, 2);
for (int x = 0; x < setMethods.length; x++) {
if (getMethods[x] == null) {
if (setMethods[x] == null
&& fields[x] == null) {
// null placeholder
continue;
} else {
return false;
}
}
Class<?> tp = getMethods[x].getReturnType();
mv.visitVarInsn(Opcodes.ALOAD, 2);
if (List.class.isAssignableFrom(tp)) {
doCollection(mv, x);
} else {
if (JAXBElement.class.isAssignableFrom(tp)) {
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitFieldInsn(Opcodes.GETFIELD, periodToSlashes(newClassName),
"factory",
"L" + periodToSlashes(objectFactoryClass.getName()) + ";");
}
mv.visitVarInsn(Opcodes.ALOAD, 1);
mv.visitIntInsn(Opcodes.SIPUSH, x);
mv.visitMethodInsn(Opcodes.INVOKEINTERFACE, "java/util/List", "get", "(I)Ljava/lang/Object;");
if (tp.isPrimitive()) {
mv.visitTypeInsn(Opcodes.CHECKCAST, NONPRIMITIVE_MAP.get(tp));
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, NONPRIMITIVE_MAP.get(tp),
tp.getName() + "Value", "()" + PRIMITIVE_MAP.get(tp));
} else if (JAXBElement.class.isAssignableFrom(tp)) {
mv.visitTypeInsn(Opcodes.CHECKCAST,
periodToSlashes(jaxbMethods[x].getParameterTypes()[0].getName()));
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, periodToSlashes(objectFactoryClass.getName()),
jaxbMethods[x].getName(),
getMethodSignature(jaxbMethods[x]));
} else if (tp.isArray()) {
mv.visitTypeInsn(Opcodes.CHECKCAST, getClassCode(tp));
} else {
mv.visitTypeInsn(Opcodes.CHECKCAST, periodToSlashes(tp.getName()));
}
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
periodToSlashes(wrapperType.getName()),
setMethods[x].getName(), "(" + getClassCode(tp) + ")V");
}
}
mv.visitVarInsn(Opcodes.ALOAD, 2);
mv.visitInsn(Opcodes.ARETURN);
Label lEnd = new Label();
mv.visitLabel(lEnd);
mv.visitLocalVariable("this", "L" + newClassName + ";", null, lBegin, lEnd, 0);
mv.visitLocalVariable("lst", "Ljava/util/List;", "Ljava/util/List<*>;", lBegin, lEnd, 1);
mv.visitLocalVariable("ok", "L" + periodToSlashes(wrapperType.getName()) + ";",
null, lBegin, lEnd, 2);
mv.visitMaxs(0, 0);
mv.visitEnd();
return true;
}
private void doCollection(MethodVisitor mv, int x) {
// List aVal = obj.getA();
// List newA = (List)lst.get(99);
// if (aVal == null) {
// obj.setA(newA);
// } else if (newA != null) {
// aVal.addAll(newA);
// }
Label l3 = new Label();
mv.visitLabel(l3);
mv.visitLineNumber(114, l3);
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
periodToSlashes(wrapperType.getName()),
getMethods[x].getName(),
getMethodSignature(getMethods[x]));
mv.visitVarInsn(Opcodes.ASTORE, 3);
mv.visitVarInsn(Opcodes.ALOAD, 1);
mv.visitIntInsn(Opcodes.SIPUSH, x);
mv.visitMethodInsn(Opcodes.INVOKEINTERFACE, "java/util/List",
"get", "(I)Ljava/lang/Object;");
mv.visitTypeInsn(Opcodes.CHECKCAST, "java/util/List");
mv.visitVarInsn(Opcodes.ASTORE, 4);
mv.visitVarInsn(Opcodes.ALOAD, 3);
Label nonNullLabel = new Label();
mv.visitJumpInsn(Opcodes.IFNONNULL, nonNullLabel);
if (setMethods[x] == null) {
mv.visitTypeInsn(Opcodes.NEW, "java/lang/RuntimeException");
mv.visitInsn(Opcodes.DUP);
mv.visitLdcInsn(getMethods[x].getName() + " returned null and there isn't a set method.");
mv.visitMethodInsn(Opcodes.INVOKESPECIAL,
"java/lang/RuntimeException",
"<init>", "(Ljava/lang/String;)V");
mv.visitInsn(Opcodes.ATHROW);
} else {
mv.visitVarInsn(Opcodes.ALOAD, 2);
mv.visitVarInsn(Opcodes.ALOAD, 4);
mv.visitTypeInsn(Opcodes.CHECKCAST,
getMethods[x].getReturnType().getName().replace('.', '/'));
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
periodToSlashes(wrapperType.getName()),
setMethods[x].getName(),
getMethodSignature(setMethods[x]));
}
Label jumpOverLabel = new Label();
mv.visitJumpInsn(Opcodes.GOTO, jumpOverLabel);
mv.visitLabel(nonNullLabel);
mv.visitLineNumber(106, nonNullLabel);
mv.visitVarInsn(Opcodes.ALOAD, 4);
mv.visitJumpInsn(Opcodes.IFNULL, jumpOverLabel);
mv.visitVarInsn(Opcodes.ALOAD, 3);
mv.visitVarInsn(Opcodes.ALOAD, 4);
mv.visitMethodInsn(Opcodes.INVOKEINTERFACE,
"java/util/List", "addAll", "(Ljava/util/Collection;)Z");
mv.visitInsn(Opcodes.POP);
mv.visitLabel(jumpOverLabel);
mv.visitLineNumber(107, jumpOverLabel);
}
private static boolean addGetWrapperParts(String newClassName,
Class<?> wrapperClass,
Method getMethods[],
Field fields[],
ClassWriter cw) {
MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC,
"getWrapperParts",
"(Ljava/lang/Object;)Ljava/util/List;",
"(Ljava/lang/Object;)Ljava/util/List<Ljava/lang/Object;>;",
new String[] {
"org/apache/cxf/interceptor/Fault"
});
mv.visitCode();
Label lBegin = new Label();
mv.visitLabel(lBegin);
mv.visitLineNumber(108, lBegin);
// the ret List
mv.visitTypeInsn(Opcodes.NEW, "java/util/ArrayList");
mv.visitInsn(Opcodes.DUP);
mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/util/ArrayList", "<init>", "()V");
mv.visitVarInsn(Opcodes.ASTORE, 2);
// cast the Object to the wrapperType type
mv.visitVarInsn(Opcodes.ALOAD, 1);
mv.visitTypeInsn(Opcodes.CHECKCAST, periodToSlashes(wrapperClass.getName()));
mv.visitVarInsn(Opcodes.ASTORE, 3);
for (int x = 0; x < getMethods.length; x++) {
Method method = getMethods[x];
if (method == null && fields[x] != null) {
// fallback to reflection mode
return false;
}
if (method == null) {
Label l3 = new Label();
mv.visitLabel(l3);
mv.visitLineNumber(200 + x, l3);
mv.visitVarInsn(Opcodes.ALOAD, 2);
mv.visitInsn(Opcodes.ACONST_NULL);
mv.visitMethodInsn(Opcodes.INVOKEINTERFACE, "java/util/List",
"add", "(Ljava/lang/Object;)Z");
mv.visitInsn(Opcodes.POP);
} else {
Label l3 = new Label();
mv.visitLabel(l3);
mv.visitLineNumber(250 + x, l3);
mv.visitVarInsn(Opcodes.ALOAD, 2);
mv.visitVarInsn(Opcodes.ALOAD, 3);
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
periodToSlashes(wrapperClass.getName()),
method.getName(),
getMethodSignature(method));
if (method.getReturnType().isPrimitive()) {
// wrap into Object type
createObjectWrapper(mv, method.getReturnType());
}
if (JAXBElement.class.isAssignableFrom(method.getReturnType())) {
Label jumpOverLabel = new Label();
mv.visitInsn(Opcodes.DUP);
mv.visitJumpInsn(Opcodes.IFNULL, jumpOverLabel);
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
"javax/xml/bind/JAXBElement",
"getValue", "()Ljava/lang/Object;");
mv.visitLabel(jumpOverLabel);
}
mv.visitMethodInsn(Opcodes.INVOKEINTERFACE, "java/util/List", "add", "(Ljava/lang/Object;)Z");
mv.visitInsn(Opcodes.POP);
}
}
// return the list
Label l2 = new Label();
mv.visitLabel(l2);
mv.visitLineNumber(108, l2);
mv.visitVarInsn(Opcodes.ALOAD, 2);
mv.visitInsn(Opcodes.ARETURN);
Label lEnd = new Label();
mv.visitLabel(lEnd);
mv.visitLocalVariable("this", "L" + newClassName + ";", null, lBegin, lEnd, 0);
mv.visitLocalVariable("o", "Ljava/lang/Object;", null, lBegin, lEnd, 1);
mv.visitLocalVariable("ret", "Ljava/util/List;", "Ljava/util/List<Ljava/lang/Object;>;",
lBegin, lEnd, 2);
mv.visitLocalVariable("ok", "L" + periodToSlashes(wrapperClass.getName()) + ";",
null, lBegin, lEnd, 3);
mv.visitMaxs(0, 0);
mv.visitEnd();
return true;
}
private static void createObjectWrapper(MethodVisitor mv, Class<?> cl) {
mv.visitMethodInsn(Opcodes.INVOKESTATIC, NONPRIMITIVE_MAP.get(cl),
"valueOf", "(" + PRIMITIVE_MAP.get(cl) + ")L"
+ NONPRIMITIVE_MAP.get(cl) + ";");
}
}
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