diff options
Diffstat (limited to 'sca-java-2.x/tags/2.0.1-RC1/modules/interface-java-jaxrs/src/main/java/org/apache/tuscany/sca/interfacedef/java/jaxrs/CodeGenerationHelper.java')
| -rw-r--r-- | sca-java-2.x/tags/2.0.1-RC1/modules/interface-java-jaxrs/src/main/java/org/apache/tuscany/sca/interfacedef/java/jaxrs/CodeGenerationHelper.java | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/interface-java-jaxrs/src/main/java/org/apache/tuscany/sca/interfacedef/java/jaxrs/CodeGenerationHelper.java b/sca-java-2.x/tags/2.0.1-RC1/modules/interface-java-jaxrs/src/main/java/org/apache/tuscany/sca/interfacedef/java/jaxrs/CodeGenerationHelper.java new file mode 100644 index 0000000000..e1891e6c0b --- /dev/null +++ b/sca-java-2.x/tags/2.0.1-RC1/modules/interface-java-jaxrs/src/main/java/org/apache/tuscany/sca/interfacedef/java/jaxrs/CodeGenerationHelper.java @@ -0,0 +1,280 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * 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 + * specific language governing permissions and limitations + * under the License. + */ + +package org.apache.tuscany.sca.interfacedef.java.jaxrs; + +import java.lang.reflect.Array; +import java.lang.reflect.GenericArrayType; +import java.lang.reflect.ParameterizedType; +import java.lang.reflect.Type; +import java.lang.reflect.TypeVariable; +import java.lang.reflect.WildcardType; +import java.util.ArrayList; +import java.util.Collection; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +import org.objectweb.asm.Opcodes; + +/** + * @version $Rev$ $Date$ + */ +public class CodeGenerationHelper { + /** + * @param type + * @return + */ + public static Class<?> getErasure(Type type) { + if (type instanceof Class) { + return (Class<?>)type; + } else if (type instanceof GenericArrayType) { + GenericArrayType arrayType = (GenericArrayType)type; + Class<?> componentType = getErasure(arrayType.getGenericComponentType()); + return Array.newInstance(componentType, 0).getClass(); + } else if (type instanceof ParameterizedType) { + ParameterizedType pType = (ParameterizedType)type; + return getErasure(pType.getRawType()); + } else if (type instanceof WildcardType) { + WildcardType wType = (WildcardType)type; + Type[] types = wType.getUpperBounds(); + if (types.length == 0) { + return Object.class; + } + return getErasure(types[0]); + } else if (type instanceof TypeVariable) { + TypeVariable<?> var = (TypeVariable<?>)type; + Type[] types = var.getBounds(); + if (types.length == 0) { + return Object.class; + } + return getErasure(types[0]); + } + return null; + } + + /** + * @param type + * @return + */ + public static String getJAXWSSignature(Type type) { + Class<?> cls = getErasure(type); + if (Collection.class.isAssignableFrom(cls) && (type instanceof ParameterizedType)) { + ParameterizedType pType = (ParameterizedType)type; + Type p = pType.getActualTypeArguments()[0]; + StringBuffer sb = new StringBuffer(); + sb.append(getSignature(cls)); + sb.deleteCharAt(sb.length() - 1); // Remove ; + sb.append('<').append(getSignature(getErasure(p))).append(">;"); + return sb.toString(); + } else if (Map.class.isAssignableFrom(cls) && (type instanceof ParameterizedType)) { + ParameterizedType pType = (ParameterizedType)type; + Type key = pType.getActualTypeArguments()[0]; + Type value = pType.getActualTypeArguments()[1]; + StringBuffer sb = new StringBuffer(); + sb.append(getSignature(cls)); + sb.deleteCharAt(sb.length() - 1); // Remove ; + sb.append('<').append(getSignature(getErasure(key))).append(getSignature(getErasure(value))).append(">;"); + return sb.toString(); + } else { + return getSignature(cls); + } + } + + /** + * @param type + * @return + */ + public static String getSignature(Type type) { + if (!(type instanceof Class)) { + if (type instanceof ParameterizedType) { + ParameterizedType pType = (ParameterizedType)type; + StringBuffer sb = new StringBuffer(); + String rawType = getSignature(pType.getRawType()); + sb.append(rawType.substring(0, rawType.length() - 1)); + sb.append('<'); + for (Type t : pType.getActualTypeArguments()) { + String argType = getSignature(t); + sb.append(argType); + } + sb.append('>'); + sb.append(rawType.substring(rawType.length() - 1)); + return sb.toString(); + } + if (type instanceof TypeVariable) { + return "T" + ((TypeVariable<?>)type).getName() + ";"; + } + if (type instanceof GenericArrayType) { + GenericArrayType arrayType = (GenericArrayType)type; + return "[" + getSignature(arrayType.getGenericComponentType()); + } + if (type instanceof WildcardType) { + WildcardType wType = (WildcardType)type; + Type[] types = wType.getUpperBounds(); + StringBuffer sb = new StringBuffer(); + if (types.length == 0 || !(types.length == 1 && types[0] == Object.class)) { + sb.append('+'); + for (Type t : types) { + sb.append(getSignature(t)); + } + } + types = wType.getLowerBounds(); + if (types.length != 0) { + sb.append('-'); + for (Type t : wType.getLowerBounds()) { + sb.append(getSignature(t)); + } + } + if (sb.length() == 0) { + return "*"; + } + return sb.toString(); + } + } + Class<?> cls = (Class<?>)type; + return org.objectweb.asm.Type.getDescriptor(cls); + } + + /** + * Get the actual type arguments a child class has used to extend a generic base class. + * + * @param baseClass the base class + * @param childClass the child class + * @return a list of the raw classes for the actual type arguments. + */ + public static <T> List<Class<?>> resovleTypeArguments(Class<T> baseClass, Class<? extends T> childClass) { + Map<Type, Type> resolvedTypes = new HashMap<Type, Type>(); + Type type = childClass; + // start walking up the inheritance hierarchy until we hit baseClass + while (!getErasure(type).equals(baseClass)) { + if (type instanceof Class) { + // there is no useful information for us in raw types, so just keep going. + type = ((Class<?>)type).getGenericSuperclass(); + } else { + ParameterizedType parameterizedType = (ParameterizedType)type; + Class<?> rawType = getErasure(parameterizedType.getRawType()); + + Type[] actualTypeArguments = parameterizedType.getActualTypeArguments(); + TypeVariable<?>[] typeParameters = rawType.getTypeParameters(); + for (int i = 0; i < actualTypeArguments.length; i++) { + resolvedTypes.put(typeParameters[i], actualTypeArguments[i]); + } + + if (!rawType.equals(baseClass)) { + type = rawType.getGenericSuperclass(); + } + } + } + + // finally, for each actual type argument provided to baseClass, determine (if possible) + // the raw class for that type argument. + Type[] actualTypeArguments; + if (type instanceof Class) { + actualTypeArguments = ((Class<?>)type).getTypeParameters(); + } else { + actualTypeArguments = ((ParameterizedType)type).getActualTypeArguments(); + } + List<Class<?>> typeArgumentsAsClasses = new ArrayList<Class<?>>(); + // resolve types by chasing down type variables. + for (Type baseType : actualTypeArguments) { + while (resolvedTypes.containsKey(baseType)) { + baseType = resolvedTypes.get(baseType); + } + typeArgumentsAsClasses.add(getErasure(baseType)); + } + return typeArgumentsAsClasses; + } + + /* + signatures.put(boolean.class, "Z"); + signatures.put(byte.class, "B"); + signatures.put(char.class, "C"); + signatures.put(short.class, "S"); + signatures.put(int.class, "I"); + signatures.put(long.class, "J"); + signatures.put(float.class, "F"); + signatures.put(double.class, "D"); + */ + public static int getLoadOPCode(String signature) { + if ("Z".equals(signature) || "B".equals(signature) + || "C".equals(signature) + || "S".equals(signature) + || "I".equals(signature)) { + return Opcodes.ILOAD; + } + + if ("J".equals(signature)) { + return Opcodes.LLOAD; + } + + if ("F".equals(signature)) { + return Opcodes.FLOAD; + } + + if ("D".equals(signature)) { + return Opcodes.DLOAD; + } + + return Opcodes.ALOAD; + + } + + public static int getReturnOPCode(String signature) { + if ("Z".equals(signature) || "B".equals(signature) + || "C".equals(signature) + || "S".equals(signature) + || "I".equals(signature)) { + return Opcodes.IRETURN; + } + + if ("J".equals(signature)) { + return Opcodes.LRETURN; + } + + if ("F".equals(signature)) { + return Opcodes.FRETURN; + } + + if ("D".equals(signature)) { + return Opcodes.DRETURN; + } + if ("V".equals(signature)) { + return Opcodes.RETURN; + } + + return Opcodes.ARETURN; + + } + + /** + * Get the package prefix for generated JAXWS artifacts + * @param cls + * @return + */ + public static String getPackagePrefix(Class<?> cls) { + String name = cls.getName(); + int index = name.lastIndexOf('.'); + if (index == -1) { + return "jaxws."; + } else { + return name.substring(0, index) + ".jaxws."; + } + } + +} |