| /* |
| * 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.felix.gogo.commands.converter; |
| |
| 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.HashMap; |
| import java.util.Map; |
| |
| import org.osgi.framework.Bundle; |
| import org.apache.felix.gogo.commands.converter.ReifiedType; |
| |
| public class GenericType extends ReifiedType { |
| |
| private static final GenericType[] EMPTY = new GenericType[0]; |
| |
| private static final Map<String, Class> primitiveClasses = new HashMap<String, Class>(); |
| |
| static { |
| primitiveClasses.put("int", int.class); |
| primitiveClasses.put("short", short.class); |
| primitiveClasses.put("long", long.class); |
| primitiveClasses.put("byte", byte.class); |
| primitiveClasses.put("char", char.class); |
| primitiveClasses.put("float", float.class); |
| primitiveClasses.put("double", double.class); |
| primitiveClasses.put("boolean", boolean.class); |
| } |
| |
| private GenericType[] parameters; |
| |
| public GenericType(Type type) { |
| this(getConcreteClass(type), parametersOf(type)); |
| } |
| |
| public GenericType(Class clazz, GenericType... parameters) { |
| super(clazz); |
| this.parameters = parameters; |
| } |
| |
| public static GenericType parse(String type, Object loader) throws ClassNotFoundException, IllegalArgumentException { |
| type = type.trim(); |
| // Check if this is an array |
| if (type.endsWith("[]")) { |
| GenericType t = parse(type.substring(0, type.length() - 2), loader); |
| return new GenericType(Array.newInstance(t.getRawClass(), 0).getClass(), t); |
| } |
| // Check if this is a generic |
| int genericIndex = type.indexOf('<'); |
| if (genericIndex > 0) { |
| if (!type.endsWith(">")) { |
| throw new IllegalArgumentException("Can not load type: " + type); |
| } |
| GenericType base = parse(type.substring(0, genericIndex), loader); |
| String[] params = type.substring(genericIndex + 1, type.length() - 1).split(","); |
| GenericType[] types = new GenericType[params.length]; |
| for (int i = 0; i < params.length; i++) { |
| types[i] = parse(params[i], loader); |
| } |
| return new GenericType(base.getRawClass(), types); |
| } |
| // Primitive |
| if (primitiveClasses.containsKey(type)) { |
| return new GenericType(primitiveClasses.get(type)); |
| } |
| // Class |
| if (loader instanceof ClassLoader) { |
| return new GenericType(((ClassLoader) loader).loadClass(type)); |
| } else if (loader instanceof Bundle) { |
| return new GenericType(((Bundle) loader).loadClass(type)); |
| } else { |
| throw new IllegalArgumentException("Unsupported loader: " + loader); |
| } |
| } |
| |
| @Override |
| public ReifiedType getActualTypeArgument(int i) { |
| if (parameters.length == 0) { |
| return super.getActualTypeArgument(i); |
| } |
| return parameters[i]; |
| } |
| |
| @Override |
| public int size() { |
| return parameters.length; |
| } |
| |
| @Override |
| public String toString() { |
| Class cl = getRawClass(); |
| if (cl.isArray()) { |
| if (parameters.length > 0) { |
| return parameters[0].toString() + "[]"; |
| } else { |
| return cl.getComponentType().getName() + "[]"; |
| } |
| } |
| if (parameters.length > 0) { |
| StringBuilder sb = new StringBuilder(); |
| sb.append(cl.getName()); |
| sb.append("<"); |
| for (int i = 0; i < parameters.length; i++) { |
| if (i > 0) { |
| sb.append(","); |
| } |
| sb.append(parameters[i].toString()); |
| } |
| sb.append(">"); |
| return sb.toString(); |
| } |
| return cl.getName(); |
| } |
| |
| static GenericType[] parametersOf(Type type ) { |
| if ( type instanceof Class ) { |
| Class clazz = (Class) type; |
| if (clazz.isArray()) { |
| GenericType t = new GenericType(clazz.getComponentType()); |
| if (t.size() > 0) { |
| return new GenericType[] { t }; |
| } else { |
| return EMPTY; |
| } |
| } else { |
| return EMPTY; |
| } |
| } |
| if ( type instanceof ParameterizedType ) { |
| ParameterizedType pt = (ParameterizedType) type; |
| Type [] parameters = pt.getActualTypeArguments(); |
| GenericType[] gts = new GenericType[parameters.length]; |
| for ( int i =0; i<gts.length; i++) { |
| gts[i] = new GenericType(parameters[i]); |
| } |
| return gts; |
| } |
| if ( type instanceof GenericArrayType ) { |
| return new GenericType[] { new GenericType(((GenericArrayType) type).getGenericComponentType()) }; |
| } |
| throw new IllegalStateException(); |
| } |
| |
| static Class<?> getConcreteClass(Type type) { |
| Type ntype = collapse(type); |
| if ( ntype instanceof Class ) |
| return (Class<?>) ntype; |
| |
| if ( ntype instanceof ParameterizedType ) |
| return getConcreteClass(collapse(((ParameterizedType)ntype).getRawType())); |
| |
| throw new RuntimeException("Unknown type " + type ); |
| } |
| |
| static Type collapse(Type target) { |
| if (target instanceof Class || target instanceof ParameterizedType ) { |
| return target; |
| } else if (target instanceof TypeVariable) { |
| return collapse(((TypeVariable<?>) target).getBounds()[0]); |
| } else if (target instanceof GenericArrayType) { |
| Type t = collapse(((GenericArrayType) target) |
| .getGenericComponentType()); |
| while ( t instanceof ParameterizedType ) |
| t = collapse(((ParameterizedType)t).getRawType()); |
| return Array.newInstance((Class<?>)t, 0).getClass(); |
| } else if (target instanceof WildcardType) { |
| WildcardType wct = (WildcardType) target; |
| if (wct.getLowerBounds().length == 0) |
| return collapse(wct.getUpperBounds()[0]); |
| else |
| return collapse(wct.getLowerBounds()[0]); |
| } |
| throw new RuntimeException("Huh? " + target); |
| } |
| |
| } |