93 lines
3.1 KiB
Java
93 lines
3.1 KiB
Java
/*
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* Copyright (C) 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Copied from com.google.gson.TypeUtils
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package com.google.gson.wsf;
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import java.lang.reflect.Array;
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import java.lang.reflect.GenericArrayType;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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/**
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* Utility class containing some methods for obtaining information on types.
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*
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* @author Inderjeet Singh
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* @author Joel Leitch
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*/
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final class TypeUtils {
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/**
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* Returns the actual type matching up with the first type variable.
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* So, for a {@code typeInfo} instance defined as:
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* <pre>
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* class Foo<A, B> {
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* }
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* Type fooType = new TypeToken<Foo<Integer, String>>() {}.getType();
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* </pre>
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* <code>TypeUtils.getActualTypeForFirstTypeVariable(fooType)</code> will return Integer.class.
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*/
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static Type getActualTypeForFirstTypeVariable(Type type) {
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if (type instanceof Class) {
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return Object.class;
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} else if (type instanceof ParameterizedType) {
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return ((ParameterizedType)type).getActualTypeArguments()[0];
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} else if (type instanceof GenericArrayType) {
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return getActualTypeForFirstTypeVariable(((GenericArrayType)type).getGenericComponentType());
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} else {
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throw new IllegalArgumentException("Type \'" + type + "\' is not a Class, "
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+ "ParameterizedType, or GenericArrayType. Can't extract class.");
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}
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}
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static boolean isArray(Type type) {
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if (type instanceof Class) {
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return ((Class<?>)type).isArray();
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} else if (type instanceof GenericArrayType) {
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return true;
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} else {
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return false;
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}
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}
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/**
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* This method returns the actual raw class associated with the specified type.
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*/
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static Class<?> toRawClass(Type type) {
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if (type instanceof Class) {
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return (Class<?>) type;
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} else if (type instanceof ParameterizedType) {
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ParameterizedType actualType = (ParameterizedType)type;
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return toRawClass(actualType.getRawType());
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} else if (type instanceof GenericArrayType) {
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GenericArrayType actualType = (GenericArrayType) type;
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Class<?> rawClass = toRawClass(actualType.getGenericComponentType());
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return wrapWithArray(rawClass);
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} else {
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throw new IllegalArgumentException("Type \'" + type + "\' is not a Class, "
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+ "ParameterizedType, or GenericArrayType. Can't extract class.");
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}
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}
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static Class<?> wrapWithArray(Class<?> rawClass) {
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return Array.newInstance(rawClass, 0).getClass();
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}
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private TypeUtils() {
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// Class with just some static utility methods, should not be instantiated
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}
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}
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