75 lines
2.6 KiB
Java
75 lines
2.6 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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package com.google.gson;
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import com.google.gson.internal.Primitives;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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/**
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* Handles type conversion from some object to some primitive (or primitive wrapper instance).
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*
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* <p>Used by {@link ParameterizedTypeFixtures.MyParameterizedTypeAdapter}.
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*
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* @author Joel Leitch
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*/
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final class PrimitiveTypeAdapter {
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@SuppressWarnings("unchecked")
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public <T> T adaptType(Object from, Class<T> to) {
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Class<?> aClass = Primitives.wrap(to);
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if (Primitives.isWrapperType(aClass)) {
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if (aClass == Character.class) {
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String value = from.toString();
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if (value.length() == 1) {
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return (T) (Character) from.toString().charAt(0);
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}
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throw new JsonParseException("The value: " + value + " contains more than a character.");
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}
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try {
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Constructor<?> constructor = aClass.getConstructor(String.class);
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return (T) constructor.newInstance(from.toString());
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} catch (NoSuchMethodException e) {
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throw new JsonParseException(e);
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} catch (IllegalAccessException e) {
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throw new JsonParseException(e);
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} catch (InvocationTargetException e) {
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throw new JsonParseException(e);
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} catch (InstantiationException e) {
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throw new JsonParseException(e);
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}
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} else if (Enum.class.isAssignableFrom(to)) {
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// Case where the type being adapted to is an Enum
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// We will try to convert from.toString() to the enum
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try {
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Method valuesMethod = to.getMethod("valueOf", String.class);
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return (T) valuesMethod.invoke(null, from.toString());
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} catch (NoSuchMethodException e) {
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throw new RuntimeException(e);
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} catch (IllegalAccessException e) {
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throw new RuntimeException(e);
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} catch (InvocationTargetException e) {
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throw new RuntimeException(e);
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}
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} else {
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throw new JsonParseException("Can not adapt type " + from.getClass() + " to " + to);
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}
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}
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}
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