135 lines
4.8 KiB
Java
135 lines
4.8 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 java.lang.reflect.Array;
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import java.lang.reflect.Field;
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import java.lang.reflect.Type;
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import java.util.Collection;
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/**
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* A visitor that populates fields of an object with data from its equivalent
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* JSON representation
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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 JsonArrayDeserializationVisitor<T> extends JsonDeserializationVisitor<T> {
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private final Class<?> componentType;
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JsonArrayDeserializationVisitor(JsonArray jsonArray, Type arrayType,
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ObjectNavigatorFactory factory, ObjectConstructor objectConstructor,
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TypeAdapter typeAdapter, ParameterizedTypeHandlerMap<JsonDeserializer<?>> deserializers,
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JsonDeserializationContext context) {
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super(jsonArray, arrayType, factory, objectConstructor, typeAdapter, deserializers, context);
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this.componentType = TypeUtils.toRawClass(arrayType);
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}
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@Override
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@SuppressWarnings("unchecked")
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protected T constructTarget() {
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TypeInfo typeInfo = new TypeInfo(targetType);
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JsonArray jsonArray = json.getAsJsonArray();
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if (typeInfo.isPrimitiveOrStringAndNotAnArray()) {
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if (jsonArray.size() != 1) {
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throw new IllegalArgumentException(
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"Primitives should be an array of length 1, but was: " + jsonArray);
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}
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return (T) objectConstructor.construct(typeInfo.getWrappedClass());
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} else if (typeInfo.isArray()) {
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TypeInfoArray arrayTypeInfo = TypeInfoFactory.getTypeInfoForArray(targetType);
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// We know that we are getting back an array of the required type, so
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// this typecasting is safe.
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return (T) objectConstructor.constructArray(arrayTypeInfo.getSecondLevelType(),
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jsonArray.size());
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} else { // is a collection
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return (T) objectConstructor.construct(typeInfo.getRawClass());
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}
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}
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public void visitArray(Object array, Type arrayType) {
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JsonArray jsonArray = json.getAsJsonArray();
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TypeInfoArray arrayTypeInfo = TypeInfoFactory.getTypeInfoForArray(arrayType);
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for (int i = 0; i < jsonArray.size(); i++) {
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JsonElement jsonChild = jsonArray.get(i);
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Object child;
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if (jsonChild == null) {
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child = null;
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} else if (jsonChild instanceof JsonObject) {
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child = visitChildAsObject(arrayTypeInfo.getComponentRawType(), jsonChild);
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} else if (jsonChild instanceof JsonArray) {
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child = visitChildAsArray(arrayTypeInfo.getSecondLevelType(), jsonChild.getAsJsonArray());
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} else if (jsonChild instanceof JsonPrimitive) {
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child = visitChildAsPrimitive(arrayTypeInfo.getComponentRawType(),
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jsonChild.getAsJsonPrimitive());
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} else {
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throw new IllegalStateException();
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}
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Array.set(array, i, child);
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}
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}
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@SuppressWarnings("unchecked")
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public void visitCollection(Collection collection, Type collectionType) {
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Type childType = TypeUtils.getActualTypeForFirstTypeVariable(collectionType);
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for (JsonElement jsonChild : json.getAsJsonArray()) {
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if (childType == Object.class) {
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throw new JsonParseException(collection +
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" must not be a raw collection. Try making it genericized instead.");
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}
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Object child = visitChild(childType, jsonChild);
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collection.add(child);
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}
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}
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@SuppressWarnings("unchecked")
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public void visitPrimitiveValue(Object obj) {
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target = (T) typeAdapter.adaptType(json.getAsJsonArray().get(0).getAsObject(), componentType);
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}
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// We should not implement any other method from Visitor interface since
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// all other methods should be invoked on JsonObjectDeserializationVisitor
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// instead.
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public void endVisitingObject(Object node) {
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throw new UnsupportedOperationException();
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}
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public void startVisitingObject(Object node) {
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throw new UnsupportedOperationException();
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}
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public void visitArrayField(Field f, Type typeOfF, Object obj) {
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throw new UnsupportedOperationException();
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}
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public void visitCollectionField(Field f, Type typeOfF, Object obj) {
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throw new UnsupportedOperationException();
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}
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public void visitObjectField(Field f, Type typeOfF, Object obj) {
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throw new UnsupportedOperationException();
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}
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public void visitPrimitiveField(Field f, Type typeOfF, Object obj) {
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throw new UnsupportedOperationException();
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}
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}
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