116 lines
4.1 KiB
Java
116 lines
4.1 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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package org.mcteam.factions.gson;
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import org.mcteam.factions.gson.internal.$Gson$Preconditions;
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import java.lang.reflect.Type;
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/**
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* Abstract data value container for the {@link ObjectNavigator.Visitor}
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* implementations. This class exposes the {@link #getTarget()} method
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* which returns the class that was visited by this object.
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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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abstract class JsonDeserializationVisitor<T> implements ObjectNavigator.Visitor {
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protected final ObjectNavigator objectNavigator;
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protected final FieldNamingStrategy2 fieldNamingPolicy;
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protected final ObjectConstructor objectConstructor;
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protected final ParameterizedTypeHandlerMap<JsonDeserializer<?>> deserializers;
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protected T target;
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protected final JsonElement json;
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protected final Type targetType;
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protected final JsonDeserializationContext context;
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protected boolean constructed;
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JsonDeserializationVisitor(JsonElement json, Type targetType,
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ObjectNavigator objectNavigator, FieldNamingStrategy2 fieldNamingPolicy,
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ObjectConstructor objectConstructor,
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ParameterizedTypeHandlerMap<JsonDeserializer<?>> deserializers,
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JsonDeserializationContext context) {
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this.targetType = targetType;
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this.objectNavigator = objectNavigator;
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this.fieldNamingPolicy = fieldNamingPolicy;
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this.objectConstructor = objectConstructor;
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this.deserializers = deserializers;
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this.json = $Gson$Preconditions.checkNotNull(json);
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this.context = context;
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this.constructed = false;
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}
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public T getTarget() {
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if (!constructed) {
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target = constructTarget();
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constructed = true;
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}
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return target;
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}
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protected abstract T constructTarget();
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public void start(ObjectTypePair node) {
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}
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public void end(ObjectTypePair node) {
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}
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@SuppressWarnings("unchecked")
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public final boolean visitUsingCustomHandler(ObjectTypePair objTypePair) {
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Pair<JsonDeserializer<?>, ObjectTypePair> pair = objTypePair.getMatchingHandler(deserializers);
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if (pair == null) {
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return false;
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}
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Object value = invokeCustomDeserializer(json, pair);
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target = (T) value;
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constructed = true;
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return true;
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}
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protected Object invokeCustomDeserializer(JsonElement element,
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Pair<JsonDeserializer<?>, ObjectTypePair> pair) {
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if (element == null || element.isJsonNull()) {
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return null;
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}
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Type objType = pair.second.type;
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return (pair.first).deserialize(element, objType, context);
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}
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final Object visitChildAsObject(Type childType, JsonElement jsonChild) {
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JsonDeserializationVisitor<?> childVisitor =
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new JsonObjectDeserializationVisitor<Object>(jsonChild, childType,
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objectNavigator, fieldNamingPolicy, objectConstructor, deserializers, context);
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return visitChild(childType, childVisitor);
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}
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final Object visitChildAsArray(Type childType, JsonArray jsonChild) {
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JsonDeserializationVisitor<?> childVisitor =
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new JsonArrayDeserializationVisitor<Object>(jsonChild.getAsJsonArray(), childType,
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objectNavigator, fieldNamingPolicy, objectConstructor, deserializers, context);
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return visitChild(childType, childVisitor);
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}
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private Object visitChild(Type type, JsonDeserializationVisitor<?> childVisitor) {
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objectNavigator.accept(new ObjectTypePair(null, type, false), childVisitor);
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// the underlying object may have changed during the construction phase
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// This happens primarily because of custom deserializers
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return childVisitor.getTarget();
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}
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}
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