/* * Copyright (C) 2008 Google Inc. * * Licensed 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 com.google.gson; import java.lang.reflect.Type; /** * Decorators a {@code JsonSerializer} instance with exception handling. This wrapper class * ensures that a {@code JsonSerializer} will not propagate any exception other than a * {@link JsonParseException}. * * @param type of the serializer being wrapped. * * @author Inderjeet Singh * @author Joel Leitch */ class JsonSerializerExceptionWrapper implements JsonSerializer { private final JsonSerializer delegate; /** * Returns a wrapped {@link JsonSerializer} object that has been decorated with * {@link JsonParseException} handling. * * @param delegate the {@code JsonSerializer} instance to be wrapped * @throws IllegalArgumentException if {@code delegate} is {@code null}. */ JsonSerializerExceptionWrapper(JsonSerializer delegate) { Preconditions.checkNotNull(delegate); this.delegate = delegate; } public JsonElement serialize(T src, Type typeOfSrc, JsonSerializationContext context) { try { return delegate.serialize(src, typeOfSrc, context); } catch (JsonParseException e) { // just rethrow the exception throw e; } catch (Exception e) { // throw as a JsonParseException StringBuilder errorMsg = new StringBuilder() .append("The JsonSerializer ") .append(delegate) .append(" failed to serialized object ") .append(src) .append(" given the type ") .append(typeOfSrc); throw new JsonParseException(errorMsg.toString(), e); } } @Override public String toString() { return delegate.toString(); } }