| package org.apache.tika.metadata.serialization; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| |
| |
| import java.io.Reader; |
| import java.io.Writer; |
| |
| import com.google.gson.Gson; |
| import com.google.gson.JsonIOException; |
| import org.apache.tika.exception.TikaException; |
| import org.apache.tika.metadata.Metadata; |
| |
| public class JsonMetadata extends JsonMetadataBase{ |
| private static Gson GSON; |
| |
| static { |
| GSON = defaultInit(); |
| } |
| /** |
| * Serializes a Metadata object to Json. This does not flush or close the writer. |
| * |
| * @param metadata metadata to write |
| * @param writer writer |
| * @throws TikaException if there is an IOException during writing |
| */ |
| public static void toJson(Metadata metadata, Writer writer) throws TikaException { |
| try { |
| GSON.toJson(metadata, writer); |
| } catch (JsonIOException e) { |
| throw new TikaException(e.getMessage()); |
| } |
| } |
| |
| /** |
| * Read metadata from reader. |
| * |
| * @param reader reader to read from |
| * @return Metadata or null if nothing could be read from the reader |
| * @throws TikaException in case of parse failure by Gson or IO failure with Reader |
| */ |
| public static Metadata fromJson(Reader reader) throws TikaException { |
| Metadata m = null; |
| try { |
| m = GSON.fromJson(reader, Metadata.class); |
| } catch (com.google.gson.JsonParseException e){ |
| //covers both io and parse exceptions |
| throw new TikaException(e.getMessage()); |
| } |
| return m; |
| } |
| |
| /** |
| * Enables setting custom configurations on Gson. Remember to register |
| * a serializer and a deserializer for Metadata. This does a literal set |
| * and does not add the default serializer and deserializers. |
| * |
| * @param gson |
| */ |
| public static void setGson(Gson gson) { |
| GSON = gson; |
| } |
| |
| public static void setPrettyPrinting(boolean prettyPrint) { |
| if (prettyPrint) { |
| GSON = prettyInit(); |
| } else { |
| GSON = defaultInit(); |
| } |
| } |
| |
| } |