Java tutorial
/* * Copyright 2012 Erlend Hamnaberg * * 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 net.hamnaberg.json.parser; import net.hamnaberg.json.*; import net.hamnaberg.json.Collection; import net.hamnaberg.json.util.Charsets; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.node.ObjectNode; import java.io.*; /** * Parser for a vnd.collection+json document. */ public class CollectionParser { private final ObjectMapper mapper = new ObjectMapper(); public Collection parse(Reader reader) throws IOException { try { return parse(mapper.readTree(reader)); } finally { if (reader != null) { reader.close(); } } } /** * Parses a Collection from the given stream. * The stream is wrapped in a BufferedReader. * <p> * The stream is expected to be UTF-8 encoded. * * @param stream the stream * @return a Collection * @throws IOException */ public Collection parse(InputStream stream) throws IOException { return parse(new BufferedReader(new InputStreamReader(stream, Charsets.UTF_8))); } /** * Parses a Collection from the given String. * * @param input the string to parse * @return a Collection * @throws IOException */ public Collection parse(String input) throws IOException { return parse(new StringReader(input)); } public Template parseTemplate(Reader reader) throws IOException { try { return parseTemplate(mapper.readTree(reader)); } finally { if (reader != null) { reader.close(); } } } /** * Parses a JsonCollection from the given stream. * The stream is wrapped in a BufferedReader. * <p> * The stream is expected to be UTF-8 encoded. * * @param stream the stream * @return a jsonCollection * @throws IOException */ public Template parseTemplate(InputStream stream) throws IOException { return parseTemplate(new BufferedReader(new InputStreamReader(stream, Charsets.UTF_8))); } public Template parseTemplate(String input) throws IOException { return parseTemplate(new StringReader(input)); } private Collection parse(JsonNode node) throws ParseException { JsonNode collectionNode = node.get("collection"); if (collectionNode != null) { return parseCollection(collectionNode); } throw new ParseException("Missing \"collection\" property"); } private Collection parseCollection(JsonNode collectionNode) { Collection c = objectFactory.createCollection((ObjectNode) collectionNode); c.validate(); return c; } private Template parseTemplate(JsonNode collectionNode) throws ParseException { JsonNode node = collectionNode.get("template"); if (node != null) { return objectFactory.createTemplate((ObjectNode) node); } throw new ParseException("Missing \"template\" property"); } private static InternalObjectFactory objectFactory = new InternalObjectFactory() { }; }