| /* |
| * 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. |
| */ |
| package org.apache.johnzon.mapper; |
| |
| import javax.json.JsonReader; |
| import javax.json.JsonReaderFactory; |
| import javax.json.JsonValue; |
| import javax.json.stream.JsonGeneratorFactory; |
| import javax.json.stream.JsonParser; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| |
| import static java.util.Optional.ofNullable; |
| |
| public final class JohnzonCores { |
| private static final Method CREATE_READER; |
| |
| static { |
| Method m = null; |
| try { |
| final Class<?> jrfi = ofNullable(JohnzonCores.class.getClassLoader()) |
| .orElseGet(ClassLoader::getSystemClassLoader) |
| .loadClass("org.apache.johnzon.core.JsonReaderFactoryImpl"); |
| m = jrfi.getDeclaredMethod("createReader", JsonParser.class); |
| if (!m.isAccessible()) { |
| m.setAccessible(true); |
| } |
| } catch (final Exception e) { |
| // no-op |
| } |
| CREATE_READER = m; |
| } |
| |
| private JohnzonCores() { |
| // no-op |
| } |
| |
| public static SnippetFactory snippetFactory(final int max, final JsonGeneratorFactory factory) { |
| if (CREATE_READER == null) { |
| return JsonValue::toString; |
| } |
| return Snippets.of(max, factory); |
| } |
| |
| public static JsonReader map(final JsonParser parser, final JsonReaderFactory readerFactory) { |
| if (CREATE_READER == null) { |
| throw new IllegalStateException("Ensure to use johnzon-core as JSON-P provider for johnzon-mapper"); |
| } |
| try { |
| return JsonReader.class.cast(CREATE_READER.invoke(readerFactory, parser)); |
| } catch (final IllegalAccessException e) { |
| throw new IllegalStateException(e); |
| } catch (final InvocationTargetException e) { |
| throw new IllegalStateException(e.getTargetException()); |
| } |
| } |
| |
| // indirection (for classloading) |
| private static class Snippets { |
| private Snippets() { |
| // no-op |
| } |
| |
| private static SnippetFactory of(final int max, final JsonGeneratorFactory factory) { |
| return new org.apache.johnzon.core.Snippet(max, factory)::of; |
| } |
| } |
| } |