| /******************************************************************************* |
| * 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.ofbiz.base.lang; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.Reader; |
| |
| import org.apache.commons.io.IOUtils; |
| import org.apache.ofbiz.base.util.Assert; |
| |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| |
| /** A JSON object. */ |
| @ThreadSafe |
| public final class JSON { |
| |
| // TODO: Find a generic way to modify mapper options |
| private static final ObjectMapper mapper = new ObjectMapper(); |
| |
| /** |
| * Creates a <code>JSON</code> instance from an <code>InputStream</code>. |
| * The method assumes the character set is UTF-8. |
| * |
| * @param inStream |
| * @return a <code>JSON</code> instance |
| * @throws IOException |
| */ |
| public static JSON from(InputStream inStream) throws IOException { |
| Assert.notNull("inStream", inStream); |
| String jsonString = IOUtils.toString(inStream, "UTF-8"); |
| return from(jsonString); |
| } |
| |
| /** |
| * Creates a <code>JSON</code> instance from an unknown data type. |
| * |
| * @param object |
| * @return a <code>JSON</code> instance |
| * @throws IOException |
| */ |
| public static JSON from(Object object) throws IOException { |
| Assert.notNull("object", object); |
| try { |
| return from(mapper.writeValueAsString(object)); |
| } catch (Exception e) { |
| throw new IOException(e); |
| } |
| } |
| |
| /** |
| * Creates a <code>JSON</code> instance from a <code>Reader</code>. |
| * |
| * @param reader |
| * @return a <code>JSON</code> instance |
| * @throws IOException |
| */ |
| public static JSON from(Reader reader) throws IOException { |
| Assert.notNull("reader", reader); |
| String jsonString = IOUtils.toString(reader); |
| return from(jsonString); |
| } |
| |
| /** |
| * Creates a <code>JSON</code> instance from a <code>String</code>. |
| * |
| * @param jsonString |
| * @return a <code>JSON</code> instance |
| */ |
| public static JSON from(String jsonString) { |
| Assert.notNull("jsonString", jsonString); |
| // TODO: Validate String |
| return new JSON(jsonString); |
| } |
| |
| private final String jsonString; |
| |
| private JSON(String jsonString) { |
| this.jsonString = jsonString; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == this) { |
| return true; |
| } |
| if (obj instanceof JSON) { |
| return jsonString.equals(((JSON)obj).jsonString); |
| } |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| return jsonString.hashCode(); |
| } |
| |
| /** |
| * Converts this <code>JSON</code> object to the specified type. |
| * |
| * @param targetClass |
| * @return an object of the specified type |
| * @throws IOException |
| */ |
| public <T> T toObject(Class<T> targetClass) throws IOException { |
| Assert.notNull("targetClass", targetClass); |
| try { |
| return mapper.readValue(jsonString, targetClass); |
| } catch (IOException e) { |
| throw e; |
| } catch (Exception e) { |
| throw new IOException(e); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return jsonString; |
| } |
| } |