| /* |
| * 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.sling.servlets.post; |
| |
| |
| import org.apache.sling.jcr.contentparser.impl.JsonTicksConverter; |
| |
| import javax.json.Json; |
| import javax.json.JsonArrayBuilder; |
| import javax.json.JsonObject; |
| import javax.json.JsonObjectBuilder; |
| import javax.json.JsonStructure; |
| import javax.servlet.http.HttpServletResponse; |
| import java.io.IOException; |
| import java.io.StringReader; |
| import java.math.BigDecimal; |
| import java.math.BigInteger; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * The <code>JSONResponse</code> is an {@link AbstractPostResponse} preparing |
| * the response in JSON. |
| */ |
| public class JSONResponse extends AbstractPostResponse { |
| |
| public static final String RESPONSE_CONTENT_TYPE = "application/json"; |
| |
| // package private because it is used by the unit test |
| static final String PROP_TYPE = "type"; |
| |
| // package private because it is used by the unit test |
| static final String PROP_ARGUMENT = "argument"; |
| |
| // package private because it is used by the unit test |
| static final String RESPONSE_CHARSET = "UTF-8"; |
| |
| private static final String PROP_CHANGES = "changes"; |
| |
| private Map<String, Object> json = new HashMap<>(); |
| |
| private Map<String, JsonStructure> jsonCached = new HashMap<>(); |
| |
| private List<Map<String, Object>> changes = new ArrayList<>(); |
| |
| private Throwable error; |
| |
| public void onChange(String type, String... arguments) { |
| Map<String,Object> change = new HashMap<>(); |
| change.put(PROP_TYPE, type); |
| |
| if (arguments.length > 1) { |
| change.put(PROP_ARGUMENT, Arrays.asList(arguments)); |
| } |
| else if (arguments.length == 1) { |
| change.put(PROP_ARGUMENT, arguments[0]); |
| } |
| changes.add(change); |
| } |
| |
| @Override |
| public void setError(Throwable error) { |
| this.error = error; |
| } |
| |
| @Override |
| public Throwable getError() { |
| return this.error; |
| } |
| |
| /** |
| * This method accepts values that correspond to json primitives or otherwise assumes that the toString() of the value |
| * can be parsed as json. If neither is the case it will throw an Exception. |
| * |
| * Assuming the above holds, it will put the value as json directly into the json value part of the response. |
| * |
| * @param name name of the property |
| * @param value value of the property - either of type {String, Boolean, Number, null} |
| * or the toString() is parseable as json |
| * @throws JSONResponseException if the value is not usable |
| */ |
| @Override |
| public void setProperty(String name, Object value) { |
| if (value instanceof String || value instanceof Boolean || value instanceof Number || value == null) { |
| json.put(name, value); |
| } |
| else { |
| try { |
| String valueString = JsonTicksConverter.tickToDoubleQuote(value.toString()); |
| jsonCached.put(name, Json.createReader(new StringReader(valueString)).read()); |
| json.put(name, value); |
| } catch (Exception ex) { |
| throw new JSONResponseException(ex); |
| } |
| } |
| } |
| |
| @Override |
| public Object getProperty(String name) { |
| return PROP_CHANGES.equals(name) ? getJson().getJsonArray(PROP_CHANGES) : |
| "error".equals(name) && this.error != null ? getJson().get("error") : json.get(name); |
| } |
| |
| @SuppressWarnings({ "ThrowableResultOfMethodCallIgnored" }) |
| @Override |
| protected void doSend(HttpServletResponse response) throws IOException { |
| |
| response.setContentType(RESPONSE_CONTENT_TYPE); |
| response.setCharacterEncoding(RESPONSE_CHARSET); |
| |
| Json.createGenerator(response.getWriter()).write(getJson()).close(); |
| } |
| |
| JsonObject getJson() { |
| JsonObjectBuilder jsonBuilder = Json.createObjectBuilder(); |
| for (Map.Entry<String, Object> entry : json.entrySet()) { |
| Object value = entry.getValue(); |
| if (value instanceof String) { |
| jsonBuilder.add(entry.getKey(), (String) entry.getValue()); |
| } |
| else if (value instanceof Boolean) { |
| jsonBuilder.add(entry.getKey(), (Boolean) value); |
| } |
| else if (value instanceof BigInteger) { |
| jsonBuilder.add(entry.getKey(), (BigInteger) value); |
| } |
| else if (value instanceof BigDecimal) { |
| jsonBuilder.add(entry.getKey(), (BigDecimal) value); |
| } |
| else if (value instanceof Byte) { |
| jsonBuilder.add(entry.getKey(), (Byte) value); |
| } |
| else if (value instanceof Short) { |
| jsonBuilder.add(entry.getKey(), (Short) value); |
| } |
| else if (value instanceof Integer) { |
| jsonBuilder.add(entry.getKey(), (Integer) value); |
| } |
| else if (value instanceof Long) { |
| jsonBuilder.add(entry.getKey(), (Long) value); |
| } |
| else if (value instanceof Double) { |
| jsonBuilder.add(entry.getKey(), (Double) value); |
| } |
| else if (value instanceof Float) { |
| jsonBuilder.add(entry.getKey(), (Float) value); |
| } |
| else if (value == null) { |
| jsonBuilder.addNull(entry.getKey()); |
| } |
| else { |
| jsonBuilder.add(entry.getKey(), jsonCached.get(entry.getKey())); |
| } |
| } |
| if (this.error != null) { |
| jsonBuilder |
| .add("error", Json.createObjectBuilder() |
| .add("class", error.getClass().getName()) |
| .add("message", error.getMessage())); |
| } |
| JsonArrayBuilder changesBuilder = Json.createArrayBuilder(); |
| if (this.error == null) { |
| for (Map<String, Object> entry : changes) { |
| JsonObjectBuilder entryBuilder = Json.createObjectBuilder(); |
| entryBuilder.add(PROP_TYPE, (String) entry.get(PROP_TYPE)); |
| |
| Object arguments = entry.get(PROP_ARGUMENT); |
| |
| if (arguments != null) { |
| if (arguments instanceof List) { |
| JsonArrayBuilder argumentsBuilder = Json.createArrayBuilder(); |
| |
| for (String argument : ((List<String>) arguments)) { |
| if(argument != null) { |
| argumentsBuilder.add(argument); |
| } |
| } |
| |
| entryBuilder.add(PROP_ARGUMENT, argumentsBuilder); |
| } else { |
| entryBuilder.add(PROP_ARGUMENT, (String) arguments); |
| } |
| } |
| changesBuilder.add(entryBuilder); |
| } |
| } |
| jsonBuilder.add(PROP_CHANGES, changesBuilder); |
| return jsonBuilder.build(); |
| } |
| |
| public class JSONResponseException extends RuntimeException { |
| public JSONResponseException(String message, Throwable exception) { |
| super(message, exception); |
| } |
| public JSONResponseException(Throwable e) { |
| super("Error building JSON response", e); |
| } |
| } |
| } |