| /* |
| * 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.felix.dm.annotation.plugin.bnd; |
| |
| import java.lang.reflect.Array; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.Set; |
| import java.util.function.Function; |
| |
| /** |
| * Class used to serialize a map into the json format. |
| * Code adapted from Apache Felix Converter (org.apache.felix.serializer.impl.json.JsonSerializingImpl) |
| * |
| * The JSON output is parsed into an object structure in the following way: |
| * <ul> |
| * <li>Object names are represented as a {@link String}. |
| * <li>String values are represented as a {@link String}. |
| * <li>Numeric values without a decimal separator are represented as a {@link Long}. |
| * <li>Numeric values with a decimal separator are represented as a {@link Double}. |
| * <li>Boolean values are represented as a {@link Boolean}. |
| * <li>Nested JSON objects are parsed into a {@link java.util.Map Map<String, Object>}. |
| * <li>JSON lists are parsed into a {@link java.util.List} which may contain any of the above values. |
| * </ul> |
| */ |
| public class JsonWriter { |
| private final Object object; |
| private final boolean ignoreNull; |
| private final Function<Object, String> converter; |
| |
| JsonWriter(Object object) { |
| this(object, null, false); |
| } |
| |
| JsonWriter(Object object, Function<Object, String> converter, boolean ignoreNull) { |
| this.object = object; |
| this.converter = converter; |
| this.ignoreNull = ignoreNull; |
| } |
| |
| @Override |
| public String toString() { |
| return encode(object); |
| } |
| |
| @SuppressWarnings("rawtypes") |
| private String encode(Object obj) { |
| if (obj == null) { |
| return ignoreNull ? "" : "null"; |
| } |
| |
| if (obj instanceof Map) { |
| return encodeMap((Map) obj); |
| } else if (obj instanceof Collection) { |
| return encodeCollection((Collection) obj); |
| } else if (obj.getClass().isArray()) { |
| return encodeCollection(asCollection(obj)); |
| } else if (obj instanceof Number) { |
| return obj.toString(); |
| } else if (obj instanceof Boolean) { |
| return obj.toString(); |
| } |
| |
| String result = (converter != null) ? converter.apply(obj) : obj.toString(); |
| return "\"" + result + "\""; |
| } |
| |
| private Collection<?> asCollection(Object arr) { |
| // Arrays.asList() doesn't work for primitive arrays |
| int len = Array.getLength(arr); |
| List<Object> l = new ArrayList<>(len); |
| for (int i=0; i<len; i++) { |
| l.add(Array.get(arr, i)); |
| } |
| return l; |
| } |
| |
| private String encodeCollection(Collection<?> collection) { |
| StringBuilder sb = new StringBuilder("["); |
| |
| boolean first = true; |
| for (Object o : collection) { |
| if (first) |
| first = false; |
| else |
| sb.append(','); |
| |
| sb.append(encode(o)); |
| } |
| |
| sb.append("]"); |
| return sb.toString(); |
| } |
| |
| @SuppressWarnings({ "rawtypes", "unchecked" }) |
| private String encodeMap(Map m) { |
| StringBuilder sb = new StringBuilder("{"); |
| for (Entry entry : (Set<Entry>) m.entrySet()) { |
| if (entry.getKey() == null || entry.getValue() == null) |
| if (ignoreNull) |
| continue; |
| |
| if (sb.length() > 1) |
| sb.append(','); |
| sb.append('"'); |
| sb.append(entry.getKey().toString()); |
| sb.append("\":"); |
| sb.append(encode(entry.getValue())); |
| } |
| sb.append("}"); |
| |
| return sb.toString(); |
| } |
| } |