| /* |
| * 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.cm.json.impl; |
| |
| import java.lang.reflect.Array; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| |
| import javax.json.Json; |
| import javax.json.JsonArrayBuilder; |
| import javax.json.JsonValue; |
| |
| import org.osgi.util.converter.Converters; |
| import org.osgi.util.converter.TypeReference; |
| |
| public class TypeConverter { |
| |
| public static final String TYPE_BINARY = "binary"; |
| |
| public static final String TYPE_BINARIES = "binary[]"; |
| |
| private static final String TYPE_COLLECTION = "Collection"; |
| |
| public static final String NO_TYPE_INFO = ""; |
| |
| public static final Object CONVERSION_FAILED = new Object(); |
| |
| private static final Map<String, Class<?>> TYPE_MAP = new LinkedHashMap<>(); |
| private static final Map<String, TypeReference<?>> TYPE_COLLECTION_MAP = new LinkedHashMap<>(); |
| static { |
| // scalar types and primitive types |
| TYPE_MAP.put("String", String.class); |
| TYPE_MAP.put("Integer", Integer.class); |
| TYPE_MAP.put("int", Integer.class); |
| TYPE_MAP.put("Long", Long.class); |
| TYPE_MAP.put("long", Long.class); |
| TYPE_MAP.put("Float", Float.class); |
| TYPE_MAP.put("float", Float.class); |
| TYPE_MAP.put("Double", Double.class); |
| TYPE_MAP.put("double", Double.class); |
| TYPE_MAP.put("Byte", Byte.class); |
| TYPE_MAP.put("byte", Byte.class); |
| TYPE_MAP.put("Short", Short.class); |
| TYPE_MAP.put("short", Short.class); |
| TYPE_MAP.put("Character", Character.class); |
| TYPE_MAP.put("char", Character.class); |
| TYPE_MAP.put("Boolean", Boolean.class); |
| TYPE_MAP.put("boolean", Boolean.class); |
| // array of scalar types and primitive types |
| TYPE_MAP.put("String[]", String[].class); |
| TYPE_MAP.put("int[]", int[].class); |
| TYPE_MAP.put("Integer[]", Integer[].class); |
| TYPE_MAP.put("long[]", long[].class); |
| TYPE_MAP.put("Long[]", Long[].class); |
| TYPE_MAP.put("float[]", float[].class); |
| TYPE_MAP.put("Float[]", Float[].class); |
| TYPE_MAP.put("double[]", double[].class); |
| TYPE_MAP.put("Double[]", Double[].class); |
| TYPE_MAP.put("byte[]", byte[].class); |
| TYPE_MAP.put("Byte[]", Byte[].class); |
| TYPE_MAP.put("short[]", short[].class); |
| TYPE_MAP.put("Short[]", Short[].class); |
| TYPE_MAP.put("boolean[]", boolean[].class); |
| TYPE_MAP.put("Boolean[]", Boolean[].class); |
| TYPE_MAP.put("char[]", char[].class); |
| TYPE_MAP.put("Character[]", Character[].class); |
| |
| // binaries |
| TYPE_MAP.put(TYPE_BINARY, String.class); |
| TYPE_MAP.put(TYPE_BINARIES, String[].class); |
| |
| // Collections of scalar types |
| TYPE_COLLECTION_MAP.put("Collection<String>", new TypeReference<ArrayList<String>>() { |
| }); |
| TYPE_COLLECTION_MAP.put("Collection<Integer>", new TypeReference<ArrayList<Integer>>() { |
| }); |
| TYPE_COLLECTION_MAP.put("Collection<Long>", new TypeReference<ArrayList<Long>>() { |
| }); |
| TYPE_COLLECTION_MAP.put("Collection<Float>", new TypeReference<ArrayList<Float>>() { |
| }); |
| TYPE_COLLECTION_MAP.put("Collection<Double>", new TypeReference<ArrayList<Double>>() { |
| }); |
| TYPE_COLLECTION_MAP.put("Collection<Byte>", new TypeReference<ArrayList<Byte>>() { |
| }); |
| TYPE_COLLECTION_MAP.put("Collection<Short>", new TypeReference<ArrayList<Short>>() { |
| }); |
| TYPE_COLLECTION_MAP.put("Collection<Character>", new TypeReference<ArrayList<Character>>() { |
| }); |
| TYPE_COLLECTION_MAP.put("Collection<Boolean>", new TypeReference<ArrayList<Boolean>>() { |
| }); |
| } |
| |
| /** |
| * Convert a value to the given type |
| * |
| * @param value The json value |
| * @param typeInfo Optional type info |
| * @return The converted value or {@code CONVERSION_FAILED} if the conversion failed. |
| * @throws IllegalArgumentException If the type is unknown |
| */ |
| public static Object convertObjectToType( |
| final JsonValue jsonValue, |
| final String typeInfo) throws IllegalArgumentException { |
| final Object value = JsonSupport.convertToObject(jsonValue); |
| if (typeInfo == null) { |
| return value; |
| } |
| final Class<?> typeClass = TYPE_MAP.get(typeInfo); |
| if ( typeClass != null ) { |
| Object result = Converters.standardConverter().convert(value).defaultValue(null).to(typeClass); |
| if (result == null && value != null) { |
| result = CONVERSION_FAILED; |
| } |
| return result; |
| } |
| final TypeReference<?> typeReference = TYPE_COLLECTION_MAP.get(typeInfo); |
| if (typeReference != null) { |
| if (value == null) { |
| return Collections.EMPTY_LIST; |
| } |
| Object result = Converters.standardConverter().convert(value).defaultValue(null).to(typeReference); |
| if (result == null) { |
| result = CONVERSION_FAILED; |
| } |
| return result; |
| } |
| |
| // raw collection |
| if (TYPE_COLLECTION.equals(typeInfo)) { |
| if (value == null) { |
| return Collections.EMPTY_LIST; |
| } else if (value instanceof String || value instanceof Boolean || value instanceof Long |
| || value instanceof Double) { |
| return Collections.singletonList(value); |
| } |
| final Collection<Object> c = new ArrayList<>(); |
| for (int i = 0; i < Array.getLength(value); i++) { |
| c.add(Array.get(value, i)); |
| } |
| return Collections.unmodifiableCollection(c); |
| } |
| |
| // unknown type |
| return CONVERSION_FAILED; |
| } |
| |
| private static String findType(final Class<?> clazz) { |
| for (final Map.Entry<String, Class<?>> entry : TYPE_MAP.entrySet()) { |
| if (clazz.isAssignableFrom(entry.getValue())) { |
| return entry.getKey(); |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Convert an object to a {@code JsonValue}. |
| * |
| * @param value The object to convert |
| * @return A map entry where the key contains the type info and the value the |
| * converted JsonValue. |
| */ |
| public static Map.Entry<String, JsonValue> convertObjectToTypedJsonValue(final Object value) { |
| // native types |
| if (value == null || value instanceof Long || value instanceof Double || value instanceof String |
| || value instanceof Boolean) { |
| return new Entry(NO_TYPE_INFO, JsonSupport.convertToJson(value)); |
| } |
| |
| if (value.getClass().isArray()) { |
| // arrays |
| String typeInfo = findType(value.getClass()); |
| if (typeInfo != null) { |
| if ("String[]".equals(typeInfo) || "Boolean[]".equals(typeInfo) || "Long[]".equals(typeInfo) |
| || "Double[]".equals(typeInfo)) { |
| typeInfo = NO_TYPE_INFO; |
| } |
| final JsonArrayBuilder jab = Json.createArrayBuilder(); |
| for (int i = 0; i < Array.getLength(value); i++) { |
| jab.add(convertObjectToTypedJsonValue(Array.get(value, i)).getValue()); |
| } |
| |
| return new Entry(typeInfo, jab.build()); |
| } |
| |
| } else if (Collection.class.isAssignableFrom(value.getClass())) { |
| // collections |
| final Collection<?> collection = (Collection<?>) value; |
| // get first object to get the type |
| String typeInfo = TypeConverter.TYPE_COLLECTION; |
| final Iterator<?> i = collection.iterator(); |
| if (i.hasNext()) { |
| final String colType = findType(i.next().getClass()); |
| if (colType != null) { |
| typeInfo = typeInfo.concat("<").concat(colType).concat(">"); |
| } |
| } |
| final JsonArrayBuilder jab = Json.createArrayBuilder(); |
| for (final Object obj : collection) { |
| jab.add(JsonSupport.convertToJson(obj)); |
| } |
| return new Entry(typeInfo, jab.build()); |
| } |
| |
| // scalar types - start with special cases for numbers |
| if (value instanceof Integer) { |
| return new Entry("Integer", Json.createValue((Integer) value)); |
| } else if (value instanceof Float) { |
| return new Entry("Float", Json.createValue((Float) value)); |
| } else if (value instanceof Short) { |
| return new Entry("Short", Json.createValue((Short) value)); |
| } else if (value instanceof Byte) { |
| return new Entry("Byte", Json.createValue((Byte) value)); |
| } else if (value instanceof Character) { |
| return new Entry("Character", Json.createValue(value.toString())); |
| } |
| final String typeInfo = findType(value.getClass()); |
| if (typeInfo != null) { |
| return new Entry(typeInfo, JsonSupport.convertToJson(value.toString())); |
| } |
| |
| return new Entry(NO_TYPE_INFO, JsonSupport.convertToJson(value)); |
| } |
| |
| private static final class Entry implements Map.Entry<String, JsonValue> { |
| |
| private final JsonValue value; |
| private final String type; |
| |
| public Entry(final String type, final JsonValue value) { |
| this.type = type; |
| this.value = value; |
| } |
| |
| @Override |
| public String getKey() { |
| return this.type; |
| } |
| |
| @Override |
| public JsonValue getValue() { |
| return this.value; |
| } |
| |
| @Override |
| public JsonValue setValue(JsonValue value) { |
| return null; |
| } |
| } |
| } |