com.google.api.client.util.ClassInfo Java Examples

/** Sets the entry classes to use when parsing. */
public void setEntryClasses(Class<?>... entryClasses) {
  int numEntries = entryClasses.length;
  HashMap<String, Class<?>> kindToEntryClassMap = this.kindToEntryClassMap;
  for (int i = 0; i < numEntries; i++) {
    Class<?> entryClass = entryClasses[i];
    ClassInfo typeInfo = ClassInfo.of(entryClass);
    Field field = typeInfo.getField("@gd:kind");
    if (field == null) {
      throw new IllegalArgumentException("missing @gd:kind field for " + entryClass.getName());
    }
    Object entry = Types.newInstance(entryClass);
    String kind = (String) FieldInfo.getFieldValue(field, entry);
    if (kind == null) {
      throw new IllegalArgumentException(
          "missing value for @gd:kind field in " + entryClass.getName());
    }
    kindToEntryClassMap.put(kind, entryClass);
  }
}
 

/**
 * Initializes a new ParseHeaderState.
 *
 * @param headers HttpHeaders object for which the headers are being parsed
 * @param logger Logger if logging is enabled or {@code null}
 */
public ParseHeaderState(HttpHeaders headers, StringBuilder logger) {
  Class<? extends HttpHeaders> clazz = headers.getClass();
  this.context = Arrays.<Type>asList(clazz);
  this.classInfo = ClassInfo.of(clazz, true);
  this.logger = logger;
  this.arrayValueMap = new ArrayValueMap(headers);
}
 

private static Set<String> getGenericDataFieldNames(TypeToken<?> type) {
  if (!Types.isJavaClientEntity(type)) {
    return null;
  }
  return ImmutableSet.copyOf(ClassInfo.of(type.getRawType(), false /* ignoreCase */).getNames());
}
 

/**
 * Parses the next field from the given JSON parser into the given destination object.
 *
 * @param context destination context stack (possibly empty)
 * @param destination destination object instance or {@code null} for none (for example empty
 *     context stack)
 * @param customizeParser optional parser customizer or {@code null} for none
 */
private void parse(
    ArrayList<Type> context, Object destination, CustomizeJsonParser customizeParser)
    throws IOException {
  if (destination instanceof GenericJson) {
    ((GenericJson) destination).setFactory(getFactory());
  }
  JsonToken curToken = startParsingObjectOrArray();
  Class<?> destinationClass = destination.getClass();
  ClassInfo classInfo = ClassInfo.of(destinationClass);
  boolean isGenericData = GenericData.class.isAssignableFrom(destinationClass);
  if (!isGenericData && Map.class.isAssignableFrom(destinationClass)) {
    // The destination class is not a sub-class of GenericData but is of Map, so parse data
    // using parseMap.
    @SuppressWarnings("unchecked")
    Map<String, Object> destinationMap = (Map<String, Object>) destination;
    parseMap(
        null,
        destinationMap,
        Types.getMapValueParameter(destinationClass),
        context,
        customizeParser);
    return;
  }
  while (curToken == JsonToken.FIELD_NAME) {
    String key = getText();
    nextToken();
    // stop at items for feeds
    if (customizeParser != null && customizeParser.stopAt(destination, key)) {
      return;
    }
    // get the field from the type information
    FieldInfo fieldInfo = classInfo.getFieldInfo(key);
    if (fieldInfo != null) {
      // skip final fields
      if (fieldInfo.isFinal() && !fieldInfo.isPrimitive()) {
        throw new IllegalArgumentException("final array/object fields are not supported");
      }
      Field field = fieldInfo.getField();
      int contextSize = context.size();
      context.add(field.getGenericType());
      Object fieldValue =
          parseValue(
              field, fieldInfo.getGenericType(), context, destination, customizeParser, true);
      context.remove(contextSize);
      fieldInfo.setValue(destination, fieldValue);
    } else if (isGenericData) {
      // store unknown field in generic JSON
      GenericData object = (GenericData) destination;
      object.set(key, parseValue(null, null, context, destination, customizeParser, true));
    } else {
      // unrecognized field, skip value.
      if (customizeParser != null) {
        customizeParser.handleUnrecognizedKey(destination, key);
      }
      skipChildren();
    }
    curToken = nextToken();
  }
}
 

/**
 * Finds the {@link Field} on the given {@link Class} that has the {@link JsonPolymorphicTypeMap}
 * annotation, or {@code null} if there is none.
 *
 * <p>The class must contain exactly zero or one {@link JsonPolymorphicTypeMap} annotation.
 *
 * @param key The {@link Class} to search in, or {@code null}
 * @return The {@link Field} with the {@link JsonPolymorphicTypeMap} annotation, or {@code null}
 *     either if there is none or if the key is {@code null}
 */
private static Field getCachedTypemapFieldFor(Class<?> key) {
  if (key == null) {
    return null;
  }
  lock.lock();
  try {
    // Must use containsKey because we do store null values for when the class has no
    // JsonPolymorphicTypeMap field.
    if (cachedTypemapFields.containsKey(key)) {
      return cachedTypemapFields.get(key);
    }
    // Find the field that determines the type and cache it.
    Field value = null;
    Collection<FieldInfo> fieldInfos = ClassInfo.of(key).getFieldInfos();
    for (FieldInfo fieldInfo : fieldInfos) {
      Field field = fieldInfo.getField();
      JsonPolymorphicTypeMap typemapAnnotation =
          field.getAnnotation(JsonPolymorphicTypeMap.class);
      if (typemapAnnotation != null) {
        Preconditions.checkArgument(
            value == null,
            "Class contains more than one field with @JsonPolymorphicTypeMap annotation: %s",
            key);
        Preconditions.checkArgument(
            Data.isPrimitive(field.getType()),
            "Field which has the @JsonPolymorphicTypeMap, %s, is not a supported type: %s",
            key,
            field.getType());
        value = field;
        // Check for duplicate typeDef keys
        TypeDef[] typeDefs = typemapAnnotation.typeDefinitions();
        HashSet<String> typeDefKeys = Sets.newHashSet();
        Preconditions.checkArgument(
            typeDefs.length > 0, "@JsonPolymorphicTypeMap must have at least one @TypeDef");
        for (TypeDef typeDef : typeDefs) {
          Preconditions.checkArgument(
              typeDefKeys.add(typeDef.key()),
              "Class contains two @TypeDef annotations with identical key: %s",
              typeDef.key());
        }
      }
    }
    cachedTypemapFields.put(key, value);
    return value;
  } finally {
    lock.unlock();
  }
}
 

private void serialize(boolean isJsonString, Object value) throws IOException {
  if (value == null) {
    return;
  }
  Class<?> valueClass = value.getClass();
  if (Data.isNull(value)) {
    writeNull();
  } else if (value instanceof String) {
    writeString((String) value);
  } else if (value instanceof Number) {
    if (isJsonString) {
      writeString(value.toString());
    } else if (value instanceof BigDecimal) {
      writeNumber((BigDecimal) value);
    } else if (value instanceof BigInteger) {
      writeNumber((BigInteger) value);
    } else if (value instanceof Long) {
      writeNumber((Long) value);
    } else if (value instanceof Float) {
      float floatValue = ((Number) value).floatValue();
      Preconditions.checkArgument(!Float.isInfinite(floatValue) && !Float.isNaN(floatValue));
      writeNumber(floatValue);
    } else if (value instanceof Integer || value instanceof Short || value instanceof Byte) {
      writeNumber(((Number) value).intValue());
    } else {
      double doubleValue = ((Number) value).doubleValue();
      Preconditions.checkArgument(!Double.isInfinite(doubleValue) && !Double.isNaN(doubleValue));
      writeNumber(doubleValue);
    }
  } else if (value instanceof Boolean) {
    writeBoolean((Boolean) value);
  } else if (value instanceof DateTime) {
    writeString(((DateTime) value).toStringRfc3339());
  } else if ((value instanceof Iterable<?> || valueClass.isArray())
      && !(value instanceof Map<?, ?>)
      && !(value instanceof GenericData)) {
    writeStartArray();
    for (Object o : Types.iterableOf(value)) {
      serialize(isJsonString, o);
    }
    writeEndArray();
  } else if (valueClass.isEnum()) {
    String name = FieldInfo.of((Enum<?>) value).getName();
    if (name == null) {
      writeNull();
    } else {
      writeString(name);
    }
  } else {
    writeStartObject();
    // only inspect fields of POJO (possibly extends GenericData) but not generic Map
    boolean isMapNotGenericData = value instanceof Map<?, ?> && !(value instanceof GenericData);
    ClassInfo classInfo = isMapNotGenericData ? null : ClassInfo.of(valueClass);
    for (Map.Entry<String, Object> entry : Data.mapOf(value).entrySet()) {
      Object fieldValue = entry.getValue();
      if (fieldValue != null) {
        String fieldName = entry.getKey();
        boolean isJsonStringForField;
        if (isMapNotGenericData) {
          isJsonStringForField = isJsonString;
        } else {
          Field field = classInfo.getField(fieldName);
          isJsonStringForField = field != null && field.getAnnotation(JsonString.class) != null;
        }
        writeFieldName(fieldName);
        serialize(isJsonStringForField, fieldValue);
      }
    }
    writeEndObject();
  }
}
 

/** Parses the specified case-insensitive header pair into this HttpHeaders instance. */
void parseHeader(String headerName, String headerValue, ParseHeaderState state) {
  List<Type> context = state.context;
  ClassInfo classInfo = state.classInfo;
  ArrayValueMap arrayValueMap = state.arrayValueMap;
  StringBuilder logger = state.logger;

  if (logger != null) {
    logger.append(headerName + ": " + headerValue).append(StringUtils.LINE_SEPARATOR);
  }
  // use field information if available
  FieldInfo fieldInfo = classInfo.getFieldInfo(headerName);
  if (fieldInfo != null) {
    Type type = Data.resolveWildcardTypeOrTypeVariable(context, fieldInfo.getGenericType());
    // type is now class, parameterized type, or generic array type
    if (Types.isArray(type)) {
      // array that can handle repeating values
      Class<?> rawArrayComponentType =
          Types.getRawArrayComponentType(context, Types.getArrayComponentType(type));
      arrayValueMap.put(
          fieldInfo.getField(),
          rawArrayComponentType,
          parseValue(rawArrayComponentType, context, headerValue));
    } else if (Types.isAssignableToOrFrom(
        Types.getRawArrayComponentType(context, type), Iterable.class)) {
      // iterable that can handle repeating values
      @SuppressWarnings("unchecked")
      Collection<Object> collection = (Collection<Object>) fieldInfo.getValue(this);
      if (collection == null) {
        collection = Data.newCollectionInstance(type);
        fieldInfo.setValue(this, collection);
      }
      Type subFieldType = type == Object.class ? null : Types.getIterableParameter(type);
      collection.add(parseValue(subFieldType, context, headerValue));
    } else {
      // parse value based on field type
      fieldInfo.setValue(this, parseValue(type, context, headerValue));
    }
  } else {
    // store header values in an array list
    @SuppressWarnings("unchecked")
    ArrayList<String> listValue = (ArrayList<String>) this.get(headerName);
    if (listValue == null) {
      listValue = new ArrayList<String>();
      this.set(headerName, listValue);
    }
    listValue.add(headerValue);
  }
}
 

private static void appendFieldsFor(
    StringBuilder fieldsBuf, Class<?> dataClass, int[] numFields) {
  if (Map.class.isAssignableFrom(dataClass) || Collection.class.isAssignableFrom(dataClass)) {
    throw new IllegalArgumentException(
        "cannot specify field mask for a Map or Collection class: " + dataClass);
  }
  ClassInfo classInfo = ClassInfo.of(dataClass);
  for (String name : new TreeSet<String>(classInfo.getNames())) {
    FieldInfo fieldInfo = classInfo.getFieldInfo(name);
    if (fieldInfo.isFinal()) {
      continue;
    }
    if (++numFields[0] != 1) {
      fieldsBuf.append(',');
    }
    fieldsBuf.append(name);
    // TODO(yanivi): handle Java arrays?
    Class<?> fieldClass = fieldInfo.getType();
    if (Collection.class.isAssignableFrom(fieldClass)) {
      // TODO(yanivi): handle Java collection of Java collection or Java map?
      fieldClass = (Class<?>) Types.getIterableParameter(fieldInfo.getField().getGenericType());
    }
    // TODO(yanivi): implement support for map when server implements support for *:*
    if (fieldClass != null) {
      if (fieldInfo.isPrimitive()) {
        if (name.charAt(0) != '@' && !name.equals("text()")) {
          // TODO(yanivi): wait for bug fix from server to support text() -- already fixed???
          // buf.append("/text()");
        }
      } else if (!Collection.class.isAssignableFrom(fieldClass)
          && !Map.class.isAssignableFrom(fieldClass)) {
        int[] subNumFields = new int[1];
        int openParenIndex = fieldsBuf.length();
        fieldsBuf.append('(');
        // TODO(yanivi): abort if found cycle to avoid infinite loop
        appendFieldsFor(fieldsBuf, fieldClass, subNumFields);
        updateFieldsBasedOnNumFields(fieldsBuf, openParenIndex, subNumFields[0]);
      }
    }
  }
}