Package com.esotericsoftware.yamlbeans.parser

Examples of com.esotericsoftware.yamlbeans.parser.Event

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   * @param type The type of object to read. If null, behaves the same as {{@link #read()}.
   */
  public <T> T read (Class<T> type, Class elementType) throws YamlException {
    try {
      while (true) {
        Event event = parser.getNextEvent();
        if (event == null) return null;
        if (event.type == STREAM_END) return null;
        if (event.type == DOCUMENT_START) break;
      }
      return (T)readValue(type, elementType, null);
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   * Reads an object from the YAML. Can be overidden to take some action for any of the objects returned.
   */
  protected Object readValue (Class type, Class elementType, Class defaultType) throws YamlException, ParserException,
    TokenizerException {
    String tag = null, anchor = null;
    Event event = parser.peekNextEvent();

    switch (event.type) {
    case ALIAS:
      parser.getNextEvent();
      anchor = ((AliasEvent)event).anchor;
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  }

  private Object readValueInternal (Class type, Class elementType, String anchor) throws YamlException, ParserException,
    TokenizerException {
    if (type == null || type == Object.class) {
      Event event = parser.peekNextEvent();
      switch (event.type) {
      case MAPPING_START:
        type = HashMap.class;
        break;
      case SCALAR:
        type = String.class;
        break;
      case SEQUENCE_START:
        type = ArrayList.class;
        break;
      default:
        throw new YamlReaderException("Expected scalar, sequence, or mapping but found: " + event.type);
      }
    }

    if (type == String.class) {
      Event event = parser.getNextEvent();
      if (event.type != SCALAR) throw new YamlReaderException("Expected scalar for String type but found: " + event.type);
      String value = ((ScalarEvent)event).value;
      if (anchor != null) anchors.put(anchor, value);
      return value;
    }

    if (Beans.isScalar(type)) {
      Event event = parser.getNextEvent();
      if (event.type != SCALAR)
        throw new YamlReaderException("Expected scalar for primitive type '" + type.getClass() + "' but found: " + event.type);
      String value = ((ScalarEvent)event).value;
      try {
        Object convertedValue;
        if (type == String.class) {
          convertedValue = value;
        } else if (type == Integer.TYPE) {
          convertedValue = Integer.valueOf(value);
        } else if (type == Integer.class) {
          convertedValue = value.length() == 0 ? null : Integer.valueOf(value);
        } else if (type == Boolean.TYPE) {
          convertedValue = Boolean.valueOf(value);
        } else if (type == Boolean.class) {
          convertedValue = value.length() == 0 ? null : Boolean.valueOf(value);
        } else if (type == Float.TYPE) {
          convertedValue = Float.valueOf(value);
        } else if (type == Float.class) {
          convertedValue = value.length() == 0 ? null : Float.valueOf(value);
        } else if (type == Double.TYPE) {
          convertedValue = Double.valueOf(value);
        } else if (type == Double.class) {
          convertedValue = value.length() == 0 ? null : Double.valueOf(value);
        } else if (type == Long.TYPE) {
          convertedValue = Long.valueOf(value);
        } else if (type == Long.class) {
          convertedValue = value.length() == 0 ? null : Long.valueOf(value);
        } else if (type == Short.TYPE) {
          convertedValue = Short.valueOf(value);
        } else if (type == Short.class) {
          convertedValue = value.length() == 0 ? null : Short.valueOf(value);
        } else if (type == Character.TYPE) {
          convertedValue = value.charAt(0);
        } else if (type == Character.class) {
          convertedValue = value.length() == 0 ? null : value.charAt(0);
        } else if (type == Byte.TYPE) {
          convertedValue = Byte.valueOf(value);
        } else if (type == Byte.class) {
          convertedValue = value.length() == 0 ? null : Byte.valueOf(value);
        } else
          throw new YamlException("Unknown field type.");
        if (anchor != null) anchors.put(anchor, convertedValue);
        return convertedValue;
      } catch (Exception ex) {
        throw new YamlReaderException("Unable to convert value to required type \"" + type + "\": " + value, ex);
      }
    }

    if (Enum.class.isAssignableFrom(type)) {
      Event event = parser.getNextEvent();
      if (event.type != SCALAR) throw new YamlReaderException("Expected scalar for enum type but found: " + event.type);
      String enumValueName = ((ScalarEvent)event).value;
      if (enumValueName.length() == 0) return null;
      try {
        return Enum.valueOf(type, enumValueName);
      } catch (Exception ex) {
        throw new YamlReaderException("Unable to find enum value '" + enumValueName + "' for enum class: " + type.getName());
      }
    }

    for (Entry<Class, ScalarSerializer> entry : config.scalarSerializers.entrySet()) {
      if (entry.getKey().isAssignableFrom(type)) {
        ScalarSerializer serializer = entry.getValue();
        Event event = parser.getNextEvent();
        if (event.type != SCALAR)
          throw new YamlReaderException("Expected scalar for type '" + type + "' to be deserialized by scalar serializer '"
            + serializer.getClass().getName() + "' but found: " + event.type);
        Object value = serializer.read(((ScalarEvent)event).value);
        if (anchor != null) anchors.put(anchor, value);
        return value;
      }
    }

    Event event = parser.peekNextEvent();
    switch (event.type) {
    case MAPPING_START: {
      // Must be a map or an object.
      event = parser.getNextEvent();
      Object object;
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  private boolean needEvents (int count) {
    int level = 0;
    Iterator<Event> iter = events.iterator();
    iter.next();
    while (iter.hasNext()) {
      Event curr = iter.next();
      if (curr.type == DOCUMENT_START || curr.type == MAPPING_START || curr.type == SEQUENCE_START)
        level++;
      else if (curr.type == DOCUMENT_END || curr.type == MAPPING_END || curr.type == SEQUENCE_END)
        level--;
      else if (curr.type == STREAM_END) level = -1;
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    return event.type == MAPPING_START && !events.isEmpty() && events.get(0).type == MAPPING_END;
  }

  private boolean checkEmptyDocument () {
    if (event.type != DOCUMENT_START || events.isEmpty()) return false;
    Event ev = events.get(0);
    return ev.type == SCALAR && ((ScalarEvent)ev).anchor == null && ((ScalarEvent)ev).tag == null
      && ((ScalarEvent)ev).implicit != null && ((ScalarEvent)ev).value.equals("");
  }
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  public static void main (String[] args) throws IOException {
    Parser parser = new Parser(new FileReader("test/test.yml"));
    Emitter emitter = new Emitter(new OutputStreamWriter(System.out));
    while (true) {
      Event event = parser.getNextEvent();
      if (event == null) break;
      emitter.emit(event);
    }
  }
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  /** Reads an array, Map, List, or Collection object of the specified type from YAML, using the specified element type.
   * @param type The type of object to read. If null, behaves the same as {{@link #read()}. */
  public <T> T read (Class<T> type, Class elementType) throws YamlException {
    try {
      while (true) {
        Event event = parser.getNextEvent();
        if (event == null) return null;
        if (event.type == STREAM_END) return null;
        if (event.type == DOCUMENT_START) break;
      }
      return (T)readValue(type, elementType, null);
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  /** Reads an object from the YAML. Can be overidden to take some action for any of the objects returned. */
  protected Object readValue (Class type, Class elementType, Class defaultType) throws YamlException, ParserException,
    TokenizerException {
    String tag = null, anchor = null;
    Event event = parser.peekNextEvent();

    switch (event.type) {
    case ALIAS:
      parser.getNextEvent();
      anchor = ((AliasEvent)event).anchor;
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  }

  private Object readValueInternal (Class type, Class elementType, String anchor) throws YamlException, ParserException,
    TokenizerException {
    if (type == null || type == Object.class) {
      Event event = parser.peekNextEvent();
      switch (event.type) {
      case MAPPING_START:
        type = HashMap.class;
        break;
      case SCALAR:
        type = String.class;
        break;
      case SEQUENCE_START:
        type = ArrayList.class;
        break;
      default:
        throw new YamlReaderException("Expected scalar, sequence, or mapping but found: " + event.type);
      }
    }

    if (type == String.class) {
      Event event = parser.getNextEvent();
      if (event.type != SCALAR) throw new YamlReaderException("Expected scalar for String type but found: " + event.type);
      String value = ((ScalarEvent)event).value;
      if (anchor != null) anchors.put(anchor, value);
      return value;
    }

    if (Beans.isScalar(type)) {
      Event event = parser.getNextEvent();
      if (event.type != SCALAR)
        throw new YamlReaderException("Expected scalar for primitive type '" + type.getClass() + "' but found: " + event.type);
      String value = ((ScalarEvent)event).value;
      try {
        Object convertedValue;
        if (type == String.class) {
          convertedValue = value;
        } else if (type == Integer.TYPE) {
          convertedValue = value.length() == 0 ? 0 : Integer.decode(value);
        } else if (type == Integer.class) {
          convertedValue = value.length() == 0 ? null : Integer.decode(value);
        } else if (type == Boolean.TYPE) {
          convertedValue = value.length() == 0 ? false : Boolean.valueOf(value);
        } else if (type == Boolean.class) {
          convertedValue = value.length() == 0 ? null : Boolean.valueOf(value);
        } else if (type == Float.TYPE) {
          convertedValue = value.length() == 0 ? 0 : Float.valueOf(value);
        } else if (type == Float.class) {
          convertedValue = value.length() == 0 ? null : Float.valueOf(value);
        } else if (type == Double.TYPE) {
          convertedValue = value.length() == 0 ? 0 : Double.valueOf(value);
        } else if (type == Double.class) {
          convertedValue = value.length() == 0 ? null : Double.valueOf(value);
        } else if (type == Long.TYPE) {
          convertedValue = value.length() == 0 ? 0 : Long.decode(value);
        } else if (type == Long.class) {
          convertedValue = value.length() == 0 ? null : Long.decode(value);
        } else if (type == Short.TYPE) {
          convertedValue = value.length() == 0 ? 0 : Short.decode(value);
        } else if (type == Short.class) {
          convertedValue = value.length() == 0 ? null : Short.decode(value);
        } else if (type == Character.TYPE) {
          convertedValue = value.length() == 0 ? 0 : value.charAt(0);
        } else if (type == Character.class) {
          convertedValue = value.length() == 0 ? null : value.charAt(0);
        } else if (type == Byte.TYPE) {
          convertedValue = value.length() == 0 ? 0 : Byte.decode(value);
        } else if (type == Byte.class) {
          convertedValue = value.length() == 0 ? null : Byte.decode(value);
        } else
          throw new YamlException("Unknown field type.");
        if (anchor != null) anchors.put(anchor, convertedValue);
        return convertedValue;
      } catch (Exception ex) {
        throw new YamlReaderException("Unable to convert value to required type \"" + type + "\": " + value, ex);
      }
    }

    if (Enum.class.isAssignableFrom(type)) {
      Event event = parser.getNextEvent();
      if (event.type != SCALAR) throw new YamlReaderException("Expected scalar for enum type but found: " + event.type);
      String enumValueName = ((ScalarEvent)event).value;
      if (enumValueName.length() == 0) return null;
      try {
        return Enum.valueOf(type, enumValueName);
      } catch (Exception ex) {
        throw new YamlReaderException("Unable to find enum value '" + enumValueName + "' for enum class: " + type.getName());
      }
    }

    for (Entry<Class, ScalarSerializer> entry : config.scalarSerializers.entrySet()) {
      if (entry.getKey().isAssignableFrom(type)) {
        ScalarSerializer serializer = entry.getValue();
        Event event = parser.getNextEvent();
        if (event.type != SCALAR)
          throw new YamlReaderException("Expected scalar for type '" + type + "' to be deserialized by scalar serializer '"
            + serializer.getClass().getName() + "' but found: " + event.type);
        Object value = serializer.read(((ScalarEvent)event).value);
        if (anchor != null) anchors.put(anchor, value);
        return value;
      }
    }

    Event event = parser.peekNextEvent();
    switch (event.type) {
    case MAPPING_START: {
      // Must be a map or an object.
      event = parser.getNextEvent();
      Object object;
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  private boolean needEvents (int count) {
    int level = 0;
    Iterator<Event> iter = events.iterator();
    iter.next();
    while (iter.hasNext()) {
      Event curr = iter.next();
      if (curr.type == DOCUMENT_START || curr.type == MAPPING_START || curr.type == SEQUENCE_START)
        level++;
      else if (curr.type == DOCUMENT_END || curr.type == MAPPING_END || curr.type == SEQUENCE_END)
        level--;
      else if (curr.type == STREAM_END) level = -1;
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Related Classes of com.esotericsoftware.yamlbeans.parser.Event

  • com.esotericsoftware.yamlbeans.emitter.Emitter
  • com.esotericsoftware.yamlbeans.YamlReader
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