com.google.gson.stream.JsonToken#STRING源码实例Demo

private List<String> readLinksArray(final JsonReader reader) throws IOException, EntityProviderException {
  List<String> links = new ArrayList<String>();

  reader.beginArray();
  while (reader.hasNext()) {
    reader.beginObject();
    String nextName = reader.nextName();
    if (FormatJson.URI.equals(nextName) && reader.peek() == JsonToken.STRING) {
      links.add(reader.nextString());
    } else {
      throw new EntityProviderException(EntityProviderException.INVALID_CONTENT.addContent(FormatJson.URI).addContent(nextName));
    }
    reader.endObject();
  }
  reader.endArray();

  return links;
}
 

public double nextDouble()
{
    JsonToken jsontoken = peek();
    if (jsontoken != JsonToken.NUMBER && jsontoken != JsonToken.STRING)
    {
        throw new IllegalStateException((new StringBuilder()).append("Expected ").append(JsonToken.NUMBER).append(" but was ").append(jsontoken).toString());
    }
    double d1 = ((JsonPrimitive)a()).getAsDouble();
    if (!isLenient() && (Double.isNaN(d1) || Double.isInfinite(d1)))
    {
        throw new NumberFormatException((new StringBuilder()).append("JSON forbids NaN and infinities: ").append(d1).toString());
    } else
    {
        b();
        return d1;
    }
}
 

/**
 * 
 * @param reader
 * @param feedMetadata
 * @throws IOException
 * @throws EntityProviderException
 */
protected static void readInlineCount(final JsonReader reader, final FeedMetadataImpl feedMetadata)
    throws IOException, EntityProviderException {
  if (reader.peek() == JsonToken.STRING && feedMetadata.getInlineCount() == null) {
    int inlineCount;
    try {
      inlineCount = reader.nextInt();
    } catch (final NumberFormatException e) {
      throw new EntityProviderException(EntityProviderException.INLINECOUNT_INVALID.addContent(""), e);
    }
    if (inlineCount >= 0) {
      feedMetadata.setInlineCount(inlineCount);
    } else {
      throw new EntityProviderException(EntityProviderException.INLINECOUNT_INVALID.addContent(inlineCount));
    }
  } else {
    throw new EntityProviderException(EntityProviderException.INLINECOUNT_INVALID.addContent(reader.peek()));
  }
}
 

private JsonLdContext readContextDef(JsonReader reader) throws IOException {
  reader.beginObject();
  JsonLdContext.Builder contextBuilder = JsonLdFactory.newContextBuilder();
  while (reader.hasNext()) {
    String key = reader.nextName();
    if (!JsonLdConstants.BASE.equals(key)) {
      throw new JsonLdSyntaxException(
          String.format("Unsupported '%s' in JSON-LD context", key));
    }
    JsonToken valueToken = reader.peek();
    if (valueToken == JsonToken.STRING) {
      contextBuilder.setBase(reader.nextString());
    } else if (valueToken == JsonToken.NULL) {
      reader.nextNull();
      contextBuilder.setBase(null);
    } else {
      throw new JsonLdSyntaxException(
          String.format("The value of @base is '%s', should be a string", valueToken));
    }
  }
  reader.endObject();
  return contextBuilder.build();
}
 

@Override public double nextDouble() throws IOException {
  JsonToken token = peek();
  if (token != JsonToken.NUMBER && token != JsonToken.STRING) {
    throw new IllegalStateException(
        "Expected " + JsonToken.NUMBER + " but was " + token + locationString());
  }
  double result = ((JsonPrimitive) peekStack()).getAsDouble();
  if (!isLenient() && (Double.isNaN(result) || Double.isInfinite(result))) {
    throw new NumberFormatException("JSON forbids NaN and infinities: " + result);
  }
  popStack();
  if (stackSize > 0) {
    pathIndices[stackSize - 1]++;
  }
  return result;
}
 

@Override
public MarkTiming read(JsonReader in) throws IOException {
  if (in.peek() == JsonToken.NULL) {
    in.nextNull();
    return null;
  }

  final MarkTiming markTiming = new MarkTiming();
  in.beginArray();

  if (in.peek() == JsonToken.STRING) {
    markTiming.setMark(in.nextString());
  }
  if (in.peek() == JsonToken.NUMBER) {
    markTiming.setTime(in.nextDouble());
  }

  in.endArray();
  return markTiming;
}
 

/**
 * Returns the type of the next token without consuming it.
 */
public JsonToken peek() throws IOException {
   int p = peeked;
   if (p == PEEKED_NONE) {
      p = doPeek();
   }

   switch (p) {
      case PEEKED_BEGIN_OBJECT:
         return JsonToken.BEGIN_OBJECT;
      case PEEKED_END_OBJECT:
         return JsonToken.END_OBJECT;
      case PEEKED_BEGIN_ARRAY:
         return JsonToken.BEGIN_ARRAY;
      case PEEKED_END_ARRAY:
         return JsonToken.END_ARRAY;
      case PEEKED_SINGLE_QUOTED_NAME:
      case PEEKED_DOUBLE_QUOTED_NAME:
      case PEEKED_UNQUOTED_NAME:
         return JsonToken.NAME;
      case PEEKED_TRUE:
      case PEEKED_FALSE:
         return JsonToken.BOOLEAN;
      case PEEKED_NULL:
         return JsonToken.NULL;
      case PEEKED_SINGLE_QUOTED:
      case PEEKED_DOUBLE_QUOTED:
      case PEEKED_UNQUOTED:
      case PEEKED_BUFFERED:
         return JsonToken.STRING;
      case PEEKED_LONG:
      case PEEKED_NUMBER:
         return JsonToken.NUMBER;
      case PEEKED_EOF:
         return JsonToken.END_DOCUMENT;
      default:
         throw new AssertionError();
   }
}
 

public String nextString()
{
    JsonToken jsontoken = peek();
    if (jsontoken != JsonToken.STRING && jsontoken != JsonToken.NUMBER)
    {
        throw new IllegalStateException((new StringBuilder()).append("Expected ").append(JsonToken.STRING).append(" but was ").append(jsontoken).toString());
    } else
    {
        return ((JsonPrimitive)b()).getAsString();
    }
}
 

/**
 * 
 * @param reader
 * @param errorContext
 * @throws IOException
 */
private void parseInnerError(final JsonReader reader, final ODataErrorContext errorContext) throws IOException {
  JsonToken token = reader.peek();
  if (token == JsonToken.STRING) {
    // implementation for parse content as provided by JsonErrorDocumentProducer
    String innerError = reader.nextString();
    errorContext.setInnerError(innerError);
  } else if (token == JsonToken.BEGIN_OBJECT) {
    // implementation for OData v2 Section 2.2.8.1.2 JSON Error Response
    // (RFC4627 Section 2.2 -> https://www.ietf.org/rfc/rfc4627.txt))
    // currently partial provided
    errorContext.setInnerError(readJson(reader));
  }
}
 

public long nextLong() throws IOException {
    JsonToken token = peek();
    if (token == JsonToken.NUMBER || token == JsonToken.STRING) {
        long result = ((JsonPrimitive) peekStack()).getAsLong();
        popStack();
        return result;
    }
    throw new IllegalStateException("Expected " + JsonToken.NUMBER + " but was " + token);
}
 

@Override public long nextLong() throws IOException {
  JsonToken token = peek();
  if (token != JsonToken.NUMBER && token != JsonToken.STRING) {
    throw new IllegalStateException(
        "Expected " + JsonToken.NUMBER + " but was " + token + locationString());
  }
  long result = ((JsonPrimitive) peekStack()).getAsLong();
  popStack();
  if (stackSize > 0) {
    pathIndices[stackSize - 1]++;
  }
  return result;
}
 

@Override public int nextInt() throws IOException {
  JsonToken token = peek();
  if (token != JsonToken.NUMBER && token != JsonToken.STRING) {
    throw new IllegalStateException(
        "Expected " + JsonToken.NUMBER + " but was " + token + locationString());
  }
  int result = ((JsonPrimitive) peekStack()).getAsInt();
  popStack();
  if (stackSize > 0) {
    pathIndices[stackSize - 1]++;
  }
  return result;
}
 

private static JsonToken toGsonToken(com.fasterxml.jackson.core.JsonToken token) {
  switch (token) {
  case START_ARRAY:
    return JsonToken.BEGIN_ARRAY;
  case END_ARRAY:
    return JsonToken.END_ARRAY;
  case START_OBJECT:
    return JsonToken.BEGIN_OBJECT;
  case END_OBJECT:
    return JsonToken.END_OBJECT;
  case FIELD_NAME:
    return JsonToken.NAME;
  case VALUE_FALSE:
    return JsonToken.BOOLEAN;
  case VALUE_TRUE:
    return JsonToken.BOOLEAN;
  case VALUE_NULL:
    return JsonToken.NULL;
  case VALUE_NUMBER_INT:
    return JsonToken.NUMBER;
  case VALUE_NUMBER_FLOAT:
    return JsonToken.NUMBER;
  case VALUE_STRING:
  case VALUE_EMBEDDED_OBJECT:
    return JsonToken.STRING;
  default: // Not semantically equivalent
    return JsonToken.NULL;
  }
}
 

@Override
public Boolean read(JsonReader in) throws IOException {
  JsonToken peek = in.peek();
  if (peek == JsonToken.NULL) {
    in.nextNull();
    return null;
  } else if (peek == JsonToken.STRING) {
    // support strings for compatibility with GSON 1.7
    return Boolean.parseBoolean(in.nextString());
  }
  return in.nextBoolean();
}
 

private void handleName(final String nextName) throws IOException, EdmException, EntityProviderException {
  if (FormatJson.RESULTS.equals(nextName)) {
    resultsArrayPresent = true;
    readArrayContent();

  } else if (FormatJson.COUNT.equals(nextName)) {
    readInlineCount(reader, feedMetadata);

  } else if (FormatJson.NEXT.equals(nextName)) {
    if (reader.peek() == JsonToken.STRING && feedMetadata.getNextLink() == null) {
      String nextLink = reader.nextString();
      feedMetadata.setNextLink(nextLink);
    } else {
      throw new EntityProviderException(EntityProviderException.INVALID_CONTENT.addContent(nextName).addContent(
          "JsonFeed"));
    }

  } else if (FormatJson.DELTA.equals(nextName)) {
    if (reader.peek() == JsonToken.STRING && feedMetadata.getDeltaLink() == null) {
      String deltaLink = reader.nextString();
      feedMetadata.setDeltaLink(deltaLink);
    } else {
      throw new EntityProviderException(EntityProviderException.INVALID_CONTENT.addContent(nextName).addContent(
          "JsonFeed"));
    }
  } else {
    throw new EntityProviderException(EntityProviderException.INVALID_CONTENT.addContent(nextName).addContent(
        "JsonFeed"));
  }
}
 

@Override public double nextDouble() throws IOException {
  JsonToken token = peek();
  if (token != JsonToken.NUMBER && token != JsonToken.STRING) {
    throw new IllegalStateException("Expected " + JsonToken.NUMBER + " but was " + token);
  }
  double result = ((JsonPrimitive) peekStack()).getAsDouble();
  if (!isLenient() && (Double.isNaN(result) || Double.isInfinite(result))) {
    throw new NumberFormatException("JSON forbids NaN and infinities: " + result);
  }
  popStack();
  return result;
}
 

private Map<String, String> readAspects ( final JsonReader jr ) throws IOException
{
    final Map<String, String> result = new HashMap<> ();

    jr.beginObject ();
    while ( jr.hasNext () )
    {
        switch ( jr.nextName () )
        {
            case "map":
                jr.beginObject ();
                while ( jr.hasNext () )
                {
                    final String id = jr.nextName ();
                    String value = null;
                    if ( jr.peek () == JsonToken.STRING )
                    {
                        value = jr.nextString ();
                    }
                    else
                    {
                        jr.skipValue ();
                    }
                    result.put ( id, value );
                }
                jr.endObject ();
                break;
        }
    }
    jr.endObject ();

    return result;
}
 

@Override public String nextString() throws IOException {
  JsonToken token = peek();
  if (token != JsonToken.STRING && token != JsonToken.NUMBER) {
    throw new IllegalStateException("Expected " + JsonToken.STRING + " but was " + token);
  }
  return ((JsonPrimitive) popStack()).getAsString();
}
 

public JsonToken peek() throws IOException {
    if (this.stack.isEmpty()) {
        return JsonToken.END_DOCUMENT;
    }
    Iterator<?> o = peekStack();
    if (o instanceof Iterator) {
        boolean isObject = this.stack.get(this.stack.size() - 2) instanceof JsonObject;
        Iterator<?> iterator = o;
        if (!iterator.hasNext()) {
            return isObject ? JsonToken.END_OBJECT : JsonToken.END_ARRAY;
        } else {
            if (isObject) {
                return JsonToken.NAME;
            }
            this.stack.add(iterator.next());
            return peek();
        }
    } else if (o instanceof JsonObject) {
        return JsonToken.BEGIN_OBJECT;
    } else {
        if (o instanceof JsonArray) {
            return JsonToken.BEGIN_ARRAY;
        }
        if (o instanceof JsonPrimitive) {
            JsonPrimitive primitive = (JsonPrimitive) o;
            if (primitive.isString()) {
                return JsonToken.STRING;
            }
            if (primitive.isBoolean()) {
                return JsonToken.BOOLEAN;
            }
            if (primitive.isNumber()) {
                return JsonToken.NUMBER;
            }
            throw new AssertionError();
        } else if (o instanceof JsonNull) {
            return JsonToken.NULL;
        } else {
            if (o == SENTINEL_CLOSED) {
                throw new IllegalStateException("JsonReader is closed");
            }
            throw new AssertionError();
        }
    }
}
 

private Object readSimpleProperty(final JsonReader reader, final EntityPropertyInfo entityPropertyInfo,
    final Object typeMapping, final DeserializerProperties readProperties)
    throws EdmException, EntityProviderException, IOException {
  final EdmSimpleType type = (EdmSimpleType) entityPropertyInfo.getType();
  Object value = null;
  final JsonToken tokenType = reader.peek();
  if (tokenType == JsonToken.NULL) {
    reader.nextNull();
  } else {
    switch (EdmSimpleTypeKind.valueOf(type.getName())) {
    case Boolean:
      if (tokenType == JsonToken.BOOLEAN) {
        value = reader.nextBoolean();
        value = value.toString();
      } else {
        throw new EntityProviderException(EntityProviderException.INVALID_PROPERTY_VALUE
            .addContent(entityPropertyInfo.getName()));
      }
      break;
    case Byte:
    case SByte:
    case Int16:
    case Int32:
      if (tokenType == JsonToken.NUMBER) {
        value = reader.nextInt();
        value = value.toString();
      } else {
        throw new EntityProviderException(EntityProviderException.INVALID_PROPERTY_VALUE
            .addContent(entityPropertyInfo.getName()));
      }
      break;
    case Single:
    case Double:
      if (tokenType == JsonToken.STRING) {
        value = reader.nextString();
      } else if (tokenType == JsonToken.NUMBER) {
        value = reader.nextDouble();
        value = value.toString();
      } else {
        throw new EntityProviderException(EntityProviderException.INVALID_PROPERTY_VALUE
            .addContent(entityPropertyInfo.getName()));
      }
      break;
    default:
      if (tokenType == JsonToken.STRING) {
        value = reader.nextString();
      } else {
        throw new EntityProviderException(EntityProviderException.INVALID_PROPERTY_VALUE
            .addContent(entityPropertyInfo.getName()));
      }
      break;
    }
  }

  final Class<?> typeMappingClass = typeMapping == null ? type.getDefaultType() : (Class<?>) typeMapping;
  final EdmFacets facets = readProperties == null || readProperties.isValidatingFacets() ?
      entityPropertyInfo.getFacets() : null;
  return type.valueOfString((String) value, EdmLiteralKind.JSON, facets, typeMappingClass);
}