Example usage for com.google.gson.stream JsonReader nextName

List of usage examples for com.google.gson.stream JsonReader nextName

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Introduction

In this page you can find the example usage for com.google.gson.stream JsonReader nextName.

Prototype

public String nextName() throws IOException

Source Link

Document

Returns the next token, a com.google.gson.stream.JsonToken#NAME property name , and consumes it.

Usage

From source file:com.getperka.flatpack.Unpacker.java

License:Apache License

private <T> FlatPackEntity<T> unpack(Type returnType, JsonReader reader, Principal principal)
        throws IOException {
    // Hold temporary state for deserialization
    DeserializationContext context = contexts.get();

    /*/* w  w  w .  jav  a 2 s.  c o  m*/
     * Decoding is done as a two-pass operation since the runtime type of an allocated object cannot
     * be swizzled. The per-entity data is held as a semi-reified JsonObject to be passed off to a
     * Codex.
     */
    Map<HasUuid, JsonObject> entityData = FlatPackCollections.mapForIteration();
    // Used to populate the entityData map
    JsonParser jsonParser = new JsonParser();
    /*
     * The reader is placed in lenient mode as an aid to developers, however all output will be
     * strictly formatted.
     */
    reader.setLenient(true);

    // The return value
    @SuppressWarnings("unchecked")
    FlatPackEntity<T> toReturn = (FlatPackEntity<T>) FlatPackEntity.create(returnType, null, principal);
    // Stores the single, top-level value in the payload for two-pass reification
    JsonElement value = null;

    if (reader.peek().equals(JsonToken.NULL)) {
        return toReturn;
    }

    reader.beginObject();

    while (JsonToken.NAME.equals(reader.peek())) {
        String name = reader.nextName();
        if ("data".equals(name)) {
            // data : { "fooEntity" : [ { ... }, { ... } ]
            reader.beginObject();
            while (JsonToken.NAME.equals(reader.peek())) {
                // Turn "fooEntity" into the actual FooEntity class
                String simpleName = reader.nextName();
                Class<? extends HasUuid> clazz = typeContext.getClass(simpleName);
                if (clazz == null) {
                    if (ignoreUnresolvableTypes) {
                        reader.skipValue();
                        continue;
                    } else {
                        throw new UnsupportedOperationException("Cannot resolve type " + simpleName);
                    }
                } else if (Modifier.isAbstract(clazz.getModifiers())) {
                    throw new UnsupportedOperationException(
                            "A subclass of " + simpleName + " must be used instead");
                }
                context.pushPath("allocating " + simpleName);
                try {
                    // Find the Codex for the requested entity type
                    EntityCodex<?> codex = (EntityCodex<?>) typeContext.getCodex(clazz);

                    // Take the n-many property objects and stash them for later decoding
                    reader.beginArray();
                    while (!JsonToken.END_ARRAY.equals(reader.peek())) {
                        JsonObject chunk = jsonParser.parse(reader).getAsJsonObject();
                        HasUuid entity = codex.allocate(chunk, context);
                        toReturn.addExtraEntity(entity);
                        entityData.put(entity, chunk.getAsJsonObject());
                    }
                    reader.endArray();
                } finally {
                    context.popPath();
                }
            }
            reader.endObject();
        } else if ("errors".equals(name)) {
            // "errors" : { "path" : "problem", "path2" : "problem2" }
            reader.beginObject();
            while (JsonToken.NAME.equals(reader.peek())) {
                String path = reader.nextName();
                if (JsonToken.STRING.equals(reader.peek()) || JsonToken.NUMBER.equals(reader.peek())) {
                    toReturn.addError(path, reader.nextString());
                } else {
                    reader.skipValue();
                }
            }
            reader.endObject();
        } else if ("metadata".equals(name)) {
            reader.beginArray();

            while (!JsonToken.END_ARRAY.equals(reader.peek())) {
                EntityMetadata meta = new EntityMetadata();
                JsonObject metaElement = jsonParser.parse(reader).getAsJsonObject();
                metaCodex.get().readProperties(meta, metaElement, context);
                toReturn.addMetadata(meta);
            }

            reader.endArray();
        } else if ("value".equals(name)) {
            // Just stash the value element in case it occurs first
            value = jsonParser.parse(reader);
        } else if (JsonToken.STRING.equals(reader.peek()) || JsonToken.NUMBER.equals(reader.peek())) {
            // Save off any other simple properties
            toReturn.putExtraData(name, reader.nextString());
        } else {
            // Ignore random other entries
            reader.skipValue();
        }
    }

    reader.endObject();
    reader.close();

    for (Map.Entry<HasUuid, JsonObject> entry : entityData.entrySet()) {
        HasUuid entity = entry.getKey();
        EntityCodex<HasUuid> codex = (EntityCodex<HasUuid>) typeContext.getCodex(entity.getClass());
        codex.readProperties(entity, entry.getValue(), context);
    }

    @SuppressWarnings("unchecked")
    Codex<T> returnCodex = (Codex<T>) typeContext.getCodex(toReturn.getType());
    toReturn.withValue(returnCodex.read(value, context));

    for (Map.Entry<UUID, String> entry : context.getWarnings().entrySet()) {
        toReturn.addWarning(entry.getKey().toString(), entry.getValue());
    }

    // Process metadata
    for (EntityMetadata meta : toReturn.getMetadata()) {
        if (meta.isPersistent()) {
            HasUuid entity = context.getEntity(meta.getUuid());
            if (entity instanceof PersistenceAware) {
                ((PersistenceAware) entity).markPersistent();
            }
        }
    }

    context.runPostWork();
    context.close();

    return toReturn;
}

From source file:com.gilecode.yagson.types.TypeUtils.java

License:Apache License

private static Type readTypeAdvice(JsonReader in) throws IOException {
    in.beginObject();/*from   w ww. j  a  va  2s .c om*/
    if (!in.hasNext()) {
        throw new JsonSyntaxException("BEGIN_OBJECT is not expected at path " + in.getPath());
    }
    String name = in.nextName();
    if (!name.equals("@type")) {
        throw new JsonSyntaxException("@type is expected at path " + in.getPath());
    }
    return readTypeAdviceAfterTypeField(in);
}

From source file:com.gilecode.yagson.types.TypeUtils.java

License:Apache License

private static boolean consumeValueField(JsonReader in) throws IOException {
    if (!in.hasNext()) {
        // no @val means actually null value, e.g. skipped by serialization
        return false;
    }/* w  w  w  .  j  a v  a2  s.  c om*/
    String name = in.nextName();
    if (!name.equals("@val")) {
        throw new JsonSyntaxException("Only @type and @val fields are expected at the type advice "
                + "objects at path " + in.getPath());
    }
    return true;
}

From source file:com.github.kevinsawicki.halligan.Resource.java

License:Open Source License

/**
 * Fill this resource by parsing the next object in the reader
 *
 * @param reader//from ww  w .  j ava  2  s  .c  om
 * @return this resource
 * @throws IOException
 */
protected Resource parse(final JsonReader reader) throws IOException {
    reader.beginObject();
    while (reader.hasNext() && reader.peek() == NAME) {
        String name = reader.nextName();
        if ("_links".equals(name))
            parseLinks(reader);
        else if ("_embedded".equals(name))
            parseResources(reader);
        else
            parseProperty(reader, name);
    }
    reader.endObject();
    return this;
}

From source file:com.github.kevinsawicki.halligan.Resource.java

License:Open Source License

/**
 * Parse resources from current value/*from  w  w w. j  av a2  s .  com*/
 *
 * @param reader
 * @throws IOException
 */
protected void parseResources(final JsonReader reader) throws IOException {
    reader.beginObject();
    while (reader.hasNext()) {
        String name = reader.nextName();
        JsonToken next = reader.peek();
        switch (next) {
        case BEGIN_OBJECT:
            resources.put(name, Collections.singletonList(createResource().parse(reader)));
            break;
        case BEGIN_ARRAY:
            reader.beginArray();
            List<Resource> entries = new ArrayList<Resource>();
            while (reader.peek() == BEGIN_OBJECT)
                entries.add(createResource().parse(reader));
            reader.endArray();
            resources.put(name, entries);
            break;
        default:
            throw new IOException(
                    "_embedded object value is a " + next.name() + " and must be an array or object");
        }
    }
    reader.endObject();
}

From source file:com.github.lindenb.gatkui.Json2Xml.java

License:Open Source License

private void parseObject(String label, JsonReader r) throws Exception {

    w.writeStartElement(NS, "object");
    if (label != null)
        w.writeAttribute("name", label);
    for (;;) {//from   w  w  w .j a v  a  2s  .c o m
        if (r.peek() == JsonToken.END_OBJECT)
            break;
        if (r.peek() != JsonToken.NAME)
            throw new IllegalStateException(r.peek().name());
        String s = r.nextName();
        parse(s, r);
    }
    w.writeEndElement();
    r.endObject();
}

From source file:com.google.maps.internal.DateTimeAdapter.java

License:Open Source License

/**
 * Read a Time object from a Directions API result and convert it to a {@link DateTime}.
 *
 * <p>We are expecting to receive something akin to the following:
 * <pre>//from   w  ww. j  a v a 2 s .  c  o m
 * {
 *   "text" : "4:27pm",
 *   "time_zone" : "Australia/Sydney",
 *   "value" : 1406528829
 * }
 * </pre>
 */
@Override
public DateTime read(JsonReader reader) throws IOException {
    if (reader.peek() == JsonToken.NULL) {
        reader.nextNull();
        return null;
    }

    String timeZoneId = "";
    long secondsSinceEpoch = 0L;

    reader.beginObject();
    while (reader.hasNext()) {
        String name = reader.nextName();
        if (name.equals("text")) {
            // Ignore the human readable rendering.
            reader.nextString();
        } else if (name.equals("time_zone")) {
            timeZoneId = reader.nextString();
        } else if (name.equals("value")) {
            secondsSinceEpoch = reader.nextLong();
        }

    }
    reader.endObject();

    return new DateTime(secondsSinceEpoch * 1000, DateTimeZone.forID(timeZoneId));
}

From source file:com.google.maps.internal.DistanceAdapter.java

License:Open Source License

/**
 * Read a distance object from a Directions API result and convert it to a {@link Distance}.
 *
 * <p>We are expecting to receive something akin to the following:
 * <pre>/*from w  ww  . ja  v  a  2  s .c om*/
 * {
 *   "value": 207,
     "text": "0.1 mi"
 * }
 * </pre>
 */
@Override
public Distance read(JsonReader reader) throws IOException {
    if (reader.peek() == JsonToken.NULL) {
        reader.nextNull();
        return null;
    }

    Distance distance = new Distance();

    reader.beginObject();
    while (reader.hasNext()) {
        String name = reader.nextName();
        if (name.equals("text")) {
            distance.humanReadable = reader.nextString();
        } else if (name.equals("value")) {
            distance.inMeters = reader.nextLong();
        }

    }
    reader.endObject();

    return distance;
}

From source file:com.google.maps.internal.DurationAdapter.java

License:Open Source License

/**
 * Read a distance object from a Directions API result and convert it to a {@link Distance}.
 *
 * <p>We are expecting to receive something akin to the following:
 * <pre>/* www  .jav a2  s.  c  o m*/
 * {
 *   "value": 207,
     "text": "0.1 mi"
 * }
 * </pre>
 */
@Override
public Duration read(JsonReader reader) throws IOException {
    if (reader.peek() == JsonToken.NULL) {
        reader.nextNull();
        return null;
    }

    Duration duration = new Duration();

    reader.beginObject();
    while (reader.hasNext()) {
        String name = reader.nextName();
        if (name.equals("text")) {
            duration.humanReadable = reader.nextString();
        } else if (name.equals("value")) {
            duration.inSeconds = reader.nextLong();
        }

    }
    reader.endObject();

    return duration;
}

From source file:com.google.maps.internal.FareAdapter.java

License:Open Source License

/**
 * Read a Fare object from the Directions API and convert to a {@link com.google.maps.model.Fare}
 *
 * <pre>{/*from  www . j  a  v a 2 s.  c om*/
 *   "currency": "USD",
 *   "value": 6
 * }</pre>
 */
@Override
public Fare read(JsonReader reader) throws IOException {
    if (reader.peek() == JsonToken.NULL) {
        reader.nextNull();
        return null;
    }

    Fare fare = new Fare();
    reader.beginObject();
    while (reader.hasNext()) {
        String key = reader.nextName();
        if ("currency".equals(key)) {
            fare.currency = Currency.getInstance(reader.nextString());
        } else if ("value".equals(key)) {
            // this relies on nextString() being able to coerce raw numbers to strings
            fare.value = new BigDecimal(reader.nextString());
        } else {
            // Be forgiving of unexpected values
            reader.skipValue();
        }
    }
    reader.endObject();

    return fare;
}