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

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

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Introduction

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

Prototype

public JsonToken peek() throws IOException

Source Link

Document

Returns the type of the next token without consuming it.

Usage

From source file:com.gilecode.yagson.adapters.DefaultTypeAdapterRuntimeWrapper.java

License:Apache License

@Override
public T read(JsonReader in, ReadContext ctx) throws IOException {

    // Although similar check exists in ReadContext.doRead(), we need to duplicate it here, as wrappers hide
    //   simple delegate adapters

    if (in.peek() == JsonToken.BEGIN_OBJECT && AdapterUtils.isSimpleTypeAdapter(defaultTypeAdapter)) {
        // if default adapter is simple and '{' is found, we expect and parse type advice here, and fail otherwise
        return TypeUtils.readTypeAdvisedValue(gson, in, formalType, ctx);

    } else {/*from w w  w . ja v a 2 s.c  o m*/
        // no type advice, or defaultTypeAdapter is able to process type advice itself, as it is non-Simple
        return defaultTypeAdapter.read(in, ctx);
    }
}

From source file:com.gilecode.yagson.adapters.TypeAdviceReadingSimpleAdapterWrapper.java

License:Apache License

@Override
public T read(JsonReader in, ReadContext ctx) throws IOException {

    if (in.peek() == JsonToken.BEGIN_OBJECT) {
        // if '{' is found for the simple type, we expect and parse type advice here, and fail otherwise
        return TypeUtils.readTypeAdvisedValue(gson, in, null, ctx);

    } else {/*from  w w  w.  j  a v  a  2  s  .c om*/
        // no type advice, use delegate
        return delegateTypeAdapter.read(in, ctx);
    }
}

From source file:com.gilecode.yagson.adapters.TypeAdvisableComplexTypeAdapter.java

License:Apache License

public T read(JsonReader in, ReadContext ctx) throws IOException {
    JsonToken nextToken = in.peek();

    if (nextToken == JsonToken.NULL) {
        in.nextNull();/* w  w w.j  av a2  s  .  c o m*/
        return null;
    } else if (nextToken == JsonToken.STRING) {
        // for complex type adapters, each string is a reference, no isReferenceString() match required
        String reference = in.nextString();
        T referenced = ctx.refsContext().getReferencedObject(reference);
        return referenced;
    }

    return readOptionallyAdvisedInstance(in, ctx);
}

From source file:com.gilecode.yagson.ReadContext.java

License:Apache License

public <T> T doRead(JsonReader reader, TypeAdapter<T> typeAdapter, String pathElement) throws IOException {

    // PROBLEM: as JsonReader does not support lookaheads for more than one token, we cannot
    //    distinguish regular objects like "{field:value}" from type-advised primitives like
    //    "{@type:Long, @val:1}" here.
    ///*from w  w w.  j av a2s.co m*/
    // SOLUTION: all non-Simple TypeAdapters shall handle type advices themselves, so we delegate to them.
    //     For simple delegates, if '{' found, we expect and parse type advice here, and fail otherwise

    if (AdapterUtils.isSimpleTypeAdapter(typeAdapter) && reader.peek() == JsonToken.BEGIN_OBJECT
            && gson.getTypeInfoPolicy().isEnabled()) {
        // simple type adapters do not use '{', so this is definitely a type advice. Use a wrapper adapter
        // to correctly process it
        typeAdapter = new TypeAdviceReadingSimpleAdapterWrapper<T>(gson, typeAdapter);
    }

    return rctx.doRead(reader, typeAdapter, pathElement, this);
}

From source file:com.github.filosganga.geogson.gson.PositionsAdapter.java

License:Apache License

@Override
public Positions read(JsonReader in) throws IOException {

    Positions parsed;//from ww w. j  ava  2 s . c o  m

    JsonToken peek = in.peek();
    if (peek == JsonToken.NULL) {
        in.nextNull();
        parsed = null;
    } else if (peek == JsonToken.BEGIN_ARRAY) {
        parsed = parsePositions(in);
    } else {
        throw new IllegalArgumentException("The json must be an array or null: " + in.peek());
    }

    return parsed;
}

From source file:com.github.filosganga.geogson.gson.PositionsAdapter.java

License:Apache License

private Positions parsePositions(JsonReader in) throws IOException {

    Optional<Positions> parsed = Optional.absent();

    if (in.peek() != JsonToken.BEGIN_ARRAY) {
        throw new IllegalArgumentException("The given json is not a valid positions");
    }//  www  .j  av  a2 s  .com

    in.beginArray();
    if (in.peek() == JsonToken.NUMBER) {
        parsed = Optional.of(parseSinglePosition(in));
    } else if (in.peek() == JsonToken.BEGIN_ARRAY) {
        while (in.hasNext()) {
            Positions thisPositions = parsePositions(in);
            // fix bug #30: according to the recursion (i.e. the array structure;
            // recognize that we came from a recursion because no parsed has no
            // value yet): convert the already parsed Positions to the
            // LinearPositions/AreaPositions matching the recursion level
            if (parsed.equals(Optional.absent()) && thisPositions instanceof LinearPositions) {
                AreaPositions areaPositions = new AreaPositions(
                        ImmutableList.of((LinearPositions) thisPositions));
                parsed = Optional.of((Positions) areaPositions);
            } else if (parsed.equals(Optional.absent()) && thisPositions instanceof AreaPositions) {
                MultiDimensionalPositions multiPositions = new MultiDimensionalPositions(
                        ImmutableList.of((AreaPositions) thisPositions));
                parsed = Optional.of((Positions) multiPositions);
            } else {
                // mergeFn() does all the rest, if parsed has a value
                parsed = parsed.transform(mergeFn(thisPositions)).or(Optional.of(thisPositions));
            }

        }
    }

    in.endArray();

    return parsed.orNull();
}

From source file:com.github.filosganga.geogson.gson.PositionsAdapter.java

License:Apache License

private Positions parseSinglePosition(JsonReader in) throws IOException {
    Positions parsed;/*from   w  w w  .  j a v a 2 s  . c o  m*/
    double lon = in.nextDouble();
    double lat = in.nextDouble();
    double alt = 0.0;

    if (in.hasNext()) {
        alt = in.nextDouble();
    }

    // Skip eventual altitude or other dimensions
    while (in.peek() != JsonToken.END_ARRAY) {
        in.skipValue();
    }

    parsed = new SinglePosition(Coordinates.of(lon, lat, alt));
    return parsed;
}

From source file:com.github.gv2011.jsong.JsongAdapter.java

License:Open Source License

private JsonNode deserialize(final JsonFactoryImp jf, final JsonReader in) {
    return call(() -> {
        switch (in.peek()) {
        case STRING:
            return jf.primitive(in.nextString());
        case NUMBER:
            return jf.primitive(new BigDecimal(in.nextString()));
        case BOOLEAN:
            return jf.primitive(in.nextBoolean());
        case NULL:
            in.nextNull();// w ww.  j  av a  2 s  .c  o  m
            return jf.jsonNull();
        case BEGIN_ARRAY:
            in.beginArray();
            final JsonList list = XStream.fromIterator(new It(jf, in)).collect(jf.toJsonList());
            in.endArray();
            return list;
        case BEGIN_OBJECT:
            in.beginObject();
            final JsonObject obj = XStream.fromIterator(new Itm(jf, in)).collect(jf.toJsonObject());
            in.endObject();
            return obj;
        case NAME:
        case END_DOCUMENT:
        case END_OBJECT:
        case END_ARRAY:
        default:
            throw new IllegalArgumentException();
        }
    });
}

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   w w w  .j  a  v a  2 s .  c o m*/
 * @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//ww w  . j  a  v a 2 s . c om
 *
 * @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();
}