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:co.cask.cdap.internal.io.SchemaTypeAdapter.java

License:Apache License

/**
 * Constructs a {@link Schema} from the "key":"schema" pair.
 *
 * @param reader The {@link JsonReader} for streaming json input tokens.
 * @param key The json property name that need to match.
 * @param knownRecords Set of record name already encountered during the reading.
 * @return A {@link Schema} object representing the schema of the json input.
 * @throws IOException When fails to construct a valid schema from the input.
 *//* www.  ja  v  a  2 s.co  m*/
private Schema readInnerSchema(JsonReader reader, String key, Map<String, Schema> knownRecords)
        throws IOException {
    if (!key.equals(reader.nextName())) {
        throw new IOException("Property \"" + key + "\" missing.");
    }
    return read(reader, knownRecords);
}

From source file:co.cask.common.internal.io.SchemaTypeAdapter.java

License:Apache License

/**
 * Reads json value and convert it into {@link Schema} object.
 *
 * @param reader Source of json//  w w w  . j  a va 2  s.  c o  m
 * @param knownRecords Set of record name already encountered during the reading.
 * @return A {@link Schema} reflecting the json.
 * @throws java.io.IOException Any error during reading.
 */
private Schema read(JsonReader reader, Set<String> knownRecords) throws IOException {
    JsonToken token = reader.peek();
    switch (token) {
    case NULL:
        return null;
    case STRING: {
        // Simple type or know record type
        String name = reader.nextString();
        if (knownRecords.contains(name)) {
            return Schema.recordOf(name);
        }
        return Schema.of(Schema.Type.valueOf(name.toUpperCase()));
    }
    case BEGIN_ARRAY:
        // Union type
        return readUnion(reader, knownRecords);
    case BEGIN_OBJECT: {
        reader.beginObject();
        String name = reader.nextName();
        if (!"type".equals(name)) {
            throw new IOException("Property \"type\" missing.");
        }
        Schema.Type schemaType = Schema.Type.valueOf(reader.nextString().toUpperCase());

        Schema schema;
        switch (schemaType) {
        case ENUM:
            schema = readEnum(reader);
            break;
        case ARRAY:
            schema = readArray(reader, knownRecords);
            break;
        case MAP:
            schema = readMap(reader, knownRecords);
            break;
        case RECORD:
            schema = readRecord(reader, knownRecords);
            break;
        default:
            schema = Schema.of(schemaType);
        }
        reader.endObject();
        return schema;
    }
    }
    throw new IOException("Malformed schema input.");
}

From source file:co.cask.common.internal.io.SchemaTypeAdapter.java

License:Apache License

/**
 * Constructs {@link Schema.Type#ENUM ENUM} type schema from the json input.
 *
 * @param reader The {@link JsonReader} for streaming json input tokens.
 * @return A {@link Schema} of type {@link Schema.Type#ENUM ENUM}.
 * @throws java.io.IOException When fails to construct a valid schema from the input.
 *///from  w ww  . j ava 2s .  co m
private Schema readEnum(JsonReader reader) throws IOException {
    if (!"symbols".equals(reader.nextName())) {
        throw new IOException("Property \"symbols\" missing for enum.");
    }
    ImmutableList.Builder<String> enumValues = ImmutableList.builder();
    reader.beginArray();
    while (reader.peek() != JsonToken.END_ARRAY) {
        enumValues.add(reader.nextString());
    }
    reader.endArray();
    return Schema.enumWith(enumValues.build());
}

From source file:co.cask.common.internal.io.SchemaTypeAdapter.java

License:Apache License

/**
 * Constructs {@link Schema.Type#RECORD RECORD} type schema from the json input.
 *
 * @param reader The {@link JsonReader} for streaming json input tokens.
 * @param knownRecords Set of record name already encountered during the reading.
 * @return A {@link Schema} of type {@link Schema.Type#RECORD RECORD}.
 * @throws java.io.IOException When fails to construct a valid schema from the input.
 */// w  w  w.j  a  v a2 s . com
private Schema readRecord(JsonReader reader, Set<String> knownRecords) throws IOException {
    if (!"name".equals(reader.nextName())) {
        throw new IOException("Property \"name\" missing for record.");
    }

    String recordName = reader.nextString();

    // Read in fields schemas
    if (!"fields".equals(reader.nextName())) {
        throw new IOException("Property \"fields\" missing for record.");
    }

    knownRecords.add(recordName);

    ImmutableList.Builder<Schema.Field> fieldBuilder = ImmutableList.builder();
    reader.beginArray();
    while (reader.peek() != JsonToken.END_ARRAY) {
        reader.beginObject();
        if (!"name".equals(reader.nextName())) {
            throw new IOException("Property \"name\" missing for record field.");
        }
        String fieldName = reader.nextString();
        fieldBuilder.add(Schema.Field.of(fieldName, readInnerSchema(reader, "type", knownRecords)));
        reader.endObject();
    }
    reader.endArray();
    return Schema.recordOf(recordName, fieldBuilder.build());
}

From source file:co.cask.common.internal.io.SchemaTypeAdapter.java

License:Apache License

/**
 * Constructs a {@link Schema} from the "key":"schema" pair.
 *
 * @param reader The {@link JsonReader} for streaming json input tokens.
 * @param key The json property name that need to match.
 * @param knownRecords Set of record name already encountered during the reading.
 * @return A {@link Schema} object representing the schema of the json input.
 * @throws java.io.IOException When fails to construct a valid schema from the input.
 *//*from   w w w. ja v  a 2  s .com*/
private Schema readInnerSchema(JsonReader reader, String key, Set<String> knownRecords) throws IOException {
    if (!key.equals(reader.nextName())) {
        throw new IOException("Property \"" + key + "\" missing.");
    }
    return read(reader, knownRecords);
}

From source file:co.moonmonkeylabs.flowmortarexampleapp.common.flow.GsonParceler.java

License:Apache License

private Object decode(String json) throws IOException {
    JsonReader reader = new JsonReader(new StringReader(json));

    try {/*from  w w w.  j  a va2 s. co m*/
        reader.beginObject();

        Class<?> type = Class.forName(reader.nextName());
        return gson.fromJson(reader, type);
    } catch (ClassNotFoundException e) {
        throw new RuntimeException(e);
    } finally {
        reader.close();
    }
}

From source file:com.aelitis.azureus.util.ObjectTypeAdapterLong.java

License:Apache License

@Override
public Object read(JsonReader in) throws IOException {
    JsonToken token = in.peek();//ww  w  .ja  v a2 s  .  c o  m
    switch (token) {
    case BEGIN_ARRAY:
        List<Object> list = new ArrayList<Object>();
        in.beginArray();
        while (in.hasNext()) {
            list.add(read(in));
        }
        in.endArray();
        return list;

    case BEGIN_OBJECT:
        Map<String, Object> map = new LinkedTreeMap<String, Object>();
        in.beginObject();
        while (in.hasNext()) {
            map.put(in.nextName(), read(in));
        }
        in.endObject();
        return map;

    case STRING:
        return in.nextString();

    case NUMBER: {
        String value = in.nextString();
        if (value.indexOf('.') >= 0) {
            return Double.parseDouble(value);
        } else {
            return Long.parseLong(value);
        }
    }

    case BOOLEAN:
        return in.nextBoolean();

    case NULL:
        in.nextNull();
        return null;

    default:
        throw new IllegalStateException();
    }
}

From source file:com.aliyun.openservices.odps.console.common.JobDetailInfo.java

License:Apache License

private List<FuxiJob> loadJobsFromStream(InputStream in) throws ODPSConsoleException {
    boolean debug = true;
    ArrayList<FuxiJob> jobs = new ArrayList<FuxiJob>();
    if (debug) {/* w w  w.  ja va 2  s. co  m*/
        try {
            JsonReader reader = new JsonReader(new InputStreamReader(in, "UTF-8"));
            reader.beginObject();
            while (reader.hasNext()) {
                String name = reader.nextName();
                if (name.equals("mapReduce")) {
                    reader.beginObject();
                    while (reader.hasNext()) {
                        String nameInMapReduce = reader.nextName();
                        if (nameInMapReduce.equals("jobs")) {
                            reader.beginArray();
                            while (reader.hasNext()) {
                                jobs.add(getFuxiJobFromJson(reader));
                            }
                            reader.endArray();
                        } else if (nameInMapReduce.equals("jsonSummary")) {
                            getInfoFromJsonSummary(jobs, reader.nextString());
                        } else {
                            reader.skipValue();
                        }
                    }
                    reader.endObject();
                } else {
                    reader.skipValue();
                }
            }
            reader.endObject();
        } catch (IOException e) {
            e.printStackTrace();
            throw new ODPSConsoleException("Bad json format");
        }
    }

    return jobs;
}

From source file:com.aliyun.openservices.odps.console.common.JobDetailInfo.java

License:Apache License

private FuxiJob getFuxiJobFromJson(JsonReader reader) throws IOException {
    FuxiJob job = new FuxiJob();

    reader.beginObject();//from   w  w  w  . j a  v  a  2s.  c o  m
    while (reader.hasNext()) {
        String nameInJob = reader.nextName();
        if (nameInJob.equals("name")) {
            job.name = reader.nextString();
        } else if (nameInJob.equals("tasks")) {
            reader.beginArray();
            job.tasks = new ArrayList<FuxiTask>();
            while (reader.hasNext()) {
                job.tasks.add(getFuxiTaskFromJson(reader));
            }
            reader.endArray();
        } else {
            reader.skipValue();
        }
    }
    reader.endObject();
    return job;
}

From source file:com.aliyun.openservices.odps.console.common.JobDetailInfo.java

License:Apache License

private FuxiTask getFuxiTaskFromJson(JsonReader reader) throws IOException {
    FuxiTask task = new FuxiTask();

    reader.beginObject();/*from   w  ww  .j  a v a2s  .  c o m*/
    while (reader.hasNext()) {
        String nameInTask = reader.nextName();
        if (nameInTask.equals("name")) {
            task.name = reader.nextString();
        } else if (nameInTask.equals("instances")) {
            task.instances = new ArrayList<FuxiInstance>();
            task.upTasks = new ArrayList<FuxiTask>();
            task.downTasks = new ArrayList<FuxiTask>();
            reader.beginArray();
            while (reader.hasNext()) {
                task.instances.add(getFuxiInstanceFromJson(reader));
            }
            reader.endArray();
        } else {
            reader.skipValue();
        }
    }
    reader.endObject();
    return task;
}