Example usage for com.fasterxml.jackson.core JsonGenerator writeNull

Introduction

In this page you can find the example usage for com.fasterxml.jackson.core JsonGenerator writeNull.

Prototype

public abstract void writeNull() throws IOException, JsonGenerationException;

Source Link

Document

Method for outputting literal Json null value.

Usage

From source file:com.streamsets.datacollector.http.JMXJsonServlet.java

private void writeObject(JsonGenerator jg, Object value) throws IOException {
    if (value == null) {
        jg.writeNull();
    } else {//from  www  .  j  av  a 2s  .co  m
        Class<?> c = value.getClass();
        if (c.isArray()) {
            jg.writeStartArray();
            int len = Array.getLength(value);
            for (int j = 0; j < len; j++) {
                Object item = Array.get(value, j);
                writeObject(jg, item);
            }
            jg.writeEndArray();
        } else if (value instanceof Number) {
            Number n = (Number) value;
            jg.writeNumber(n.toString());
        } else if (value instanceof Boolean) {
            Boolean b = (Boolean) value;
            jg.writeBoolean(b);
        } else if (value instanceof CompositeData) {
            CompositeData cds = (CompositeData) value;
            CompositeType comp = cds.getCompositeType();
            Set<String> keys = comp.keySet();
            jg.writeStartObject();
            for (String key : keys) {
                writeAttribute(jg, key, cds.get(key));
            }
            jg.writeEndObject();
        } else if (value instanceof TabularData) {
            TabularData tds = (TabularData) value;
            jg.writeStartArray();
            for (Object entry : tds.values()) {
                writeObject(jg, entry);
            }
            jg.writeEndArray();
        } else if (value instanceof GaugeValue) {
            ((GaugeValue) value).serialize(jg);
        } else {
            jg.writeString(value.toString());
        }
    }
}

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From source file:org.mycontroller.standalone.api.jaxrs.mixins.RuleDefinitionMixin.java

@Override
public void serialize(RuleDefinitionTable ruleDefinitionTable, JsonGenerator jgen, SerializerProvider provider)
        throws IOException, JsonProcessingException {
    if (ruleDefinitionTable != null) {
        RestUtils.getObjectMapper().writeValue(jgen, RuleUtils.getRuleDefinition(ruleDefinitionTable));
    } else {/*from   w  ww  . j a v  a2 s . c o  m*/
        jgen.writeNull();
    }

}

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From source file:io.pdef.json.JsonJacksonFormat.java

private <T> void write(final T object, final DataTypeDescriptor<T> descriptor, final JsonGenerator generator)
        throws IOException {
    if (object == null) {
        generator.writeNull();
        return;/*from ww w. ja  v a 2  s.  co  m*/
    }

    switch (descriptor.getType()) {
    case BOOL:
        generator.writeBoolean((Boolean) object);
        break;
    case INT16:
        generator.writeNumber((Short) object);
        break;
    case INT32:
        generator.writeNumber((Integer) object);
        break;
    case INT64:
        generator.writeNumber((Long) object);
        break;
    case FLOAT:
        generator.writeNumber((Float) object);
        break;
    case DOUBLE:
        generator.writeNumber((Double) object);
        break;
    case STRING:
        generator.writeString((String) object);
        break;
    case DATETIME:
        writeDatetime((Date) object, generator);
        break;
    case LIST:
        writeList((List) object, (ListDescriptor) descriptor, generator);
        break;
    case SET:
        writeSet((Set) object, (SetDescriptor) descriptor, generator);
        break;
    case MAP:
        writeMap((Map) object, (MapDescriptor) descriptor, generator);
        break;
    case VOID:
        generator.writeNull();
        break;
    case ENUM:
        writeEnum((Enum) object, generator);
        break;
    case MESSAGE:
        writeMessage((Message) object, generator);
        break;
    default:
        throw new JsonFormatException("Unsupported descriptor " + descriptor);
    }
}

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From source file:org.dbrain.data.jackson.serializers.JsonBigDecimalSerializer.java

@Override
public void serialize(BigDecimal value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
    if (value != null) {
        // Does it have more that 15 significant digits ?
        BigInteger unscaled = value.unscaledValue();
        if (unscaled.compareTo(MIN_VALUE) >= 0 && unscaled.compareTo(MAX_VALUE) <= 0) {
            jgen.writeNumber(value);//from   w  ww  .j  a  va2  s . c  om
        } else {
            jgen.writeString(value.toString());
        }
    } else {
        jgen.writeNull();
    }
}

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From source file:com.skcraft.launcher.model.minecraft.PlatformSerializer.java

@Override
public void serialize(Platform platform, JsonGenerator jsonGenerator, SerializerProvider serializerProvider)
        throws IOException, JsonProcessingException {
    switch (platform) {
    case WINDOWS:
        jsonGenerator.writeString("windows");
        break;/*from  w  ww  .j  a v a  2s .co m*/
    case MAC_OS_X:
        jsonGenerator.writeString("osx");
        break;
    case LINUX:
        jsonGenerator.writeString("linux");
        break;
    case SOLARIS:
        jsonGenerator.writeString("solaris");
        break;
    case UNKNOWN:
        jsonGenerator.writeNull();
        break;
    }
}

---

From source file:net.solarnetwork.web.support.JSONView.java

private void generateJavaBeanObject(JsonGenerator json, String key, Object bean,
        PropertyEditorRegistrar registrar) throws JsonGenerationException, IOException {
    if (key != null) {
        json.writeFieldName(key);/*from  w ww. j  a  v a 2 s .  c o  m*/
    }
    if (bean == null) {
        json.writeNull();
        return;
    }
    BeanWrapper wrapper = getPropertyAccessor(bean, registrar);
    PropertyDescriptor[] props = wrapper.getPropertyDescriptors();
    json.writeStartObject();
    for (PropertyDescriptor prop : props) {
        String name = prop.getName();
        if (this.getJavaBeanIgnoreProperties() != null && this.getJavaBeanIgnoreProperties().contains(name)) {
            continue;
        }
        if (wrapper.isReadableProperty(name)) {
            Object propVal = wrapper.getPropertyValue(name);
            if (propVal != null) {

                // test for SerializeIgnore
                Method getter = prop.getReadMethod();
                if (getter != null && getter.isAnnotationPresent(SerializeIgnore.class)) {
                    continue;
                }

                if (getPropertySerializerRegistrar() != null) {
                    propVal = getPropertySerializerRegistrar().serializeProperty(name, propVal.getClass(), bean,
                            propVal);
                } else {
                    // Spring does not apply PropertyEditors on read methods, so manually handle
                    PropertyEditor editor = wrapper.findCustomEditor(null, name);
                    if (editor != null) {
                        editor.setValue(propVal);
                        propVal = editor.getAsText();
                    }
                }
                if (propVal instanceof Enum<?> || getJavaBeanTreatAsStringValues() != null
                        && getJavaBeanTreatAsStringValues().contains(propVal.getClass())) {
                    propVal = propVal.toString();
                }
                writeJsonValue(json, name, propVal, registrar);
            }
        }
    }
    json.writeEndObject();
}

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From source file:data.DefaultExchanger.java

protected void putInt(JsonGenerator generator, String fieldName, ResultSet rs, short index)
        throws SQLException, IOException {
    generator.writeFieldName(fieldName);
    int value = rs.getInt(index);
    if (rs.wasNull()) {
        generator.writeNull();
    } else {//from w ww .jav  a2s. c om
        generator.writeNumber(value);
    }
}

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From source file:data.DefaultExchanger.java

protected void putDate(JsonGenerator generator, String fieldName, ResultSet rs, short index)
        throws SQLException, IOException {
    generator.writeFieldName(fieldName);
    Date date = rs.getDate(index);
    if (date == null) {
        generator.writeNull();
    } else {/*from   w w w.  ja  v  a2s.co m*/
        generator.writeNumber(date.getTime());
    }
}

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From source file:data.DefaultExchanger.java

protected void putLong(JsonGenerator generator, String fieldName, ResultSet rs, short index)
        throws SQLException, IOException {
    generator.writeFieldName(fieldName);
    long value = rs.getLong(index);
    if (rs.wasNull()) {
        generator.writeNull();
    } else {/*  w w w  .  j  a v  a  2 s . com*/
        generator.writeNumber(value);
    }
}

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From source file:data.DefaultExchanger.java

protected void putString(JsonGenerator generator, String fieldName, ResultSet rs, short index)
        throws SQLException, IOException {
    generator.writeFieldName(fieldName);
    String string = rs.getString(index);
    if (string == null) {
        generator.writeNull();
    } else {//  w  w  w  .j  a  v  a2 s  .  c  o m
        generator.writeString(string);
    }
}

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