Si está usando Jackson para hacer un montón de código JsonNode
, puede ser interesante en el siguiente conjunto de utilidades. El beneficio de usarlos es que admiten un estilo de encadenamiento más natural que muestra mejor la estructura del JSON en construcción.
Aquí es un ejemplo de uso:
import static JsonNodeBuilders.array;
import static JsonNodeBuilders.object;
...
val request = object("x", "1").with("y", array(object("z", "2"))).end();
que es equivalente a la siguiente JSON:
{"x":"1", "y": [{"z": "2"}]}
Estas son las clases:
import static lombok.AccessLevel.PRIVATE;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.JsonNodeFactory;
import com.fasterxml.jackson.databind.node.ObjectNode;
import lombok.NoArgsConstructor;
import lombok.NonNull;
import lombok.RequiredArgsConstructor;
import lombok.val;
/**
* Convenience {@link JsonNode} builder.
*/
@NoArgsConstructor(access = PRIVATE)
public final class JsonNodeBuilders {
/**
* Factory methods for an {@link ObjectNode} builder.
*/
public static ObjectNodeBuilder object() {
return object(JsonNodeFactory.instance);
}
public static ObjectNodeBuilder object(@NonNull String k1, boolean v1) {
return object().with(k1, v1);
}
public static ObjectNodeBuilder object(@NonNull String k1, int v1) {
return object().with(k1, v1);
}
public static ObjectNodeBuilder object(@NonNull String k1, float v1) {
return object().with(k1, v1);
}
public static ObjectNodeBuilder object(@NonNull String k1, String v1) {
return object().with(k1, v1);
}
public static ObjectNodeBuilder object(@NonNull String k1, String v1, @NonNull String k2, String v2) {
return object(k1, v1).with(k2, v2);
}
public static ObjectNodeBuilder object(@NonNull String k1, String v1, @NonNull String k2, String v2,
@NonNull String k3, String v3) {
return object(k1, v1, k2, v2).with(k3, v3);
}
public static ObjectNodeBuilder object(@NonNull String k1, JsonNodeBuilder<?> builder) {
return object().with(k1, builder);
}
public static ObjectNodeBuilder object(JsonNodeFactory factory) {
return new ObjectNodeBuilder(factory);
}
/**
* Factory methods for an {@link ArrayNode} builder.
*/
public static ArrayNodeBuilder array() {
return array(JsonNodeFactory.instance);
}
public static ArrayNodeBuilder array(@NonNull boolean... values) {
return array().with(values);
}
public static ArrayNodeBuilder array(@NonNull int... values) {
return array().with(values);
}
public static ArrayNodeBuilder array(@NonNull String... values) {
return array().with(values);
}
public static ArrayNodeBuilder array(@NonNull JsonNodeBuilder<?>... builders) {
return array().with(builders);
}
public static ArrayNodeBuilder array(JsonNodeFactory factory) {
return new ArrayNodeBuilder(factory);
}
public interface JsonNodeBuilder<T extends JsonNode> {
/**
* Construct and return the {@link JsonNode} instance.
*/
T end();
}
@RequiredArgsConstructor
private static abstract class AbstractNodeBuilder<T extends JsonNode> implements JsonNodeBuilder<T> {
/**
* The source of values.
*/
@NonNull
protected final JsonNodeFactory factory;
/**
* The value under construction.
*/
@NonNull
protected final T node;
/**
* Returns a valid JSON string, so long as {@code POJONode}s not used.
*/
@Override
public String toString() {
return node.toString();
}
}
public final static class ObjectNodeBuilder extends AbstractNodeBuilder<ObjectNode> {
private ObjectNodeBuilder(JsonNodeFactory factory) {
super(factory, factory.objectNode());
}
public ObjectNodeBuilder withNull(@NonNull String field) {
return with(field, factory.nullNode());
}
public ObjectNodeBuilder with(@NonNull String field, int value) {
return with(field, factory.numberNode(value));
}
public ObjectNodeBuilder with(@NonNull String field, float value) {
return with(field, factory.numberNode(value));
}
public ObjectNodeBuilder with(@NonNull String field, boolean value) {
return with(field, factory.booleanNode(value));
}
public ObjectNodeBuilder with(@NonNull String field, String value) {
return with(field, factory.textNode(value));
}
public ObjectNodeBuilder with(@NonNull String field, JsonNode value) {
node.set(field, value);
return this;
}
public ObjectNodeBuilder with(@NonNull String field, @NonNull JsonNodeBuilder<?> builder) {
return with(field, builder.end());
}
public ObjectNodeBuilder withPOJO(@NonNull String field, @NonNull Object pojo) {
return with(field, factory.pojoNode(pojo));
}
@Override
public ObjectNode end() {
return node;
}
}
public final static class ArrayNodeBuilder extends AbstractNodeBuilder<ArrayNode> {
private ArrayNodeBuilder(JsonNodeFactory factory) {
super(factory, factory.arrayNode());
}
public ArrayNodeBuilder with(boolean value) {
node.add(value);
return this;
}
public ArrayNodeBuilder with(@NonNull boolean... values) {
for (val value : values)
with(value);
return this;
}
public ArrayNodeBuilder with(int value) {
node.add(value);
return this;
}
public ArrayNodeBuilder with(@NonNull int... values) {
for (val value : values)
with(value);
return this;
}
public ArrayNodeBuilder with(float value) {
node.add(value);
return this;
}
public ArrayNodeBuilder with(String value) {
node.add(value);
return this;
}
public ArrayNodeBuilder with(@NonNull String... values) {
for (val value : values)
with(value);
return this;
}
public ArrayNodeBuilder with(@NonNull Iterable<String> values) {
for (val value : values)
with(value);
return this;
}
public ArrayNodeBuilder with(JsonNode value) {
node.add(value);
return this;
}
public ArrayNodeBuilder with(@NonNull JsonNode... values) {
for (val value : values)
with(value);
return this;
}
public ArrayNodeBuilder with(JsonNodeBuilder<?> value) {
return with(value.end());
}
public ArrayNodeBuilder with(@NonNull JsonNodeBuilder<?>... builders) {
for (val builder : builders)
with(builder);
return this;
}
@Override
public ArrayNode end() {
return node;
}
}
}
Tenga en cuenta que la aplicación utiliza Lombok , pero puede desaguarlo fácilmente para completar el texto estándar de Java.
No creo que haya visto ninguna biblioteca JSON que siga ese estilo. ¿Tal vez podría ampliar una biblioteca existente para hacer lo que quiere? – aroth
@aroth: estoy escribiendo un resumen sobre com.google.gson mientras hablamos. – ripper234
Casi listo - http://stackoverflow.com/questions/8876271/how-to-serialize-a-jsonobject-without-too-much-quotes – ripper234