org.apache.ignite.binary

Interface BinaryObjectBuilder

public interface BinaryObjectBuilder

Binary object builder. Provides ability to build binary objects dynamically without having class definitions.

Here is an example of how a binary object can be built dynamically:

 BinaryObjectBuilder builder = Ignition.ignite().binary().builder("org.project.MyObject");

 builder.setField("fieldA", "A");
 builder.setField("fieldB", "B");

 BinaryObject binaryObj = builder.build();
 

Also builder can be initialized by existing binary object. This allows changing some fields without affecting other fields.

 BinaryObjectBuilder builder = Ignition.ignite().binary().builder(person);

 builder.setField("name", "John");

 person = builder.build();
 

If you need to modify nested binary object you can get an instance of a builder for nested binary object using getField(String), changes made on nested builder will affect parent object, for example:

 BinaryObjectBuilder personBuilder = grid.binary().createBuilder(personBinaryObj);
 BinaryObjectBuilder addressBuilder = personBuilder.getField("address");

 addressBuilder.setField("city", "New York");

 personBinaryObj = personBuilder.build();

 // Should be "New York".
 String city = personBinaryObj.getField("address").getField("city");
 

Make sure to set values for all the fields that an object from your domain model has. If you need to set null as a value use setField(String, Object, Class) method directly specifying field's type.

If to follow this recommendation you'll reduce the size of internal metadata object that every binary object of a particular type has. Usually the metadata size grows because particular fields are not set to an instance of a binary object constructed with the builder. Every time when you construct an object setting only a subset of the fields the metadata object related to this type is expanded by the metadata processor which treats every new combination of the fields as the new version of the binary object.

See Also:

IgniteBinary.builder(String), IgniteBinary.builder(BinaryObject)

Method Summary

Modifier and Type	Method and Description
BinaryObject	build() Builds binary object.
<T> T	getField(String name) Returns value assigned to the specified field.
BinaryObjectBuilder	removeField(String fieldName) Removes field from this builder.
BinaryObjectBuilder	setField(String name, BinaryObjectBuilder builder) Sets field value.
BinaryObjectBuilder	setField(String name, Object val) Sets field value.
<T> BinaryObjectBuilder	setField(String name, T val, Class<? super T> type) Sets field value with value type specification.

Method Detail

getField

<T> T getField(String name)

Returns value assigned to the specified field. If the value is a binary object then an instance of BinaryObjectBuilder will be returned, which can be modified.

Collections and maps returned from this method are modifiable.

Parameters:

name - Field name.

Returns:

Field value.

setField

BinaryObjectBuilder setField(String name,
                             Object val)

Sets field value.

Parameters:

name - Field name.

val - Field value (cannot be null).

See Also:

BinaryObject.type()

setField

<T> BinaryObjectBuilder setField(String name,
                                 T val,
                                 Class<? super T> type)

Sets field value with value type specification.

Field type is needed for proper metadata update.

Parameters:

name - Field name.

val - Field value (may be null).

type - Field type.

See Also:

BinaryObject.type()

setField

BinaryObjectBuilder setField(String name,
                             BinaryObjectBuilder builder)

Sets field value.

This method should be used if field is binary object.

Parameters:

name - Field name.

builder - Builder for object field (may be null).

removeField

BinaryObjectBuilder removeField(String fieldName)

Removes field from this builder.

Parameters:

fieldName - Field name.

Returns:

this instance for chaining.

build

BinaryObject build()
            throws BinaryObjectException

Builds binary object.

Returns:

Binary object.

Throws:

BinaryObjectException - In case of error.