Apex Developer Guide

Apex Developer Guide
Getting Started with Apex
Writing Apex
Running Apex
Debugging, Testing, and Deploying Apex
Apex Language Reference
Apex DML Operations
ApexPages Namespace
AppLauncher Namespace
Approval Namespace
Auth Namespace
Cache Namespace
Canvas Namespace
ChatterAnswers Namespace
CommercePayments Namespace
ConnectApi Namespace
Database Namespace
Datacloud Namespace
DataSource Namespace
Dom Namespace
EventBus Namespace
Flow Namespace
Functions Namespace (Beta)
KbManagement Namespace
LxScheduler Namespace
Messaging Namespace
Metadata Namespace
Process Namespace
QuickAction Namespace
Reports Namespace
Schema Namespace
Search Namespace
Sfc Namespace
Sfdc_Checkout Namespace
Site Namespace
Support Namespace
System Namespace
AccessType Enum
Address Class
Answers Class
ApexPages Class
Approval Class
Blob Class
Boolean Class
BusinessHours Class
Callable Interface
Cases Class
Comparable Interface
Continuation Class
Cookie Class
Crypto Class
Custom Metadata Type Methods
Custom Settings Methods
Database Class
Date Class
Datetime Class
Decimal Class
Double Class
EncodingUtil Class
Enum Methods
EventBus Class
Exception Class and Built-In Exceptions
FlexQueue Class
FeatureManagement Class
Formula Class
FormulaRecalcFieldError Class
FormulaRecalcResult Class
Http Class
HttpCalloutMock Interface
HttpRequest Class
HttpResponse Class
Id Class
Ideas Class
InstallHandler Interface
Integer Class
JSON Class
JSONGenerator Class
JSONGenerator Methods
JSONParser Class
JSONToken Enum
Limits Class
List Class
Location Class
Long Class
Map Class
Matcher Class
Math Class
Messaging Class
MultiStaticResourceCalloutMock Class
Network Class
OrgLimit Class
OrgLimits Class
PageReference Class
Packaging Class
Pattern Class
Queueable Interface
QueueableContext Interface
QuickAction Class
Quiddity Enum
RemoteObjectController
Request Class
ResetPasswordResult Class
RestContext Class
RestRequest Class
RestResponse Class
SandboxPostCopy Interface
Schedulable Interface
SchedulableContext Interface
Schema Class
Search Class
Security Class
SelectOption Class
Set Class
Site Class
SObject Class
SObjectAccessDecision Class
StaticResourceCalloutMock Class
String Class
StubProvider Interface
System Class
Test Class
Time Class
TimeZone Class
Trigger Class
TriggerOperation Enum
Type Class
UninstallHandler Interface
URL Class
UserInfo Class
UserManagement Class
Version Class
WebServiceCallout Class
WebServiceMock Interface
XmlStreamReader Class
XmlStreamWriter Class
TerritoryMgmt Namespace
TxnSecurity Namespace
UserProvisioning Namespace
VisualEditor Namespace
wave Namespace
Appendices
Glossary
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JSONGenerator Class

Contains methods used to serialize objects into JSON content using the standard JSON encoding.

Namespace

System

Usage

The System.JSONGenerator class is provided to enable the generation of standard JSON-encoded content and gives you more control on the structure of the JSON output.

JSONGenerator Methods

The following are methods for JSONGenerator. All are instance methods.

close()

Closes the JSON generator.

Signature

public Void close()

Return Value

Type: Void

Usage

No more content can be written after the JSON generator is closed.

getAsString()

Returns the generated JSON content.

Signature

public String getAsString()

Return Value

Type: String

Usage

This method closes the JSON generator if it isn't closed already.

isClosed()

Returns true if the JSON generator is closed; otherwise, returns false.

Signature

public Boolean isClosed()

Return Value

Type: Boolean

writeBlob(blobValue)

Writes the specified Blob value as a base64-encoded string.

Signature

public Void writeBlob(Blob blobValue)

Parameters

blobValue
Type: Blob

Return Value

Type: Void

writeBlobField(fieldName, blobValue)

Writes a field name and value pair using the specified field name and BLOB value.

Signature

public Void writeBlobField(String fieldName, Blob blobValue)

Parameters

fieldName
Type: String
blobValue
Type: Blob

Return Value

Type: Void

writeBoolean(blobValue)

Writes the specified Boolean value.

Signature

public Void writeBoolean(Boolean blobValue)

Parameters

blobValue
Type: Boolean

Return Value

Type: Void

writeBooleanField(fieldName, booleanValue)

Writes a field name and value pair using the specified field name and Boolean value.

Signature

public Void writeBooleanField(String fieldName, Boolean booleanValue)

Parameters

fieldName
Type: String
booleanValue
Type: Boolean

Return Value

Type: Void

writeDate(dateValue)

Writes the specified date value in the ISO-8601 format.

Signature

public Void writeDate(Date dateValue)

Parameters

dateValue
Type: Date

Return Value

Type: Void

writeDateField(fieldName, dateValue)

Writes a field name and value pair using the specified field name and date value. The date value is written in the ISO-8601 format.

Signature

public Void writeDateField(String fieldName, Date dateValue)

Parameters

fieldName
Type: String
dateValue
Type: Date

Return Value

Type: Void

writeDateTime(datetimeValue)

Writes the specified date and time value in the ISO-8601 format.

Signature

public Void writeDateTime(Datetime datetimeValue)

Parameters

datetimeValue
Type: Datetime

Return Value

Type: Void

writeDateTimeField(fieldName, datetimeValue)

Writes a field name and value pair using the specified field name and date and time value. The date and time value is written in the ISO-8601 format.

Signature

public Void writeDateTimeField(String fieldName, Datetime datetimeValue)

Parameters

fieldName
Type: String
datetimeValue
Type: Datetime

Return Value

Type: Void

writeEndArray()

Writes the ending marker of a JSON array (']').

Signature

public Void writeEndArray()

Return Value

Type: Void

writeEndObject()

Writes the ending marker of a JSON object ('}').

Signature

public Void writeEndObject()

Return Value

Type: Void

writeFieldName(fieldName)

Writes a field name.

Signature

public Void writeFieldName(String fieldName)

Parameters

fieldName
Type: String

Return Value

Type: Void

writeId(identifier)

Writes the specified ID value.

Signature

public Void writeId(ID identifier)

Parameters

identifier
Type: ID

Return Value

Type: Void

writeIdField(fieldName, identifier)

Writes a field name and value pair using the specified field name and identifier value.

Signature

public Void writeIdField(String fieldName, Id identifier)

Parameters

fieldName
Type: String
identifier
Type: ID

Return Value

Type: Void

writeNull()

Writes the JSON null literal value.

Signature

public Void writeNull()

Return Value

Type: Void

writeNullField(fieldName)

Writes a field name and value pair using the specified field name and the JSON null literal value.

Signature

public Void writeNullField(String fieldName)

Parameters

fieldName
Type: String

Return Value

Type: Void

writeNumber(number)

Writes the specified decimal value.

Signature

public Void writeNumber(Decimal number)

Parameters

number
Type: Decimal

Return Value

Type: Void

writeNumber(number)

Writes the specified double value.

Signature

public Void writeNumber(Double number)

Parameters

number
Type: Double

Return Value

Type: Void

writeNumber(number)

Writes the specified integer value.

Signature

public Void writeNumber(Integer number)

Parameters

number
Type: Integer

Return Value

Type: Void

writeNumber(number)

Writes the specified long value.

Signature

public Void writeNumber(Long number)

Parameters

number
Type: Long

Return Value

Type: Void

writeNumberField(fieldName, number)

Writes a field name and value pair using the specified field name and decimal value.

Signature

public Void writeNumberField(String fieldName, Decimal number)

Parameters

fieldName
Type: String
number
Type: Decimal

Return Value

Type: Void

writeNumberField(fieldName, number)

Writes a field name and value pair using the specified field name and double value.

Signature

public Void writeNumberField(String fieldName, Double number)

Parameters

fieldName
Type: String
number
Type: Double

Return Value

Type: Void

writeNumberField(fieldName, number)

Writes a field name and value pair using the specified field name and integer value.

Signature

public Void writeNumberField(String fieldName, Integer number)

Parameters

fieldName
Type: String
number
Type: Integer

Return Value

Type: Void

writeNumberField(fieldName, number)

Writes a field name and value pair using the specified field name and long value.

Signature

public Void writeNumberField(String fieldName, Long number)

Parameters

fieldName
Type: String
number
Type: Long

Return Value

Type: Void

writeObject(anyObject)

Writes the specified Apex object in JSON format.

Signature

public Void writeObject(Object anyObject)

Parameters

anyObject
Type: Object

Return Value

Type: Void

writeObjectField(fieldName, value)

Writes a field name and value pair using the specified field name and Apex object.

Signature

public Void writeObjectField(String fieldName, Object value)

Parameters

fieldName
Type: String
value
Type: Object

Return Value

Type: Void

writeStartArray()

Writes the starting marker of a JSON array ('[').

Signature

public Void writeStartArray()

Return Value

Type: Void

writeStartObject()

Writes the starting marker of a JSON object ('{').

Signature

public Void writeStartObject()

Return Value

Type: Void

writeString(stringValue)

Writes the specified string value.

Signature

public Void writeString(String stringValue)

Parameters

stringValue
Type: String

Return Value

Type: Void

writeStringField(fieldName, stringValue)

Writes a field name and value pair using the specified field name and string value.

Signature

public Void writeStringField(String fieldName, String stringValue)

Parameters

fieldName
Type: String
stringValue
Type: String

Return Value

Type: Void

writeTime(timeValue)

Writes the specified time value in the ISO-8601 format.

Signature

public Void writeTime(Time timeValue)

Parameters

timeValue
Type: Time

Return Value

Type: Void

writeTimeField(fieldName, timeValue)

Writes a field name and value pair using the specified field name and time value in the ISO-8601 format.

Signature

public Void writeTimeField(String fieldName, Time timeValue)

Parameters

fieldName
Type: String
timeValue
Type: Time

Return Value

Type: Void