Package org.elasticsearch.common.xcontent

Class XContentParserUtils

java.lang.Object

org.elasticsearch.common.xcontent.XContentParserUtils

public final class XContentParserUtils
extends Object

A set of static methods to get XContentParser.Token from XContentParser while checking for their types and throw ParsingException if needed.

Method Summary

Modifier and Type	Method	Description
static void	ensureExpectedToken(XContentParser.Token expected, XContentParser.Token actual, XContentParser parser)	Makes sure that provided token is of the expected type
static void	ensureFieldName(XContentParser parser, XContentParser.Token token, String fieldName)	Makes sure that current token is of type XContentParser.Token.FIELD_NAME and the field name is equal to the provided one
static Object	parseFieldsValue(XContentParser parser)	Parse the current token depending on its token type.
static <T> List<T>	parseList(XContentParser parser, CheckedFunction<XContentParser,T,IOException> valueParser)	Parses a list of a given type from the given parser.
static <T> void	parseTypedKeysObject(XContentParser parser, String delimiter, Class<T> objectClass, Consumer<T> consumer)	This method expects that the current field name is the concatenation of a type, a delimiter and a name (ex: terms#foo where "terms" refers to the type of a registered NamedXContentRegistry.Entry, "#" is the delimiter and "foo" the name of the object to parse).
static void	throwUnknownField(String field, XContentLocation location)
static void	throwUnknownToken(XContentParser.Token token, XContentLocation location)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

ensureFieldName

public static void ensureFieldName(XContentParser parser,
 XContentParser.Token token,
 String fieldName)
                            throws IOException

Makes sure that current token is of type XContentParser.Token.FIELD_NAME and the field name is equal to the provided one

Throws:

ParsingException - if the token is not of type XContentParser.Token.FIELD_NAME or is not equal to the given field name

IOException

throwUnknownField

public static void throwUnknownField(String field,
 XContentLocation location)

Throws:

ParsingException - with a "unknown field found" reason

throwUnknownToken

public static void throwUnknownToken(XContentParser.Token token,
 XContentLocation location)

Throws:

ParsingException - with a "unknown token found" reason

ensureExpectedToken

public static void ensureExpectedToken(XContentParser.Token expected,
 XContentParser.Token actual,
 XContentParser parser)

Makes sure that provided token is of the expected type

Throws:

ParsingException - if the token is not equal to the expected type

parseFieldsValue

public static Object parseFieldsValue(XContentParser parser)
                               throws IOException

Parse the current token depending on its token type. The following token types will be parsed by the corresponding parser methods:

• XContentParser.Token.VALUE_STRING: XContentParser.text()
• XContentParser.Token.VALUE_NUMBER: XContentParser.numberValue() ()}
• XContentParser.Token.VALUE_BOOLEAN: XContentParser.booleanValue() ()}
• XContentParser.Token.VALUE_EMBEDDED_OBJECT: XContentParser.binaryValue() ()}
• XContentParser.Token.VALUE_NULL: returns null
• XContentParser.Token.START_OBJECT: XContentParser.mapOrdered() ()}
• XContentParser.Token.START_ARRAY: XContentParser.listOrderedMap() ()}

Throws:

ParsingException - if the token is none of the allowed values

IOException

parseTypedKeysObject

public static <T> void parseTypedKeysObject(XContentParser parser,
 String delimiter,
 Class<T> objectClass,
 Consumer<T> consumer)
                                     throws IOException

This method expects that the current field name is the concatenation of a type, a delimiter and a name (ex: terms#foo where "terms" refers to the type of a registered NamedXContentRegistry.Entry, "#" is the delimiter and "foo" the name of the object to parse). It also expected that following this field name is either an Object or an array xContent structure and the cursor points to the start token of this structure. The method splits the field's name to extract the type and name and then parses the object using the XContentParser.namedObject(Class, String, Object) method.

Type Parameters:

T - the type of the object to parse

Parameters:

parser - the current XContentParser

delimiter - the delimiter to use to splits the field's name

objectClass - the object class of the object to parse

consumer - something to consume the parsed object

Throws:

IOException - if anything went wrong during parsing or if the type or name cannot be derived from the field's name

ParsingException - if the parser isn't positioned on either START_OBJECT or START_ARRAY at the beginning

parseList

public static <T> List<T> parseList(XContentParser parser,
 CheckedFunction<XContentParser,T,IOException> valueParser)
                             throws IOException

Parses a list of a given type from the given parser. Assumes that the parser is currently positioned on a XContentParser.Token.START_ARRAY token and will fail if it is not. The returned list may or may not be mutable.

Parameters:

parser - x-content parser

valueParser - parser for expected list value type

Returns:

list parsed from parser

Throws:

IOException