org.apache.ambari.server.api.predicate

Class QueryLexer

java.lang.Object

org.apache.ambari.server.api.predicate.QueryLexer

public class QueryLexer
extends Object

Scans a query expression and generates an array of tokens. Each token contains type and value information. First, the query expression is broken down into string tokens using a regular expression which splits on a set of deliminators which includes operators and brackets. Second, each string token is converted into a Token with type and value information.

Field Summary

Fields

Modifier and Type	Field and Description
static String	QUERY_DOAS
static String	QUERY_FIELDS Query string constants.
static String	QUERY_FORMAT
static String	QUERY_FROM
static String	QUERY_MINIMAL
static String	QUERY_PAGE_SIZE
static String	QUERY_SORT
static String	QUERY_TO

Constructor Summary

Constructors

Constructor and Description
QueryLexer() Constructor.

Method Summary

Modifier and Type	Method and Description
Token[]	tokens(String exp) Scan the provided query and generate a token stream to be used by the query parser.
Token[]	tokens(String exp, Collection<String> ignoreProperties) Scan the provided query and generate a token stream to be used by the query parser.

Methods inherited from class java.lang.Object

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

Field Detail

QUERY_FIELDS

public static final String QUERY_FIELDS

Query string constants.

See Also:

Constant Field Values

QUERY_FORMAT

public static final String QUERY_FORMAT

See Also:

Constant Field Values

QUERY_PAGE_SIZE

public static final String QUERY_PAGE_SIZE

See Also:

Constant Field Values

QUERY_TO

public static final String QUERY_TO

See Also:

Constant Field Values

QUERY_FROM

public static final String QUERY_FROM

See Also:

Constant Field Values

QUERY_MINIMAL

public static final String QUERY_MINIMAL

See Also:

Constant Field Values

QUERY_SORT

public static final String QUERY_SORT

See Also:

Constant Field Values

QUERY_DOAS

public static final String QUERY_DOAS

See Also:

Constant Field Values

Constructor Detail

QueryLexer

public QueryLexer()

Constructor. Register token handlers.

Method Detail

tokens

public Token[] tokens(String exp)
               throws InvalidQueryException

Scan the provided query and generate a token stream to be used by the query parser.

Parameters:

exp - the query expression to scan

Returns:

an array of tokens

Throws:

InvalidQueryException - if the query is invalid

tokens

public Token[] tokens(String exp,
                      Collection<String> ignoreProperties)
               throws InvalidQueryException

Scan the provided query and generate a token stream to be used by the query parser.

Parameters:

exp - the query expression to scan

ignoreProperties - property names which should be ignored

Returns:

an array of tokens

Throws:

InvalidQueryException - if the query is invalid