org.gcube.resources.discovery.client.queries.impl
Class XQuery

java.lang.Object
  org.gcube.resources.discovery.client.queries.impl.QueryBox
      org.gcube.resources.discovery.client.queries.impl.QueryTemplate
          org.gcube.resources.discovery.client.queries.impl.XQuery

All Implemented Interfaces:

Query, SimpleQuery

public class XQuery
extends QueryTemplate
implements SimpleQuery

A SimpleQuery over an XQuery template.

The template is defined as follows (cf. template):

<ns/> for $resource in <range/><vars/> where <cond def="$result"/> return <result def="$result"/>

where:

• range stands for the path to the data ranged over by the $result variable. This parameter is typically bound at query-creation time (cf. XQuery(Map).
• ns, vars, cond and result stand for, respectively, the declarations of namespace prefixes, the declarations of auxiliary variables, the conditions, and the result expression of the query. These parameters should be bound through the SimpleQuery API.

Author:

Fabio Simeoni

Field Summary

static String	cond
static String	ns
static String	range
static String	result
static String	template
static String	vars

Fields inherited from class org.gcube.resources.discovery.client.queries.impl.QueryTemplate

DEFAULT

Constructor Summary

XQuery(Map<String,String> parameters)

Method Summary

XQuery	addCondition(String condition) Adds a free-form condition on query results.
XQuery	addNamespace(String prefix, URI uri) Adds a namespace to the query.
XQuery	addVariable(String variable, String range) Adds a variable to the query.
XQuery	setResult(String expression) Adds a result expression to the query.

Methods inherited from class org.gcube.resources.discovery.client.queries.impl.QueryTemplate

addParameter, appendParameter, expression, hasParameter, parameter

Methods inherited from class org.gcube.resources.discovery.client.queries.impl.QueryBox

equals, hashCode, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.gcube.resources.discovery.client.queries.api.Query

expression

Field Detail

ns

public static final String ns

See Also:

Constant Field Values

vars

public static final String vars

See Also:

Constant Field Values

range

public static final String range

See Also:

Constant Field Values

cond

public static final String cond

See Also:

Constant Field Values

result

public static final String result

See Also:

Constant Field Values

template

public static final String template

See Also:

Constant Field Values

Constructor Detail

XQuery

public XQuery(Map<String,String> parameters)

Method Detail

addCondition

public XQuery addCondition(String condition)

Adds a free-form condition on query results.

In the condition, $resource ranges over resources.

Specified by:

addCondition in interface SimpleQuery

Parameters:

condition - the condition

Returns:

the query

addNamespace

public XQuery addNamespace(String prefix,
                           URI uri)

Description copied from interface: SimpleQuery

Adds a namespace to the query.

Specified by:

addNamespace in interface SimpleQuery

Parameters:

prefix - the namespace prefix

uri - the namespace URI

Returns:

the query

addVariable

public XQuery addVariable(String variable,
                          String range)

Description copied from interface: SimpleQuery

Adds a variable to the query.

Specified by:

addVariable in interface SimpleQuery

Parameters:

variable - the name of the variable

range - the range of the variable

Returns:

the query

setResult

public XQuery setResult(String expression)

Adds a result expression to the query.

In the expression, $resource ranges over resources.

Specified by:

setResult in interface SimpleQuery

Parameters:

expression - the result expression

Returns:

the query