Package repast.simphony.integration

Class BeanQueryer

java.lang.Object

repast.simphony.integration.BeanQueryer

All Implemented Interfaces:

Queryable

public class BeanQueryer
extends Object
implements Queryable

A queryable that works on Beans using JXPath. This uses the JXPathUtils class to perform the querying, so more information can be found there.

Author:

Jerry Vos

See Also:

• JXPathUtils
• FileDef

Constructor Summary

Constructors

Constructor	Description
BeanQueryer(Object rootObj)	Creates the queryer with the specified object as the root.

Method Summary

Modifier and Type	Method	Description
Object	getRoot()	Returns the root object for this queryer.
Object	getValue(Object o)	Just returns the passed in object since JXPath doesn't have a concept of nodes.
Object	selectNode(Object curContext, String path)	This will create a JXPathContext for the curContext if the curContext Object is not a JXPathContext and will pass that created context in to JXPathUtils.getXPathNode(JXPathContext, JXPathContext, String).
Object	selectNode(String path)	Returns the value of JXPathUtils.getXPathNode(rootContext, null, path)}.

Methods inherited from class java.lang.Object

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

Constructor Details

BeanQueryer

public BeanQueryer(Object rootObj)

Creates the queryer with the specified object as the root. Note this gets wrapped in a FileDef object, so getRoot() returns a FileDef object that returns the passed in rootObj in it's FileDef method.

Parameters:

rootObj - the root object

Method Details

selectNode

public Object selectNode(String path)

Returns the value of JXPathUtils.getXPathNode(rootContext, null, path)}.

Specified by:

selectNode in interface Queryable

Parameters:

path - the XPath string to evaluate

Returns:

either an Object or null

See Also:

• JXPathUtils.getXPathNode(JXPathContext, JXPathContext, String)

selectNode

public Object selectNode(Object curContext,
 String path)

This will create a JXPathContext for the curContext if the curContext Object is not a JXPathContext and will pass that created context in to JXPathUtils.getXPathNode(JXPathContext, JXPathContext, String).

Specified by:

selectNode in interface Queryable

Parameters:

curContext - the current context for evaluation

path - the XPath string to evaluate

Returns:

an object or null.

See Also:

• Queryable.selectNode(String)

selectNodes

public List<?> selectNodes(String path)

Returns a collection of nodes according to JXPathUtils.getXPathNodes(JXPathContext, JXPathContext, String).

Specified by:

selectNodes in interface Queryable

Parameters:

path - the XPath string to evaluate

Returns:

a non-null collection of nodes

selectNodes

public List<?> selectNodes(Object curContext,
 String path)

Returns a collection of nodes according to JXPathUtils.getXPathNodes(JXPathContext, JXPathContext, String). If curContext is not a JXPathContext then this will create one for it and pass it in as the current context to the JXPathUtils method.

Specified by:

selectNodes in interface Queryable

Parameters:

curContext - the current context for evaluation

path - the XPath string to evaluate

Returns:

a non-null collection of nodes

getRoot

public Object getRoot()

Returns the root object for this queryer. This will not be the object passed into the constructor, but will be a FileDef object wrapping that object.

Specified by:

getRoot in interface Queryable

Returns:

the root object of the root context

See Also:

• FileDef

getValue

public Object getValue(Object o)

Just returns the passed in object since JXPath doesn't have a concept of nodes.

Specified by:

getValue in interface Queryable

Parameters:

o - the object to get the value of

Returns:

the passed in object