org.apache.tomcat.util.digester

Class SetNextRule

java.lang.Object

org.apache.tomcat.util.digester.Rule

org.apache.tomcat.util.digester.SetNextRule

public class SetNextRule
extends Rule

Rule implementation that calls a method on the (top-1) (parent) object, passing the top object (child) as an argument. It is commonly used to establish parent-child relationships.

This rule now supports more flexible method matching by default. It is possible that this may break (some) code written against release 1.1.1 or earlier. See isExactMatch() for more details.

Field Summary

Fields

Modifier and Type	Field and Description
protected String	methodName The method name to call on the parent object.
protected String	paramType The Java class name of the parameter type expected by the method.
protected boolean	useExactMatch Should we use exact matching.

Fields inherited from class org.apache.tomcat.util.digester.Rule

digester, namespaceURI

Constructor Summary

Constructors

Constructor and Description
SetNextRule(String methodName, String paramType) Construct a "set next" rule with the specified method name.

Method Summary

Modifier and Type	Method and Description
void	end(String namespace, String name) Process the end of this element.
boolean	isExactMatch() Is exact matching being used.
void	setExactMatch(boolean useExactMatch) Set whether exact matching is enabled.
String	toString() Render a printable version of this Rule.

Methods inherited from class org.apache.tomcat.util.digester.Rule

begin, body, finish, getDigester, getNamespaceURI, setDigester, setNamespaceURI

Methods inherited from class java.lang.Object

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

Field Detail

methodName

protected String methodName

The method name to call on the parent object.

paramType

protected String paramType

The Java class name of the parameter type expected by the method.

useExactMatch

protected boolean useExactMatch

Should we use exact matching. Default is no.

Constructor Detail

SetNextRule

public SetNextRule(String methodName,
                   String paramType)

Construct a "set next" rule with the specified method name.

Parameters:

methodName - Method name of the parent method to call

paramType - Java class of the parent method's argument (if you wish to use a primitive type, specify the corresponding Java wrapper class instead, such as java.lang.Boolean for a boolean parameter)

Method Detail

isExactMatch

public boolean isExactMatch()

Is exact matching being used.

This rule uses org.apache.commons.beanutils.MethodUtils to introspect the relevant objects so that the right method can be called. Originally, MethodUtils.invokeExactMethod was used. This matches methods very strictly and so may not find a matching method when one exists. This is still the behaviour when exact matching is enabled.

When exact matching is disabled, MethodUtils.invokeMethod is used. This method finds more methods but is less precise when there are several methods with correct signatures. So, if you want to choose an exact signature you might need to enable this property.

The default setting is to disable exact matches.

Returns:

true iff exact matching is enabled

Since:

Digester Release 1.1.1

setExactMatch

public void setExactMatch(boolean useExactMatch)

Set whether exact matching is enabled.

See isExactMatch().

Parameters:

useExactMatch - should this rule use exact method matching

Since:

Digester Release 1.1.1

end

public void end(String namespace,
                String name)
         throws Exception

Process the end of this element.

Overrides:

end in class Rule

Parameters:

namespace - the namespace URI of the matching element, or an empty string if the parser is not namespace aware or the element has no namespace

name - the local name if the parser is namespace aware, or just the element name otherwise

Throws:

Exception - if an error occurs while processing the event

toString

public String toString()

Render a printable version of this Rule.

Overrides:

toString in class Object