org.apache.commons.digester
Class CallParamRule

java.lang.Object
  extended by org.apache.commons.digester.Rule
      extended by org.apache.commons.digester.CallParamRule

public class CallParamRule
extends Rule

Rule implementation that saves a parameter for use by a surrounding CallMethodRule.

This parameter may be:


Field Summary
protected  String attributeName
          The attribute from which to save the parameter value
protected  Stack<String> bodyTextStack
          Stack is used to allow nested body text to be processed.
protected  boolean fromStack
          Is the parameter to be set from the stack?
protected  int paramIndex
          The zero-relative index of the parameter we are saving.
protected  int stackIndex
          The position of the object from the top of the stack
 
Fields inherited from class org.apache.commons.digester.Rule
digester, namespaceURI
 
Constructor Summary
CallParamRule(Digester digester, int paramIndex)
          Deprecated. The digester instance is now set in the Digester.addRule(java.lang.String, org.apache.commons.digester.Rule) method. Use CallParamRule(int paramIndex) instead.
CallParamRule(Digester digester, int paramIndex, String attributeName)
          Deprecated. The digester instance is now set in the Digester.addRule(java.lang.String, org.apache.commons.digester.Rule) method. Use CallParamRule(int paramIndex, String attributeName) instead.
CallParamRule(int paramIndex)
          Construct a "call parameter" rule that will save the body text of this element as the parameter value.
CallParamRule(int paramIndex, boolean fromStack)
          Construct a "call parameter" rule.
CallParamRule(int paramIndex, int stackIndex)
          Constructs a "call parameter" rule which sets a parameter from the stack.
CallParamRule(int paramIndex, String attributeName)
          Construct a "call parameter" rule that will save the value of the specified attribute as the parameter value.
 
Method Summary
 void begin(Attributes attributes)
          Process the start of this element.
 void body(String bodyText)
          Process the body text of this element.
 void end(String namespace, String name)
          Process any body texts now.
 String toString()
          Render a printable version of this Rule.
 
Methods inherited from class org.apache.commons.digester.Rule
begin, body, end, finish, getDigester, getNamespaceURI, setDigester, setNamespaceURI
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

attributeName

protected String attributeName
The attribute from which to save the parameter value


paramIndex

protected int paramIndex
The zero-relative index of the parameter we are saving.


fromStack

protected boolean fromStack
Is the parameter to be set from the stack?


stackIndex

protected int stackIndex
The position of the object from the top of the stack


bodyTextStack

protected Stack<String> bodyTextStack
Stack is used to allow nested body text to be processed. Lazy creation.

Constructor Detail

CallParamRule

public CallParamRule(Digester digester,
                     int paramIndex)
Deprecated. The digester instance is now set in the Digester.addRule(java.lang.String, org.apache.commons.digester.Rule) method. Use CallParamRule(int paramIndex) instead.

Construct a "call parameter" rule that will save the body text of this element as the parameter value.

Note that if the element is empty the an empty string is passed to the target method, not null. And if automatic type conversion is being applied (ie if the target function takes something other than a string as a parameter) then the conversion will fail if the converter class does not accept an empty string as valid input.

Parameters:
digester - The associated Digester
paramIndex - The zero-relative parameter number

CallParamRule

public CallParamRule(Digester digester,
                     int paramIndex,
                     String attributeName)
Deprecated. The digester instance is now set in the Digester.addRule(java.lang.String, org.apache.commons.digester.Rule) method. Use CallParamRule(int paramIndex, String attributeName) instead.

Construct a "call parameter" rule that will save the value of the specified attribute as the parameter value.

Parameters:
digester - The associated Digester
paramIndex - The zero-relative parameter number
attributeName - The name of the attribute to save

CallParamRule

public CallParamRule(int paramIndex)
Construct a "call parameter" rule that will save the body text of this element as the parameter value.

Note that if the element is empty the an empty string is passed to the target method, not null. And if automatic type conversion is being applied (ie if the target function takes something other than a string as a parameter) then the conversion will fail if the converter class does not accept an empty string as valid input.

Parameters:
paramIndex - The zero-relative parameter number

CallParamRule

public CallParamRule(int paramIndex,
                     String attributeName)
Construct a "call parameter" rule that will save the value of the specified attribute as the parameter value.

Parameters:
paramIndex - The zero-relative parameter number
attributeName - The name of the attribute to save

CallParamRule

public CallParamRule(int paramIndex,
                     boolean fromStack)
Construct a "call parameter" rule.

Parameters:
paramIndex - The zero-relative parameter number
fromStack - should this parameter be taken from the top of the stack?

CallParamRule

public CallParamRule(int paramIndex,
                     int stackIndex)
Constructs a "call parameter" rule which sets a parameter from the stack. If the stack contains too few objects, then the parameter will be set to null.

Parameters:
paramIndex - The zero-relative parameter number
stackIndex - the index of the object which will be passed as a parameter. The zeroth object is the top of the stack, 1 is the next object down and so on.
Method Detail

begin

public void begin(Attributes attributes)
           throws Exception
Process the start of this element.

Overrides:
begin in class Rule
Parameters:
attributes - The attribute list for this element
Throws:
Exception

body

public void body(String bodyText)
          throws Exception
Process the body text of this element.

Overrides:
body in class Rule
Parameters:
bodyText - The body text of this element
Throws:
Exception

end

public void end(String namespace,
                String name)
Process any body texts now.

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

toString

public String toString()
Render a printable version of this Rule.

Overrides:
toString in class Object


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