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package com.sun.jdi.request;

import com.sun.jdi.*;


Request for notification when a step occurs in the target VM. When an enabled StepRequest is satisfied, an event set containing a StepEvent will be placed on the EventQueue. The collection of existing StepRequests is managed by the EventRequestManager 
Author:Robert Field
See Also:
Since: 1.3
/**
 * Request for notification when a step occurs in the target VM.
 * When an enabled StepRequest is satisfied, an
 * {@link com.sun.jdi.event.EventSet event set} containing a
 * {@link com.sun.jdi.event.StepEvent StepEvent} will be placed on the
 * {@link com.sun.jdi.event.EventQueue EventQueue}.
 * The collection of existing StepRequests is
 * managed by the {@link EventRequestManager}
 *
 * @see com.sun.jdi.event.StepEvent
 * @see com.sun.jdi.event.EventQueue
 * @see EventRequestManager
 *
 * @author Robert Field
 * @since  1.3
 */
public interface StepRequest extends EventRequest {

    
Step into any newly pushed frames 
/** Step into any newly pushed frames */
    int STEP_INTO = 1;
    
Step over any newly pushed frames 
/** Step over any newly pushed frames */
    int STEP_OVER = 2;
    
Step out of the current frame 
/** Step out of the current frame */
    int STEP_OUT = 3;

    
Step to the next available location 
/** Step to the next available location */
    int STEP_MIN = -1;
    
Step to the next location on a different line 
/** Step to the next location on a different line */
    int STEP_LINE = -2;

    
Returns:the thread on which the step event is being requested.
/**
     * @return the thread on which the step event is being requested.
     */
    ThreadReference thread();

    
Returns:the step size
/**
     * @return the step size
     */
    int size();

    
Returns:the step depth
/**
     * @return the step depth
     */
    int depth();

    
Restricts the events generated by this request to those whose
location is in the given reference type or any of its subtypes.
An event will be generated for any location in a reference type
that can be safely cast to the given reference type.

Params:
  • refType – the reference type to filter on.
Throws:
/**
     * Restricts the events generated by this request to those whose
     * location is in the given reference type or any of its subtypes.
     * An event will be generated for any location in a reference type
     * that can be safely cast to the given reference type.
     *
     * @param refType the reference type to filter on.
     * @throws InvalidRequestStateException if this request is currently
     * enabled or has been deleted.
     * Filters may be added only to disabled requests.
     */
    void addClassFilter(ReferenceType refType);

    
Restricts the events generated by this request to those
whose location is in a class whose name matches a restricted
regular expression. Regular expressions are limited
to exact matches and patterns that begin with '*' or end with '*';
for example, "*.Foo" or "java.*".

Params:
  • classPattern – the pattern String to filter for.
Throws:
/**
     * Restricts the events generated by this request to those
     * whose location is in a class whose name matches a restricted
     * regular expression. Regular expressions are limited
     * to exact matches and patterns that begin with '*' or end with '*';
     * for example, "*.Foo" or "java.*".
     *
     * @param classPattern the pattern String to filter for.
     * @throws InvalidRequestStateException if this request is currently
     * enabled or has been deleted.
     * Filters may be added only to disabled requests.
     */
    void addClassFilter(String classPattern);

    
Restricts the events generated by this request to those
whose location is in a class whose name does not match a
restricted regular expression. Regular expressions are limited
to exact matches and patterns that begin with '*' or end with '*';
for example, "*.Foo" or "java.*".

Params:
  • classPattern – the pattern String to filter against.
Throws:
/**
     * Restricts the events generated by this request to those
     * whose location is in a class whose name does <b>not</b> match a
     * restricted regular expression. Regular expressions are limited
     * to exact matches and patterns that begin with '*' or end with '*';
     * for example, "*.Foo" or "java.*".
     *
     * @param classPattern the pattern String to filter against.
     * @throws InvalidRequestStateException if this request is currently
     * enabled or has been deleted.
     * Filters may be added only to disabled requests.
     */
    void addClassExclusionFilter(String classPattern);

    
Restricts the events generated by this request to those in
which the currently executing instance ("this") is the object
specified.

 Not all targets support this operation. Use VirtualMachine.canUseInstanceFilters() to determine if the operation is supported. 
Params:
  • instance – the object which must be the current instance
in order to pass this filter.
Throws:
Since:1.4
/**
     * Restricts the events generated by this request to those in
     * which the currently executing instance ("this") is the object
     * specified.
     * <P>
     * Not all targets support this operation.
     * Use {@link VirtualMachine#canUseInstanceFilters()}
     * to determine if the operation is supported.
     * @since 1.4
     * @param instance the object which must be the current instance
     * in order to pass this filter.
     * @throws java.lang.UnsupportedOperationException if
     * the target virtual machine does not support this
     * operation.
     * @throws InvalidRequestStateException if this request is currently
     * enabled or has been deleted.
     * Filters may be added only to disabled requests.
     */
    void addInstanceFilter(ObjectReference instance);
}