constraint_samplers::ConstraintSamplerManager Class Reference

This class assists in the generation of a ConstraintSampler for a particular group from a moveit_msgs::Constraints. More...

#include <constraint_sampler_manager.h>

Public Member Functions
	ConstraintSamplerManager ()
	Empty constructor. More...
void	registerSamplerAllocator (const ConstraintSamplerAllocatorPtr &sa)
	Allows the user to specify an alternate ConstraintSamplerAllocation. More...
ConstraintSamplerPtr	selectSampler (const planning_scene::PlanningSceneConstPtr &scene, const std::string &group_name, const moveit_msgs::Constraints &constr) const
	Selects among the potential sampler allocators. More...

Static Public Member Functions
static ConstraintSamplerPtr	selectDefaultSampler (const planning_scene::PlanningSceneConstPtr &scene, const std::string &group_name, const moveit_msgs::Constraints &constr)
	Default logic to select a ConstraintSampler given a constraints message. More...

Private Attributes
std::vector< ConstraintSamplerAllocatorPtr >	sampler_alloc_
	Holds the constraint sampler allocators, which will be tested in order More...

Detailed Description

This class assists in the generation of a ConstraintSampler for a particular group from a moveit_msgs::Constraints.

It contains logic that will generate either a JointConstraintSampler, an IKConstraintSampler, or a UnionConstraintSampler depending on the contents of the Constraints message and the group in question.

Definition at line 88 of file constraint_sampler_manager.h.

Constructor & Destructor Documentation

ConstraintSamplerManager()

constraint_samplers::ConstraintSamplerManager::ConstraintSamplerManager ( )

inline

Empty constructor.

Definition at line 95 of file constraint_sampler_manager.h.

Member Function Documentation

registerSamplerAllocator()

void constraint_samplers::ConstraintSamplerManager::registerSamplerAllocator ( const ConstraintSamplerAllocatorPtr &  sa )

inline

Allows the user to specify an alternate ConstraintSamplerAllocation.

Parameters

sa	The constraint sampler allocator that will be used

Definition at line 103 of file constraint_sampler_manager.h.

selectDefaultSampler()

constraint_samplers::ConstraintSamplerPtr constraint_samplers::ConstraintSamplerManager::selectDefaultSampler ( const planning_scene::PlanningSceneConstPtr &  scene, const std::string &  group_name, const moveit_msgs::Constraints &  constr  )

static

Default logic to select a ConstraintSampler given a constraints message.

This function will generate a sampler using the joint_constraint, position_constraint, and orientation_constraint vectors from the Constraints argument. The type of constraint sampler that is produced depends on which constraint vectors have been populated. The following rules are applied:

• If every joint in the group indicated by group_name is constrained by a valid joint constraint in the joint_constraints vector, a JointConstraintSampler with all bounded joints in returned.
• If not every joint is constrained, but no position and orientation constraints are specified, or no valid IKConstraintSampler can be created, then a JointConstraintSampler with some unbounded joints is returned.
• If position and orientation constraints are present and there is an IKSolver for the group, the function will attempt to create an IKConstraintSampler.
  • If there are multiple valid position/constraint pairings, the one with the smallest volume will be kept.
  • If no full pose is available, the function will attempt to create a position-only IKConstraintSampler.
  • Finally, the function will attempt to create an orientation-only IKConstraintSampler.
  • If there is a valid IKConstraintSampler, then if no valid joint constraints are present then an IKConstraintSampler will be returned.
  • If there are joint constraints, a UnionConstraintSampler with both the JointConstraintSampler and the IKConstraintSampler will be returned.
• If there is no direct IK solver for the group, or no valid IKConstraintSampler could be generated, and there are subgroup IKSolvers, the function will attempt to generate a sampler from the various subgroup solvers.
  • It will attempt to determine which constraints act on the IK link for the sub-group IK solvers, and attempts to create ConstraintSampler functions by recursively calling selectDefaultSampler for the sub-group.
  • If any samplers are valid, it adds them to a vector of type ConstraintSamplerPtr.
  • Once it has iterated through each sub-group, if any samplers are valid, they are returned in a UnionConstraintSampler, along with a JointConstraintSampler if one exists.

    Parameters

    scene	The planning scene that will be used to create the ConstraintSampler
    group_name	The group name for which to create a sampler
    constr	The set of constraints for which to create a sampler

    Returns

    A valid ConstraintSamplerPtr if one could be allocated, otherwise an empty ConstraintSamplerPtr.

Definition at line 56 of file constraint_sampler_manager.cpp.

selectSampler()

constraint_samplers::ConstraintSamplerPtr constraint_samplers::ConstraintSamplerManager::selectSampler	(	const planning_scene::PlanningSceneConstPtr &	scene,
		const std::string &	group_name,
		const moveit_msgs::Constraints &	constr
	)		const

Selects among the potential sampler allocators.

This function will iterate through the constraint sampler allocators, trying to find one that can service the constraints. The first one that can service the request will be called. If no allocators can service the Constraints, or there are no allocators, the selectDefaultSampler will be called.

Parameters

scene	The planning scene that will be passed into the constraint sampler
group_name	The group name for which to allocate the constraint sampler
constr	The constraints

Returns

An allocated ConstraintSamplerPtr, or an empty pointer if none could be allocated

Definition at line 43 of file constraint_sampler_manager.cpp.

Member Data Documentation

sampler_alloc_

std::vector<ConstraintSamplerAllocatorPtr> constraint_samplers::ConstraintSamplerManager::sampler_alloc_

private

Holds the constraint sampler allocators, which will be tested in order

Definition at line 174 of file constraint_sampler_manager.h.

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The documentation for this class was generated from the following files:

• constraint_sampler_manager.h
• constraint_sampler_manager.cpp