org.activiti.engine.impl.el

Class NoExecutionVariableScope

java.lang.Object

org.activiti.engine.impl.el.NoExecutionVariableScope

All Implemented Interfaces:

VariableScope

public class NoExecutionVariableScope
extends Object
implements VariableScope

Variable-scope only used to resolve variables when NO execution is active but expression-resolving is needed. This occurs eg. when start-form properties have default's defined. Even though variables are not available yet, expressions should be resolved anyway.

Author:

Frederik Heremans, Joram Barrez

Constructor Summary

Constructors

Constructor and Description
NoExecutionVariableScope()

Method Summary

Modifier and Type	Method and Description
void	createVariableLocal(String variableName, Object value)
void	createVariablesLocal(Map<String,? extends Object> variables)
static NoExecutionVariableScope	getSharedInstance() Since a NoExecutionVariableScope has no state, it's safe to use the same instance to prevent too many useless instances created.
Object	getTransientVariable(String variableName) Similar to VariableScope.getVariable(String), including the searching via the parent scopes, but for transient variables only.
Object	getTransientVariableLocal(String variableName) Similar to VariableScope.getVariableLocal(String), but for a transient variable.
Map<String,Object>	getTransientVariables() Similar to VariableScope.getVariables(), but for transient variables only.
Map<String,Object>	getTransientVariablesLocal() Similar to VariableScope.getVariableLocal(String), but for transient variables only.
Object	getVariable(String variableName) Returns the variable value for one specific variable.
Object	getVariable(String variableName, boolean fetchAllVariables) Similar to VariableScope.getVariable(String), but has an extra flag that indicates whether or not all variables need to be fetched when getting one variable.
<T> T	getVariable(String variableName, Class<T> variableClass) Typed version of the VariableScope.getVariable(String) method.
VariableInstance	getVariableInstance(String variableName) Similar to VariableScope.getVariable(String), but returns a VariableInstance instance, which contains more information than just the value.
VariableInstance	getVariableInstance(String variableName, boolean fetchAllVariables) Similar to VariableScope.getVariable(String, boolean), but returns an instance of VariableInstance, which has some additional information beyond the value.
VariableInstance	getVariableInstanceLocal(String variableName) Similar to VariableScope.getVariableLocal(String), but returns an instance of VariableInstance, which has some additional information beyond the value.
VariableInstance	getVariableInstanceLocal(String variableName, boolean fetchAllVariables) Similar to VariableScope.getVariableLocal(String, boolean), but returns an instance of VariableInstance, which has some additional information beyond the value.
Map<String,VariableInstance>	getVariableInstances() Returns all variables, as instances of the VariableInstance interface, which gives more information than only the the value (type, execution id, etc.)
Map<String,VariableInstance>	getVariableInstances(Collection<String> variableNames) Similar to VariableScope.getVariableInstances(), but limited to only the variables with the provided names.
Map<String,VariableInstance>	getVariableInstances(Collection<String> variableNames, boolean fetchAllVariables) Similar to VariableScope.getVariables(Collection, boolean) but returns the variables as instances of the VariableInstance interface, which gives more information than only the the value (type, execution id, etc.)
Map<String,VariableInstance>	getVariableInstancesLocal() Returns the variables local to this scope as instances of the VariableInstance interface, which provided additional information about the variable.
Map<String,VariableInstance>	getVariableInstancesLocal(Collection<String> variableNames) Similar to VariableScope.getVariableInstances(Collection), but only for variables local to this scope.
Map<String,VariableInstance>	getVariableInstancesLocal(Collection<String> variableNames, boolean fetchAllVariables) Similar to VariableScope.getVariableInstances(Collection, boolean), but only for variables local to this scope.
Object	getVariableLocal(String variableName) Returns the value for the specific variable and only checks this scope and not any parent scope.
Object	getVariableLocal(String variableName, boolean fetchAllVariables) Similar to VariableScope.getVariableLocal(String), but has an extra flag that indicates whether or not all variables need to be fetched when getting one variable.
<T> T	getVariableLocal(String variableName, Class<T> variableClass) Typed version of the VariableScope.getVariableLocal(String) method.
Set<String>	getVariableNames() Returns all the names of the variables for this scope and all parent scopes.
Set<String>	getVariableNamesLocal() Returns all the names of the variables for this scope (no parent scopes).
Map<String,Object>	getVariables() Returns all variables.
Map<String,Object>	getVariables(Collection<String> variableNames) Similar to VariableScope.getVariables(), but limited to only the variables with the provided names.
Map<String,Object>	getVariables(Collection<String> variableNames, boolean fetchAllVariables) Similar to #getVariables(Collection)), but with a flag that indicates that all variables should be fetched when fetching the specific variables.
Map<String,Object>	getVariablesLocal() Returns the variable local to this scope only.
Map<String,Object>	getVariablesLocal(Collection<String> variableNames) Similar to VariableScope.getVariables(Collection), but only for variables local to this scope.
Map<String,Object>	getVariablesLocal(Collection<String> variableNames, boolean fetchAllVariables) Similar to VariableScope.getVariables(Collection, boolean), but only for variables local to this scope.
boolean	hasVariable(String variableName) Returns whether this scope or any parent scope has a specific variable.
boolean	hasVariableLocal(String variableName) Returns whether this scope has a specific variable.
boolean	hasVariables() Returns whether this scope or any parent scope has variables.
boolean	hasVariablesLocal() Returns whether this scope has variables.
void	removeTransientVariable(String variableName) Removes a specific transient variable.
void	removeTransientVariableLocal(String variableName) Removes a specific transient variable (also searching parent scopes).
void	removeTransientVariables() Remove all transient variable of this scope and its parent scopes.
void	removeTransientVariablesLocal() Removes all local transient variables.
void	removeVariable(String variableName) Removes the variable and creates a new;@link HistoricVariableUpdateEntity}
void	removeVariableLocal(String variableName) Removes the local variable and creates a new HistoricVariableUpdate.
void	removeVariables() Removes the (local) variables and creates a new HistoricVariableUpdate for each of them.
void	removeVariables(Collection<String> variableNames) Removes the variables and creates a new HistoricVariableUpdate for each of them.
void	removeVariablesLocal() Removes the (local) variables and creates a new HistoricVariableUpdate for each of them.
void	removeVariablesLocal(Collection<String> variableNames) Removes the local variables and creates a new HistoricVariableUpdate for each of them.
void	setTransientVariable(String variableName, Object variableValue) Similar to VariableScope.setVariable(String, Object), but the variable is transient: - no history is kept for the variable - the variable is only available until a waitstate is reached in the process - transient variables 'shadow' persistent variable (when getVariable('abc') where 'abc' is both persistent and transient, the transient value is returned.
void	setTransientVariableLocal(String variableName, Object variableValue) Similar to VariableScope.setVariableLocal(String, Object), but for a transient variable.
void	setTransientVariables(Map<String,Object> transientVariables) Similar to VariableScope.setVariables(Map), but for transient variables.
void	setTransientVariablesLocal(Map<String,Object> transientVariables) Similar to VariableScope.setVariablesLocal(Map), but for transient variables.
void	setVariable(String variableName, Object value) Sets the variable with the provided name to the provided value.
void	setVariable(String variableName, Object value, boolean fetchAllVariables) Similar to VariableScope.setVariable(String, Object), but with an extra flag to indicate whether all variables should be fetched while doing this or not.
Object	setVariableLocal(String variableName, Object value) Similar to VariableScope.setVariable(String, Object), but the variable is set to this scope specifically.
Object	setVariableLocal(String variableName, Object value, boolean fetchAllVariables) Similar to VariableScope.setVariableLocal(String, Object, boolean), but the variable is set to this scope specifically.
void	setVariables(Map<String,? extends Object> variables) Sets the provided variables to the variable scope.
void	setVariablesLocal(Map<String,? extends Object> variables) Similar to VariableScope.setVariables(Map), but the variable are set on this scope specifically.

Methods inherited from class java.lang.Object

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

Constructor Detail

NoExecutionVariableScope

public NoExecutionVariableScope()

Method Detail

getSharedInstance

public static NoExecutionVariableScope getSharedInstance()

Since a NoExecutionVariableScope has no state, it's safe to use the same instance to prevent too many useless instances created.

getVariables

public Map<String,Object> getVariables()

Description copied from interface: VariableScope

Returns all variables. This will include all variables of parent scopes too.

Specified by:

getVariables in interface VariableScope

getVariablesLocal

public Map<String,Object> getVariablesLocal()

Description copied from interface: VariableScope

Returns the variable local to this scope only. So, in contrary to VariableScope.getVariables(), the variables from the parent scope won't be returned.

Specified by:

getVariablesLocal in interface VariableScope

getVariables

public Map<String,Object> getVariables(Collection<String> variableNames)

Description copied from interface: VariableScope

Similar to VariableScope.getVariables(), but limited to only the variables with the provided names.

Specified by:

getVariables in interface VariableScope

getVariables

public Map<String,Object> getVariables(Collection<String> variableNames,
                                       boolean fetchAllVariables)

Description copied from interface: VariableScope

Similar to #getVariables(Collection)), but with a flag that indicates that all variables should be fetched when fetching the specific variables. If set to false, only the specific variables will be fetched. Dependening on the use case, this can be better for performance, as it avoids fetching and processing the other variables. However, if the other variables are needed further on, getting them in one go is probably better (and the variables are cached during one Command execution).

Specified by:

getVariables in interface VariableScope

getVariablesLocal

public Map<String,Object> getVariablesLocal(Collection<String> variableNames)

Description copied from interface: VariableScope

Similar to VariableScope.getVariables(Collection), but only for variables local to this scope.

Specified by:

getVariablesLocal in interface VariableScope

getVariablesLocal

public Map<String,Object> getVariablesLocal(Collection<String> variableNames,
                                            boolean fetchAllVariables)

Description copied from interface: VariableScope

Similar to VariableScope.getVariables(Collection, boolean), but only for variables local to this scope.

Specified by:

getVariablesLocal in interface VariableScope

getVariable

public Object getVariable(String variableName)

Description copied from interface: VariableScope

Returns the variable value for one specific variable. Will look in parent scopes when the variable does not exist on this particular scope.

Specified by:

getVariable in interface VariableScope

getVariable

public Object getVariable(String variableName,
                          boolean fetchAllVariables)

Description copied from interface: VariableScope

Similar to VariableScope.getVariable(String), but has an extra flag that indicates whether or not all variables need to be fetched when getting one variable. By default true (for backwards compatibility reasons), which means that calling VariableScope.getVariable(String) will fetch all variables, of the current scope and all parent scopes. Setting this flag to false can thus be better for performance. However, variables are cached, and if other variables are used later on, setting this true might actually be better for performance.

Specified by:

getVariable in interface VariableScope

getVariableLocal

public Object getVariableLocal(String variableName)

Description copied from interface: VariableScope

Returns the value for the specific variable and only checks this scope and not any parent scope.

Specified by:

getVariableLocal in interface VariableScope

getVariableLocal

public Object getVariableLocal(String variableName,
                               boolean fetchAllVariables)

Description copied from interface: VariableScope

Similar to VariableScope.getVariableLocal(String), but has an extra flag that indicates whether or not all variables need to be fetched when getting one variable. By default true (for backwards compatibility reasons), which means that calling VariableScope.getVariableLocal(String) will fetch all variables, of the current scope. Setting this flag to false can thus be better for performance. However, variables are cached, and if other variables are used later on, setting this true might actually be better for performance.

Specified by:

getVariableLocal in interface VariableScope

getVariable

public <T> T getVariable(String variableName,
                         Class<T> variableClass)

Description copied from interface: VariableScope

Typed version of the VariableScope.getVariable(String) method.

Specified by:

getVariable in interface VariableScope

getVariableLocal

public <T> T getVariableLocal(String variableName,
                              Class<T> variableClass)

Description copied from interface: VariableScope

Typed version of the VariableScope.getVariableLocal(String) method.

Specified by:

getVariableLocal in interface VariableScope

getVariableInstances

public Map<String,VariableInstance> getVariableInstances()

Description copied from interface: VariableScope

Returns all variables, as instances of the VariableInstance interface, which gives more information than only the the value (type, execution id, etc.)

Specified by:

getVariableInstances in interface VariableScope

getVariableInstances

public Map<String,VariableInstance> getVariableInstances(Collection<String> variableNames)

Description copied from interface: VariableScope

Similar to VariableScope.getVariableInstances(), but limited to only the variables with the provided names.

Specified by:

getVariableInstances in interface VariableScope

getVariableInstances

public Map<String,VariableInstance> getVariableInstances(Collection<String> variableNames,
                                                         boolean fetchAllVariables)

Description copied from interface: VariableScope

Similar to VariableScope.getVariables(Collection, boolean) but returns the variables as instances of the VariableInstance interface, which gives more information than only the the value (type, execution id, etc.)

Specified by:

getVariableInstances in interface VariableScope

getVariableInstancesLocal

public Map<String,VariableInstance> getVariableInstancesLocal()

Description copied from interface: VariableScope

Returns the variables local to this scope as instances of the VariableInstance interface, which provided additional information about the variable.

Specified by:

getVariableInstancesLocal in interface VariableScope

getVariableInstancesLocal

public Map<String,VariableInstance> getVariableInstancesLocal(Collection<String> variableNames)

Description copied from interface: VariableScope

Similar to VariableScope.getVariableInstances(Collection), but only for variables local to this scope.

Specified by:

getVariableInstancesLocal in interface VariableScope

getVariableInstancesLocal

public Map<String,VariableInstance> getVariableInstancesLocal(Collection<String> variableNames,
                                                              boolean fetchAllVariables)

Description copied from interface: VariableScope

Similar to VariableScope.getVariableInstances(Collection, boolean), but only for variables local to this scope.

Specified by:

getVariableInstancesLocal in interface VariableScope

getVariableInstance

public VariableInstance getVariableInstance(String variableName)

Description copied from interface: VariableScope

Similar to VariableScope.getVariable(String), but returns a VariableInstance instance, which contains more information than just the value.

Specified by:

getVariableInstance in interface VariableScope

getVariableInstance

public VariableInstance getVariableInstance(String variableName,
                                            boolean fetchAllVariables)

Description copied from interface: VariableScope

Similar to VariableScope.getVariable(String, boolean), but returns an instance of VariableInstance, which has some additional information beyond the value.

Specified by:

getVariableInstance in interface VariableScope

getVariableInstanceLocal

public VariableInstance getVariableInstanceLocal(String variableName)

Description copied from interface: VariableScope

Similar to VariableScope.getVariableLocal(String), but returns an instance of VariableInstance, which has some additional information beyond the value.

Specified by:

getVariableInstanceLocal in interface VariableScope

getVariableInstanceLocal

public VariableInstance getVariableInstanceLocal(String variableName,
                                                 boolean fetchAllVariables)

Description copied from interface: VariableScope

Similar to VariableScope.getVariableLocal(String, boolean), but returns an instance of VariableInstance, which has some additional information beyond the value.

Specified by:

getVariableInstanceLocal in interface VariableScope

getVariableNames

public Set<String> getVariableNames()

Description copied from interface: VariableScope

Returns all the names of the variables for this scope and all parent scopes.

Specified by:

getVariableNames in interface VariableScope

getVariableNamesLocal

public Set<String> getVariableNamesLocal()

Description copied from interface: VariableScope

Returns all the names of the variables for this scope (no parent scopes).

Specified by:

getVariableNamesLocal in interface VariableScope

setVariable

public void setVariable(String variableName,
                        Object value)

Description copied from interface: VariableScope

Sets the variable with the provided name to the provided value.

A variable is set according to the following algorithm:

If this scope already contains a variable by the provided name as a local variable, its value is overwritten to the provided value. If this scope does not contain a variable by the provided name as a local variable, the variable is set to this scope's parent scope, if there is one. If there is no parent scope (meaning this scope is the root scope of the hierarchy it belongs to), this scope is used. This applies recursively up the parent scope chain until, if no scope contains a local variable by the provided name, ultimately the root scope is reached and the variable value is set on that scope.

In practice for most cases, this algorithm will set variables to the scope of the execution at the process instance’s root level, if there is no execution-local variable by the provided name.

Specified by:

setVariable in interface VariableScope

Parameters:

variableName - the name of the variable to be set

value - the value of the variable to be set

setVariable

public void setVariable(String variableName,
                        Object value,
                        boolean fetchAllVariables)

Description copied from interface: VariableScope

Similar to VariableScope.setVariable(String, Object), but with an extra flag to indicate whether all variables should be fetched while doing this or not. The variable will be put on the highest possible scope. For an execution this is the process instance execution. If this is not wanted, use the VariableScope.setVariableLocal(String, Object) method instead. The default (e.g. when calling VariableScope.setVariable(String, Object)), is true, for backwards compatibility reasons. However, in some use cases, it might make sense not to fetch any other variables when setting one variable (for example when doing nothing more than just setting one variable).

Specified by:

setVariable in interface VariableScope

setVariableLocal

public Object setVariableLocal(String variableName,
                               Object value)

Description copied from interface: VariableScope

Similar to VariableScope.setVariable(String, Object), but the variable is set to this scope specifically.

Specified by:

setVariableLocal in interface VariableScope

setVariableLocal

public Object setVariableLocal(String variableName,
                               Object value,
                               boolean fetchAllVariables)

Description copied from interface: VariableScope

Similar to VariableScope.setVariableLocal(String, Object, boolean), but the variable is set to this scope specifically.

Specified by:

setVariableLocal in interface VariableScope

setVariables

public void setVariables(Map<String,? extends Object> variables)

Description copied from interface: VariableScope

Sets the provided variables to the variable scope.

Variables are set according algorithm for VariableScope.setVariable(String, Object), applied separately to each variable.

Specified by:

setVariables in interface VariableScope

Parameters:

variables - a map of keys and values for the variables to be set

setVariablesLocal

public void setVariablesLocal(Map<String,? extends Object> variables)

Description copied from interface: VariableScope

Similar to VariableScope.setVariables(Map), but the variable are set on this scope specifically.

Specified by:

setVariablesLocal in interface VariableScope

hasVariables

public boolean hasVariables()

Description copied from interface: VariableScope

Returns whether this scope or any parent scope has variables.

Specified by:

hasVariables in interface VariableScope

hasVariablesLocal

public boolean hasVariablesLocal()

Description copied from interface: VariableScope

Returns whether this scope has variables.

Specified by:

hasVariablesLocal in interface VariableScope

hasVariable

public boolean hasVariable(String variableName)

Description copied from interface: VariableScope

Returns whether this scope or any parent scope has a specific variable.

Specified by:

hasVariable in interface VariableScope

hasVariableLocal

public boolean hasVariableLocal(String variableName)

Description copied from interface: VariableScope

Returns whether this scope has a specific variable.

Specified by:

hasVariableLocal in interface VariableScope

createVariableLocal

public void createVariableLocal(String variableName,
                                Object value)

createVariablesLocal

public void createVariablesLocal(Map<String,? extends Object> variables)

removeVariable

public void removeVariable(String variableName)

Description copied from interface: VariableScope

Removes the variable and creates a new;@link HistoricVariableUpdateEntity}

Specified by:

removeVariable in interface VariableScope

removeVariableLocal

public void removeVariableLocal(String variableName)

Description copied from interface: VariableScope

Removes the local variable and creates a new HistoricVariableUpdate.

Specified by:

removeVariableLocal in interface VariableScope

removeVariables

public void removeVariables()

Description copied from interface: VariableScope

Removes the (local) variables and creates a new HistoricVariableUpdate for each of them.

Specified by:

removeVariables in interface VariableScope

removeVariablesLocal

public void removeVariablesLocal()

Description copied from interface: VariableScope

Removes the (local) variables and creates a new HistoricVariableUpdate for each of them.

Specified by:

removeVariablesLocal in interface VariableScope

removeVariables

public void removeVariables(Collection<String> variableNames)

Description copied from interface: VariableScope

Removes the variables and creates a new HistoricVariableUpdate for each of them.

Specified by:

removeVariables in interface VariableScope

removeVariablesLocal

public void removeVariablesLocal(Collection<String> variableNames)

Description copied from interface: VariableScope

Removes the local variables and creates a new HistoricVariableUpdate for each of them.

Specified by:

removeVariablesLocal in interface VariableScope

setTransientVariablesLocal

public void setTransientVariablesLocal(Map<String,Object> transientVariables)

Description copied from interface: VariableScope

Similar to VariableScope.setVariablesLocal(Map), but for transient variables. See VariableScope.setTransientVariable(String, Object) for the rules on 'transient' variables.

Specified by:

setTransientVariablesLocal in interface VariableScope

setTransientVariableLocal

public void setTransientVariableLocal(String variableName,
                                      Object variableValue)

Description copied from interface: VariableScope

Similar to VariableScope.setVariableLocal(String, Object), but for a transient variable. See VariableScope.setTransientVariable(String, Object) for the rules on 'transient' variables.

Specified by:

setTransientVariableLocal in interface VariableScope

setTransientVariables

public void setTransientVariables(Map<String,Object> transientVariables)

Description copied from interface: VariableScope

Similar to VariableScope.setVariables(Map), but for transient variables. See VariableScope.setTransientVariable(String, Object) for the rules on 'transient' variables.

Specified by:

setTransientVariables in interface VariableScope

setTransientVariable

public void setTransientVariable(String variableName,
                                 Object variableValue)

Description copied from interface: VariableScope

Similar to VariableScope.setVariable(String, Object), but the variable is transient: - no history is kept for the variable - the variable is only available until a waitstate is reached in the process - transient variables 'shadow' persistent variable (when getVariable('abc') where 'abc' is both persistent and transient, the transient value is returned.

Specified by:

setTransientVariable in interface VariableScope

getTransientVariableLocal

public Object getTransientVariableLocal(String variableName)

Description copied from interface: VariableScope

Similar to VariableScope.getVariableLocal(String), but for a transient variable. See VariableScope.setTransientVariable(String, Object) for the rules on 'transient' variables.

Specified by:

getTransientVariableLocal in interface VariableScope

getTransientVariablesLocal

public Map<String,Object> getTransientVariablesLocal()

Description copied from interface: VariableScope

Similar to VariableScope.getVariableLocal(String), but for transient variables only. See VariableScope.setTransientVariable(String, Object) for the rules on 'transient' variables.

Specified by:

getTransientVariablesLocal in interface VariableScope

getTransientVariable

public Object getTransientVariable(String variableName)

Description copied from interface: VariableScope

Similar to VariableScope.getVariable(String), including the searching via the parent scopes, but for transient variables only. See VariableScope.setTransientVariable(String, Object) for the rules on 'transient' variables.

Specified by:

getTransientVariable in interface VariableScope

getTransientVariables

public Map<String,Object> getTransientVariables()

Description copied from interface: VariableScope

Similar to VariableScope.getVariables(), but for transient variables only. See VariableScope.setTransientVariable(String, Object) for the rules on 'transient' variables.

Specified by:

getTransientVariables in interface VariableScope

removeTransientVariableLocal

public void removeTransientVariableLocal(String variableName)

Description copied from interface: VariableScope

Removes a specific transient variable (also searching parent scopes). See VariableScope.setTransientVariable(String, Object) for the rules on 'transient' variables.

Specified by:

removeTransientVariableLocal in interface VariableScope

removeTransientVariablesLocal

public void removeTransientVariablesLocal()

Description copied from interface: VariableScope

Removes all local transient variables. See VariableScope.setTransientVariable(String, Object) for the rules on 'transient' variables.

Specified by:

removeTransientVariablesLocal in interface VariableScope

removeTransientVariable

public void removeTransientVariable(String variableName)

Description copied from interface: VariableScope

Removes a specific transient variable. See VariableScope.setTransientVariable(String, Object) for the rules on 'transient' variables.

Specified by:

removeTransientVariable in interface VariableScope

removeTransientVariables

public void removeTransientVariables()

Description copied from interface: VariableScope

Remove all transient variable of this scope and its parent scopes. See VariableScope.setTransientVariable(String, Object) for the rules on 'transient' variables.

Specified by:

removeTransientVariables in interface VariableScope