Examples of org.jbpm.pvm.VariableScope

org.jbpm.pvm.VariableScope
a scope of variables {@link Execution#getVariableScopeIterator() associated to an execution}.
Users should use the convenience methods on execution
- {@link Execution#getVariable(String)}
- {@link Execution#getVariableKeys()}
- {@link Execution#getVariables()}
- {@link Execution#setVariable(String,Object)}
- {@link Execution#setVariables(Map)}
This interface is created so that process languages can embed their variable scopes in other objects. E.g. by default, the ExecutionImpl class manages a list of VariableScope's. But the execution subclass for individual process languages can overwrite the usage of that member and get the variable scopes from some other member.
@author Tom Baeyens


  /** @see Execution#setVariable(String, Object) */
  public void setVariable(String key, Object value) {
    // first search for the most inner variable scope that has a variable for 
    // the given key
    VariableScope variableScope = findVariableScope(key);
    
    // if no variable scope exists for the given variable
    if (variableScope==null) {
      // then take the most outer scope of the process instance
      List<VariableScope> processInstanceVariableScopes = processInstance.getVariableScopes();
      if ( (processInstanceVariableScopes!=null)
           && (! processInstanceVariableScopes.isEmpty())
         ) {
        int lastIndex = processInstanceVariableScopes.size()-1;
        variableScope = processInstanceVariableScopes.get(lastIndex);


      } else { // means the process instance doesn't have a variable scope yet
        // create the most outer variable scope
        variableScope = processInstance.createVariableScope();
      }
    }
    variableScope.set(key, value);
  }

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      }
    }
  }


  public Object getVariable(String key) {
    VariableScope variableScope = findVariableScope(key);
    if (variableScope!=null) {
      return variableScope.get(key);
    }
    return null;
  }

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  public Set<String> getVariableKeys() {
    Set<String> variableKeys = new HashSet<String>();
    VariableScopeIterator iter = new VariableScopeIterator(this);
    while (iter.hasNext()) {
      VariableScope variableScope = iter.next();
      Set<String> keys = variableScope.keys();
      if (keys!=null) {
        variableKeys.addAll(keys);
      }
    }
    return variableKeys;

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  public Map<String, Object> getVariables() {
    Map<String, Object> allVariables = new HashMap<String, Object>();
    VariableScopeIterator iter = new VariableScopeIterator(this);
    while (iter.hasNext()) {
      VariableScope variableScope = iter.next();
      Map<String, Object> localVariables = variableScope.getAll();
      if (localVariables!=null) {
        for(String key: localVariables.keySet()) {
          if (! allVariables.containsKey(key)) {
            allVariables.put(key, localVariables.get(key));
          }

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    return createVariableScope(null);
  }
  
  public VariableScope createVariableScope(List<VariableDefinition> variableDefinitions) {
    log.finest("creating variable scope on "+this);
    VariableScope variableScope = newVariableScope();
    pushVariableScope(variableScope);
    if (variableDefinitions!=null) {
      for (VariableDefinition variableDefinition: variableDefinitions) {
        String variableName = variableDefinition.getName();
        Object initialValue = variableDefinition.getInitialValue(this);
        variableScope.set(variableName, initialValue);
      }
    }
    return variableScope;
  }

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    return new VariableScopeIterator(this);
  }
  


  public void removeVariable(String key) {
    VariableScope variableScope = findVariableScope(key);
    if (variableScope!=null) {
      variableScope.remove(key);
    }
  }

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  }
  
  // protected variable helper methods ////////////////////////////////////////


  protected VariableScope getVariableScope() {
    VariableScope variableScope = findVariableScope();
    if (variableScope!=null) {
      return variableScope;
    }
    return processInstance.createVariableScope();
  }

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  protected List getScopeListFromExecution() {
    return execution.getVariableScopes();
  }


  protected boolean isWanted(Object executionScope) {
    VariableScope variableScope = (VariableScope) executionScope;
    
    return ( (key==null)
             || (variableScope.has(key))
           );
  }

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Related Classes of org.jbpm.pvm.VariableScope

org.jbpm.pvm.impl.ExecutionImpl

org.jbpm.pvm.impl.VariableScopeIterator

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