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package javax.faces.flow.builder;
import javax.el.MethodExpression;
import javax.el.ValueExpression;
import javax.faces.flow.Flow;
/**
* A Java language API for building {@link Flow}s.
* This API is semantically identical to the
* <flow-definition> element in the
* Application
* Configuration Resources XML Schema Definition.
*
*
*
* Usage example:
public class FlowA implements Serializable {
@Produces {@link FlowDefinition}
public {@link Flow} buildMyFlow(@{@link FlowBuilderParameter} {@link FlowBuilder} flowBuilder) {
String flowId = "flow-a";
flowBuilder.id("unique", flowId);
flowBuilder.returnNode("taskFlowReturn1").
fromOutcome("#{flow_a_Bean.returnValue}");
flowBuilder.inboundParameter("param1FromFlowB", "#{flowScope.param1Value}");
flowBuilder.inboundParameter("param2FromFlowB", "#{flowScope.param2Value}");
flowBuilder.flowCallNode("callB").flowReference("", "flow-b").
outboundParameter("param1FromFlowA", "param1Value").
outboundParameter("param2FromFlowA", "param2Value");
return flowBuilder.getFlow();
}
}
*
* The runtime must discover all such methods at startup time and ensure that
* the returned flows are added to the {@link javax.faces.flow.FlowHandler} using
* the {@link javax.faces.flow.FlowHandler#addFlow(javax.faces.context.FacesContext, javax.faces.flow.Flow)} method.
*
*
*
* @since 2.2
*/
public abstract class FlowBuilder {
/**
* Set the defining document id and flow id
* of this flow.
*
* @param definingDocumentId The defining document id of this flow, or the
* empty string if this flow does not need a defining document id.
* @param id the id of the flow
* @throws NullPointerException if any of the parameters are {@code null}
* @since 2.2
*/
public abstract FlowBuilder id(String definingDocumentId, String id);
/**
* Define a view node in a flow graph.
*
* @param viewNodeId Within the flow graph, the id of this view node
* @param vdlDocumentId The fully qualified path to the view node within this flow.
* @throws NullPointerException if any of the parameters are {@code null}
* @since 2.2
*/
/**
* Define a view node in a flow graph.
*
* @param viewNodeId Within the flow graph, the id of this view node. Must
* be unique among all nodes in this flow graph.
* @param vdlDocumentId The fully qualified path to the view node within this flow.
* @throws NullPointerException if any of the parameters are {@code null}
* @since 2.2
*/
public abstract ViewBuilder viewNode(String viewNodeId, String vdlDocumentId);
/**
* Define a particular combination of
* conditions that must match for this case to be executed,
* and the view id of the component tree that should be selected next.
*
* @since 2.2
*/
public abstract NavigationCaseBuilder navigationCase();
/**
* Define a particular list of cases that
* will be inspected in the order they are defined to determine where to
* go next in the flow graph. If none of the cases match, the outcome
* from the default case is chosen.
*
* @param switchNodeId Within the flow graph, the id of this switch node. Must
* be unique among all nodes in this flow graph.
*
* @throws NullPointerException if any of the parameters are {@code null}
*
* @since 2.2
*
*/
public abstract SwitchBuilder switchNode(String switchNodeId);
/**
* Define a return node. This node will cause
* the specified outcome to be returned to the calling flow.
*
* @param returnNodeId Within the flow graph, the id of this return node. Must
* be unique among all nodes in this flow graph.
* @throws NullPointerException if any of the parameters are {@code null}
*
* @since 2.2
*/
public abstract ReturnBuilder returnNode(String returnNodeId);
/**
* Define a method call node. This node will
* cause the specified method to be invoked, passing parameters if necessary.
* The return from the method is used as the outcome for where to go next in the
* flow. If the method is a void method, the default outcome is used.
*
* @param methodCallNodeId Within the flow graph, the id of this method call node. Must
* be unique among all nodes in this flow graph.
* @throws NullPointerException if any of the parameters are {@code null}
*
* @since 2.2
*/
public abstract MethodCallBuilder methodCallNode(String methodCallNodeId);
/**
* Define a flow call node. This node will
* cause the specified flow to be called, passing parameters if necessary.
*
* @param flowCallNodeId Within the flow graph, the id of this return node. Must
* be unique among all nodes in this flow graph.
* @throws NullPointerException if any of the parameters are {@code null}
*
* @since 2.2
*/
public abstract FlowCallBuilder flowCallNode(String flowCallNodeId);
/**
* A MethodExpression that will be invoked when the flow is entered.
*
* @param methodExpression the expression to invoke, must reference a zero-argument method.
* @throws NullPointerException if any of the parameters are {@code null}
*
* @since 2.2
*/
public abstract FlowBuilder initializer(MethodExpression methodExpression);
/**
* A MethodExpression that will be invoked when the flow is entered.
*
* @param methodExpression the expression to invoke, must reference a zero-argument method.
* @throws NullPointerException if any of the parameters are {@code null}
*
* @since 2.2
*/
public abstract FlowBuilder initializer(String methodExpression);
/**
* A MethodExpression that will be invoked when the flow is exited.
*
* @param methodExpression the expression to invoke, must reference a zero-argument method.
* @throws NullPointerException if any of the parameters are {@code null}
*
* @since 2.2
*/
public abstract FlowBuilder finalizer(MethodExpression methodExpression);
/**
* A MethodExpression that will be invoked when the flow is exited.
*
* @param methodExpression the expression to invoke, must reference a zero-argument method.
* @throws NullPointerException if any of the parameters are {@code null}
*
* @since 2.2
*/
public abstract FlowBuilder finalizer(String methodExpression);
/**
* A parameter that will be populated with
* the value from a correspondingly named outbound parameter from another
* flow when this flow is entered from that flow.
*
* @param name the parameter name
*
* @param expression the {@code ValueExpression} to populate with the inbound
* value when the flow is called.
* @throws NullPointerException if any of the parameters are {@code null}
*
* @since 2.2
*/
public abstract FlowBuilder inboundParameter(String name, ValueExpression expression);
/**
* A parameter that will be populated with
* the value from a correspondingly named outbound parameter from another
* flow when this flow is entered from that flow.
*
* @param name the parameter name
*
* @param expression the {@code ValueExpression} String to populate with the inbound
* value when the flow is called.
* @throws NullPointerException if any of the parameters are {@code null}
*
* @since 2.2
*/
public abstract FlowBuilder inboundParameter(String name, String expression);
/**
* Called as the last step in flow definition,
* this method must perform any implementation specific initialization
* and return the built {@link Flow}. If called more than one time during a
* given flow building process, the second and subsequent invocations must
* take no action and return the built flow.
*
* @throws IllegalStateException if the {@link #id} method had not been
* called prior to this method being called.
*
* @since 2.2
*/
public abstract Flow getFlow();
}