Examples of org.apache.tapestry.binding.ExpressionBinding

org.apache.tapestry.binding.ExpressionBinding
gnl.org">OGNL library.
Optimization of the Expression
There's a lot of room for optimization here because we can count on some portions of the expression to be effectively static. Note that we type the root object as {@link IComponent}. We have some expectations that certain properties of the root (and properties reachable from the root) will be constant for the lifetime of the binding. For example, components never change thier page or container. This means that certain property prefixes can be optimized:
- page
- container
- components.name
This means that once an ExpressionBinding has been triggered, the {@link #toString()} method may return different values for the rootcomponent and the expression than was originally set.
Identifying Invariants
Most expressions are fully dynamic; they must be resolved each time they are accessed. This can be somewhat inefficient. Tapestry can identify certain paths as invariant:
- A component within the page hierarchy
- An {@link org.apache.tapestry.IAsset} from then assets map (property assets)
- A {@link org.apache.tapestry.IActionListener}from the listener map (property listeners)
- A bean with a {@link org.apache.tapestry.spec.BeanLifecycle#PAGE}lifecycle (property beans)
- A binding (property bindings)
These optimizations have some inherent dangers; they assume that the components have not overidden the specified properties; the last one (concerning helper beans) assumes that the component does inherit from {@link org.apache.tapestry.AbstractComponent}. If this becomes a problem in the future, it may be necessary to have the component itself involved in these determinations. @author Howard Lewis Ship @version $Id: ExpressionBinding.java 243862 2004-03-30 22:40:25Z hlship $ @since 2.2

        String value = spec.getValue();


        // The most common type. 
        // TODO These bindings should be created somehow using the SpecFactory in SpecificationParser
        if (type == BindingType.DYNAMIC)
            return new ExpressionBinding(_resolver, container, value, location);


        // String bindings are new in 2.0.4.  For the momement,
        // we don't even try to cache and share them ... they
        // are most often unique within a page.

View Full Code Here

                    location,
                    null);
        }


        IBinding binding =
            new ExpressionBinding(
                _pageSource.getResourceResolver(),
                _loadComponent,
                expression,
                location);

View Full Code Here

        String value = spec.getValue();


        // The most common type. 
        // TODO These bindings should be created somehow using the SpecFactory in SpecificationParser
        if (type == BindingType.DYNAMIC)
            return new ExpressionBinding(_resolver, container, value, location);


        // String bindings are new in 2.0.4.  For the momement,
        // we don't even try to cache and share them ... they
        // are most often unique within a page.

View Full Code Here

                parameterSpec.getLocation(),
                null);
            
            // if there is no binding for this parameter, bind it to the default value
            if (component.getBinding(name) == null) {
                IBinding binding = new ExpressionBinding(_resolver, component, defaultValue, parameterSpec.getLocation());
                component.setBinding(name, binding);
            }
                
        }
    }

View Full Code Here

        String value = spec.getValue();


        // The most common type. 
        // TODO These bindings should be created somehow using the SpecFactory in SpecificationParser
        if (type == BindingType.DYNAMIC)
            return new ExpressionBinding(_resolver, container, value, location);


        // String bindings are new in 2.0.4.  For the momement,
        // we don't even try to cache and share them ... they
        // are most often unique within a page.

View Full Code Here

        String value = spec.getValue();


        // The most common type. 
        // TODO These bindings should be created somehow using the SpecFactory in SpecificationParser
        if (type == BindingType.DYNAMIC)
            return new ExpressionBinding(_resolver, container, value, location);


        // String bindings are new in 2.0.4.  For the momement,
        // we don't even try to cache and share them ... they
        // are most often unique within a page.

View Full Code Here

                parameterSpec.getLocation(),
                null);
            
            // if there is no binding for this parameter, bind it to the default value
            if (component.getBinding(name) == null) {
                IBinding binding = new ExpressionBinding(_resolver, component, defaultValue, parameterSpec.getLocation());
                component.setBinding(name, binding);
            }
                
        }
    }

View Full Code Here

                    location,
                    null);
        }


        IBinding binding =
            new ExpressionBinding(
                _pageSource.getResourceResolver(),
                _loadComponent,
                expression,
                location);

View Full Code Here

                    location,
                    null);
        }


        IBinding binding =
            new ExpressionBinding(
                _pageSource.getResourceResolver(),
                _loadComponent,
                expression,
                location);

View Full Code Here

0 1

TOP

Related Classes of org.apache.tapestry.binding.ExpressionBinding

ognl.TypeConverter

org.apache.tapestry.BaseComponentTemplateLoader

org.apache.tapestry.pageload.EstablishDefaultParameterValuesVisitor

org.apache.tapestry.pageload.PageLoader

org.apache.tapestry.services.impl.OGNLBindingFactory

org.apache.tapestry.spec.IApplicationSpecification

org.apache.tapestry.spec.IBeanSpecification

org.apache.tapestry.util.StringSplitter

org.apache.tapestry.BindingException

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.