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PART II
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Part II:
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Extending JavaServer Faces
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ELResolver in package javaxel ArrayELResolver BeanELResolver CompositeELResolver ImplicitObjectELResolver ListELResolver MapELResolver ResourceBundleELResolver ScopedAttributeELResolver
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TABLE 13-2
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Description Resolves expression segments that are arrays Resolves JavaBean properties Maintains a chain of nested ELResolvers Resolves the implicit objects from the JSP specification Resolves expression segments that are javautilList instances Resolves expression segments that are javautilMap instances Resolves expression segments that are javautilResourceBundle instances Performs scope search: request, page, session, application
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Usage Example #{useraccounts[0]} #{username} Not Applicable #{cookieuserName} #{useraccounts[0]} #{userpropertyMap} #{bundlekey} #{user}
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ELResolver Instances De ned by the EL 10 Speci cation
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The ELResolvers in Figure 13-1 are defined by the EL specification and the JSF specification Their ordering is defined by the JSF specification The meaning of these resolvers is shown in Tables 13-2 and 13-3
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E XPERT GROUP I NSIGHT The resolvers in Table 13-3 are defined by the JSF 12 specification,
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and no public implementation of these classes is provided This was intentional because the Expert Group didn t want anyone extending the JSF 12 resolvers to allow for maximum flexibility in implementation
Abstract Class to Extend
An ELResolver must extend the abstract class javaxelELResolver and implement the following methods:
public Object getValue(ELContext context, Object base, Object property); public Class getType(ELContext context, Object base, Object property); public void setValue(ELContext context, Object base, Object property, Object value); public boolean isReadOnly(ELContext context, Object base, Object property);
13:
Building Non-UI Custom Components
public Iterator getFeatureDescriptors(ELContext context, Object base); public Class getCommonPropertyType(ELContext context, Object base);
ELResolver from Faces Specification CompositeComponentAttributes ELResolver
Description Resolves expressions that need access to the attributes map of a composite component Resolves only the implicit objects defined by JSF Responsible for instantiating managedbean instances and placing them in the proper scope for future resolution with a scoped attribute ELResolver Responsible for allowing JSF 11 style VariableResolver instances to continue to work Responsible for allowing JSF 11 style PropertyResolver instances to continue to work Allows getting the request path for a resource from the EL Responsible for returning and/or creating a ResourceBundle from information in the facesconfigxml Actual resolution of the key in the bundle happens in the javaxelELResolver Just like the javaxel Scop edAttributeELResolver, but doesn t resolve page scope
Usage Example #{ccattrsloginButtonLabel}
PART II
ImplicitObjectELResolverForFaces ManagedBeanELResolver
#{FacesContext viewRootlocale} #{username}
VariableResolverChainWrapper
#{customImplicitObject value}
PropertyResolverChainWrapper
#{username}
ResourceELResolver
#{resource['trainer:bggif']}
ResourceBundleELResolver
#{bundlename}
ScopedAttributeELResolver
#{username}
TABLE 13-3
ELResolver Instances De ned in the JSF Speci cation
Part II:
Extending JavaServer Faces
Registering an ELResolver
When implementing an ELResolver, you must register it using the el-resolver element in the faces-configxml file The contents of this element must be a fully qualified Java class name of a class that extends ELResolver In JSF 12, the el-resolver element is a child of the application element in the faces-configxml file See 15 for the faces-configxml syntax for registering an ELResolver To illustrate a custom ELResolver, and explain how to implement each of the preceding methods, let s examine the ShaleELResolver from the Shale framework Though the Shale framework is no longer actively developed, it does provide a good example of ELResolver decoration This ELResolver adds the jndi implicit object to the EL For more on Shale, please see http://shaleapacheorg/shale-core/jndi-integrationhtml The ShaleELResolver begins as shown next:
/* * Copyright 2004-2005 The Apache Software Foundation * * License document omitted * */ package orgapacheshalefaces; import javabeansFeatureDescriptor; import javautilArrayList; import javautilIterator; import javaxelELResolver; import javaxelELContext; import javaxelPropertyNotFoundException; import javaxelEvaluationException; import javaxfaceselEvaluationException; import javaxnamingContext; import javaxnamingInitialContext; import javaxnamingName; import javaxnamingNameClassPair; import javaxnamingNameNotFoundException; import javaxnamingNamingEnumeration; import javaxnamingNamingException; /** * <p>Shale-specific ELResolver for evaluating JavaServer Faces * value and method expressions The following special * variable names are recognized, and evaluated as indicated:</p> * <ul> * <li><strong>jndi</strong> - Returns the JNDI context at name * <code>java:comp/env</code> (relative to the initial context * supplied by the container</li> * </ul> * <p>All other evaluations are delegated to <code>ELResolver</code> * chain</p> * */ public class ShaleELResolver extends ELResolver { /** *<p>Construct a new {@link ShaleELResolver} instance</p> * */
13:
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