public class SubviewTag extends UIComponentELTag {
private static final Logger LOGGER = FacesLogger.TAGLIB.getLogger();
// ------------------------------------------------------------ Constructors
public SubviewTag() {
super();
}
// ---------------------------------------------------------- Public Methods
public String getComponentType() {
return "javax.faces.NamingContainer";
}
public String getRendererType() {
return null;
}
// ------------------------------------------------------- Protected Methods
protected UIComponent createVerbatimComponentFromBodyContent() {
UIOutput verbatim = (UIOutput) super.createVerbatimComponentFromBodyContent();
String value = null;
FacesContext ctx = getFacesContext();
Object response = ctx.getExternalContext().getResponse();
// flush out any content above the view tag
Method customFlush =
ReflectionUtils.lookupMethod(
response.getClass(), "flushContentToWrappedResponse", RIConstants.EMPTY_CLASS_ARGS);
Method isBytes =
ReflectionUtils.lookupMethod(response.getClass(), "isBytes", RIConstants.EMPTY_CLASS_ARGS);
Method isChars =
ReflectionUtils.lookupMethod(response.getClass(), "isChars", RIConstants.EMPTY_CLASS_ARGS);
Method resetBuffers =
ReflectionUtils.lookupMethod(
response.getClass(), "resetBuffers", RIConstants.EMPTY_CLASS_ARGS);
Method getChars =
ReflectionUtils.lookupMethod(response.getClass(), "getChars", RIConstants.EMPTY_CLASS_ARGS);
boolean cont = true;
if (isBytes == null) {
cont = false;
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING, "jsf.core.taglib.subviewtag.interweaving_failed_isbytes");
}
}
if (isChars == null) {
cont = false;
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING, "jsf.core.taglib.subviewtag.interweaving_failed_ischars");
}
}
if (resetBuffers == null) {
cont = false;
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING, "jsf.core.taglib.subviewtag.interweaving_failed_resetbuffers");
}
}
if (getChars == null) {
cont = false;
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING, "jsf.core.taglib.subviewtag.interweaving_failed_getchars");
}
}
if (customFlush == null) {
cont = false;
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING, "jsf.core.taglib.viewtag.interweaving_failed");
}
}
if (cont) {
try {
if ((Boolean) isBytes.invoke(response)) {
customFlush.invoke(response);
} else if ((Boolean) isChars.invoke(response)) {
char[] chars = (char[]) getChars.invoke(response);
if (null != chars && 0 < chars.length) {
if (null != verbatim) {
value = (String) verbatim.getValue();
}
verbatim = super.createVerbatimComponent();
if (null != value) {
verbatim.setValue(value + new String(chars));
} else {
verbatim.setValue(new String(chars));
}
}
}
resetBuffers.invoke(response);
} catch (Exception e) {
throw new FacesException("Response interweaving failed!", e);
}
}
return verbatim;
}
public int doEndTag() throws JspException {
int retValue;
getViewTagStack().pop();
retValue = super.doEndTag();
return retValue;
}
public int doStartTag() throws JspException {
int retValue;
retValue = super.doStartTag();
getViewTagStack().push(this);
return retValue;
}
/**
* @return Stack of UIComponentClassicTagBase instances, each of which is a "view" tag. The bottom
* most element on the stack is the ViewTag itself. Subsequent instances are SubviewTag
* instances.
*/
static Stack<UIComponentClassicTagBase> getViewTagStack() {
FacesContext ctx = FacesContext.getCurrentInstance();
//noinspection unchecked
Stack<UIComponentClassicTagBase> result =
(Stack<UIComponentClassicTagBase>)
RequestStateManager.get(ctx, RequestStateManager.VIEWTAG_STACK_ATTR_NAME);
if (result == null) {
result = new Stack<UIComponentClassicTagBase>();
RequestStateManager.set(ctx, RequestStateManager.VIEWTAG_STACK_ATTR_NAME, result);
}
return result;
}
}
public class AttributeHandler extends TagHandlerImpl {
private final Logger LOGGER = FacesLogger.TAGLIB.getLogger();
private static final String[] COMPOSITE_ATTRIBUTE_ATTRIBUTES = {
"required",
"targets",
"targetAttributeName",
"default",
"displayName",
"preferred",
"hidden",
"expert",
"shortDescription",
"method-signature",
"type",
};
private static final PropertyHandlerManager ATTRIBUTE_MANAGER =
PropertyHandlerManager.getInstance(COMPOSITE_ATTRIBUTE_ATTRIBUTES);
private TagAttribute name;
public AttributeHandler(TagConfig config) {
super(config);
this.name = this.getRequiredAttribute("name");
}
public void apply(FaceletContext ctx, UIComponent parent) throws IOException {
// only process if it's been created
if (null == parent
|| (null == (parent = parent.getParent()))
|| !(ComponentHandler.isNew(parent))) {
return;
}
Map<String, Object> attrs = parent.getAttributes();
CompositeComponentBeanInfo componentBeanInfo =
(CompositeComponentBeanInfo) attrs.get(UIComponent.BEANINFO_KEY);
assert (null != componentBeanInfo);
List<PropertyDescriptor> declaredAttributes = componentBeanInfo.getPropertyDescriptorsList();
// Get the value of required the name propertyDescriptor
ValueExpression ve = name.getValueExpression(ctx, String.class);
String strValue = (String) ve.getValue(ctx);
// Search the propertyDescriptors for one for this attribute
for (PropertyDescriptor cur : declaredAttributes) {
if (strValue.endsWith(cur.getName())) {
// If we have a match, no need to waste time
// duplicating and replacing it.
return;
}
}
PropertyDescriptor propertyDescriptor;
try {
propertyDescriptor = new CCAttributePropertyDescriptor(strValue, null, null);
declaredAttributes.add(propertyDescriptor);
} catch (IntrospectionException ex) {
throw new TagException(
tag, "Unable to create property descriptor for property " + strValue, ex);
}
TagAttribute defaultTagAttribute = null;
PropertyHandler defaultHandler = null;
for (TagAttribute tagAttribute : this.tag.getAttributes().getAll()) {
String attributeName = tagAttribute.getLocalName();
if ("default".equals(attributeName)) {
// store the TagAttribute and the PropertyHandler for later
// execution, as the handler for the default-attribute requires,
// that the PropertyHandler for 'type' - if it exists - has been
// applied first.
defaultTagAttribute = tagAttribute;
defaultHandler = ATTRIBUTE_MANAGER.getHandler(ctx, "default");
} else {
PropertyHandler handler = ATTRIBUTE_MANAGER.getHandler(ctx, attributeName);
if (handler != null) {
handler.apply(ctx, attributeName, propertyDescriptor, tagAttribute);
}
}
}
if (defaultHandler != null) {
// If the 'default'-attribute of cc:attribute was set, apply the
// previously stored PropertyHandler (see above) now, as now it is
// guaranteed that if a 'type'-attribute existed, that its handler
// was already applied
try {
defaultHandler.apply(ctx, "default", propertyDescriptor, defaultTagAttribute);
} catch (IllegalArgumentException ex) {
// If the type (according to the type-attribute) can not be
// found, the DefaultPropertyHandler will wrapp the
// ClassNotFoundException into an IllegalArgumentException,
// which is unwrapped into a TagException here.
throw new TagException(
tag, "'type' could not be resolved: " + ex.getCause(), ex.getCause());
}
}
this.nextHandler.apply(ctx, parent);
}
private class CCAttributePropertyDescriptor extends PropertyDescriptor {
public CCAttributePropertyDescriptor(String propertyName, Method readMethod, Method writeMethod)
throws IntrospectionException {
super(propertyName, readMethod, writeMethod);
}
@Override
public Object getValue(String attributeName) {
Object result = super.getValue(attributeName);
if ("type".equals(attributeName)) {
if ((null != result) && !(result instanceof Class)) {
FacesContext context = FacesContext.getCurrentInstance();
ELContext elContext = context.getELContext();
String classStr = (String) ((ValueExpression) result).getValue(elContext);
if (null != classStr) {
try {
result = ReflectionUtil.forName(classStr);
this.setValue(attributeName, result);
} catch (ClassNotFoundException ex) {
classStr = "java.lang." + classStr;
boolean throwException = false;
try {
result = ReflectionUtil.forName(classStr);
this.setValue(attributeName, result);
} catch (ClassNotFoundException ex2) {
throwException = true;
}
if (throwException) {
String message = "Unable to obtain class for " + classStr;
if (LOGGER.isLoggable(Level.INFO)) {
LOGGER.log(Level.INFO, message, ex);
}
throw new TagAttributeException(tag, name, message, ex);
}
}
}
}
}
return result;
}
}
}
/**
* Facelet handler responsible for, building the component tree representation of a composite
* component based on the metadata contained in the composite interface and implementation sections
* of the composite component template.
*/
public class CompositeComponentTagHandler extends ComponentHandler
implements CreateComponentDelegate {
private static final Logger LOGGER = FacesLogger.TAGLIB.getLogger();
private Resource ccResource;
private TagAttribute binding;
// ------------------------------------------------------------ Constructors
CompositeComponentTagHandler(Resource ccResource, ComponentConfig config) {
super(config);
this.ccResource = ccResource;
this.binding = config.getTag().getAttributes().get("binding");
((ComponentTagHandlerDelegateImpl) this.getTagHandlerDelegate())
.setCreateCompositeComponentDelegate(this);
}
// ------------------------------------ Methods from CreateComponentDelegate
public UIComponent createComponent(FaceletContext ctx) {
FacesContext context = ctx.getFacesContext();
UIComponent cc;
// we have to handle the binding here, as Application doesn't
// expose a method to do so with Resource.
if (binding != null) {
ValueExpression ve = binding.getValueExpression(ctx, UIComponent.class);
cc = (UIComponent) ve.getValue(ctx);
if (cc != null && !UIComponent.isCompositeComponent(cc)) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, "jsf.compcomp.binding.eval.non.compcomp", binding.toString());
}
cc = null;
}
if (cc == null) {
cc = context.getApplication().createComponent(context, ccResource);
ve.setValue(ctx, cc);
}
} else {
cc = context.getApplication().createComponent(context, ccResource);
}
setCompositeComponent(context, cc);
return cc;
}
// ------------------------------------------- Methods from ComponentHandler
@Override
public void applyNextHandler(FaceletContext ctx, UIComponent c)
throws IOException, FacesException, ELException {
// attributes need to be applied before any action is taken on
// nested children handlers or the composite component handlers
// as there may be an expression evaluated at tree creation time
// that needs access to these attributes
setAttributes(ctx, c);
// Allow any nested elements that reside inside the markup element
// for this tag to get applied
super.applyNextHandler(ctx, c);
// Apply the facelet for this composite component
applyCompositeComponent(ctx, c);
// Allow any PDL declared attached objects to be retargeted
if (ComponentHandler.isNew(c)) {
FacesContext context = ctx.getFacesContext();
String viewId = context.getViewRoot().getViewId();
// PENDING(rlubke): performance
ViewDeclarationLanguageFactory factory =
(ViewDeclarationLanguageFactory)
FactoryFinder.getFactory(FactoryFinder.VIEW_DECLARATION_LANGUAGE_FACTORY);
ViewDeclarationLanguage vdl = factory.getViewDeclarationLanguage(viewId);
vdl.retargetAttachedObjects(context, c, getAttachedObjectHandlers(c, false));
vdl.retargetMethodExpressions(context, c);
// RELEASE_PENDING This is *ugly*. See my comments in
// ComponentTagHandlerDelegateImpl at the end of the apply()
// method
if (StateContext.getStateContext(context).partialStateSaving(context, viewId)) {
markInitialState(c);
}
}
}
// The value of this string, prepended to this.tagId, is used as a
// key in the FacesContext attributes map, the value for which is
// the UIComponent that formerly was stored in an instance variable called
// cc.
private static final String ccInstanceVariableStandinKey =
CompositeComponentTagHandler.class.getName() + "_";
@Override
public void setCompositeComponent(FacesContext context, UIComponent cc) {
Map contextMap = context.getAttributes();
String key = ccInstanceVariableStandinKey + this.tagId;
if (!contextMap.containsKey(key)) {
contextMap.put(key, cc);
}
}
public UIComponent getCompositeComponent(FacesContext context) {
Map contextMap = context.getAttributes();
String key = ccInstanceVariableStandinKey + this.tagId;
UIComponent result = (UIComponent) contextMap.get(key);
return result;
}
/**
* Specialized implementation to prevent caching of the MetaRuleset when ProjectStage is
* Development.
*/
@Override
public void setAttributes(FaceletContext ctx, Object instance) {
if (instance != null) {
if (ctx.getFacesContext().isProjectStage(ProjectStage.Development)) {
Metadata meta = createMetaRuleset(instance.getClass()).finish();
meta.applyMetadata(ctx, instance);
} else {
super.setAttributes(ctx, instance);
}
}
}
/**
* This is basically a copy of what's define in ComponentTagHandlerDelegateImpl except for the
* MetaRuleset implementation that's being used.
*
* <p>This also allows us to treat composite component's backed by custom component implementation
* classes based on their type.
*
* @param type the <code>Class</code> for which the <code>MetaRuleset</code> must be created.
*/
@Override
protected MetaRuleset createMetaRuleset(Class type) {
Util.notNull("type", type);
FacesContext context = FacesContext.getCurrentInstance();
UIComponent cc = getCompositeComponent(context);
if (null == cc) {
FaceletContext faceletContext =
(FaceletContext) context.getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY);
cc = createComponent(faceletContext);
setCompositeComponent(context, cc);
}
MetaRuleset m =
new CompositeComponentMetaRuleset(
getTag(), type, (BeanInfo) cc.getAttributes().get(UIComponent.BEANINFO_KEY));
// ignore standard component attributes
m.ignore("binding").ignore("id");
m.addRule(CompositeComponentRule.Instance);
// if it's an ActionSource
if (ActionSource.class.isAssignableFrom(type)) {
m.addRule(ActionSourceRule.Instance);
}
// if it's a ValueHolder
if (ValueHolder.class.isAssignableFrom(type)) {
m.addRule(ValueHolderRule.Instance);
// if it's an EditableValueHolder
if (EditableValueHolder.class.isAssignableFrom(type)) {
m.ignore("submittedValue");
m.ignore("valid");
m.addRule(EditableValueHolderRule.Instance);
}
}
// if it's a selectone or selectmany
if (UISelectOne.class.isAssignableFrom(type) || UISelectMany.class.isAssignableFrom(type)) {
m.addRule(RenderPropertyRule.Instance);
}
return m;
}
// ---------------------------------------------------------- Public Methods
public static List<AttachedObjectHandler> getAttachedObjectHandlers(UIComponent component) {
return getAttachedObjectHandlers(component, true);
}
@SuppressWarnings({"unchecked"})
public static List<AttachedObjectHandler> getAttachedObjectHandlers(
UIComponent component, boolean create) {
Map<String, Object> attrs = component.getAttributes();
List<AttachedObjectHandler> result =
(List<AttachedObjectHandler>) attrs.get("javax.faces.RetargetableHandlers");
if (result == null) {
if (create) {
result = new ArrayList<AttachedObjectHandler>();
attrs.put("javax.faces.RetargetableHandlers", result);
} else {
result = Collections.EMPTY_LIST;
}
}
return result;
}
// --------------------------------------------------------- Private Methods
private void applyCompositeComponent(FaceletContext ctx, UIComponent c) throws IOException {
FacesContext facesContext = ctx.getFacesContext();
FaceletFactory factory =
(FaceletFactory) RequestStateManager.get(facesContext, RequestStateManager.FACELET_FACTORY);
VariableMapper orig = ctx.getVariableMapper();
UIPanel facetComponent;
if (ComponentHandler.isNew(c)) {
facetComponent = (UIPanel) facesContext.getApplication().createComponent("javax.faces.Panel");
facetComponent.setRendererType("javax.faces.Group");
c.getFacets().put(UIComponent.COMPOSITE_FACET_NAME, facetComponent);
} else {
facetComponent = (UIPanel) c.getFacets().get(UIComponent.COMPOSITE_FACET_NAME);
}
assert (null != facetComponent);
try {
Facelet f = factory.getFacelet(ccResource.getURL());
VariableMapper wrapper =
new VariableMapperWrapper(orig) {
@Override
public ValueExpression resolveVariable(String variable) {
return super.resolveVariable(variable);
}
};
ctx.setVariableMapper(wrapper);
f.apply(facesContext, facetComponent);
} finally {
ctx.setVariableMapper(orig);
}
}
private void markInitialState(UIComponent c) {
if (!c.initialStateMarked()) {
c.markInitialState();
for (Iterator<UIComponent> i = c.getFacetsAndChildren(); i.hasNext(); ) {
markInitialState(i.next());
}
}
}
// ---------------------------------------------------------- Nested Classes
/**
* Specialized MetaRulesetImpl to return CompositeMetadataTarget for component attribute handling.
*/
private static final class CompositeComponentMetaRuleset extends MetaRulesetImpl {
private BeanInfo compBeanInfo;
private Class<?> type;
public CompositeComponentMetaRuleset(Tag tag, Class<?> type, BeanInfo compBeanInfo) {
super(tag, type);
this.compBeanInfo = compBeanInfo;
this.type = type;
}
@Override
protected MetadataTarget getMetadataTarget() {
try {
return new CompositeMetadataTarget(type, compBeanInfo);
} catch (IntrospectionException ie) {
throw new FacesException(ie);
}
}
// ------------------------------------------------------ Nested Classes
/**
* This class is responsible for creating ValueExpression instances with the expected type based
* off the following:
*
* <p>- if the composite:attribute metadata is present, then use the type if specified by the
* author, or default to Object.class - if no composite:attribute is specified, then attempt to
* return the type based off the bean info for this component
*/
private static final class CompositeMetadataTarget extends MetadataTargetImpl {
private BeanInfo compBeanInfo;
// ---------------------------------------------------- Construcrors
public CompositeMetadataTarget(Class<?> type, BeanInfo compBeanInfo)
throws IntrospectionException {
super(type);
this.compBeanInfo = compBeanInfo;
}
// --------------------------------- Methods from MetadataTargetImpl
@Override
public Class getPropertyType(String name) {
PropertyDescriptor compDescriptor = findDescriptor(name);
if (compDescriptor != null) {
// composite:attribute declaration...
ValueExpression typeVE = (ValueExpression) compDescriptor.getValue("type");
if (typeVE == null) {
return Object.class;
} else {
String className =
(String) typeVE.getValue(FacesContext.getCurrentInstance().getELContext());
if (className != null) {
className = prefix(className);
try {
return ReflectionUtil.forName(className);
} catch (ClassNotFoundException cnfe) {
throw new FacesException(cnfe);
}
} else {
return Object.class;
}
}
} else {
// defer to the default processing which will inspect the
// PropertyDescriptor of the UIComponent type
return super.getPropertyType(name);
}
}
// ------------------------------------------------- Private Methods
private PropertyDescriptor findDescriptor(String name) {
for (PropertyDescriptor pd : compBeanInfo.getPropertyDescriptors()) {
if (pd.getName().equals(name)) {
return pd;
}
}
return null;
}
private String prefix(String className) {
if (className.indexOf('.') == -1 && Character.isUpperCase(className.charAt(0))) {
return ("java.lang." + className);
} else {
return className;
}
}
}
} // END CompositeComponentMetaRuleset
/** <code>MetaRule</code> for populating the ValueExpression map of a composite component. */
private static class CompositeComponentRule extends MetaRule {
private static final CompositeComponentRule Instance = new CompositeComponentRule();
// ------------------------------------------ Methods from ComponentRule
public Metadata applyRule(String name, TagAttribute attribute, MetadataTarget meta) {
if (meta.isTargetInstanceOf(UIComponent.class)) {
Class type = meta.getPropertyType(name);
if (type == null) {
type = Object.class;
}
if (!attribute.isLiteral()) {
return new CompositeExpressionMetadata(name, type, attribute);
} else {
return new LiteralAttributeMetadata(name, type, attribute);
}
}
return null;
}
// ------------------------------------------------------ Nested Classes
/**
* For literal expressions, coerce the literal value to the type as provided to the constructor
* prior to setting the value into the component's attribute map.
*/
private static final class LiteralAttributeMetadata extends Metadata {
private String name;
private Class<?> type;
private TagAttribute attribute;
// ---------------------------------------------------- Constructors
public LiteralAttributeMetadata(String name, Class<?> type, TagAttribute attribute) {
this.name = name;
this.type = type;
this.attribute = attribute;
}
// ------------------------------------------- Methods from Metadata
public void applyMetadata(FaceletContext ctx, Object instance) {
UIComponent c = (UIComponent) instance;
Object value = attribute.getObject(ctx, type);
// don't set the attributes value in the components attributemap
// if it is null, as this will throw a NullPointerException.
if (value != null) {
c.getAttributes().put(name, value);
}
}
} // END LiteralAttributeMetadata
/**
* CompositeExpressionMetadata sets up specialized wrapper ValueExpression instances around the
* source ValueExpression that, when evaluated, will cause the parent composite component of the
* currently available composite component to be pushed onto a stack that the
* ImplicitObjectELResolver will check for.
*/
private static final class CompositeExpressionMetadata extends Metadata {
private String name;
private Class<?> type;
private TagAttribute attr;
// ---------------------------------------------------- Constructors
public CompositeExpressionMetadata(String name, Class<?> type, TagAttribute attr) {
this.name = name;
this.type = type;
this.attr = attr;
}
// ------------------------------------------- Methods from Metadata
public void applyMetadata(FaceletContext ctx, Object instance) {
ValueExpression ve = attr.getValueExpression(ctx, type);
UIComponent cc = (UIComponent) instance;
assert (UIComponent.isCompositeComponent(cc));
Map<String, Object> attrs = cc.getAttributes();
BeanInfo componentMetadata = (BeanInfo) attrs.get(UIComponent.BEANINFO_KEY);
BeanDescriptor desc = componentMetadata.getBeanDescriptor();
Collection<String> attributesWithDeclaredDefaultValues =
(Collection<String>) desc.getValue(RIConstants.ATTRS_WITH_DECLARED_DEFAULT_VALUES);
if (null != attributesWithDeclaredDefaultValues
&& attributesWithDeclaredDefaultValues.contains(name)) {
// It is necessary to remove the value from the attribute
// map because the ELexpression transparancy doesn't know
// about the value's existence.
attrs.remove(name);
}
cc.setValueExpression(name, ve);
}
} // END CompositeExpressionMetadata
} // END CompositeComponentRule
}
