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package com.sun.faces.facelets.tag;
import com.sun.faces.facelets.compiler.CompilationMessageHolder;
import com.sun.faces.facelets.tag.jsf.CompositeComponentTagLibrary;
import com.sun.faces.facelets.tag.jsf.FacesComponentTagLibrary;
import com.sun.faces.facelets.tag.jsf.LazyTagLibrary;
import com.sun.faces.util.Util;
import javax.faces.FacesException;
import javax.faces.application.FacesMessage;
import javax.faces.application.ProjectStage;
import javax.faces.context.FacesContext;
import javax.faces.view.facelets.Tag;
import javax.faces.view.facelets.TagConfig;
import javax.faces.view.facelets.TagHandler;
import java.lang.reflect.Method;
import java.util.List;
/**
* A TagLibrary that is composed of 1 or more TagLibrary children. Uses the
* chain of responsibility pattern to stop searching as soon as one of the
* children handles the requested method.
*
* @author Jacob Hookom
* @version $Id$
*/
public final class CompositeTagLibrary implements TagLibrary {
private TagLibrary[] libraries;
private CompilationMessageHolder messageHolder;
public CompositeTagLibrary(TagLibrary[] libraries, CompilationMessageHolder unit) {
Util.notNull("libraries", libraries);
this.libraries = libraries;
this.messageHolder = unit;
}
public CompositeTagLibrary(TagLibrary[] libraries) {
this(libraries, null);
}
/*
* (non-Javadoc)
*
* @see com.sun.facelets.tag.TagLibrary#containsNamespace(java.lang.String)
*/
public boolean containsNamespace(String ns, Tag t) {
boolean result = true;
for (int i = 0; i < this.libraries.length; i++) {
if (this.libraries[i].containsNamespace(ns, null)) {
return true;
}
}
// PENDING: this is a terribly inefficient impl. Needs refactoring.
LazyTagLibrary lazyLibraries [] = new LazyTagLibrary[2];
lazyLibraries[0] = new CompositeComponentTagLibrary(ns);
lazyLibraries[1] = new FacesComponentTagLibrary(ns);
LazyTagLibrary toTest = null;
for (int i = 0; i < lazyLibraries.length; i++) {
if (lazyLibraries[i].tagLibraryForNSExists(ns)) {
toTest = lazyLibraries[i];
break;
}
}
if (null != toTest) {
TagLibrary [] librariesPlusOne = new TagLibrary[libraries.length+1];
System.arraycopy(this.libraries, 0, librariesPlusOne,
0, libraries.length);
librariesPlusOne[libraries.length] = toTest;
for (int i = 0; i < this.libraries.length; i++) {
libraries[i] = null;
}
libraries = librariesPlusOne;
return true;
}
else {
FacesContext context = FacesContext.getCurrentInstance();
if (context.isProjectStage(ProjectStage.Development)) {
if (null != t &&
!ns.equals("http://www.w3.org/1999/xhtml")) {
// messageHolder will only be null in the case of the private
// EMPTY_LIBRARY class variable of the Compiler class.
// This code will never be called on that CompositeTagLibrary
// instance.
assert(null != this.messageHolder);
String prefix = getPrefixFromTag(t);
if (null != prefix) {
List<FacesMessage> prefixMessages = this.messageHolder.getNamespacePrefixMessages(context, prefix);
prefixMessages.add(new FacesMessage(FacesMessage.SEVERITY_WARN,
"Warning: This page calls for XML namespace " + ns +
" declared with prefix " + prefix +
" but no taglibrary exists for that namespace.", ""));
}
}
}
}
return false;
}
private String getPrefixFromTag(Tag t) {
String result = t.getQName();
if (null != result) {
int i;
if (-1 != (i = result.indexOf(":"))) {
result = result.substring(0, i);
}
}
return result;
}
/*
* (non-Javadoc)
*
* @see com.sun.facelets.tag.TagLibrary#containsTagHandler(java.lang.String,
* java.lang.String)
*/
public boolean containsTagHandler(String ns, String localName) {
for (int i = 0; i < this.libraries.length; i++) {
if (this.libraries[i].containsTagHandler(ns, localName)) {
return true;
}
}
return false;
}
/*
* (non-Javadoc)
*
* @see com.sun.facelets.tag.TagLibrary#createTagHandler(java.lang.String,
* java.lang.String, com.sun.facelets.tag.TagConfig)
*/
public TagHandler createTagHandler(String ns, String localName,
TagConfig tag) throws FacesException {
for (int i = 0; i < this.libraries.length; i++) {
if (this.libraries[i].containsTagHandler(ns, localName)) {
return this.libraries[i].createTagHandler(ns, localName, tag);
}
}
return null;
}
/*
* (non-Javadoc)
*
* @see com.sun.facelets.tag.TagLibrary#containsFunction(java.lang.String,
* java.lang.String)
*/
public boolean containsFunction(String ns, String name) {
for (int i = 0; i < this.libraries.length; i++) {
if (this.libraries[i].containsFunction(ns, name)) {
return true;
}
}
return false;
}
/*
* (non-Javadoc)
*
* @see com.sun.facelets.tag.TagLibrary#createFunction(java.lang.String,
* java.lang.String)
*/
public Method createFunction(String ns, String name) {
for (int i = 0; i < this.libraries.length; i++) {
if (this.libraries[i].containsFunction(ns, name)) {
return this.libraries[i].createFunction(ns, name);
}
}
return null;
}
}