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package com.sun.faces.config.rules;
import org.xml.sax.Attributes;
import com.sun.faces.config.beans.ComponentBean;
import com.sun.faces.config.beans.FacesConfigBean;
/**
* <p>Digester rule for the <code><component></code> element.</p>
*/
public class ComponentRule extends FeatureRule {
private static final String CLASS_NAME =
"com.sun.faces.config.beans.ComponentBean";
// ------------------------------------------------------------ Rule Methods
/**
* <p>Create an empty instance of <code>ComponentBean</code>
* and push it on to the object stack.</p>
*
* @param namespace the namespace URI of the matching element, or an
* empty string if the parser is not namespace aware or the element has
* no namespace
* @param name the local name if the parser is namespace aware, or just
* the element name otherwise
* @param attributes The attribute list of this element
*
* @exception IllegalStateException if the parent stack element is not
* of type FacesConfigBean
*/
public void begin(String namespace, String name,
Attributes attributes) throws Exception {
assert digester.peek() instanceof FacesConfigBean
: "Assertion Error: Expected FacesConfigBean to be at the top of the stack";
if (digester.getLogger().isDebugEnabled()) {
digester.getLogger().debug("[ComponentRule]{" +
digester.getMatch() +
"} Push " + CLASS_NAME);
}
Class clazz =
digester.getClassLoader().loadClass(CLASS_NAME);
ComponentBean cb = (ComponentBean) clazz.newInstance();
digester.push(cb);
}
/**
* <p>No body processing is required.</p>
*
* @param namespace the namespace URI of the matching element, or an
* empty string if the parser is not namespace aware or the element has
* no namespace
* @param name the local name if the parser is namespace aware, or just
* the element name otherwise
* @param text The text of the body of this element
*/
public void body(String namespace, String name,
String text) throws Exception {
}
/**
* <p>Pop the <code>ComponentBean</code> off the top of the stack,
* and either add or merge it with previous information.</p>
*
* @param namespace the namespace URI of the matching element, or an
* empty string if the parser is not namespace aware or the element has
* no namespace
* @param name the local name if the parser is namespace aware, or just
* the element name otherwise
*
* @exception IllegalStateException if the popped object is not
* of the correct type
*/
public void end(String namespace, String name) throws Exception {
ComponentBean top = null;
try {
top = (ComponentBean) digester.pop();
} catch (Exception e) {
throw new IllegalStateException("Popped object is not a " +
CLASS_NAME + " instance");
}
FacesConfigBean fcb = (FacesConfigBean) digester.peek();
ComponentBean old = fcb.getComponent(top.getComponentType());
if (old == null) {
if (digester.getLogger().isDebugEnabled()) {
digester.getLogger().debug("[ComponentRule]{" +
digester.getMatch() +
"} New(" +
top.getComponentType() +
")");
}
fcb.addComponent(top);
} else {
if (digester.getLogger().isDebugEnabled()) {
digester.getLogger().debug("[ComponentRule]{" +
digester.getMatch() +
"} Merge(" +
top.getComponentType() +
")");
}
mergeComponent(top, old);
}
}
/**
* <p>No finish processing is required.</p>
*
*/
public void finish() throws Exception {
}
// ---------------------------------------------------------- Public Methods
public String toString() {
StringBuffer sb = new StringBuffer("ComponentRule[className=");
sb.append(CLASS_NAME);
sb.append("]");
return (sb.toString());
}
// --------------------------------------------------------- Package Methods
// Merge "top" into "old"
static void mergeComponent(ComponentBean top, ComponentBean old) {
// Merge singleton properties
if (top.getComponentClass() != null) {
old.setComponentClass(top.getComponentClass());
}
if (top.getBaseComponentType() != null) {
old.setBaseComponentType(top.getBaseComponentType());
}
if (top.getComponentFamily() != null) {
old.setComponentFamily(top.getComponentFamily());
}
if (top.getRendererType() != null) {
old.setRendererType(top.getRendererType());
}
// Merge common collections
AttributeRule.mergeAttributes(top, old);
mergeFeatures(top, old);
PropertyRule.mergeProperties(top, old);
// Merge unique collections
}
}