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package com.sun.faces.config.rules;
import org.xml.sax.Attributes;
import com.sun.faces.config.beans.AttributeBean;
import com.sun.faces.config.beans.AttributeHolder;
/**
* <p>Digester rule for the <code><attribute></code> element.</p>
*/
public class AttributeRule extends FeatureRule {
private static final String CLASS_NAME =
"com.sun.faces.config.beans.AttributeBean";
// ------------------------------------------------------------ Rule Methods
/**
* <p>Create an empty instance of <code>AttributeBean</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 AttributeHolder
: "Assertion Error: Expected AttributeHolder to be at the top of the stack";
if (digester.getLogger().isDebugEnabled()) {
digester.getLogger().debug("[AttributeRule]{" +
digester.getMatch() +
"} Push " + CLASS_NAME);
}
Class clazz =
digester.getClassLoader().loadClass(CLASS_NAME);
AttributeBean ab = (AttributeBean) clazz.newInstance();
digester.push(ab);
}
/**
* <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>AttributeBean</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 {
AttributeBean top = null;
try {
top = (AttributeBean) digester.pop();
} catch (Exception e) {
throw new IllegalStateException("Popped object is not a " +
CLASS_NAME + " instance");
}
AttributeHolder ah = (AttributeHolder) digester.peek();
AttributeBean old = ah.getAttribute(top.getAttributeName());
if (old == null) {
if (digester.getLogger().isDebugEnabled()) {
digester.getLogger().debug("[AttributeRule]{" +
digester.getMatch() +
"} New(" +
top.getAttributeName() +
")");
}
ah.addAttribute(top);
} else {
if (digester.getLogger().isDebugEnabled()) {
digester.getLogger().debug("[AttributeRule]{" +
digester.getMatch() +
"} Merge(" +
top.getAttributeName() +
")");
}
mergeAttribute(top, old);
}
}
/**
* <p>No finish processing is required.</p>
*
*/
public void finish() throws Exception {
}
// ---------------------------------------------------------- Public Methods
public String toString() {
StringBuffer sb = new StringBuffer("AttributeRule[className=");
sb.append(CLASS_NAME);
sb.append("]");
return (sb.toString());
}
// --------------------------------------------------------- Package Methods
// Merge "top" into "old"
static void mergeAttribute(AttributeBean top, AttributeBean old) {
// Merge singleton properties
if (top.getAttributeClass() != null) {
old.setAttributeClass(top.getAttributeClass());
}
if (top.getSuggestedValue() != null) {
old.setSuggestedValue(top.getSuggestedValue());
}
if (top.getDefaultValue() != null) {
old.setDefaultValue(top.getDefaultValue());
}
if (top.isPassThrough()) {
old.setPassThrough(true);
}
if (top.isRequired()) {
old.setRequired(true);
}
if (!top.isTagAttribute()) {
old.setTagAttribute(false);
}
if(null != top.getBehaviors()){
old.addAllBehaviors(top.getBehaviors());
}
if(top.isDefaultBehavior()){
old.setDefaultBehavior(true);
}
// Merge common collections
mergeFeatures(top, old);
// Merge unique collections
}
// Merge "top" into "old"
static void mergeAttributes(AttributeHolder top, AttributeHolder old) {
AttributeBean ab[] = top.getAttributes();
for (int i = 0; i < ab.length; i++) {
AttributeBean abo = old.getAttribute(ab[i].getAttributeName());
if (abo == null) {
old.addAttribute(ab[i]);
} else {
mergeAttribute(ab[i], abo);
}
}
}
}