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package com.sun.faces.scripting.groovy;
import com.sun.faces.util.FacesLogger;
import com.sun.faces.util.Util;
import groovy.util.GroovyScriptEngine;
import javax.faces.FacesException;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletContext;
/**
* Helper class to interface with the Groovy runtime.
*/
class GroovyHelperImpl extends GroovyHelper {
private static final Logger LOGGER = FacesLogger.APPLICATION.getLogger();
private static final String SCRIPT_PATH = "/WEB-INF/groovy/";
private MojarraGroovyClassLoader loader;
// ------------------------------------------------------------ Constructors
GroovyHelperImpl() throws Exception {
FacesContext facesContext = FacesContext.getCurrentInstance();
ExternalContext extContext = facesContext.getExternalContext();
ClassLoader curLoader = Thread.currentThread().getContextClassLoader();
URL combinedRoots[] = getResourceRoots(extContext, curLoader);
if (0 < combinedRoots.length) {
GroovyScriptEngine engine =
new GroovyScriptEngine(combinedRoots, curLoader);
// Class c = Util.loadClass("groovy.util.GroovyScriptEngine", GroovyHelperFactory.class);
// Constructor ctor = c.getConstructor(URL[].class, ClassLoader.class);
// GroovyScriptEngine engine = (GroovyScriptEngine)ctor.newInstance(combinedRoots, curLoader);
loader = new MojarraGroovyClassLoader(engine);
if (LOGGER.isLoggable(Level.INFO)) {
LOGGER.log(Level.INFO,
"Groovy support enabled.");
}
extContext.getApplicationMap().put("com.sun.faces.groovyhelper",
this);
((ServletContext)(extContext.getContext())).setAttribute("com.sun.faces.groovyhelper", this);
}
}
private URL[] getResourceRoots(ExternalContext extContext,
ClassLoader curLoader) throws IOException {
URL[] combinedRoots;
Enumeration classpathResourceEnumeration =
curLoader.getResources("META-INF/resources/");
List classpathResourceList = new ArrayList();
while (classpathResourceEnumeration.hasMoreElements()) {
classpathResourceList.add(classpathResourceEnumeration.nextElement());
}
// only called during init - safe to cast and save.
URL u = extContext.getResource(SCRIPT_PATH);
URL webappRoots[] = getWebappResourceRoots(extContext),
classpathRoots[] = new URL[classpathResourceList.size()];
classpathResourceList.toArray(classpathRoots);
if (null != u ||
0 < webappRoots.length ||
0 < classpathRoots.length) {
combinedRoots = new URL[webappRoots.length + classpathRoots.length +
(null != u ? 1 : 0)];
System.arraycopy(webappRoots, 0,
combinedRoots, 0,
webappRoots.length);
System.arraycopy(classpathRoots, 0,
combinedRoots, webappRoots.length,
classpathRoots.length);
if (null != u) {
combinedRoots[webappRoots.length + classpathRoots.length] = u;
}
} else {
combinedRoots = new URL[0];
}
return combinedRoots;
}
private URL[] getWebappResourceRoots(ExternalContext extContext) {
URL[] result = null;
int size = 0, i = 0;
Set resourceRoots = extContext.getResourcePaths("/resources/");
if (null != resourceRoots && !resourceRoots.isEmpty()) {
// Determine the size of script roots that end with "/"
for (String cur : resourceRoots) {
if (cur.endsWith("/")) {
size++;
}
}
result = new URL[size];
for (String cur : resourceRoots) {
if (cur.endsWith("/")) {
try {
result[i++] = extContext.getResource(cur);
} catch (MalformedURLException ex) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, null, ex);
}
}
}
}
}
if (null == result) {
result = new URL[0];
}
return result;
}
public void addURL(URL toAdd) {
loader.getGroovyScriptEngine().getGroovyClassLoader().addURL(toAdd);
}
// ---------------------------------------------------------- Public Methods
public Class loadScript(String name) {
try {
String script = name;
if (script.endsWith(".groovy")) {
script = script.substring(0, script.indexOf(".groovy"));
}
//return engine.loadScriptByName(script);
return Util.loadClass(script, this);
} catch (Exception e) {
throw new FacesException(e);
}
}
public void setClassLoader() {
if (loader != null) {
Thread.currentThread().setContextClassLoader(loader);
}
}
// ----------------------------------------------------------- Inner Classes
private static final class MojarraGroovyClassLoader extends URLClassLoader {
private GroovyScriptEngine gse;
public MojarraGroovyClassLoader(GroovyScriptEngine gse) {
super(new URL[0], gse.getGroovyClassLoader());
gse.getGroovyClassLoader().setShouldRecompile(Boolean.TRUE);
this.gse = gse;
}
public GroovyScriptEngine getGroovyScriptEngine() {
return gse;
}
@Override
public Class loadClass(String name) throws ClassNotFoundException {
if (name == null) {
throw new NullPointerException();
}
Class c;
try {
c = gse.loadScriptByName(name);
} catch (Exception e) {
try {
c = gse.getGroovyClassLoader().loadClass(name);
} catch (ClassNotFoundException cnfe) {
throw new ClassNotFoundException(name, cnfe);
}
}
if (c == null) {
throw new ClassNotFoundException(name);
}
return c;
}
}
}
