From 8ca640fe27965d019303e5899bf48e5298ff9c96 Mon Sep 17 00:00:00 2001
From: Artur Signell <artur.signell@itmill.com>
Date: Thu, 30 Dec 2010 14:39:35 +0000
Subject: [PATCH] Static helper methods for finding all available Components
 and ComponentContainers in Vaadin core

svn changeset:16730/svn branch:6.5
---
 tests/src/com/vaadin/tests/VaadinClasses.java | 139 ++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 tests/src/com/vaadin/tests/VaadinClasses.java

diff --git a/tests/src/com/vaadin/tests/VaadinClasses.java b/tests/src/com/vaadin/tests/VaadinClasses.java
new file mode 100644
index 0000000000..5bafa645b6
--- /dev/null
+++ b/tests/src/com/vaadin/tests/VaadinClasses.java
@@ -0,0 +1,139 @@
+package com.vaadin.tests;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.Modifier;
+import java.net.JarURLConnection;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Enumeration;
+import java.util.List;
+import java.util.jar.JarEntry;
+
+import com.vaadin.Application;
+import com.vaadin.ui.Component;
+import com.vaadin.ui.ComponentContainer;
+
+public class VaadinClasses {
+
+    public static void main(String[] args) {
+        System.out.println("ComponentContainers");
+        System.out.println("===================");
+        for (Class<? extends ComponentContainer> c : getComponentContainers()) {
+            System.out.println(c.getName());
+        }
+        System.out.println();
+        System.out.println("Components");
+        System.out.println("==========");
+        for (Class<? extends Component> c : getComponents()) {
+            System.out.println(c.getName());
+        }
+    }
+
+    private static List<Class<? extends Component>> getComponents() {
+        try {
+            return findClasses(Component.class, "com.vaadin.ui");
+        } catch (IOException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public static List<Class<? extends ComponentContainer>> getComponentContainers() {
+        try {
+            return findClasses(ComponentContainer.class, "com.vaadin.ui");
+        } catch (IOException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    private static <T> List<Class<? extends T>> findClasses(Class<T> baseClass,
+            String basePackage) throws IOException {
+        List<Class<? extends T>> componentContainers = new ArrayList<Class<? extends T>>();
+
+        String basePackageDirName = "/" + basePackage.replace('.', '/');
+        URL location = Application.class.getResource(basePackageDirName);
+        if (location.getProtocol().equals("file")) {
+            try {
+                File f = new File(location.toURI());
+                if (!f.exists()) {
+                    throw new IOException("Directory " + f.toString()
+                            + " does not exist");
+                }
+                findPackages(f, basePackage, baseClass, componentContainers);
+            } catch (URISyntaxException e) {
+                throw new IOException(e.getMessage());
+            }
+        } else if (location.getProtocol().equals("jar")) {
+            JarURLConnection juc = (JarURLConnection) location.openConnection();
+            findPackages(juc, basePackage, baseClass, componentContainers);
+        }
+
+        Collections.sort(componentContainers,
+                new Comparator<Class<? extends T>>() {
+
+                    public int compare(Class<? extends T> o1,
+                            Class<? extends T> o2) {
+                        return o1.getName().compareTo(o2.getName());
+                    }
+
+                });
+        return componentContainers;
+
+    }
+
+    private static <T> void findPackages(JarURLConnection juc,
+            String javaPackage, Class<T> baseClass,
+            Collection<Class<? extends T>> result) throws IOException {
+        String prefix = "com/vaadin/ui";
+        Enumeration<JarEntry> ent = juc.getJarFile().entries();
+        while (ent.hasMoreElements()) {
+            JarEntry e = ent.nextElement();
+            if (e.getName().endsWith(".class")
+                    && e.getName().startsWith(prefix)) {
+                String fullyQualifiedClassName = e.getName().replace('/', '.')
+                        .replace(".class", "");
+                addClassIfMatches(result, fullyQualifiedClassName, baseClass);
+            }
+        }
+    }
+
+    private static <T> void findPackages(File parent, String javaPackage,
+            Class<T> baseClass, Collection<Class<? extends T>> result) {
+        for (File file : parent.listFiles()) {
+            if (file.isDirectory()) {
+                findPackages(file, javaPackage + "." + file.getName(),
+                        baseClass, result);
+            } else if (file.getName().endsWith(".class")) {
+                String fullyQualifiedClassName = javaPackage + "."
+                        + file.getName().replace(".class", "");
+                addClassIfMatches(result, fullyQualifiedClassName, baseClass);
+            }
+        }
+
+    }
+
+    @SuppressWarnings("unchecked")
+    private static <T> void addClassIfMatches(
+            Collection<Class<? extends T>> result,
+            String fullyQualifiedClassName, Class<T> baseClass) {
+        try {
+            // Try to load the class
+
+            Class<?> c = Class.forName(fullyQualifiedClassName);
+            if (baseClass.isAssignableFrom(c)
+                    && !Modifier.isAbstract(c.getModifiers())) {
+                result.add((Class<? extends T>) c);
+            }
+        } catch (Exception e) {
+            // Could ignore that class cannot be loaded
+            e.printStackTrace();
+        }
+
+    }
+}
-- 
2.39.5