Eliminate most server-side Guava use

Change-Id: Iac0f5c96d827e2078ace0be76bc14aa34f379d57

server/src/main/java/com/vaadin/data/util/GeneratedPropertyContainer.java

@@ -27,7 +27,6 @@ import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Set;
 
-import com.google.gwt.thirdparty.guava.common.collect.Sets;
 import com.vaadin.data.Container;
 import com.vaadin.data.Item;
 import com.vaadin.data.Property;
@@ -146,10 +145,11 @@ public class GeneratedPropertyContainer extends AbstractContainer implements
 
         @Override
         public Collection<?> getItemPropertyIds() {
-            Set<?> wrappedProperties = asSet(wrappedItem.getItemPropertyIds());
-            return Sets.union(
-                    Sets.difference(wrappedProperties, removedProperties),
-                    propertyGenerators.keySet());
+            Set<Object> wrappedProperties = new LinkedHashSet<Object>(
+                    wrappedItem.getItemPropertyIds());
+            wrappedProperties.removeAll(removedProperties);
+            wrappedProperties.addAll(propertyGenerators.keySet());
+            return wrappedProperties;
         }
 
         @Override
@@ -366,14 +366,6 @@ public class GeneratedPropertyContainer extends AbstractContainer implements
         return new GeneratedProperty<T>(item, propertyId, itemId, generator);
     }
 
-    private static <T> LinkedHashSet<T> asSet(Collection<T> collection) {
-        if (collection instanceof LinkedHashSet) {
-            return (LinkedHashSet<T>) collection;
-        } else {
-            return new LinkedHashSet<T>(collection);
-        }
-    }
-
     /* Listener functionality */
 
     @Override
@@ -618,11 +610,11 @@ public class GeneratedPropertyContainer extends AbstractContainer implements
      */
     @Override
     public Collection<?> getContainerPropertyIds() {
-        Set<?> wrappedProperties = asSet(wrappedContainer
-                .getContainerPropertyIds());
-        return Sets.union(
-                Sets.difference(wrappedProperties, removedProperties),
-                propertyGenerators.keySet());
+        Set<Object> wrappedProperties = new LinkedHashSet<Object>(
+                wrappedContainer.getContainerPropertyIds());
+        wrappedProperties.removeAll(removedProperties);
+        wrappedProperties.addAll(propertyGenerators.keySet());
+        return wrappedProperties;
     }
 
     /**

server/src/main/java/com/vaadin/event/SelectionEvent.java

@@ -22,8 +22,6 @@ import java.util.EventObject;
 import java.util.LinkedHashSet;
 import java.util.Set;
 
-import com.google.gwt.thirdparty.guava.common.collect.Sets;
-
 /**
  * An event that specifies what in a selection has changed, and where the
  * selection took place.
@@ -52,7 +50,7 @@ public class SelectionEvent extends EventObject {
      * @return a Collection of the itemIds that became selected
      */
     public Set<Object> getAdded() {
-        return Sets.difference(newSelection, oldSelection);
+        return setDifference(newSelection, oldSelection);
     }
 
     /**
@@ -64,7 +62,27 @@ public class SelectionEvent extends EventObject {
      * @return a Collection of the itemIds that became deselected
      */
     public Set<Object> getRemoved() {
-        return Sets.difference(oldSelection, newSelection);
+        return setDifference(oldSelection, newSelection);
+    }
+
+    /**
+     * Slightly optimized set difference that can return the original set or a
+     * modified one.
+     *
+     * @param set1
+     *            original set
+     * @param set2
+     *            the set to subtract
+     * @return the difference set
+     */
+    private static <T> Set<T> setDifference(Set<T> set1, Set<T> set2) {
+        if (set2.isEmpty()) {
+            return set1;
+        } else {
+            LinkedHashSet<T> set = new LinkedHashSet<T>(set1);
+            set.removeAll(set2);
+            return set;
+        }
     }
 
     /**

server/src/main/java/com/vaadin/server/VaadinPortletResponse.java

@@ -30,8 +30,6 @@ import javax.portlet.PortletResponse;
 import javax.portlet.ResourceResponse;
 import javax.servlet.http.Cookie;
 
-import com.google.gwt.thirdparty.guava.common.html.HtmlEscapers;
-
 /**
  * Wrapper for {@link PortletResponse} and its subclasses.
  * 
@@ -139,11 +137,45 @@ public class VaadinPortletResponse implements VaadinResponse {
     public void sendError(int errorCode, String message) throws IOException {
         setStatus(errorCode);
         if (message != null) {
-            message = HtmlEscapers.htmlEscaper().escape(message);
+            message = escapeHtml(message);
         }
         getWriter().write(message);
     }
 
+    /**
+     * Perform minimal HTML escaping similar to Guava HtmlEscapers.
+     *
+     * @param input
+     *            string to escape
+     * @return minimally escaped HTML safe string
+     */
+    private static String escapeHtml(String input) {
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < input.length(); i++) {
+            char c = input.charAt(i);
+            switch (c) {
+            case '"':
+                sb.append("&quot;");
+                break;
+            case '\'':
+                sb.append("&#39;");
+                break;
+            case '&':
+                sb.append("&amp;");
+                break;
+            case '<':
+                sb.append("&lt;");
+                break;
+            case '>':
+                sb.append("&gt;");
+                break;
+            default:
+                sb.append(c);
+            }
+        }
+        return sb.toString();
+    }
+
     @Override
     public VaadinPortletService getService() {
         return vaadinService;

server/src/main/java/com/vaadin/server/VaadinServlet.java

@@ -17,7 +17,9 @@ package com.vaadin.server;
 
 import java.io.BufferedWriter;
 import java.io.File;
+import java.io.FileInputStream;
 import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -26,10 +28,11 @@ import java.io.PrintWriter;
 import java.io.Serializable;
 import java.lang.reflect.Method;
 import java.net.MalformedURLException;
+import java.net.URISyntaxException;
 import java.net.URL;
 import java.net.URLConnection;
 import java.net.URLDecoder;
-import java.net.URISyntaxException;
+import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -48,8 +51,6 @@ import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
-import com.google.gwt.thirdparty.guava.common.base.Charsets;
-import com.google.gwt.thirdparty.guava.common.io.Files;
 import com.vaadin.annotations.VaadinServletConfiguration;
 import com.vaadin.annotations.VaadinServletConfiguration.InitParameterName;
 import com.vaadin.sass.internal.ScssStylesheet;
@@ -1069,7 +1070,7 @@ public class VaadinServlet extends HttpServlet implements Constants {
             return null;
         }
 
-        String jsonString = Files.toString(scssCacheFile, Charsets.UTF_8);
+        String jsonString = readFile(scssCacheFile, Charset.forName("UTF-8"));
 
         JsonObject entryJson = Json.parse(jsonString);
 
@@ -1379,13 +1380,45 @@ public class VaadinServlet extends HttpServlet implements Constants {
         String cacheEntryJsonString = cacheEntry.asJson();
 
         try {
-            Files.write(cacheEntryJsonString, cacheFile, Charsets.UTF_8);
+            writeFile(cacheEntryJsonString, cacheFile, Charset.forName("UTF-8"));
         } catch (IOException e) {
             getLogger().log(Level.WARNING,
                     "Error persisting scss cache " + cacheFile, e);
         }
     }
 
+    private static String readFile(File file, Charset charset)
+            throws IOException {
+        InputStream in = new FileInputStream(file);
+        try {
+            // no point in reading files over 2GB to a String
+            byte[] b = new byte[(int) file.length()];
+            int len = b.length;
+            int total = 0;
+
+            while (total < len) {
+                int result = in.read(b, total, len - total);
+                if (result == -1) {
+                    break;
+                }
+                total += result;
+            }
+            return new String(b, charset);
+        } finally {
+            in.close();
+        }
+    }
+
+    private static void writeFile(String content, File file, Charset charset)
+            throws IOException {
+        FileOutputStream fos = new FileOutputStream(file);
+        try {
+            fos.write(content.getBytes(charset));
+        } finally {
+            fos.close();
+        }
+    }
+
     private static File getScssCacheFile(File scssFile) {
         return new File(scssFile.getParentFile(), scssFile.getName() + ".cache");
     }