Initial factory constructors for generated objects in Java server.

editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/SourceChange.java

Index: editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/SourceChange.java
diff --git a/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/SourceChange.java b/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/SourceChange.java
index a7b59c94f811281c1936b2a74e4463a08a84d0da..cc021607f9d684996164dd746653478cd88a6956 100644
--- a/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/SourceChange.java
+++ b/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/SourceChange.java
@@ -19,10 +19,15 @@ package com.google.dart.server.generated.types;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
+import com.google.common.collect.Lists;
+import com.google.dart.server.utilities.general.JsonUtilities;
 import com.google.dart.server.utilities.general.ObjectUtilities;
 import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonPrimitive;
+import java.util.ArrayList;
+import java.util.Iterator;
 import org.apache.commons.lang3.StringUtils;
 
 /**
@@ -33,11 +38,10 @@ import org.apache.commons.lang3.StringUtils;
 @SuppressWarnings("unused")
 public class SourceChange {
 
-  /**
-   * An empty array of {@link SourceChange}s.
-   */
   public static final SourceChange[] EMPTY_ARRAY = new SourceChange[0];
 
+  public static final List<SourceChange> EMPTY_LIST = Lists.newArrayList();
+
   /**
    * A human-readable description of the change to be applied.
    */
@@ -81,6 +85,26 @@ public class SourceChange {
     return false;
   }
 
+  public static SourceChange fromJson(JsonObject jsonObject) {
+    String message = jsonObject.get("message").getAsString();
+    List<SourceFileEdit> edits = SourceFileEdit.fromJsonArray(jsonObject.get("edits").getAsJsonArray());
+    List<LinkedEditGroup> linkedEditGroups = LinkedEditGroup.fromJsonArray(jsonObject.get("linkedEditGroups").getAsJsonArray());
+    Position selection = jsonObject.get("selection") == null ? null : Position.fromJson(jsonObject.get("selection").getAsJsonObject());
+    return new SourceChange(message, edits, linkedEditGroups, selection);
+  }
+
+  public static List<SourceChange> fromJsonArray(JsonArray jsonArray) {
+    if (jsonArray == null) {
+      return EMPTY_LIST;
+    }
+    ArrayList<SourceChange> list = new ArrayList<SourceChange>(jsonArray.size());
+    Iterator<JsonElement> iterator = jsonArray.iterator();
+    while (iterator.hasNext()) {
+      list.add(fromJson(iterator.next().getAsJsonObject()));
+    }
+    return list;
+  }
+
   /**
    * A list of the edits used to effect the change, grouped by file.
    */