Filter encoding.

 package pl.com.it_crowd.youtrack.api;
 
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -35,6 +37,8 @@ public final class FilterHelper {
 
         private List<Condition> conditions = new ArrayList<Condition>();
 
+        private long maxResults;
+
 // --------------------------- CONSTRUCTORS ---------------------------
 
         private Filter()
@@ -48,15 +52,28 @@ public final class FilterHelper {
         public String toString()
         {
             StringBuilder builder = new StringBuilder();
+            String space;
+            try {
+                space = URLEncoder.encode(" ", "UTF-8");
+            } catch (UnsupportedEncodingException e) {
+                throw new RuntimeException(e);
+            }
             for (Condition condition : conditions) {
+                builder.append(space);
                 if (condition.key != null) {
-                    builder.append(" ");
                     builder.append(condition.key);
                     builder.append(":");
                 }
-                builder.append(condition.value);
+                try {
+                    builder.append(URLEncoder.encode(condition.value, "UTF-8"));
+                } catch (UnsupportedEncodingException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+            if (maxResults > 0) {
+                builder.append("&max=").append(maxResults);
             }
-            return builder.toString();
+            return builder.toString().trim();
         }
 
 // -------------------------- OTHER METHODS --------------------------
@@ -67,6 +84,12 @@ public final class FilterHelper {
             return this;
         }
 
+        public Filter maxResults(long maxResults)
+        {
+            this.maxResults = maxResults;
+            return this;
+        }
+
         public Filter summary(String summary)
         {
             conditions.add(new Condition(null, summary));
@@ -75,14 +98,15 @@ public final class FilterHelper {
 
         public Filter unresolved()
         {
-            conditions.add(new Condition(null, "#Unresolved"));
+            conditions.add(new Condition(Key.STATE, "Unresolved"));
             return this;
         }
 
 // -------------------------- ENUMERATIONS --------------------------
 
         private enum Key {
-            ISSUE_ID("issue id");
+            ISSUE_ID("issue id"),
+            STATE("state");
 
 // ------------------------------ FIELDS ------------------------------