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diff --git a/src/io/appium/droiddriver/finders/Predicate.java b/src/io/appium/droiddriver/finders/Predicate.java
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+/*
+ * Copyright (C) 2013 DroidDriver committers
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.appium.droiddriver.finders;
+
+/**
+ * Determines a true or false value for a given input.
+ *
+ * This is replicated from the open-source <a
+ * href="http://guava-libraries.googlecode.com">Guava libraries</a>.
+ * <p>
+ * Many apps use Guava. If a test apk also contains a copy of Guava, duplicated
+ * classes in app and test apks may cause error at run-time:
+ * "Class ref in pre-verified class resolved to unexpected implementation". To
+ * simplify the build and deployment set-up, DroidDriver copies the code of some
+ * Guava classes (often simplified) to this package such that it does not depend
+ * on Guava.
+ * </p>
+ */
+public interface Predicate<T> {
+  /**
+   * Returns the result of applying this predicate to {@code input}.
+   */
+  boolean apply(T input);
+
+  /**
+   * {@inheritDoc}
+   *
+   * <p>
+   * It is recommended that this method return the description of this
+   * Predicate.
+   * </p>
+   */
+  @Override
+  String toString();
+}