1 files changed, 39 insertions, 0 deletions
diff --git a/src/io/appium/droiddriver/validators/Validator.java b/src/io/appium/droiddriver/validators/Validator.java
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+++ b/src/io/appium/droiddriver/validators/Validator.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.validators;
+
+import io.appium.droiddriver.UiElement;
+import io.appium.droiddriver.actions.Action;
+
+/**
+ * Interface for validating a UiElement, checked when an action is performed.
+ * For example, in general accessibility mandates that an actionable UiElement
+ * has content description or text.
+ */
+public interface Validator {
+  /**
+   * Returns true if this {@link Validator} applies to {@code element} on this
+   * {@code action}.
+   */
+  boolean isApplicable(UiElement element, Action action);
+
+  /**
+   * Returns {@code null} if {@code element} is valid on this {@code action},
+   * otherwise a string describing the failure.
+   */
+  String validate(UiElement element, Action action);
+}