1 /* 2 * Copyright (C) 2013 DroidDriver committers 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package io.appium.droiddriver.validators; 18 19 import io.appium.droiddriver.UiElement; 20 import io.appium.droiddriver.actions.Action; 21 22 /** 23 * Interface for validating a UiElement, checked when an action is performed. 24 * For example, in general accessibility mandates that an actionable UiElement 25 * has content description or text. 26 */ 27 public interface Validator { 28 /** 29 * Returns true if this {@link Validator} applies to {@code element} on this 30 * {@code action}. 31 */ 32 boolean isApplicable(UiElement element, Action action); 33 34 /** 35 * Returns {@code null} if {@code element} is valid on this {@code action}, 36 * otherwise a string describing the failure. 37 */ 38 String validate(UiElement element, Action action); 39 } 40
