| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * 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 com.google.android.apps.common.testing.ui.espresso.matcher; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import org.hamcrest.BaseMatcher; |
| |
| /** |
| * Some matcher sugar that lets you create a matcher for a given type |
| * but only process items of a specific subtype of that matcher. |
| * |
| * @param <T> The desired type of the Matcher. |
| * @param <S> the subtype of T that your matcher applies safely to. |
| */ |
| public abstract class BoundedMatcher<T, S extends T> extends BaseMatcher<T> { |
| |
| private final Class<?> expectedType; |
| private final Class<?>[] interfaceTypes; |
| |
| public BoundedMatcher(Class<? extends S> expectedType) { |
| this.expectedType = checkNotNull(expectedType); |
| this.interfaceTypes = new Class[0]; |
| } |
| |
| public BoundedMatcher(Class<?> expectedType, Class<?> interfaceType1, |
| Class<?>... otherInterfaces) { |
| this.expectedType = checkNotNull(expectedType); |
| checkNotNull(otherInterfaces); |
| int interfaceCount = otherInterfaces.length + 1; |
| this.interfaceTypes = new Class[interfaceCount]; |
| |
| interfaceTypes[0] = checkNotNull(interfaceType1); |
| checkArgument(interfaceType1.isInterface()); |
| int interfaceTypeIdx = 1; |
| for (Class<?> intfType : otherInterfaces) { |
| interfaceTypes[interfaceTypeIdx] = checkNotNull(intfType); |
| checkArgument(intfType.isInterface()); |
| interfaceTypeIdx++; |
| } |
| } |
| |
| protected abstract boolean matchesSafely(S item); |
| |
| @Override |
| @SuppressWarnings({"unchecked"}) |
| public final boolean matches(Object item) { |
| if (item == null) { |
| return false; |
| } |
| |
| if (expectedType.isInstance(item)) { |
| for (Class<?> intfType : interfaceTypes) { |
| if (!intfType.isInstance(item)) { |
| return false; |
| } |
| } |
| return matchesSafely((S) item); |
| } |
| return false; |
| } |
| } |