| /* |
| * Copyright (C) 2015 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.android.tools.idea.ui.properties; |
| |
| import com.google.common.base.Objects; |
| import org.jetbrains.annotations.NotNull; |
| |
| /** |
| * A property represents a value which can both be set and queried, a concept which is |
| * traditionally implemented in Java via {@code getXXX} and {@code setXXX} methods. |
| * <p/> |
| * Child classes should implement {@link #get()} and {@link #setDirectly(Object)} methods to |
| * support modifying the actual value of this property. |
| */ |
| public abstract class ObservableProperty<T> extends AbstractObservable implements SettableValue<T> { |
| |
| @Override |
| public final void set(@NotNull T value) { |
| if (!areValuesEqual(get(), value)) { |
| setNotificationsEnabled(false); |
| setDirectly(value); |
| setNotificationsEnabled(true); |
| notifyInvalidated(); |
| } |
| } |
| |
| public final void set(@NotNull ObservableValue<T> value) { |
| set(value.get()); |
| } |
| |
| @Override |
| public String toString() { |
| return get().toString(); |
| } |
| |
| /** |
| * Implemented by child classes to handle setting the value of this property. |
| */ |
| protected abstract void setDirectly(@NotNull T value); |
| |
| protected boolean areValuesEqual(@NotNull T value1, @NotNull T value2) { |
| return Objects.equal(value1, value2); |
| } |
| } |