android/src/com/android/tools/idea/ui/properties/core/StringProperty.java

/*
 * 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.core;

import com.android.tools.idea.ui.properties.ObservableProperty;
import com.android.tools.idea.ui.properties.expressions.string.IsEmptyExpression;
import com.android.tools.idea.ui.properties.expressions.string.TrimExpression;
import org.jetbrains.annotations.NotNull;

/**
 * Base class that every string-type property should inherit from, as it provides useful methods
 * that enable chaining.
 */
public abstract class StringProperty extends ObservableProperty<String> implements ObservableString {

  public void clear() {
    set("");
  }

  @NotNull
  @Override
  public ObservableBool isEmpty() {
    return new IsEmptyExpression(this);
  }

  @NotNull
  @Override
  public ObservableString trim() {
    return new TrimExpression(this);
  }
}