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Provides simple observable properties with binding capabilities.

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/*
 * Copyright 2017 Johannes Donath 
 * and other copyright owners as documented in the project's IP log.
 *
 * 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.torchmind.observable.concurrent.primitive;

import com.torchmind.observable.concurrent.AbstractBlockingObservable;
import com.torchmind.observable.listener.ValidationListener;
import com.torchmind.observable.primitive.DoubleObservable;
import edu.umd.cs.findbugs.annotations.Nullable;

/**
 * Provides a observable implementation which simplifies access to double values.
 *
 * @author Johannes Donath
 */
public class BlockingDoubleObservable extends AbstractBlockingObservable implements
    DoubleObservable {

  private final double fallbackValue;

  public BlockingDoubleObservable(
      @Nullable ValidationListener validationListener,
      Double value, boolean fair, double fallbackValue) {
    super(validationListener, value, fair);
    this.fallbackValue = fallbackValue;
  }

  public BlockingDoubleObservable(
      @Nullable ValidationListener validationListener,
      Double value, double fallbackValue) {
    super(validationListener, value);
    this.fallbackValue = fallbackValue;
  }

  public BlockingDoubleObservable(Double value) {
    this(null, value, 0);
  }

  public BlockingDoubleObservable() {
    this(null);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public double getValue() {
    Double value = this.get();

    if (value == null) {
      return this.fallbackValue;
    }

    return value;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void setValue(double value) {
    this.set(value);
  }
}