/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.usergrid.chop.example;
import com.google.common.base.Preconditions;
import com.google.inject.Inject;
/**
* A mechanical watch powered by a Mainspring.
*/
public class MechanicalWatch implements Watch {
private Mainspring spring;
@Inject
public void addPowerSource( PowerSource powerSource ) {
Preconditions.checkState( powerSource.hasPower(), "Make sure the spring is wound before starting." );
this.spring = ( Mainspring ) powerSource;
}
public void wind( long amount ) {
spring.windSpring( amount );
}
@Override
public long getTime() {
Preconditions.checkState( spring.hasPower(), "Can't get the time if the spring is not wound." );
return System.currentTimeMillis();
}
@Override
public boolean isDead() {
return ! spring.hasPower();
}
@Override
public Type getType() {
return Type.MECHANICAL;
}
}