| /* |
| * Copyright 2000-2012 JetBrains s.r.o. |
| * |
| * 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 org.jetbrains.jps.incremental.storage; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| /** |
| * A simple implementation of ValidityState that is enough for most cases. |
| * The file is considered modified if its timestamp is changed. |
| */ |
| public final class TimestampValidityState implements ValidityState { |
| private final long myTimestamp; |
| |
| /** |
| * Loads the validity state from the specified stream. |
| * |
| * @param is the stream to load the validity state from. |
| * @throws IOException if the stream read fails. |
| */ |
| public TimestampValidityState(DataInput is) throws IOException{ |
| myTimestamp = is.readLong(); |
| } |
| |
| /** |
| * Creates a validity state with the specified timestamp. |
| * |
| * @param timestamp the timestamp for the validity state. |
| */ |
| public TimestampValidityState(long timestamp) { |
| myTimestamp = timestamp; |
| } |
| |
| public long getTimestamp() { |
| return myTimestamp; |
| } |
| |
| public boolean equalsTo(ValidityState otherState) { |
| return otherState instanceof TimestampValidityState && myTimestamp == ((TimestampValidityState)otherState).myTimestamp; |
| } |
| |
| /** |
| * Saves the validity state to the specified stream. |
| * |
| * @param out |
| * @throws java.io.IOException if the stream write fails. |
| */ |
| public void save(DataOutput out) throws IOException { |
| out.writeLong(myTimestamp); |
| } |
| } |