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);
}
}