/*
* Copyright 2000-2009 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 com.intellij.openapi.compiler;
import java.io.DataOutput;
import java.io.IOException;
/**
* Instances of this class are associated with the files processed by compilers.
* A file is considered modified if currently associated ValidityState differs from the previously stored ValiditySate for this file.
*/
public interface ValidityState {
/**
* Compares this validity state to other ValidityState.
*
* @param otherState the state to compare with.
* @return true if states can be considered equal, false otherwise.
*/
boolean equalsTo(ValidityState otherState);
/**
* Invoked by make subsystem in order to store the state.
*
* @param out the output to which the state should be stored.
* @throws IOException if the save operation failed because of an I/O error.
* @see TimestampValidityState#load(java.io.DataInputStream)
*/
void save(DataOutput out) throws IOException;
}