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The James core module is part of the James framework for optimization using local search metaheuristics in Java. The core contains general components to model problems, objectives and constraints, as well as generic algorithms to solve the problems. Moreover, the core provides implementations of specific utilities for subset selection.

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//  Copyright 2014 Herman De Beukelaer
//
//  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.
//  Copyright 2014 Herman De Beukelaer
//
//  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.jamesframework.core.util;

/**
 * Global container defining constants used across the framework.
 * 
 * @author Herman De Beukelaer
 */
public class JamesConstants {

    /**
     * Used to indicate an invalid timestamp, for example belonging to an event which has not yet occurred.
     */
    public static final long INVALID_TIMESTAMP = -1;
    
    /**
     * Used to indicate an invalid time span.
     */
    public static final long INVALID_TIME_SPAN = -1;
    
    /**
     * Indicates an invalid number of steps.
     */
    public static final long INVALID_STEP_COUNT = -1;
    
    /**
     * Indicates an invalid number of moves.
     */
    public static final long INVALID_MOVE_COUNT = -1;
    
    /**
     * Indicates an invalid delta (amount of improvement).
     */
    public static final double INVALID_DELTA = -1.0;
        
}