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The module for FunctionalJ Core.

There is a newer version: 1.0.17

// ============================================================================
// Copyright (c) 2017-2019 Nawapunth Manusitthipol (NawaMan - http://nawaman.net).
// ----------------------------------------------------------------------------
// MIT License
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
// ============================================================================
package functionalj.ref;

import java.util.concurrent.atomic.AtomicReference;

class Holder {
    
    private Object data;
    
    Holder(boolean isLocal) {
        this.data = isLocal ? new ThreadLocal() : new AtomicReference();
    }
    
    public boolean isLocal() {
        return this.data instanceof ThreadLocal;
    }
    
    @SuppressWarnings("unchecked")
    public STATE get() {
        if (isLocal()) 
            return ((ThreadLocal)data).get();
       else return ((AtomicReference)data).get();
    }
    
    @SuppressWarnings("unchecked")
    public void set(STATE oldState, STATE newState) {
        if (isLocal()) 
             ((ThreadLocal)data).set(newState);
        else ((AtomicReference)data).compareAndSet(oldState, newState);
    }
    
}