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Statistical sampling library for use in virtualdataset libraries, based on apache commons math 4

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/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.spi;

import ch.qos.logback.core.Context;
import ch.qos.logback.core.status.ErrorStatus;
import ch.qos.logback.core.status.InfoStatus;
import ch.qos.logback.core.status.Status;
import ch.qos.logback.core.status.StatusManager;
import ch.qos.logback.core.status.WarnStatus;

/**
 * A helper class that implements ContextAware methods. A class can implement
 * the ContextAware interface by deriving from this class.
 * 
 * @author Ceki Gülcü
 */
public class ContextAwareBase implements ContextAware {
    private int noContextWarning = 0;
    protected Context context;
    final Object declaredOrigin;

    public ContextAwareBase() {
        declaredOrigin = this;
    }

    public ContextAwareBase(ContextAware declaredOrigin) {
        this.declaredOrigin = declaredOrigin;
    }

    public void setContext(Context context) {
        if (this.context == null) {
            this.context = context;
        } else if (this.context != context) {
            throw new IllegalStateException("Context has been already set");
        }
    }

    public Context getContext() {
        return this.context;
    }

    public StatusManager getStatusManager() {
        if (context == null) {
            return null;
        }
        return context.getStatusManager();
    }

    /**
     * The declared origin of status messages. By default 'this'. Derived classes may override this
     * method to declare other origin.
     * 
     * @return the declared origin, by default 'this'
     */
    protected Object getDeclaredOrigin() {
        return declaredOrigin;
    }

    public void addStatus(Status status) {
        if (context == null) {
            if (noContextWarning++ == 0) {
                System.out.println("LOGBACK: No context given for " + this);
            }
            return;
        }
        StatusManager sm = context.getStatusManager();
        if (sm != null) {
            sm.add(status);
        }
    }

    public void addInfo(String msg) {
        addStatus(new InfoStatus(msg, getDeclaredOrigin()));
    }

    public void addInfo(String msg, Throwable ex) {
        addStatus(new InfoStatus(msg, getDeclaredOrigin(), ex));
    }

    public void addWarn(String msg) {
        addStatus(new WarnStatus(msg, getDeclaredOrigin()));
    }

    public void addWarn(String msg, Throwable ex) {
        addStatus(new WarnStatus(msg, getDeclaredOrigin(), ex));
    }

    public void addError(String msg) {
        addStatus(new ErrorStatus(msg, getDeclaredOrigin()));
    }

    public void addError(String msg, Throwable ex) {
        addStatus(new ErrorStatus(msg, getDeclaredOrigin(), ex));
    }
}