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A log library that embraces the kiss principle.

There is a newer version: 2.1.2

package org.mentalog.config;

import org.mentalog.Log;


public class ConfigParam {

	private static boolean forceMode = false;

	private E value = null;
	private boolean wasForced = false;
	private boolean wasSet = false;
	private final String name;
	private final E defValue;

	public ConfigParam(String name, E defValue) {
		this.name = name;
		this.defValue = defValue;
		init(name);
	}
	
	protected void init(String name) {
		String s = getString(name, null);
		if (s != null) {
			set(parseString(s), true);
		}
	}
	
	@SuppressWarnings("unchecked")
	protected E parseString(String s) {
		try {
			Class klass = Class.forName(s);
			return (E) klass.newInstance();
		} catch(Exception e) {
			throw new RuntimeException(e);
		}
	}

	public E getDefault() {
		return defValue;
	}

	public static void setForceMode(boolean flag) {
		forceMode = flag;
	}
	
	protected void force() {
		wasForced = true;
	}
	
	public static void checkAndLog(String name, Object attemptedValue, Object currentValue) {
		if (Log.isShowBypassedConfig() && !isSame(attemptedValue, currentValue)) {
			Log level = Log.getShowBypassedConfigLevel();
			level.log("Bypassing configuration!", "config =", name, "attemptedValue =", attemptedValue, "currentValue =", currentValue);
		}
	}
	
	private static boolean isSame(Object o1, Object o2) {
		if (o1 == o2) return true;
		if (o1 != null && o2 == null) return false;
		if (o1 == null && o2 != null) return false;
		return o1.equals(o2);
	}

	public void set(E value, boolean force) {
		if (wasForced && !force) {
			checkAndLog(name, value, this.value);
			return;
		}
		this.wasSet = true;
		this.wasForced = force;
		this.value = value;
	}

	public final void set(E value) {
		set(value, forceMode);
	}

	public final boolean isSet() {
		return wasSet;
	}

	public final boolean isForced() {
		return wasForced;
	}
	
	protected final boolean isForceMode() {
		return forceMode;
	}

	public final String getName() {
		return name;
	}

	public final E value() {

		if (!isSet() && defValue != null) {
			return defValue;
		}
		return value;
	}

	protected static String getString(String name, String def) {
		
		String[] temp = name.split(",");
		
		String s = null;
		
		for(String x : temp) {

			s = System.getenv(x);
    
    		if (s == null) {
    			s = System.getProperty(x);
    		}
    
    		if (s != null) {
    			break;
    		}
		}
		
		if (s == null) {
			return def;
		}

		return s;
	}
}