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package com.sun.xml.ws.policy.privateutil;

import com.sun.istack.logging.Logger;
import java.lang.reflect.Field;

/**
 * This is a helper class that provides some conveniece methods wrapped around the
 * standard {@link java.util.logging.Logger} interface.
 *
 * @author Marek Potociar
 * @author Fabian Ritzmann
 */
public final class PolicyLogger extends Logger {

    /**
     * If we run with JAX-WS, we are using its logging domain (appended with ".wspolicy").
     * Otherwise we default to "wspolicy".
     */
    private static final String POLICY_PACKAGE_ROOT = "com.sun.xml.ws.policy";

    /**
     * Make sure this class cannot be instantiated by client code.
     *
     * @param policyLoggerName The name of the subsystem to be logged.
     * @param className The fully qualified class name.
     */
    private PolicyLogger(final String policyLoggerName, final String className) {
        super(policyLoggerName, className);
    }

    /**
     * The factory method returns preconfigured PolicyLogger wrapper for the class. Since there is no caching implemented,
     * it is advised that the method is called only once per a class in order to initialize a final static logger variable,
     * which is then used through the class to perform actual logging tasks.
     *
     * @param componentClass class of the component that will use the logger instance. Must not be {@code null}.
     * @return logger instance preconfigured for use with the component
     * @throws NullPointerException if the componentClass parameter is {@code null}.
     */
    public static PolicyLogger getLogger(final Class componentClass) {
        final String componentClassName = componentClass.getName();

        if (componentClassName.startsWith(POLICY_PACKAGE_ROOT)) {
            return new PolicyLogger(getLoggingSubsystemName() + componentClassName.substring(POLICY_PACKAGE_ROOT.length()),
                    componentClassName);
        } else {
            return new PolicyLogger(getLoggingSubsystemName() + "." + componentClassName, componentClassName);
        }
    }

    private static String getLoggingSubsystemName() {
        String loggingSubsystemName = "wspolicy";
        try {
            // Looking up JAX-WS class at run-time, so that we don't need to depend
            // on it at compile-time.
            Class jaxwsConstants = Class.forName("com.sun.xml.ws.util.Constants");
            Field loggingDomainField = jaxwsConstants.getField("LoggingDomain");
            Object loggingDomain = loggingDomainField.get(null);
            loggingSubsystemName = loggingDomain.toString().concat(".wspolicy");
        } catch (RuntimeException e) {
            // if we catch an exception, we stick with the default name
            // this catch is redundant but works around a Findbugs warning
        } catch (Exception e) {
            // if we catch an exception, we stick with the default name
        }
        return loggingSubsystemName;
    }

}