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.
/**
 * 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.util;

import java.io.PrintStream;
import java.util.Iterator;
import java.util.List;

import ch.qos.logback.core.Context;
import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.helpers.ThrowableToStringArray;
import ch.qos.logback.core.status.*;

import static ch.qos.logback.core.status.StatusUtil.filterStatusListByTimeThreshold;

public class StatusPrinter {

    private static PrintStream ps = System.out;

    static CachingDateFormatter cachingDateFormat = new CachingDateFormatter("HH:mm:ss,SSS");

    public static void setPrintStream(PrintStream printStream) {
        ps = printStream;
    }

    
Print the contents of the context statuses, but only if they contain
warnings or errors.
Params:
context – /**
     * Print the contents of the context statuses, but only if they contain
     * warnings or errors.
     *
     * @param context
     */
    public static void printInCaseOfErrorsOrWarnings(Context context) {
        printInCaseOfErrorsOrWarnings(context, 0);
    }

    
Print the contents of the context status, but only if they contain
warnings or errors occurring later then the threshold.
Params:
context – /**
     * Print the contents of the context status, but only if they contain
     * warnings or errors occurring later then the threshold.
     *
     * @param context
     */
    public static void printInCaseOfErrorsOrWarnings(Context context, long threshold) {
        if (context == null) {
            throw new IllegalArgumentException("Context argument cannot be null");
        }

        StatusManager sm = context.getStatusManager();
        if (sm == null) {
            ps.println("WARN: Context named \"" + context.getName() + "\" has no status manager");
        } else {
            StatusUtil statusUtil = new StatusUtil(context);
            if (statusUtil.getHighestLevel(threshold) >= ErrorStatus.WARN) {
                print(sm, threshold);
            }
        }
    }

    
Print the contents of the context statuses, but only if they contain
errors.
Params:
context – /**
     * Print the contents of the context statuses, but only if they contain
     * errors.
     *
     * @param context
     */
    public static void printIfErrorsOccured(Context context) {
        if (context == null) {
            throw new IllegalArgumentException("Context argument cannot be null");
        }

        StatusManager sm = context.getStatusManager();
        if (sm == null) {
            ps.println("WARN: Context named \"" + context.getName() + "\" has no status manager");
        } else {
            StatusUtil statusUtil = new StatusUtil(context);
            if (statusUtil.getHighestLevel(0) == ErrorStatus.ERROR) {
                print(sm);
            }
        }
    }

    
Print the contents of the context's status data.
Params:
context – /**
     * Print the contents of the context's status data.
     *
     * @param context
     */
    public static void print(Context context) {
        print(context, 0);
    }

    
Print context's status data with a timestamp higher than the threshold.
Params:
context – /**
    * Print context's status data with a timestamp higher than the threshold.
    * @param context
    */
    public static void print(Context context, long threshold) {
        if (context == null) {
            throw new IllegalArgumentException("Context argument cannot be null");
        }

        StatusManager sm = context.getStatusManager();
        if (sm == null) {
            ps.println("WARN: Context named \"" + context.getName() + "\" has no status manager");
        } else {
            print(sm, threshold);
        }
    }

    public static void print(StatusManager sm) {
        print(sm, 0);
    }

    public static void print(StatusManager sm, long threshold) {
        StringBuilder sb = new StringBuilder();
        List<Status> filteredList = filterStatusListByTimeThreshold(sm.getCopyOfStatusList(), threshold);
        buildStrFromStatusList(sb, filteredList);
        ps.println(sb.toString());
    }

    public static void print(List<Status> statusList) {
        StringBuilder sb = new StringBuilder();
        buildStrFromStatusList(sb, statusList);
        ps.println(sb.toString());
    }

    private static void buildStrFromStatusList(StringBuilder sb, List<Status> statusList) {
        if (statusList == null)
            return;
        for (Status s : statusList) {
            buildStr(sb, "", s);
        }
    }

    // private static void buildStrFromStatusManager(StringBuilder sb, StatusManager sm) {
    // }

    private static void appendThrowable(StringBuilder sb, Throwable t) {
        String[] stringRep = ThrowableToStringArray.convert(t);

        for (String s : stringRep) {
            if (s.startsWith(CoreConstants.CAUSED_BY)) {
                // nothing
            } else if (Character.isDigit(s.charAt(0))) {
                // if line resembles "48 common frames omitted"
                sb.append("\t... ");
            } else {
                // most of the time. just add a tab+"at"
                sb.append("\tat ");
            }
            sb.append(s).append(CoreConstants.LINE_SEPARATOR);
        }
    }

    public static void buildStr(StringBuilder sb, String indentation, Status s) {
        String prefix;
        if (s.hasChildren()) {
            prefix = indentation + "+ ";
        } else {
            prefix = indentation + "|-";
        }

        if (cachingDateFormat != null) {
            String dateStr = cachingDateFormat.format(s.getDate());
            sb.append(dateStr).append(" ");
        }
        sb.append(prefix).append(s).append(CoreConstants.LINE_SEPARATOR);

        if (s.getThrowable() != null) {
            appendThrowable(sb, s.getThrowable());
        }
        if (s.hasChildren()) {
            Iterator<Status> ite = s.iterator();
            while (ite.hasNext()) {
                Status child = ite.next();
                buildStr(sb, indentation + "  ", child);
            }
        }
    }

}