org.projectforge.common.ExceptionHelper.java Source code

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Here is the source code for org.projectforge.common.ExceptionHelper.java

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/////////////////////////////////////////////////////////////////////////////
//
// Project ProjectForge Community Edition
//         www.projectforge.org
//
// Copyright (C) 2001-2013 Kai Reinhard (k.reinhard@micromata.de)
//
// ProjectForge is dual-licensed.
//
// This community edition is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as published
// by the Free Software Foundation; version 3 of the License.
//
// This community edition is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
// Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, see http://www.gnu.org/licenses/.
//
/////////////////////////////////////////////////////////////////////////////

package org.projectforge.common;

import java.io.PrintWriter;
import java.io.StringWriter;

import org.apache.commons.lang.StringUtils;

/**
 * Some helper methods ...
 * @author Kai Reinhard (k.reinhard@micromata.de)
 */
public class ExceptionHelper {
    /**
     * Gets the stackTrace of the given message in the form "at
     * org.projectforge.access.AccessChecker.hasPermission(AccessChecker.java:79) at
     * org.projectforge.task.TaskDao.hasInsertAccess(TaskDao.java:176) at ..." without entries does not match the beginning of
     * only4Namespace. <br/> Also stack trace entries containing "CGLIB$$" will be ignored in the output.
     * @param ex
     * @param only4Namespace
     * @return
     */
    public static String getFilteredStackTrace(Throwable ex, String only4Namespace) {
        StringBuffer buf = new StringBuffer();
        StackTraceElement[] sta = ex.getStackTrace();
        boolean ignored = false;
        if (sta != null && sta.length > 0) {
            for (StackTraceElement ste : sta) {
                if (ignored == true) {
                    if (ignore(ste.getClassName(), only4Namespace) == true) {
                        continue;
                    }
                } else {
                    ignored = false;
                }
                if (ignore(ste.getClassName(), only4Namespace) == true) {
                    buf.append(" at ...");
                    ignored = true;
                    continue;
                }
                buf.append(" at ");
                buf.append(ste.toString());
            }
        }
        return buf.toString();
    }

    public static String printStackTrace(Throwable ex) {
        final StringWriter writer = new StringWriter();
        final PrintWriter pw = new PrintWriter(writer);
        ex.printStackTrace(pw);
        pw.flush();
        pw.close();
        return writer.toString();
    }

    /**
     * @param ex
     * @return the root cause or if not root cause exists, the exception itself.
     */
    public static Throwable getRootCause(Throwable ex) {
        if (ex.getCause() != null)
            return getRootCause(ex.getCause());
        return ex;
    }

    private static boolean ignore(String className, String only4Namespace) {
        return className.startsWith(only4Namespace) == false || StringUtils.contains(className, "CGLIB$$") == true;
    }
}