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/*
 * Copyright 2010 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.gwt.logging.impl;

import com.google.gwt.core.client.impl.SerializableThrowable;

import java.util.Date;
import java.util.HashSet;
import java.util.logging.Formatter;
import java.util.logging.LogRecord;

/**
 * Base class for Formatters - provides common functionality.
 */
public abstract class FormatterImpl extends Formatter {

  /**
   * Note that this format is likely to change in the future.
   * Outputs the meta information in the log record in the following format:
   * 
Date LoggerName\nLEVEL:
* Most formatters will append the message right after the colon */ protected String getRecordInfo(LogRecord event, String newline) { Date date = new Date(event.getMillis()); StringBuilder s = new StringBuilder(); s.append(date.toString()); s.append(" "); s.append(event.getLoggerName()); s.append(newline); s.append(event.getLevel().getName()); s.append(": "); return s.toString(); } // This method is borrowed from AbstractTreeLogger. // TODO(unnurg): once there is a clear place where code used by gwt-dev and // gwt-user can live, move this function there. protected String getStackTraceAsString(Throwable e, String newline, String indent) { if (e == null) { return ""; } // For each cause, print the requested number of entries of its stack // trace, being careful to avoid getting stuck in an infinite loop. // StringBuffer s = new StringBuffer(newline); Throwable currentCause = e; String causedBy = ""; HashSet seenCauses = new HashSet(); while (currentCause != null && !seenCauses.contains(currentCause)) { seenCauses.add(currentCause); s.append(causedBy); causedBy = newline + "Caused by: "; // after 1st, all say "caused by" if (currentCause instanceof SerializableThrowable.ThrowableWithClassName) { s.append(((SerializableThrowable.ThrowableWithClassName) currentCause).getExceptionClass()); } else { s.append(currentCause.getClass().getName()); } s.append(": " + currentCause.getMessage()); StackTraceElement[] stackElems = currentCause.getStackTrace(); if (stackElems != null) { for (int i = 0; i < stackElems.length; ++i) { s.append(newline + indent + "at "); s.append(stackElems[i].toString()); } } currentCause = currentCause.getCause(); } return s.toString(); } }




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