Java Throwable to String stackTraceToString(Throwable t)

Description

Print exception stack trace to string if allowed.

License

Apache License

Parameter

Parameter	Description
t	exception to print

Return

string with exception or null if stack trace printing disabled

Declaration

public static String stackTraceToString(Throwable t) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *  /*from ww  w.  jav a 2  s.c  om*/
 *   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.
 *  
 *******************************************************************************/

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

public class Main {
    private static final int MAX_CHARS = 20000;
    private static final boolean PRINT_STACK_TRACE = true;

    /**
     * Print exception stack trace to string if allowed.
     * 
     * @param t exception to print
     * @return string with exception or null if stack trace printing disabled
     */
    public static String stackTraceToString(Throwable t) {
        if (PRINT_STACK_TRACE) {
            StringWriter descr = new StringWriter() {
                boolean writeOK = true;

                public void write(char[] cbuf, int off, int len) {
                    if (canWrite())
                        super.write(cbuf, off, len);
                }

                public void write(int c) {
                    if (canWrite())
                        super.write(c);
                }

                public void write(String str, int off, int len) {
                    if (canWrite())
                        super.write(str, off, len);
                }

                public void write(String str) {
                    if (canWrite())
                        super.write(str);
                }

                private boolean canWrite() {
                    if (writeOK && this.getBuffer().length() > MAX_CHARS) {
                        super.write(" ... [ too long - truncated ]"); //$NON-NLS-1$
                        writeOK = false;
                    }
                    return writeOK;
                }
            };
            t.printStackTrace(new PrintWriter(descr));
            return descr.toString();
        } else {
            return null;
        }
    }

    /**
     * Converts throwable to string.
     * 
     * @param t the throwable to be converted
     * @return string serialization of the throwable
     */
    public static String toString(Throwable t) {
        String s = stackTraceToString(t);
        if (s == null)
            s = "Exception " + t.getClass().getName() + " : " + t.getMessage(); //$NON-NLS-1$ //$NON-NLS-2$
        return s;
    }
}

Related

1. stackTraceToString(Throwable e)
2. stackTraceToString(Throwable eIn)
3. stackTraceToString(Throwable ex)
4. StackTraceToString(Throwable ex)
5. stackTraceToString(Throwable t)
6. stacktraceToString(Throwable t)
7. stackTraceToString(Throwable t)
8. stackTraceToString(Throwable t)
9. stackTraceToString(Throwable th)