io.honeybadger.com.jcabi.log.ExceptionDecor Maven / Gradle / Ivy
/**
* Copyright (c) 2012-2014, jcabi.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met: 1) Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer. 2) Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution. 3) Neither the name of the jcabi.com nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jcabi.log;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Formattable;
import java.util.FormattableFlags;
import java.util.Formatter;
import lombok.EqualsAndHashCode;
import lombok.ToString;
/**
* Decorates an exception.
*
* For example:
*
*
* try {
* // ...
* } catch (final IOException ex) {
* Logger.error("failed to open file: %[exception]s", ex);
* throw new IllegalArgumentException(ex);
* }
*
*
* @author Yegor Bugayenko ([email protected])
* @version $Id$
* @since 0.1
*/
@ToString
@EqualsAndHashCode(of = "throwable")
final class ExceptionDecor implements Formattable {
/**
* The exception.
*/
private final transient Throwable throwable;
/**
* Public ctor.
* @param thr The exception
*/
ExceptionDecor(final Throwable thr) {
this.throwable = thr;
}
/**
* {@inheritDoc}
* @checkstyle ParameterNumber (4 lines)
*/
@Override
public void formatTo(final Formatter formatter, final int flags,
final int width, final int precision) {
final String text;
if (this.throwable == null) {
text = "NULL";
} else if ((flags & FormattableFlags.ALTERNATE) == 0) {
final StringWriter writer = new StringWriter();
this.throwable.printStackTrace(new PrintWriter(writer));
text = writer.toString();
} else {
text = this.throwable.getMessage();
}
formatter.format("%s", text);
}
}