Ant example source code file (BuildException.java)

This example Ant source code file (BuildException.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Ant tags/keywords

buildexception, buildexception, exception, exception, io, location, location, nested, runtimeexception, string, throwable, throwable

The BuildException.java source code

/*
 *  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
 *
 *      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 org.apache.tools.ant;

import java.io.PrintStream;
import java.io.PrintWriter;

/**
 * Signals an error condition during a build
 */
public class BuildException extends RuntimeException {

    /** Exception that might have caused this one. */
    private Throwable cause;

    /** Location in the build file where the exception occurred */
    private Location location = Location.UNKNOWN_LOCATION;

    /**
     * Constructs a build exception with no descriptive information.
     */
    public BuildException() {
        super();
    }

    /**
     * Constructs an exception with the given descriptive message.
     *
     * @param message A description of or information about the exception.
     *            Should not be <code>null.
     */
    public BuildException(String message) {
        super(message);
    }

    /**
     * Constructs an exception with the given message and exception as
     * a root cause.
     *
     * @param message A description of or information about the exception.
     *            Should not be <code>null unless a cause is specified.
     * @param cause The exception that might have caused this one.
     *              May be <code>null.
     */
    public BuildException(String message, Throwable cause) {
        super(message);
        this.cause = cause;
    }

    /**
     * Constructs an exception with the given message and exception as
     * a root cause and a location in a file.
     *
     * @param msg A description of or information about the exception.
     *            Should not be <code>null unless a cause is specified.
     * @param cause The exception that might have caused this one.
     *              May be <code>null.
     * @param location The location in the project file where the error
     *                 occurred. Must not be <code>null.
     */
    public BuildException(String msg, Throwable cause, Location location) {
        this(msg, cause);
        this.location = location;
    }

    /**
     * Constructs an exception with the given exception as a root cause.
     *
     * @param cause The exception that might have caused this one.
     *              Should not be <code>null.
     */
    public BuildException(Throwable cause) {
        super(cause.toString());
        this.cause = cause;
    }

    /**
     * Constructs an exception with the given descriptive message and a
     * location in a file.
     *
     * @param message A description of or information about the exception.
     *            Should not be <code>null.
     * @param location The location in the project file where the error
     *                 occurred. Must not be <code>null.
     */
    public BuildException(String message, Location location) {
        super(message);
        this.location = location;
    }

    /**
     * Constructs an exception with the given exception as
     * a root cause and a location in a file.
     *
     * @param cause The exception that might have caused this one.
     *              Should not be <code>null.
     * @param location The location in the project file where the error
     *                 occurred. Must not be <code>null.
     */
    public BuildException(Throwable cause, Location location) {
        this(cause);
        this.location = location;
    }

    /**
     * Returns the nested exception, if any.
     *
     * @return the nested exception, or <code>null if no
     *         exception is associated with this one
     */
    public Throwable getException() {
        return cause;
    }

    /**
     * Returns the nested exception, if any.
     *
     * @return the nested exception, or <code>null if no
     *         exception is associated with this one
     */
    public Throwable getCause() {
        return getException();
    }

    /**
     * Returns the location of the error and the error message.
     *
     * @return the location of the error and the error message
     */
    public String toString() {
        return location.toString() + getMessage();
    }

    /**
     * Sets the file location where the error occurred.
     *
     * @param location The file location where the error occurred.
     *                 Must not be <code>null.
     */
    public void setLocation(Location location) {
        this.location = location;
    }

    /**
     * Returns the file location where the error occurred.
     *
     * @return the file location where the error occurred.
     */
    public Location getLocation() {
        return location;
    }

    /**
     * Prints the stack trace for this exception and any
     * nested exception to <code>System.err.
     */
    public void printStackTrace() {
        printStackTrace(System.err);
    }

    /**
     * Prints the stack trace of this exception and any nested
     * exception to the specified PrintStream.
     *
     * @param ps The PrintStream to print the stack trace to.
     *           Must not be <code>null.
     */
    public void printStackTrace(PrintStream ps) {
        synchronized (ps) {
            super.printStackTrace(ps);
            if (cause != null) {
                ps.println("--- Nested Exception ---");
                cause.printStackTrace(ps);
            }
        }
    }

    /**
     * Prints the stack trace of this exception and any nested
     * exception to the specified PrintWriter.
     *
     * @param pw The PrintWriter to print the stack trace to.
     *           Must not be <code>null.
     */
    public void printStackTrace(PrintWriter pw) {
        synchronized (pw) {
            super.printStackTrace(pw);
            if (cause != null) {
                pw.println("--- Nested Exception ---");
                cause.printStackTrace(pw);
            }
        }
    }
}