package com.ibm; import java.io.PRintStream; import java.io.PrintWriter; public class ApplicationException extends Exception { /** A wrapped Throwable */ protected Throwable cause; public ApplicationException() { super("Error occurred in application."); } public ApplicationException (String message) { super(message); } public ApplicationException (String message, Throwable cause) { super(message); this.cause = cause; } // Created to match the JDK 1.4 Throwable method. public Throwable initCause(Throwable cause) { this.cause = cause; return cause; } public String getMessage() { // Get this exception's message. String msg = super.getMessage(); Throwable parent = this; Throwable child; // Look for nested exceptions. while((child = getNestedException(parent)) != null) { // Get the child's message. String msg2 = child.getMessage(); // If we found a message for the child exception, // we append it. if (msg2 != null) { if (msg != null) { msg += ": " + msg2; } else { msg = msg2; } } // Any nested ApplicationException will append its own // children, so we need to break out of here. if (child instanceof ApplicationException) { break; } parent = child; } // Return the completed message. return msg; } public void printStackTrace() { // Print the stack trace for this exception.
super.printStackTrace(); Throwable parent = this; Throwable child; // Print the stack trace for each nested exception. while((child = getNestedException (parent)) != null) {
if (child != null) { System.err.print("Caused by: "); child.printStackTrace();
if (child instanceof ApplicationException) {
break;
} parent = child; } } }
public void printStackTrace(PrintStream s) {
// Print the stack trace for this exception. super.printStackTrace(s); Throwable parent = this; Throwable child; // Print the stack trace for each nested exception. while((child = getNestedException (parent)) != null) { if (child != null) { s.print("Caused by: "); child.printStackTrace(s); if (child instanceof ApplicationException) { break; } parent = child; } } } public void printStackTrace(PrintWriter w) { // Print the stack trace for this exception. super.printStackTrace(w); Throwable parent = this; Throwable child; // Print the stack trace for each nested exception. while((child = getNestedException(parent)) != null) { if (child != null) { w.print("Caused by: "); child.printStackTrace(w); if (child instanceof ApplicationException) { break; } parent = child; } } } public Throwable getCause() { return cause; } }
package com.ibm.library; import com.ibm.ApplicationException; public class NoSuchBookException extends ApplicationException { public NoSuchBookException (String bookName, String libraryName) { super("The book '" + bookName + "' was not found in the '" + libraryName + "' library."); } }
