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/*
* Copyright (C) 2007 The Android Open Source Project
*
* 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.android.dx.util;
import java.io.PrintStream;
import java.io.PrintWriter;
/**
* Exception which carries around structured context.
*/
public class ExceptionWithContext
extends RuntimeException {
/** {@code non-null;} human-oriented context of the exception */
private StringBuffer context;
/**
* Augments the given exception with the given context, and return the
* result. The result is either the given exception if it was an
* {@link ExceptionWithContext}, or a newly-constructed exception if it
* was not.
*
* @param ex {@code non-null;} the exception to augment
* @param str {@code non-null;} context to add
* @return {@code non-null;} an appropriate instance
*/
public static ExceptionWithContext withContext(Throwable ex, String str) {
ExceptionWithContext ewc;
if (ex instanceof ExceptionWithContext) {
ewc = (ExceptionWithContext) ex;
} else {
ewc = new ExceptionWithContext(ex);
}
ewc.addContext(str);
return ewc;
}
/**
* Constructs an instance.
*
* @param message human-oriented message
*/
public ExceptionWithContext(String message) {
this(message, null);
}
/**
* Constructs an instance.
*
* @param cause {@code null-ok;} exception that caused this one
*/
public ExceptionWithContext(Throwable cause) {
this(null, cause);
}
/**
* Constructs an instance.
*
* @param message human-oriented message
* @param cause {@code null-ok;} exception that caused this one
*/
public ExceptionWithContext(String message, Throwable cause) {
super((message != null) ? message :
(cause != null) ? cause.getMessage() : null,
cause);
if (cause instanceof ExceptionWithContext) {
String ctx = ((ExceptionWithContext) cause).context.toString();
context = new StringBuffer(ctx.length() + 200);
context.append(ctx);
} else {
context = new StringBuffer(200);
}
}
/** {@inheritDoc} */
@Override
public void printStackTrace(PrintStream out) {
super.printStackTrace(out);
out.println(context);
}
/** {@inheritDoc} */
@Override
public void printStackTrace(PrintWriter out) {
super.printStackTrace(out);
out.println(context);
}
/**
* Adds a line of context to this instance.
*
* @param str {@code non-null;} new context
*/
public void addContext(String str) {
if (str == null) {
throw new NullPointerException("str == null");
}
context.append(str);
if (!str.endsWith("\n")) {
context.append('\n');
}
}
/**
* Gets the context.
*
* @return {@code non-null;} the context
*/
public String getContext() {
return context.toString();
}
/**
* Prints the message and context.
*
* @param out {@code non-null;} where to print to
*/
public void printContext(PrintStream out) {
out.println(getMessage());
out.print(context);
}
/**
* Prints the message and context.
*
* @param out {@code non-null;} where to print to
*/
public void printContext(PrintWriter out) {
out.println(getMessage());
out.print(context);
}
}
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