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Added the ability to track who is throwing exceptions and how often in the core library. Uncomment to enable it.
git-svn-id: https://zxing.googlecode.com/svn/trunk@1155 59b500cc-1b3d-0410-9834-0bbf25fbcc57
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@ -36,14 +36,58 @@ public final class ReaderException extends Exception {
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private static final ReaderException instance = new ReaderException();
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// EXCEPTION TRACKING SUPPORT
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// Identifies who is throwing exceptions and how often. To use:
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//
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// 1. Uncomment these lines and the code below which uses them.
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// 2. Uncomment the two corresponding lines in j2se/CommandLineRunner.decode()
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// 3. Change core to build as Java 1.5 temporarily
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// private static int exceptionCount = 0;
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// private static Map<String,Integer> throwers = new HashMap<String,Integer>(32);
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private ReaderException() {
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// do nothing
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}
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public static ReaderException getInstance() {
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// Exception e = new Exception();
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// // Take the stack frame before this one.
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// StackTraceElement stack = e.getStackTrace()[1];
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// String key = stack.getClassName() + "." + stack.getMethodName() + "(), line " +
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// stack.getLineNumber();
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// if (throwers.containsKey(key)) {
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// Integer value = throwers.get(key);
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// value++;
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// throwers.put(key, value);
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// } else {
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// throwers.put(key, 1);
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// }
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// exceptionCount++;
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return instance;
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}
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// public static int getExceptionCountAndReset() {
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// int temp = exceptionCount;
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// exceptionCount = 0;
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// return temp;
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// }
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//
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// public static String getThrowersAndReset() {
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// StringBuilder builder = new StringBuilder(1024);
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// Object[] keys = throwers.keySet().toArray();
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// for (int x = 0; x < keys.length; x++) {
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// String key = (String) keys[x];
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// Integer value = throwers.get(key);
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// builder.append(key);
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// builder.append(": ");
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// builder.append(value);
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// builder.append("\n");
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// }
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// throwers.clear();
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// return builder.toString();
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// }
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// Prevent stack traces from being taken
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// srowen says: huh, my IDE is saying this is not an override. native methods can't be overridden?
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// This, at least, does not hurt. Because we use a singleton pattern here, it doesn't matter anyhow.
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@ -200,6 +200,10 @@ public final class CommandLineRunner {
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} catch (ReaderException e) {
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System.out.println(uri.toString() + ": No barcode found");
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return null;
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} finally {
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// Uncomment these lines when turning on exception tracking in ReaderException.
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//System.out.println("Threw " + ReaderException.getExceptionCountAndReset() + " exceptions");
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//System.out.println("Throwers:\n" + ReaderException.getThrowersAndReset());
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}
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}
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