androidmedia: Add API to convert an exception into a string
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@ -42,6 +42,203 @@
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#include <string.h>
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#include <string.h>
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#include <jni.h>
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#include <jni.h>
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/* getExceptionSummary() and getStackTrace() taken from Android's
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* platform/libnativehelper/JNIHelp.cpp
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* Modified to work with normal C strings and without C++.
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*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Returns a human-readable summary of an exception object. The buffer will
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* be populated with the "binary" class name and, if present, the
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* exception message.
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*/
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static gchar *
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getExceptionSummary (JNIEnv * env, jthrowable exception)
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{
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GString *gs = g_string_new ("");
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jclass exceptionClass = NULL, classClass = NULL;
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jmethodID classGetNameMethod, getMessage;
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jstring classNameStr = NULL, messageStr = NULL;
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const char *classNameChars, *messageChars;
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/* get the name of the exception's class */
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exceptionClass = (*env)->GetObjectClass (env, exception);
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classClass = (*env)->GetObjectClass (env, exceptionClass);
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classGetNameMethod =
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(*env)->GetMethodID (env, classClass, "getName", "()Ljava/lang/String;");
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classNameStr =
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(jstring) (*env)->CallObjectMethod (env, exceptionClass,
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classGetNameMethod);
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if (classNameStr == NULL) {
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if ((*env)->ExceptionCheck (env))
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(*env)->ExceptionClear (env);
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g_string_append (gs, "<error getting class name>");
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goto done;
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}
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classNameChars = (*env)->GetStringUTFChars (env, classNameStr, NULL);
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if (classNameChars == NULL) {
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if ((*env)->ExceptionCheck (env))
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(*env)->ExceptionClear (env);
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g_string_append (gs, "<error getting class name UTF-8>");
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goto done;
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}
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g_string_append (gs, classNameChars);
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(*env)->ReleaseStringUTFChars (env, classNameStr, classNameChars);
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/* if the exception has a detail message, get that */
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getMessage =
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(*env)->GetMethodID (env, exceptionClass, "getMessage",
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"()Ljava/lang/String;");
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messageStr = (jstring) (*env)->CallObjectMethod (env, exception, getMessage);
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if (messageStr == NULL) {
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if ((*env)->ExceptionCheck (env))
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(*env)->ExceptionClear (env);
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goto done;
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}
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g_string_append (gs, ": ");
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messageChars = (*env)->GetStringUTFChars (env, messageStr, NULL);
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if (messageChars != NULL) {
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g_string_append (gs, messageChars);
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(*env)->ReleaseStringUTFChars (env, messageStr, messageChars);
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} else {
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if ((*env)->ExceptionCheck (env))
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(*env)->ExceptionClear (env);
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g_string_append (gs, "<error getting message>");
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}
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done:
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if (exceptionClass)
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(*env)->DeleteLocalRef (env, exceptionClass);
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if (classClass)
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(*env)->DeleteLocalRef (env, classClass);
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if (classNameStr)
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(*env)->DeleteLocalRef (env, classNameStr);
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if (messageStr)
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(*env)->DeleteLocalRef (env, messageStr);
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return g_string_free (gs, FALSE);
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}
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/*
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* Returns an exception (with stack trace) as a string.
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*/
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static gchar *
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getStackTrace (JNIEnv * env, jthrowable exception)
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{
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GString *gs = g_string_new ("");
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jclass stringWriterClass = NULL, printWriterClass = NULL;
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jclass exceptionClass = NULL;
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jmethodID stringWriterCtor, stringWriterToStringMethod;
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jmethodID printWriterCtor, printStackTraceMethod;
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jobject stringWriter = NULL, printWriter = NULL;
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jstring messageStr = NULL;
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const char *utfChars;
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stringWriterClass = (*env)->FindClass (env, "java/io/StringWriter");
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if (stringWriterClass == NULL) {
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g_string_append (gs, "<error getting java.io.StringWriter class>");
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goto done;
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}
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stringWriterCtor =
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(*env)->GetMethodID (env, stringWriterClass, "<init>", "()V");
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stringWriterToStringMethod =
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(*env)->GetMethodID (env, stringWriterClass, "toString",
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"()Ljava/lang/String;");
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printWriterClass = (*env)->FindClass (env, "java/io/PrintWriter");
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if (printWriterClass == NULL) {
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g_string_append (gs, "<error getting java.io.PrintWriter class>");
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goto done;
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}
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printWriterCtor =
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(*env)->GetMethodID (env, printWriterClass, "<init>",
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"(Ljava/io/Writer;)V");
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stringWriter = (*env)->NewObject (env, stringWriterClass, stringWriterCtor);
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if (stringWriter == NULL) {
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if ((*env)->ExceptionCheck (env))
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(*env)->ExceptionClear (env);
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g_string_append (gs, "<error creating new StringWriter instance>");
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goto done;
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}
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printWriter =
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(*env)->NewObject (env, printWriterClass, printWriterCtor, stringWriter);
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if (printWriter == NULL) {
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if ((*env)->ExceptionCheck (env))
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(*env)->ExceptionClear (env);
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g_string_append (gs, "<error creating new PrintWriter instance>");
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goto done;
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}
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exceptionClass = (*env)->GetObjectClass (env, exception);
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printStackTraceMethod =
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(*env)->GetMethodID (env, exceptionClass, "printStackTrace",
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"(Ljava/io/PrintWriter;)V");
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(*env)->CallVoidMethod (env, exception, printStackTraceMethod, printWriter);
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if ((*env)->ExceptionCheck (env)) {
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(*env)->ExceptionClear (env);
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g_string_append (gs, "<exception while printing stack trace>");
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goto done;
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}
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messageStr = (jstring) (*env)->CallObjectMethod (env, stringWriter,
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stringWriterToStringMethod);
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if (messageStr == NULL) {
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if ((*env)->ExceptionCheck (env))
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(*env)->ExceptionClear (env);
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g_string_append (gs, "<failed to call StringWriter.toString()>");
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goto done;
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}
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utfChars = (*env)->GetStringUTFChars (env, messageStr, NULL);
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if (utfChars == NULL) {
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if ((*env)->ExceptionCheck (env))
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(*env)->ExceptionClear (env);
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g_string_append (gs, "<failed to get UTF chars for message>");
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goto done;
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}
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(*env)->ReleaseStringUTFChars (env, messageStr, utfChars);
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done:
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if (stringWriterClass)
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(*env)->DeleteLocalRef (env, stringWriterClass);
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if (printWriterClass)
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(*env)->DeleteLocalRef (env, printWriterClass);
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if (exceptionClass)
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(*env)->DeleteLocalRef (env, exceptionClass);
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if (stringWriter)
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(*env)->DeleteLocalRef (env, stringWriter);
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if (printWriter)
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(*env)->DeleteLocalRef (env, printWriter);
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if (messageStr)
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(*env)->DeleteLocalRef (env, messageStr);
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return g_string_free (gs, FALSE);
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}
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#include <pthread.h>
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#include <pthread.h>
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GST_DEBUG_CATEGORY (gst_amc_debug);
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GST_DEBUG_CATEGORY (gst_amc_debug);
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