Fix offdevice compilation

Change-Id: I8bccccbc51b308fddfbbc990f7bfe1c490259372

1 files changed, 72 insertions, 0 deletions

diff --git a/native/jni/src/utils/log_utils.cpp b/native/jni/src/utils/log_utils.cpp
new file mode 100644
index 000000000..5ab2b2862
--- /dev/null
+++ b/native/jni/src/utils/log_utils.cpp
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2013, 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.
+ */
+
+#include "log_utils.h"
+
+#include <cstdio>
+#include <stdarg.h>
+
+#include "defines.h"
+
+namespace latinime {
+    /* static */ void LogUtils::logToJava(JNIEnv *const env, const char *const format, ...) {
+        static const char *TAG = "LatinIME:LogUtils";
+        const jclass androidUtilLogClass = env->FindClass("android/util/Log");
+        if (!androidUtilLogClass) {
+            // If we can't find the class, we are probably in off-device testing, and
+            // it's expected. Regardless, logging is not essential to functionality, so
+            // we should just return. However, FindClass has thrown an exception behind
+            // our back and there is no way to prevent it from doing that, so we clear
+            // the exception before we return.
+            env->ExceptionClear();
+            return;
+        }
+        const jmethodID logDotIMethodId = env->GetStaticMethodID(androidUtilLogClass, "i",
+                "(Ljava/lang/String;Ljava/lang/String;)I");
+        if (!logDotIMethodId) {
+            env->ExceptionClear();
+            if (androidUtilLogClass) env->DeleteLocalRef(androidUtilLogClass);
+            return;
+        }
+        const jstring javaTag = env->NewStringUTF(TAG);
+
+        static const int DEFAULT_LINE_SIZE = 128;
+        char fixedSizeCString[DEFAULT_LINE_SIZE];
+        va_list argList;
+        va_start(argList, format);
+        // Get the necessary size. Add 1 for the 0 terminator.
+        const int size = vsnprintf(fixedSizeCString, DEFAULT_LINE_SIZE, format, argList) + 1;
+        va_end(argList);
+
+        jstring javaString;
+        if (size <= DEFAULT_LINE_SIZE) {
+            // The buffer was large enough.
+            javaString = env->NewStringUTF(fixedSizeCString);
+        } else {
+            // The buffer was not large enough.
+            va_start(argList, format);
+            char variableSizeCString[size];
+            vsnprintf(variableSizeCString, size, format, argList);
+            va_end(argList);
+            javaString = env->NewStringUTF(variableSizeCString);
+        }
+
+        env->CallStaticIntMethod(androidUtilLogClass, logDotIMethodId, javaTag, javaString);
+        if (javaString) env->DeleteLocalRef(javaString);
+        if (javaTag) env->DeleteLocalRef(javaTag);
+        if (androidUtilLogClass) env->DeleteLocalRef(androidUtilLogClass);
+    }
+}