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-rw-r--r--src/java/Class.hxx83
-rw-r--r--src/java/Exception.hxx49
-rw-r--r--src/java/File.cxx67
-rw-r--r--src/java/File.hxx66
-rw-r--r--src/java/Global.cxx39
-rw-r--r--src/java/Global.hxx58
-rw-r--r--src/java/Object.hxx55
-rw-r--r--src/java/Ref.hxx181
-rw-r--r--src/java/String.cxx44
-rw-r--r--src/java/String.hxx75
10 files changed, 717 insertions, 0 deletions
diff --git a/src/java/Class.hxx b/src/java/Class.hxx
new file mode 100644
index 000000000..9496ee67d
--- /dev/null
+++ b/src/java/Class.hxx
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2010-2011 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef JAVA_CLASS_HXX
+#define JAVA_CLASS_HXX
+
+#include "Ref.hxx"
+
+#include <assert.h>
+
+namespace Java {
+ /**
+ * Wrapper for a local "jclass" reference.
+ */
+ class Class : public Java::LocalRef<jclass> {
+ public:
+ Class(JNIEnv *env, jclass cls)
+ :LocalRef<jclass>(env, cls) {}
+
+ Class(JNIEnv *env, const char *name)
+ :LocalRef<jclass>(env, env->FindClass(name)) {}
+ };
+
+ /**
+ * Wrapper for a global "jclass" reference.
+ */
+ class TrivialClass : public TrivialRef<jclass> {
+ public:
+ void Find(JNIEnv *env, const char *name) {
+ assert(env != nullptr);
+ assert(name != nullptr);
+
+ jclass cls = env->FindClass(name);
+ assert(cls != nullptr);
+
+ Set(env, cls);
+ env->DeleteLocalRef(cls);
+ }
+
+ bool FindOptional(JNIEnv *env, const char *name) {
+ assert(env != nullptr);
+ assert(name != nullptr);
+
+ jclass cls = env->FindClass(name);
+ if (cls == nullptr) {
+ env->ExceptionClear();
+ return false;
+ }
+
+ Set(env, cls);
+ env->DeleteLocalRef(cls);
+ return true;
+ }
+ };
+}
+
+#endif
diff --git a/src/java/Exception.hxx b/src/java/Exception.hxx
new file mode 100644
index 000000000..adbdebb47
--- /dev/null
+++ b/src/java/Exception.hxx
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2010-2012 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef JAVA_EXCEPTION_HXX
+#define JAVA_EXCEPTION_HXX
+
+#include <jni.h>
+
+namespace Java {
+ /**
+ * Check if an exception has occurred, and discard it.
+ *
+ * @return true if an exception was found (and discarded)
+ */
+ static inline bool DiscardException(JNIEnv *env) {
+ bool result = env->ExceptionCheck();
+ if (result)
+ env->ExceptionClear();
+ return result;
+ }
+}
+
+#endif
diff --git a/src/java/File.cxx b/src/java/File.cxx
new file mode 100644
index 000000000..8e9599dfc
--- /dev/null
+++ b/src/java/File.cxx
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2010-2014 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "File.hxx"
+#include "Class.hxx"
+#include "String.hxx"
+#include "Object.hxx"
+#include "fs/AllocatedPath.hxx"
+#include "fs/Limits.hxx"
+
+jmethodID Java::File::getAbsolutePath_method;
+
+void
+Java::File::Initialise(JNIEnv *env)
+{
+ Class cls(env, "java/io/File");
+
+ getAbsolutePath_method = env->GetMethodID(cls, "getAbsolutePath",
+ "()Ljava/lang/String;");
+}
+
+AllocatedPath
+Java::File::ToAbsolutePath(JNIEnv *env, jobject _file)
+{
+ assert(env != nullptr);
+ assert(_file != nullptr);
+
+ LocalObject file(env, _file);
+
+ const jstring path = getAbsolutePath(env, file);
+ if (path == nullptr) {
+ env->ExceptionClear();
+ return AllocatedPath::Null();
+ }
+
+ Java::String path2(env, path);
+ char buffer[MPD_PATH_MAX];
+ path2.CopyTo(env, buffer, sizeof(buffer));
+ return AllocatedPath::FromUTF8(buffer);
+}
diff --git a/src/java/File.hxx b/src/java/File.hxx
new file mode 100644
index 000000000..a569fe214
--- /dev/null
+++ b/src/java/File.hxx
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2010-2014 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef JAVA_FILE_HXX
+#define JAVA_FILE_HXX
+
+#include "Object.hxx"
+
+#include <jni.h>
+
+class AllocatedPath;
+
+namespace Java {
+ /**
+ * Wrapper for a java.io.File object.
+ */
+ class File : public LocalObject {
+ static jmethodID getAbsolutePath_method;
+
+ public:
+ gcc_nonnull_all
+ static void Initialise(JNIEnv *env);
+
+ gcc_nonnull_all
+ static jstring getAbsolutePath(JNIEnv *env, jobject file) {
+ return (jstring)env->CallObjectMethod(file,
+ getAbsolutePath_method);
+ }
+
+ /**
+ * Invoke File.getAbsolutePath() and release the
+ * specified File reference.
+ */
+ gcc_pure gcc_nonnull_all
+ static AllocatedPath ToAbsolutePath(JNIEnv *env,
+ jobject file);
+ };
+}
+
+#endif
diff --git a/src/java/Global.cxx b/src/java/Global.cxx
new file mode 100644
index 000000000..1d1160127
--- /dev/null
+++ b/src/java/Global.cxx
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2010-2011 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "Global.hxx"
+
+namespace Java {
+ JavaVM *jvm;
+
+ void Init(JNIEnv *env)
+ {
+ env->GetJavaVM(&jvm);
+ }
+}
diff --git a/src/java/Global.hxx b/src/java/Global.hxx
new file mode 100644
index 000000000..5fdf91daf
--- /dev/null
+++ b/src/java/Global.hxx
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2010-2011 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef JAVA_GLOBAL_HXX
+#define JAVA_GLOBAL_HXX
+
+#include "Compiler.h"
+
+#include <jni.h>
+
+namespace Java {
+ extern JavaVM *jvm;
+
+ void Init(JNIEnv *env);
+
+ static inline void
+ DetachCurrentThread()
+ {
+ if (jvm != nullptr)
+ jvm->DetachCurrentThread();
+ }
+
+ static inline gcc_pure
+ JNIEnv *GetEnv()
+ {
+ JNIEnv *env;
+ jvm->AttachCurrentThread(&env, nullptr);
+ return env;
+ }
+}
+
+#endif
diff --git a/src/java/Object.hxx b/src/java/Object.hxx
new file mode 100644
index 000000000..226ad7623
--- /dev/null
+++ b/src/java/Object.hxx
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2010-2011 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef JAVA_OBJECT_HXX
+#define JAVA_OBJECT_HXX
+
+#include "Ref.hxx"
+
+#include <jni.h>
+
+namespace Java {
+ /**
+ * Wrapper for a local "jobject" reference.
+ */
+ typedef LocalRef<jobject> LocalObject;
+
+ class Object : public GlobalRef<jobject> {
+ public:
+ /**
+ * Constructs an uninitialized object. The method
+ * set() must be called before it is destructed.
+ */
+ Object() = default;
+
+ Object(JNIEnv *env, jobject obj):GlobalRef<jobject>(env, obj) {}
+ };
+}
+
+#endif
diff --git a/src/java/Ref.hxx b/src/java/Ref.hxx
new file mode 100644
index 000000000..e9966f1c6
--- /dev/null
+++ b/src/java/Ref.hxx
@@ -0,0 +1,181 @@
+/*
+ * Copyright (C) 2010-2011 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef JAVA_REF_HXX
+#define JAVA_REF_HXX
+
+#include "Global.hxx"
+
+#include <jni.h>
+
+#include <assert.h>
+
+namespace Java {
+ /**
+ * Hold a local reference on a JNI object.
+ */
+ template<typename T>
+ class LocalRef {
+ JNIEnv *const env;
+ const T value;
+
+ public:
+ /**
+ * The local reference is obtained by the caller.
+ */
+ LocalRef(JNIEnv *_env, T _value):env(_env), value(_value) {
+ assert(env != nullptr);
+ assert(value != nullptr);
+ }
+
+ ~LocalRef() {
+ env->DeleteLocalRef(value);
+ }
+
+ LocalRef(const LocalRef &other) = delete;
+ LocalRef &operator=(const LocalRef &other) = delete;
+
+ T Get() const {
+ return value;
+ }
+
+ operator T() const {
+ return value;
+ }
+ };
+
+ /**
+ * Hold a global reference on a JNI object.
+ */
+ template<typename T>
+ class GlobalRef {
+ T value;
+
+ public:
+ /**
+ * Constructs an uninitialized object. The method set() must be
+ * called before it is destructed.
+ */
+ GlobalRef() = default;
+
+ GlobalRef(JNIEnv *env, T _value):value(_value) {
+ assert(env != nullptr);
+ assert(value != nullptr);
+
+ value = (T)env->NewGlobalRef(value);
+ }
+
+ ~GlobalRef() {
+ GetEnv()->DeleteGlobalRef(value);
+ }
+
+ GlobalRef(const GlobalRef &other) = delete;
+ GlobalRef &operator=(const GlobalRef &other) = delete;
+
+ /**
+ * Sets the object, ignoring the previous value. This is only
+ * allowed once after the default constructor was used.
+ */
+ void Set(JNIEnv *env, T _value) {
+ assert(_value != nullptr);
+
+ value = (T)env->NewGlobalRef(_value);
+ }
+
+ T Get() const {
+ return value;
+ }
+
+ operator T() const {
+ return value;
+ }
+ };
+
+ /**
+ * Container for a global reference to a JNI object that gets
+ * initialised and deinitialised explicitly. Since there is no
+ * implicit initialisation in the default constructor, this is a
+ * trivial C++ class. It should only be used for global variables
+ * that are implicitly initialised with zeroes.
+ */
+ template<typename T>
+ class TrivialRef {
+ T value;
+
+ public:
+ constexpr TrivialRef() {};
+
+ TrivialRef(const TrivialRef &other) = delete;
+ TrivialRef &operator=(const TrivialRef &other) = delete;
+
+ bool IsDefined() const {
+ return value != nullptr;
+ }
+
+ /**
+ * Obtain a global reference on the specified object and store it.
+ * This object must not be set already.
+ */
+ void Set(JNIEnv *env, T _value) {
+ assert(value == nullptr);
+ assert(_value != nullptr);
+
+ value = (T)env->NewGlobalRef(_value);
+ }
+
+ /**
+ * Release the global reference and clear this object.
+ */
+ void Clear(JNIEnv *env) {
+ assert(value != nullptr);
+
+ env->DeleteGlobalRef(value);
+ value = nullptr;
+ }
+
+ /**
+ * Release the global reference and clear this object. It is
+ * allowed to call this method without ever calling Set().
+ */
+ void ClearOptional(JNIEnv *env) {
+ if (value != nullptr)
+ Clear(env);
+ }
+
+ T Get() const {
+ return value;
+ }
+
+ operator T() const {
+ return value;
+ }
+ };
+}
+
+#endif
diff --git a/src/java/String.cxx b/src/java/String.cxx
new file mode 100644
index 000000000..8ffb82d72
--- /dev/null
+++ b/src/java/String.cxx
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2010-2011 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "String.hxx"
+#include "util/StringUtil.hxx"
+
+char *
+Java::String::CopyTo(JNIEnv *env, jstring value,
+ char *buffer, size_t max_size)
+{
+ const char *p = env->GetStringUTFChars(value, nullptr);
+ if (p == nullptr)
+ return nullptr;
+
+ char *result = CopyString(buffer, p, max_size);
+ env->ReleaseStringUTFChars(value, p);
+ return result;
+}
diff --git a/src/java/String.hxx b/src/java/String.hxx
new file mode 100644
index 000000000..a58385f50
--- /dev/null
+++ b/src/java/String.hxx
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2010-2011 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef JAVA_STRING_HXX
+#define JAVA_STRING_HXX
+
+#include "Ref.hxx"
+
+#include <jni.h>
+
+#include <assert.h>
+#include <stddef.h>
+
+namespace Java {
+ /**
+ * Wrapper for a local "jstring" reference.
+ */
+ class String : public LocalRef<jstring> {
+ public:
+ String(JNIEnv *env, jstring value)
+ :LocalRef<jstring>(env, value) {}
+
+ String(JNIEnv *_env, const char *_value)
+ :LocalRef<jstring>(_env, _env->NewStringUTF(_value)) {}
+
+ /**
+ * Copy the value to the specified buffer. Truncates
+ * the value if it does not fit into the buffer.
+ *
+ * @return a pointer to the terminating null byte,
+ * nullptr on error
+ */
+ static char *CopyTo(JNIEnv *env, jstring value,
+ char *buffer, size_t max_size);
+
+ /**
+ * Copy the value to the specified buffer. Truncates
+ * the value if it does not fit into the buffer.
+ *
+ * @return a pointer to the terminating null byte,
+ * nullptr on error
+ */
+ char *CopyTo(JNIEnv *env, char *buffer, size_t max_size) {
+ return CopyTo(env, Get(), buffer, max_size);
+ }
+ };
+}
+
+#endif