Be able to create a wrapper for java.

Android is a specific wrapper.
Java is another one.

src/wrapper/java/book.cpp

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2020 Matthieu Gautier <mgautier@kymeria.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU  General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+
+#include <jni.h>
+#include "org_kiwix_kiwixlib_Book.h"
+
+#include "utils.h"
+#include "book.h"
+
+JNIEXPORT void JNICALL
+Java_org_kiwix_kiwixlib_Book_allocate(
+  JNIEnv* env, jobject thisObj)
+{
+  allocate<kiwix::Book>(env, thisObj);
+}
+
+JNIEXPORT void JNICALL
+Java_org_kiwix_kiwixlib_Book_dispose(JNIEnv* env, jobject thisObj)
+{
+  dispose<kiwix::Book>(env, thisObj);
+}
+
+#define BOOK (getPtr<kiwix::Book>(env, thisObj))
+
+#define GETTER(retType, name) JNIEXPORT retType JNICALL \
+Java_org_kiwix_kiwixlib_Book_##name (JNIEnv* env, jobject thisObj) \
+{ \
+  auto cRet = BOOK->name(); \
+  retType ret = c2jni(cRet, env); \
+  return ret; \
+}
+
+GETTER(jstring, getId)
+GETTER(jstring, getPath)
+GETTER(jboolean, isPathValid)
+GETTER(jstring, getTitle)
+GETTER(jstring, getDescription)
+GETTER(jstring, getLanguage)
+GETTER(jstring, getCreator)
+GETTER(jstring, getPublisher)
+GETTER(jstring, getDate)
+GETTER(jstring, getUrl)
+GETTER(jstring, getName)
+GETTER(jstring, getTags)
+GETTER(jlong, getArticleCount)
+GETTER(jlong, getMediaCount)
+GETTER(jlong, getSize)
+GETTER(jstring, getFavicon)
+GETTER(jstring, getFaviconUrl)
+GETTER(jstring, getFaviconMimeType)
+
+#undef GETTER