Added Android builder juicy example

git-svn-id: svn://ultimatepp.org/upp/trunk@8640 f0d560ea-af0d-0410-9eb7-867de7ffcac7

examples/AndroidMath/MemoryManager.h

@@ -0,0 +1,71 @@
+#ifndef _JniMath_MemoryManager_h_
+#define _JniMath_MemoryManager_h_
+
+#include <jni.h>
+#include <string>
+#include <sstream>
+#include <vector>
+
+/**
+ * Java "HashCode()" object memory manager.
+ */
+template <class T>
+class MemoryManager {
+public:
+	void Insert(JNIEnv *env, jobject jobj, const T& obj)
+	{
+		std::string hashCode = GetJobjectHasCode(env, jobj);
+		if(!hashCode.empty()) {
+			hashCodes.push_back(hashCode);
+			values.push_back(obj);
+		}
+	}
+	
+	void Erase(JNIEnv *env, jobject jobj)
+	{
+		int idx = FindIdx(env, jobj);
+		if(idx >= 0) {
+			hashCodes.erase(hashCodes.begin() + idx);
+			values.erase(values.begin() + idx);
+		}
+	}
+	
+	T* Get(JNIEnv *env, jobject jobj)
+	{
+		int idx = FindIdx(env, jobj);
+		return idx != -1 ? &values[idx] : NULL;
+	}
+	
+private:
+	int FindIdx(JNIEnv *env, jobject jobj)
+	{
+		std::string hashCode = GetJobjectHasCode(env, jobj);
+		for(int i = 0; i < hashCodes.size(); i++) {
+			if(hashCode == hashCodes[i]) {
+				return i;
+			}
+		}
+		return -1;
+	}
+
+	std::string GetJobjectHasCode(JNIEnv *env, jobject jobj)
+	{
+		jclass cls = env->GetObjectClass(jobj);
+		jmethodID mid = env->GetMethodID(cls, "hashCode", "()I");
+		if(mid == 0) {
+			return "";
+		}
+		int ret = env->CallIntMethod(jobj, mid);
+	
+		std::stringstream ss;
+		ss << ret;
+	
+		return ss.str();
+	}
+
+private:
+	std::vector<std::string> hashCodes;
+	std::vector<T> values; 
+};
+
+#endif