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187 lines (164 loc) · 4.8 KB
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/*
* Copyright (c) 2004, 2005, 2006 TADA AB - Taby Sweden
* Distributed under the terms shown in the file COPYRIGHT
* found in the root folder of this project or at
* http://eng.tada.se/osprojects/COPYRIGHT.html
*
* @author Thomas Hallgren
*/
#include <postgres.h>
#include <executor/spi.h>
#include "pljava/PgObject_priv.h"
#include "pljava/type/String.h"
static bool s_loopLock = false;
static jclass s_Class_class = 0;
static jmethodID s_Class_getName = 0;
/* effectiveClassPath is set at initialization time (in Backend.c)
*/
const char* effectiveClassPath;
void PgObject_free(PgObject object)
{
Finalizer finalizer = object->m_class->finalize;
if(finalizer != 0)
finalizer(object);
pfree(object);
}
PgObject PgObjectClass_allocInstance(PgObjectClass clazz, MemoryContext ctx)
{
Size sz = clazz->instanceSize;
PgObject infant = (PgObject)MemoryContextAlloc(ctx, sz);
memset(infant, 0, sz);
infant->m_class = clazz;
return infant;
}
void PgObjectClass_init(PgObjectClass clazz, const char* name, Size instanceSize, Finalizer finalizer)
{
clazz->name = name;
clazz->instanceSize = instanceSize;
clazz->finalize = finalizer;
}
PgObjectClass PgObjectClass_create(const char* name, Size instanceSize, Finalizer finalizer)
{
PgObjectClass self = (PgObjectClass)MemoryContextAlloc(TopMemoryContext, sizeof(struct PgObjectClass_));
memset(self, 0, sizeof(struct PgObjectClass_));
PgObjectClass_init(self, name, instanceSize, finalizer);
return self;
}
PgObjectClass PgObject_getClass(PgObject self)
{
return self->m_class;
}
const char* PgObjectClass_getName(PgObjectClass self)
{
return self->name;
}
void _PgObject_pureVirtualCalled(PgObject object)
{
ereport(ERROR, (errmsg("Pure virtual method called")));
}
static char* PgObject_getClassName(jclass cls)
{
jstring jstr;
char* tmp;
if(s_Class_getName == 0)
{
if(s_loopLock)
return "<exception while obtaining Class.getName()>";
s_loopLock = true;
s_Class_class = (jclass)JNI_newGlobalRef(PgObject_getJavaClass("java/lang/Class"));
s_Class_getName = PgObject_getJavaMethod(s_Class_class, "getName", "()Ljava/lang/String;");
s_loopLock = false;
}
jstr = (jstring)JNI_callObjectMethod(cls, s_Class_getName);
tmp = String_createNTS(jstr);
JNI_deleteLocalRef(jstr);
return tmp;
}
void PgObject_throwMemberError(jclass cls, const char* memberName, const char* signature, bool isMethod, bool isStatic)
{
JNI_exceptionDescribe();
JNI_exceptionClear();
ereport(ERROR, (
errmsg("Unable to find%s %s %s.%s with signature %s",
(isStatic ? " static" : ""),
(isMethod ? "method" : "field"),
PgObject_getClassName(cls),
memberName,
signature)));
}
jclass PgObject_getJavaClass(const char* className)
{
jclass cls = JNI_findClass(className);
if(cls == 0)
{
if(JNI_exceptionCheck())
{
JNI_exceptionDescribe();
JNI_exceptionClear();
}
ereport(ERROR, (
errmsg("Unable to load class %s using CLASSPATH '%s'",
className, effectiveClassPath == 0 ? "null" : effectiveClassPath)));
}
return cls;
}
void PgObject_registerNatives(const char* className, JNINativeMethod* methods)
{
jclass cls = PgObject_getJavaClass(className);
PgObject_registerNatives2(cls, methods);
JNI_deleteLocalRef(cls);
}
void PgObject_registerNatives2(jclass cls, JNINativeMethod* methods)
{
#ifndef GCJ
jint nMethods = 0;
JNINativeMethod* m = methods;
while(m->name != 0)
{
m++;
nMethods++;
}
if(JNI_registerNatives(cls, methods, nMethods) != 0)
{
JNI_exceptionDescribe();
JNI_exceptionClear();
ereport(ERROR, (
errmsg("Unable to register native methods")));
}
#endif
}
jmethodID PgObject_getJavaMethod(jclass cls, const char* methodName, const char* signature)
{
jmethodID m = JNI_getMethodID(cls, methodName, signature);
if(m == 0)
PgObject_throwMemberError(cls, methodName, signature, true, false);
return m;
}
jmethodID PgObject_getStaticJavaMethod(jclass cls, const char* methodName, const char* signature)
{
jmethodID m = JNI_getStaticMethodID(cls, methodName, signature);
if(m == 0)
PgObject_throwMemberError(cls, methodName, signature, true, true);
return m;
}
jfieldID PgObject_getJavaField(jclass cls, const char* fieldName, const char* signature)
{
jfieldID m = JNI_getFieldID(cls, fieldName, signature);
if(m == 0)
PgObject_throwMemberError(cls, fieldName, signature, false, false);
return m;
}
jfieldID PgObject_getStaticJavaField(jclass cls, const char* fieldName, const char* signature)
{
jfieldID m = JNI_getStaticFieldID(cls, fieldName, signature);
if(m == 0)
PgObject_throwMemberError(cls, fieldName, signature, false, true);
return m;
}
HeapTuple PgObject_getValidTuple(int cacheId, Oid tupleId, const char* tupleType)
{
HeapTuple tuple = SearchSysCache(cacheId, ObjectIdGetDatum(tupleId), 0, 0, 0);
if(!HeapTupleIsValid(tuple))
ereport(ERROR, (errmsg("cache lookup failed for %s %u", tupleType, tupleId)));
return tuple;
}