зеркало из https://github.com/mozilla/pjs.git
133 строки
3.7 KiB
C
133 строки
3.7 KiB
C
/* -*- Mode: C; tab-width: 8 -*-
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* Copyright (C) 1998 Netscape Communications Corporation, All Rights Reserved.
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*/
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/*
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* This file is part of the Java-vendor-neutral implementation of LiveConnect
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*
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* It contains the native code implementation of JS's JavaMember class.
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* JavaMember's are a strange beast required only to handle the special case
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* of a public field and a public method that appear in the same class and
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* have the same name. When such a field/method is used in Java, the compiler
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* can statically determine from context whether the field or the method is
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* being referenced, but that is not possible with JavaScript. For example:
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*
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* ambiguousVal = javaObj.fieldOrMethod; // ambiguousVal is a JavaMember object
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* a = ambiguousVal(); // ambiguousVal used as a method value
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* b = ambiguousVal + 4; // ambiguousVal used as a field value
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*
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* A JavaMember instance carries both the captured value of the Java field and
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* the method value until the context that the value is to be used in is known,
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* at which point conversion forces the use of one or the other.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "jsj_private.h" /* LiveConnect internals */
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/* Private, native portion of a JavaMember */
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typedef struct JavaMethodOrFieldValue {
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jsval method_val;
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jsval field_val;
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} JavaMethodOrFieldValue;
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JSObject *
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jsj_CreateJavaMember(JSContext *cx, jsval method_val, jsval field_val)
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{
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JavaMethodOrFieldValue *member_val;
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JSObject *JavaMember_obj;
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member_val = (JavaMethodOrFieldValue *)JS_malloc(cx, sizeof(*member_val));
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if (!member_val)
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return NULL;
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JavaMember_obj = JS_NewObject(cx, &JavaMember_class, 0, 0);
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if (!JavaMember_obj) {
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JS_free(cx, member_val);
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return NULL;
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}
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JS_SetPrivate(cx, JavaMember_obj, (void *)member_val);
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member_val->method_val = method_val;
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JS_AddRoot(cx, &member_val->method_val);
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member_val->field_val = field_val;
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if (JSVAL_IS_GCTHING(field_val))
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JS_AddRoot(cx, &member_val->field_val);
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return JavaMember_obj;
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}
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static void
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JavaMember_finalize(JSContext *cx, JSObject *obj)
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{
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JavaMethodOrFieldValue *member_val;
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JNIEnv *jEnv;
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jsj_MapJSContextToJSJThread(cx, &jEnv);
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if (!jEnv)
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return;
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member_val = JS_GetPrivate(cx, obj);
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if (!member_val)
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return;
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JS_RemoveRoot(cx, &member_val->method_val);
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if (JSVAL_IS_GCTHING(member_val->method_val))
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JS_RemoveRoot(cx, &member_val->method_val);
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JS_free(cx, member_val);
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}
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static JSBool
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JavaMember_convert(JSContext *cx, JSObject *obj, JSType type, jsval *vp)
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{
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JavaMethodOrFieldValue *member_val;
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member_val = JS_GetPrivate(cx, obj);
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if (!member_val) {
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if (type == JSTYPE_OBJECT) {
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*vp = OBJECT_TO_JSVAL(obj);
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return JS_TRUE;
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}
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JS_ReportError(cx, "illegal operation on JavaObject prototype object");
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return JS_FALSE;
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}
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switch (type) {
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case JSTYPE_VOID:
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case JSTYPE_STRING:
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case JSTYPE_NUMBER:
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case JSTYPE_BOOLEAN:
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case JSTYPE_OBJECT:
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*vp = member_val->field_val;
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return JS_TRUE;
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case JSTYPE_FUNCTION:
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*vp = member_val->method_val;
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return JS_TRUE;
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default:
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PR_ASSERT(0);
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return JS_FALSE;
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}
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}
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JSClass JavaMember_class = {
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"JavaMember", JSCLASS_HAS_PRIVATE,
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JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
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JS_EnumerateStub, JS_ResolveStub,
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JavaMember_convert, JavaMember_finalize
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};
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JSBool
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jsj_init_JavaMember(JSContext *cx, JSObject *global_obj)
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{
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if (!JS_InitClass(cx, global_obj,
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0, &JavaMember_class, 0, 0,
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0, 0,
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0, 0))
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return JS_FALSE;
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return JS_TRUE;
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}
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