WebCore/bridge/jni/JNIBridge.cpp

/*
 * Copyright (C) 2003, 2004, 2005, 2007, 2009 Apple Inc. All rights reserved.
 * Copyright 2010, The Android Open Source Project
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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 APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 "JNIBridge.h"

#if ENABLE(MAC_JAVA_BRIDGE)

#include "CString.h"
#include "StringBuilder.h"


using namespace JSC;
using namespace JSC::Bindings;
using namespace WebCore;


JavaParameter::JavaParameter(JNIEnv* env, jstring type)
{
    m_type = JavaString(env, type);
    m_JNIType = JNITypeFromClassName(m_type.UTF8String());
}

JavaMethod::JavaMethod(JNIEnv* env, jobject aMethod)
{
    // Get return type name
    jstring returnTypeName = 0;
    if (jobject returnType = callJNIMethod<jobject>(aMethod, "getReturnType", "()Ljava/lang/Class;")) {
            returnTypeName = static_cast<jstring>(callJNIMethod<jobject>(returnType, "getName", "()Ljava/lang/String;"));
        if (!returnTypeName)
            returnTypeName = env->NewStringUTF("<Unknown>");
        env->DeleteLocalRef(returnType);
    }
    m_returnType = JavaString(env, returnTypeName);
    m_JNIReturnType = JNITypeFromClassName(m_returnType.UTF8String());
    env->DeleteLocalRef(returnTypeName);

    // Get method name
    jstring methodName = static_cast<jstring>(callJNIMethod<jobject>(aMethod, "getName", "()Ljava/lang/String;"));
    if (!returnTypeName)
        returnTypeName = env->NewStringUTF("<Unknown>");
    m_name = JavaString(env, methodName);
    env->DeleteLocalRef(methodName);

    // Get parameters
    if (jarray jparameters = static_cast<jarray>(callJNIMethod<jobject>(aMethod, "getParameterTypes", "()[Ljava/lang/Class;"))) {
        m_numParameters = env->GetArrayLength(jparameters);
        m_parameters = new JavaParameter[m_numParameters];

        for (int i = 0; i < m_numParameters; i++) {
            jobject aParameter = env->GetObjectArrayElement(static_cast<jobjectArray>(jparameters), i);
            jstring parameterName = static_cast<jstring>(callJNIMethod<jobject>(aParameter, "getName", "()Ljava/lang/String;"));
            if (!parameterName)
                parameterName = env->NewStringUTF("<Unknown>");
            m_parameters[i] = JavaParameter(env, parameterName);
            env->DeleteLocalRef(aParameter);
            env->DeleteLocalRef(parameterName);
        }
        env->DeleteLocalRef(jparameters);
    } else {
        m_numParameters = 0;
        m_parameters = 0;
    }

    // Created lazily.
    m_signature = 0;
    m_methodID = 0;

    jclass modifierClass = env->FindClass("java/lang/reflect/Modifier");
    int modifiers = callJNIMethod<jint>(aMethod, "getModifiers", "()I");
    m_isStatic = static_cast<bool>(callJNIStaticMethod<jboolean>(modifierClass, "isStatic", "(I)Z", modifiers));
    env->DeleteLocalRef(modifierClass);
}

JavaMethod::~JavaMethod()
{
    if (m_signature)
        fastFree(m_signature);
    delete[] m_parameters;
};

// JNI method signatures use '/' between components of a class name, but
// we get '.' between components from the reflection API.
static void appendClassName(StringBuilder& builder, const char* className)
{
#if USE(JSC)
    ASSERT(JSLock::lockCount() > 0);
#endif

    char* c = fastStrDup(className);

    char* result = c;
    while (*c) {
        if (*c == '.')
            *c = '/';
        c++;
    }

    builder.append(result);

    fastFree(result);
}

const char* JavaMethod::signature() const
{
    if (!m_signature) {
#if USE(JSC)
        JSLock lock(SilenceAssertionsOnly);
#endif

        StringBuilder signatureBuilder;
        signatureBuilder.append("(");
        for (int i = 0; i < m_numParameters; i++) {
            JavaParameter* aParameter = parameterAt(i);
            JNIType type = aParameter->getJNIType();
            if (type == array_type)
                appendClassName(signatureBuilder, aParameter->type());
            else {
                signatureBuilder.append(signatureFromPrimitiveType(type));
                if (type == object_type) {
                    appendClassName(signatureBuilder, aParameter->type());
                    signatureBuilder.append(";");
                }
            }
        }
        signatureBuilder.append(")");

        const char* returnType = m_returnType.UTF8String();
        if (m_JNIReturnType == array_type)
            appendClassName(signatureBuilder, returnType);
        else {
            signatureBuilder.append(signatureFromPrimitiveType(m_JNIReturnType));
            if (m_JNIReturnType == object_type) {
                appendClassName(signatureBuilder, returnType);
                signatureBuilder.append(";");
            }
        }

        String signatureString = signatureBuilder.toString();
        m_signature = fastStrDup(signatureString.utf8().data());
    }

    return m_signature;
}

JNIType JavaMethod::JNIReturnType() const
{
    return m_JNIReturnType;
}

jmethodID JavaMethod::methodID(jobject obj) const
{
    if (!m_methodID)
        m_methodID = getMethodID(obj, m_name.UTF8String(), signature());
    return m_methodID;
}

#endif // ENABLE(MAC_JAVA_BRIDGE)