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/*
 * Copyright (c) 2017, 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.svm.jni.access;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Function;

import org.graalvm.nativeimage.Platform.HOSTED_ONLY;
import org.graalvm.nativeimage.Platforms;

import jdk.vm.ci.meta.MetaUtil;

/**
 * Information on a class that can be looked up and accessed via JNI.
 */
public final class JNIAccessibleClass {
    private final Class classObject;
    private Map methods;
    private Map fields;

    JNIAccessibleClass(Class clazz) {
        this.classObject = clazz;
    }

    public Class getClassObject() {
        return classObject;
    }

    public Collection getFields() {
        return (fields != null) ? fields.values() : Collections.emptySet();
    }

    Map getFieldsByName() {
        return (fields != null) ? fields : Collections.emptyMap();
    }

    public JNIAccessibleField getField(String name) {
        return (fields != null) ? fields.get(name) : null;
    }

    @Platforms(HOSTED_ONLY.class)
    void addFieldIfAbsent(String name, Function mappingFunction) {
        if (fields == null) {
            fields = new HashMap<>();
        }
        fields.computeIfAbsent(name, mappingFunction);
    }

    @Platforms(HOSTED_ONLY.class)
    void addMethodIfAbsent(JNIAccessibleMethodDescriptor descriptor, Function mappingFunction) {
        if (methods == null) {
            methods = new HashMap<>();
        }
        methods.computeIfAbsent(descriptor, mappingFunction);
    }

    public Collection getMethods() {
        return (methods != null) ? methods.values() : Collections.emptySet();
    }

    public Map getMethodsByDescriptor() {
        return (methods != null) ? methods : Collections.emptyMap();
    }

    public JNIAccessibleMethod getMethod(JNIAccessibleMethodDescriptor descriptor) {
        return (methods != null) ? methods.get(descriptor) : null;
    }

    String getInternalName() {
        return MetaUtil.toInternalName(classObject.getName());
    }
}