/*
 * Copyright (c) 2010, 2013, 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
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 * questions.
 */

package jdk.nashorn.internal.objects;

import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
import static jdk.nashorn.internal.runtime.UnwarrantedOptimismException.isValid;

import jdk.dynalink.CallSiteDescriptor;
import jdk.dynalink.beans.StaticClass;
import jdk.dynalink.linker.GuardedInvocation;
import jdk.dynalink.linker.LinkRequest;
import jdk.nashorn.internal.objects.annotations.Attribute;
import jdk.nashorn.internal.objects.annotations.Constructor;
import jdk.nashorn.internal.objects.annotations.Function;
import jdk.nashorn.internal.objects.annotations.ScriptClass;
import jdk.nashorn.internal.runtime.Context;
import jdk.nashorn.internal.runtime.JSType;
import jdk.nashorn.internal.runtime.NativeJavaPackage;
import jdk.nashorn.internal.runtime.PropertyMap;
import jdk.nashorn.internal.runtime.ScriptObject;
import jdk.nashorn.internal.runtime.ScriptRuntime;
import jdk.nashorn.internal.runtime.UnwarrantedOptimismException;
import jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor;

This is "JavaImporter" constructor. This constructor allows you to use Java types omitting explicit package names. Objects of this constructor are used along with "with" statements and as such are not usable in ECMAScript strict mode. Example: 
    var imports = new JavaImporter(java.util, java.io);
    with (imports) {
        var m = new HashMap(); // java.util.HashMap
        var f = new File("."); // java.io.File
        ...
    }
 Note however that the preferred way for accessing Java types in Nashorn is through the use of Java.type() method. /**
 * This is "JavaImporter" constructor. This constructor allows you to use Java types omitting explicit package names.
 * Objects of this constructor are used along with {@code "with"} statements and as such are not usable in ECMAScript
 * strict mode. Example:
 * <pre>
 *     var imports = new JavaImporter(java.util, java.io);
 *     with (imports) {
 *         var m = new HashMap(); // java.util.HashMap
 *         var f = new File("."); // java.io.File
 *         ...
 *     }
 * </pre>
 * Note however that the preferred way for accessing Java types in Nashorn is through the use of
 * {@link NativeJava#type(Object, Object) Java.type()} method.
 */
@ScriptClass("JavaImporter")
public final class NativeJavaImporter extends ScriptObject {
    private final Object[] args;

    // initialized by nasgen
    private static PropertyMap $nasgenmap$;

    private NativeJavaImporter(final Object[] args, final ScriptObject proto, final PropertyMap map) {
        super(proto, map);
        this.args = args;
    }

    private NativeJavaImporter(final Object[] args, final Global global) {
        this(args, global.getJavaImporterPrototype(), $nasgenmap$);
    }

    private NativeJavaImporter(final Object[] args) {
        this(args, Global.instance());
    }

    @Override
    public String getClassName() {
        return "JavaImporter";
    }

    
Constructor
Params:
isNew – is the new operator used for instantiating this NativeJavaImporter
self – self reference
args – arguments
Returns:
NativeJavaImporter instance/**
     * Constructor
     * @param isNew is the new operator used for instantiating this NativeJavaImporter
     * @param self self reference
     * @param args arguments
     * @return NativeJavaImporter instance
     */
    @Constructor(arity = 1)
    public static NativeJavaImporter constructor(final boolean isNew, final Object self, final Object... args) {
        return new NativeJavaImporter(args);
    }

    
"No such property" handler.
Params:
self – self reference
name – property name
Returns:
value of the missing property/**
     * "No such property" handler.
     *
     * @param self self reference
     * @param name property name
     * @return value of the missing property
     */
    @Function(attributes = Attribute.NOT_ENUMERABLE)
    public static Object __noSuchProperty__(final Object self, final Object name) {
        if (! (self instanceof NativeJavaImporter)) {
            throw typeError("not.a.java.importer", ScriptRuntime.safeToString(self));
        }
        return ((NativeJavaImporter)self).createProperty(JSType.toString(name));
    }

    
"No such method call" handler
Params:
self – self reference
args – arguments to method
Returns:
never returns always throw TypeError/**
     * "No such method call" handler
     *
     * @param self self reference
     * @param args arguments to method
     * @return never returns always throw TypeError
     */
    @Function(attributes = Attribute.NOT_ENUMERABLE)
    public static Object __noSuchMethod__(final Object self, final Object... args) {
       throw typeError("not.a.function", ScriptRuntime.safeToString(args[0]));
    }

    @Override
    public GuardedInvocation noSuchProperty(final CallSiteDescriptor desc, final LinkRequest request) {
        return createAndSetProperty(desc) ? super.lookup(desc, request) : super.noSuchProperty(desc, request);
    }

    @Override
    public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) {
        return createAndSetProperty(desc) ? super.lookup(desc, request) : super.noSuchMethod(desc, request);
    }

    @Override
    protected Object invokeNoSuchProperty(final Object key, final boolean isScope, final int programPoint) {
        if (!(key instanceof String)) {
            return super.invokeNoSuchProperty(key, isScope, programPoint);
        }
        final Object retval = createProperty((String) key);
        if (isValid(programPoint)) {
            throw new UnwarrantedOptimismException(retval, programPoint);
        }
        return retval;
    }

    private boolean createAndSetProperty(final CallSiteDescriptor desc) {
        final String name = NashornCallSiteDescriptor.getOperand(desc);
        final Object value = createProperty(name);
        if(value != null) {
            set(name, value, 0);
            return true;
        }
        return false;
    }

    private Object createProperty(final String name) {
        final int len = args.length;

        for (int i = len - 1; i > -1; i--) {
            final Object obj = args[i];

            if (obj instanceof StaticClass) {
                if (((StaticClass)obj).getRepresentedClass().getSimpleName().equals(name)) {
                    return obj;
                }
            } else if (obj instanceof NativeJavaPackage) {
                final String pkgName  = ((NativeJavaPackage)obj).getName();
                final String fullName = pkgName.isEmpty() ? name : (pkgName + "." + name);
                final Context context = Global.instance().getContext();
                try {
                    return StaticClass.forClass(context.findClass(fullName));
                } catch (final ClassNotFoundException e) {
                    // IGNORE
                }
            }
        }
        return null;
    }
}