/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.javascript;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.math.BigInteger;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;

/**
 * This class reflects non-Array Java objects into the JavaScript environment. It reflect fields
 * directly, and uses NativeJavaMethod objects to reflect (possibly overloaded) methods. It also
 * provides iterator support for all iterable objects.
 *
 * <p>
 *
 * @author Mike Shaver
 * @see NativeJavaArray
 * @see NativeJavaPackage
 * @see NativeJavaClass
 */
public class NativeJavaObject implements Scriptable, SymbolScriptable, Wrapper, Serializable {

    private static final long serialVersionUID = -6948590651130498591L;

    static void init(ScriptableObject scope, boolean sealed) {
        JavaIterableIterator.init(scope, sealed);
    }

    public NativeJavaObject() {}

    public NativeJavaObject(Scriptable scope, Object javaObject, Class<?> staticType) {
        this(scope, javaObject, staticType, false);
    }

    public NativeJavaObject(
            Scriptable scope, Object javaObject, Class<?> staticType, boolean isAdapter) {
        this.parent = scope;
        this.javaObject = javaObject;
        this.staticType = staticType;
        this.isAdapter = isAdapter;
        initMembers();
    }

    protected void initMembers() {
        Class<?> dynamicType;
        if (javaObject != null) {
            dynamicType = javaObject.getClass();
        } else {
            dynamicType = staticType;
        }
        members = JavaMembers.lookupClass(parent, dynamicType, staticType, isAdapter);
        fieldAndMethods = members.getFieldAndMethodsObjects(this, javaObject, false);
    }

    @Override
    public boolean has(String name, Scriptable start) {
        return members.has(name, false);
    }

    @Override
    public boolean has(int index, Scriptable start) {
        return false;
    }

    @Override
    public boolean has(Symbol key, Scriptable start) {
        if (SymbolKey.ITERATOR.equals(key) && javaObject instanceof Iterable) {
            return true;
        }
        return false;
    }

    @Override
    public Object get(String name, Scriptable start) {
        if (fieldAndMethods != null) {
            Object result = fieldAndMethods.get(name);
            if (result != null) {
                return result;
            }
        }
        // TODO: passing 'this' as the scope is bogus since it has
        //  no parent scope
        return members.get(this, name, javaObject, false);
    }

    @Override
    public Object get(Symbol key, Scriptable start) {
        if (SymbolKey.ITERATOR.equals(key) && javaObject instanceof Iterable) {
            return symbol_iterator;
        }
        // Native Java objects have no Symbol members
        return Scriptable.NOT_FOUND;
    }

    @Override
    public Object get(int index, Scriptable start) {
        throw members.reportMemberNotFound(Integer.toString(index));
    }

    @Override
    public void put(String name, Scriptable start, Object value) {
        // We could be asked to modify the value of a property in the
        // prototype. Since we can't add a property to a Java object,
        // we modify it in the prototype rather than copy it down.
        if (prototype == null || members.has(name, false))
            members.put(this, name, javaObject, value, false);
        else prototype.put(name, prototype, value);
    }

    @Override
    public void put(Symbol symbol, Scriptable start, Object value) {
        // We could be asked to modify the value of a property in the
        // prototype. Since we can't add a property to a Java object,
        // we modify it in the prototype rather than copy it down.
        String name = symbol.toString();
        if (prototype == null || members.has(name, false)) {
            members.put(this, name, javaObject, value, false);
        } else if (prototype instanceof SymbolScriptable) {
            ((SymbolScriptable) prototype).put(symbol, prototype, value);
        }
    }

    @Override
    public void put(int index, Scriptable start, Object value) {
        throw members.reportMemberNotFound(Integer.toString(index));
    }

    @Override
    public boolean hasInstance(Scriptable value) {
        // This is an instance of a Java class, so always return false
        return false;
    }

    @Override
    public void delete(String name) {}

    @Override
    public void delete(Symbol key) {}

    @Override
    public void delete(int index) {}

    @Override
    public Scriptable getPrototype() {
        if (prototype == null && javaObject instanceof String) {
            return TopLevel.getBuiltinPrototype(
                    ScriptableObject.getTopLevelScope(parent), TopLevel.Builtins.String);
        }
        return prototype;
    }

    /** Sets the prototype of the object. */
    @Override
    public void setPrototype(Scriptable m) {
        prototype = m;
    }

    /** Returns the parent (enclosing) scope of the object. */
    @Override
    public Scriptable getParentScope() {
        return parent;
    }

    /** Sets the parent (enclosing) scope of the object. */
    @Override
    public void setParentScope(Scriptable m) {
        parent = m;
    }

    @Override
    public Object[] getIds() {
        return members.getIds(false);
    }

    /**
     * @deprecated Use {@link Context#getWrapFactory()} together with calling {@link
     *     WrapFactory#wrap(Context, Scriptable, Object, Class)}
     */
    @Deprecated
    public static Object wrap(Scriptable scope, Object obj, Class<?> staticType) {

        Context cx = Context.getContext();
        return cx.getWrapFactory().wrap(cx, scope, obj, staticType);
    }

    @Override
    public Object unwrap() {
        return javaObject;
    }

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

    @Override
    public Object getDefaultValue(Class<?> hint) {
        Object value;
        if (hint == null) {
            if (javaObject instanceof Boolean) {
                hint = ScriptRuntime.BooleanClass;
            }
            if (javaObject instanceof Number) {
                hint = ScriptRuntime.NumberClass;
            }
        }
        if (hint == null || hint == ScriptRuntime.StringClass) {
            value = javaObject.toString();
        } else {
            String converterName;
            if (hint == ScriptRuntime.BooleanClass) {
                converterName = "booleanValue";
            } else if (hint == ScriptRuntime.NumberClass) {
                converterName = "doubleValue";
            } else {
                throw Context.reportRuntimeErrorById("msg.default.value");
            }
            Object converterObject = get(converterName, this);
            if (converterObject instanceof Function) {
                Function f = (Function) converterObject;
                value =
                        f.call(
                                Context.getContext(),
                                f.getParentScope(),
                                this,
                                ScriptRuntime.emptyArgs);
            } else {
                if (hint == ScriptRuntime.NumberClass && javaObject instanceof Boolean) {
                    boolean b = ((Boolean) javaObject).booleanValue();
                    value = b ? ScriptRuntime.wrapNumber(1.0) : ScriptRuntime.zeroObj;
                } else {
                    value = javaObject.toString();
                }
            }
        }
        return value;
    }

    /**
     * Determine whether we can/should convert between the given type and the desired one. This
     * should be superceded by a conversion-cost calculation function, but for now I'll hide behind
     * precedent.
     */
    public static boolean canConvert(Object fromObj, Class<?> to) {
        int weight = getConversionWeight(fromObj, to);

        return (weight < CONVERSION_NONE);
    }

    private static final int JSTYPE_UNDEFINED = 0; // undefined type
    private static final int JSTYPE_NULL = 1; // null
    private static final int JSTYPE_BOOLEAN = 2; // boolean
    private static final int JSTYPE_NUMBER = 3; // number
    private static final int JSTYPE_STRING = 4; // string
    private static final int JSTYPE_JAVA_CLASS = 5; // JavaClass
    private static final int JSTYPE_JAVA_OBJECT = 6; // JavaObject
    private static final int JSTYPE_JAVA_ARRAY = 7; // JavaArray
    private static final int JSTYPE_OBJECT = 8; // Scriptable
    private static final int JSTYPE_BIGINT = 9; // BigInt

    static final byte CONVERSION_TRIVIAL = 1;
    static final byte CONVERSION_NONTRIVIAL = 0;
    static final byte CONVERSION_NONE = 99;

    /**
     * Derive a ranking based on how "natural" the conversion is. The special value CONVERSION_NONE
     * means no conversion is possible, and CONVERSION_NONTRIVIAL signals that more type conformance
     * testing is required. Based on <a
     * href="http://www.mozilla.org/js/liveconnect/lc3_method_overloading.html">"preferred method
     * conversions" from Live Connect 3</a>
     */
    static int getConversionWeight(Object fromObj, Class<?> to) {
        int fromCode = getJSTypeCode(fromObj);

        switch (fromCode) {
            case JSTYPE_UNDEFINED:
                if (to == ScriptRuntime.StringClass || to == ScriptRuntime.ObjectClass) {
                    return 1;
                }
                break;

            case JSTYPE_NULL:
                if (!to.isPrimitive()) {
                    return 1;
                }
                break;

            case JSTYPE_BOOLEAN:
                // "boolean" is #1
                if (to == Boolean.TYPE) {
                    return 1;
                } else if (to == ScriptRuntime.BooleanClass) {
                    return 2;
                } else if (to == ScriptRuntime.ObjectClass) {
                    return 3;
                } else if (to == ScriptRuntime.StringClass) {
                    return 4;
                }
                break;

            case JSTYPE_NUMBER:
            case JSTYPE_BIGINT:
                if (to.isPrimitive()) {
                    if (to == Double.TYPE) {
                        return 1;
                    } else if (to != Boolean.TYPE) {
                        return 1 + getSizeRank(to);
                    }
                } else {
                    if (to == ScriptRuntime.StringClass) {
                        // native numbers are #1-8
                        return 9;
                    } else if (to == ScriptRuntime.BigIntegerClass) {
                        return 10;
                    } else if (to == ScriptRuntime.ObjectClass) {
                        return 11;
                    } else if (ScriptRuntime.NumberClass.isAssignableFrom(to)) {
                        // "double" is #1
                        return 2;
                    }
                }
                break;

            case JSTYPE_STRING:
                if (to == ScriptRuntime.StringClass) {
                    return 1;
                } else if (to.isInstance(fromObj)) {
                    return 2;
                } else if (to.isPrimitive()) {
                    if (to == Character.TYPE) {
                        return 3;
                    } else if (to != Boolean.TYPE) {
                        return 4;
                    }
                }
                break;

            case JSTYPE_JAVA_CLASS:
                if (to == ScriptRuntime.ClassClass) {
                    return 1;
                } else if (to == ScriptRuntime.ObjectClass) {
                    return 3;
                } else if (to == ScriptRuntime.StringClass) {
                    return 4;
                }
                break;

            case JSTYPE_JAVA_OBJECT:
            case JSTYPE_JAVA_ARRAY:
                Object javaObj = fromObj;
                if (javaObj instanceof Wrapper) {
                    javaObj = ((Wrapper) javaObj).unwrap();
                }
                if (to.isInstance(javaObj)) {
                    return CONVERSION_NONTRIVIAL;
                }
                if (to == ScriptRuntime.StringClass) {
                    return 2;
                } else if (to.isPrimitive() && to != Boolean.TYPE) {
                    return (fromCode == JSTYPE_JAVA_ARRAY) ? CONVERSION_NONE : 2 + getSizeRank(to);
                }
                break;

            case JSTYPE_OBJECT:
                // Other objects takes #1-#3 spots
                if (to != ScriptRuntime.ObjectClass && to.isInstance(fromObj)) {
                    // No conversion required, but don't apply for java.lang.Object
                    return 1;
                }
                if (to.isArray()) {
                    if (fromObj instanceof NativeArray) {
                        // This is a native array conversion to a java array
                        // Array conversions are all equal, and preferable to object
                        // and string conversion, per LC3.
                        return 2;
                    }
                } else if (to == ScriptRuntime.ObjectClass) {
                    return 3;
                } else if (to == ScriptRuntime.StringClass) {
                    return 4;
                } else if (to == ScriptRuntime.DateClass) {
                    if (fromObj instanceof NativeDate) {
                        // This is a native date to java date conversion
                        return 1;
                    }
                } else if (to.isInterface()) {

                    if (fromObj instanceof NativeFunction) {
                        // See comments in createInterfaceAdapter
                        return 1;
                    }
                    if (fromObj instanceof NativeObject) {
                        return 2;
                    }
                    return 12;
                } else if (to.isPrimitive() && to != Boolean.TYPE) {
                    return 4 + getSizeRank(to);
                }
                break;
        }

        return CONVERSION_NONE;
    }

    static int getSizeRank(Class<?> aType) {
        if (aType == Double.TYPE) {
            return 1;
        } else if (aType == Float.TYPE) {
            return 2;
        } else if (aType == Long.TYPE) {
            return 3;
        } else if (aType == Integer.TYPE) {
            return 4;
        } else if (aType == Short.TYPE) {
            return 5;
        } else if (aType == Character.TYPE) {
            return 6;
        } else if (aType == Byte.TYPE) {
            return 7;
        } else if (aType == Boolean.TYPE) {
            return CONVERSION_NONE;
        } else {
            return 8;
        }
    }

    private static int getJSTypeCode(Object value) {
        if (value == null) {
            return JSTYPE_NULL;
        } else if (value == Undefined.instance) {
            return JSTYPE_UNDEFINED;
        } else if (value instanceof CharSequence) {
            return JSTYPE_STRING;
        } else if (value instanceof BigInteger) {
            return JSTYPE_BIGINT;
        } else if (value instanceof Number) {
            return JSTYPE_NUMBER;
        } else if (value instanceof Boolean) {
            return JSTYPE_BOOLEAN;
        } else if (value instanceof Scriptable) {
            if (value instanceof NativeJavaClass) {
                return JSTYPE_JAVA_CLASS;
            } else if (value instanceof NativeJavaArray) {
                return JSTYPE_JAVA_ARRAY;
            } else if (value instanceof Wrapper) {
                return JSTYPE_JAVA_OBJECT;
            } else {
                return JSTYPE_OBJECT;
            }
        } else if (value instanceof Class) {
            return JSTYPE_JAVA_CLASS;
        } else {
            Class<?> valueClass = value.getClass();
            if (valueClass.isArray()) {
                return JSTYPE_JAVA_ARRAY;
            }
            return JSTYPE_JAVA_OBJECT;
        }
    }

    /**
     * Not intended for public use. Callers should use the public API Context.toType.
     *
     * @deprecated as of 1.5 Release 4
     * @see org.mozilla.javascript.Context#jsToJava(Object, Class)
     */
    @Deprecated
    public static Object coerceType(Class<?> type, Object value) {
        return coerceTypeImpl(type, value);
    }

    /** Type-munging for field setting and method invocation. Conforms to LC3 specification */
    static Object coerceTypeImpl(Class<?> type, Object value) {
        if (value != null && value.getClass() == type) {
            return value;
        }

        int jsTypeCode = getJSTypeCode(value);
        switch (jsTypeCode) {
            case JSTYPE_NULL:
                // raise error if type.isPrimitive()
                if (type.isPrimitive()) {
                    reportConversionError(value, type);
                }
                return null;

            case JSTYPE_UNDEFINED:
                if (type == ScriptRuntime.StringClass || type == ScriptRuntime.ObjectClass) {
                    return "undefined";
                }
                reportConversionError("undefined", type);
                break;

            case JSTYPE_BOOLEAN:
                // Under LC3, only JS Booleans can be coerced into a Boolean value
                if (type == Boolean.TYPE
                        || type == ScriptRuntime.BooleanClass
                        || type == ScriptRuntime.ObjectClass) {
                    return value;
                } else if (type == ScriptRuntime.StringClass) {
                    return value.toString();
                } else {
                    reportConversionError(value, type);
                }
                break;

            case JSTYPE_NUMBER:
            case JSTYPE_BIGINT:
                if (type == ScriptRuntime.StringClass) {
                    return ScriptRuntime.toString(value);
                } else if (type == ScriptRuntime.ObjectClass) {
                    Context context = Context.getCurrentContext();
                    if ((context != null)
                            && context.hasFeature(Context.FEATURE_INTEGER_WITHOUT_DECIMAL_PLACE)) {
                        // to process numbers like 2.0 as 2 without decimal place
                        long roundedValue = Math.round(toDouble(value));
                        if (roundedValue == toDouble(value)) {
                            return coerceToNumber(Long.TYPE, value);
                        }
                    }
                    return coerceToNumber(
                            jsTypeCode == JSTYPE_BIGINT ? BigInteger.class : Double.TYPE, value);
                } else if ((type.isPrimitive() && type != Boolean.TYPE)
                        || ScriptRuntime.NumberClass.isAssignableFrom(type)) {
                    return coerceToNumber(type, value);
                } else {
                    reportConversionError(value, type);
                }
                break;

            case JSTYPE_STRING:
                if (type == ScriptRuntime.StringClass || type.isInstance(value)) {
                    return value.toString();
                } else if (type == Character.TYPE || type == ScriptRuntime.CharacterClass) {
                    // Special case for converting a single char string to a
                    // character
                    // Placed here because it applies *only* to JS strings,
                    // not other JS objects converted to strings
                    if (((CharSequence) value).length() == 1) {
                        return Character.valueOf(((CharSequence) value).charAt(0));
                    }
                    return coerceToNumber(type, value);
                } else if ((type.isPrimitive() && type != Boolean.TYPE)
                        || ScriptRuntime.NumberClass.isAssignableFrom(type)) {
                    return coerceToNumber(type, value);
                } else {
                    reportConversionError(value, type);
                }
                break;

            case JSTYPE_JAVA_CLASS:
                if (value instanceof Wrapper) {
                    value = ((Wrapper) value).unwrap();
                }

                if (type == ScriptRuntime.ClassClass || type == ScriptRuntime.ObjectClass) {
                    return value;
                } else if (type == ScriptRuntime.StringClass) {
                    return value.toString();
                } else {
                    reportConversionError(value, type);
                }
                break;

            case JSTYPE_JAVA_OBJECT:
            case JSTYPE_JAVA_ARRAY:
                if (value instanceof Wrapper) {
                    value = ((Wrapper) value).unwrap();
                }
                if (type.isPrimitive()) {
                    if (type == Boolean.TYPE) {
                        reportConversionError(value, type);
                    }
                    return coerceToNumber(type, value);
                }
                if (type == ScriptRuntime.StringClass) {
                    return value.toString();
                }
                if (type.isInstance(value)) {
                    return value;
                }
                reportConversionError(value, type);
                break;

            case JSTYPE_OBJECT:
                if (type == ScriptRuntime.StringClass) {
                    return ScriptRuntime.toString(value);
                } else if (type.isPrimitive()) {
                    if (type == Boolean.TYPE) {
                        reportConversionError(value, type);
                    }
                    return coerceToNumber(type, value);
                } else if (type.isInstance(value)) {
                    return value;
                } else if (type == ScriptRuntime.DateClass && value instanceof NativeDate) {
                    double time = ((NativeDate) value).getJSTimeValue();
                    // XXX: This will replace NaN by 0
                    return new Date((long) time);
                } else if (type.isArray() && value instanceof NativeArray) {
                    // Make a new java array, and coerce the JS array components
                    // to the target (component) type.
                    NativeArray array = (NativeArray) value;
                    long length = array.getLength();
                    Class<?> arrayType = type.getComponentType();
                    Object Result = Array.newInstance(arrayType, (int) length);
                    for (int i = 0; i < length; ++i) {
                        try {
                            Array.set(Result, i, coerceTypeImpl(arrayType, array.get(i, array)));
                        } catch (EvaluatorException ee) {
                            reportConversionError(value, type);
                        }
                    }

                    return Result;
                } else if (value instanceof Wrapper) {
                    value = ((Wrapper) value).unwrap();
                    if (type.isInstance(value)) return value;
                    reportConversionError(value, type);
                } else if (type.isInterface()
                        && (value instanceof NativeObject
                                || (value instanceof Callable
                                        && value instanceof ScriptableObject))) {
                    // Try to use function/object as implementation of Java interface.
                    return createInterfaceAdapter(type, (ScriptableObject) value);
                } else {
                    reportConversionError(value, type);
                }
                break;
        }

        return value;
    }

    protected static Object createInterfaceAdapter(Class<?> type, ScriptableObject so) {
        // XXX: Currently only instances of ScriptableObject are
        // supported since the resulting interface proxies should
        // be reused next time conversion is made and generic
        // Callable has no storage for it. Weak references can
        // address it but for now use this restriction.

        Object key = Kit.makeHashKeyFromPair(COERCED_INTERFACE_KEY, type);
        Object old = so.getAssociatedValue(key);
        if (old != null) {
            // Function was already wrapped
            return old;
        }
        Context cx = Context.getContext();
        Object glue = InterfaceAdapter.create(cx, type, so);
        // Store for later retrieval
        glue = so.associateValue(key, glue);
        return glue;
    }

    private static Object coerceToNumber(Class<?> type, Object value) {
        Class<?> valueClass = value.getClass();

        // Character
        if (type == Character.TYPE || type == ScriptRuntime.CharacterClass) {
            if (valueClass == ScriptRuntime.CharacterClass) {
                return value;
            }
            return Character.valueOf(
                    (char)
                            toInteger(
                                    value,
                                    ScriptRuntime.CharacterClass,
                                    Character.MIN_VALUE,
                                    Character.MAX_VALUE));
        }

        // Double, Float
        if (type == ScriptRuntime.ObjectClass
                || type == ScriptRuntime.DoubleClass
                || type == Double.TYPE) {
            if (valueClass == ScriptRuntime.DoubleClass) {
                return value;
            }
            return Double.valueOf(toDouble(value));
        }

        if (type == ScriptRuntime.BigIntegerClass) {
            if (valueClass == ScriptRuntime.BigIntegerClass) {
                return value;
            }
            return ScriptRuntime.toBigInt(value);
        }

        if (type == ScriptRuntime.FloatClass || type == Float.TYPE) {
            if (valueClass == ScriptRuntime.FloatClass) {
                return value;
            }
            double number = toDouble(value);
            if (Double.isInfinite(number) || Double.isNaN(number) || number == 0.0) {
                return Float.valueOf((float) number);
            }

            double absNumber = Math.abs(number);
            if (absNumber < Float.MIN_VALUE) {
                return Float.valueOf((number > 0.0) ? +0.0f : -0.0f);
            } else if (absNumber > Float.MAX_VALUE) {
                return Float.valueOf(
                        (number > 0.0) ? Float.POSITIVE_INFINITY : Float.NEGATIVE_INFINITY);
            } else {
                return Float.valueOf((float) number);
            }
        }

        // Integer, Long, Short, Byte
        if (type == ScriptRuntime.IntegerClass || type == Integer.TYPE) {
            if (valueClass == ScriptRuntime.IntegerClass) {
                return value;
            }
            return Integer.valueOf(
                    (int)
                            toInteger(
                                    value,
                                    ScriptRuntime.IntegerClass,
                                    Integer.MIN_VALUE,
                                    Integer.MAX_VALUE));
        }

        if (type == ScriptRuntime.LongClass || type == Long.TYPE) {
            if (valueClass == ScriptRuntime.LongClass) {
                return value;
            }
            /* Long values cannot be expressed exactly in doubles.
             * We thus use the largest and smallest double value that
             * has a value expressible as a long value. We build these
             * numerical values from their hexidecimal representations
             * to avoid any problems caused by attempting to parse a
             * decimal representation.
             */
            final double max = Double.longBitsToDouble(0x43dfffffffffffffL);
            final double min = Double.longBitsToDouble(0xc3e0000000000000L);
            return Long.valueOf(toInteger(value, ScriptRuntime.LongClass, min, max));
        }

        if (type == ScriptRuntime.ShortClass || type == Short.TYPE) {
            if (valueClass == ScriptRuntime.ShortClass) {
                return value;
            }
            return Short.valueOf(
                    (short)
                            toInteger(
                                    value,
                                    ScriptRuntime.ShortClass,
                                    Short.MIN_VALUE,
                                    Short.MAX_VALUE));
        }

        if (type == ScriptRuntime.ByteClass || type == Byte.TYPE) {
            if (valueClass == ScriptRuntime.ByteClass) {
                return value;
            }
            return Byte.valueOf(
                    (byte)
                            toInteger(
                                    value,
                                    ScriptRuntime.ByteClass,
                                    Byte.MIN_VALUE,
                                    Byte.MAX_VALUE));
        }

        return Double.valueOf(toDouble(value));
    }

    private static double toDouble(Object value) {
        if (value instanceof Number) {
            return ((Number) value).doubleValue();
        } else if (value instanceof String) {
            return ScriptRuntime.toNumber((String) value);
        } else if (value instanceof Scriptable) {
            if (value instanceof Wrapper) {
                // XXX: optimize tail-recursion?
                return toDouble(((Wrapper) value).unwrap());
            }
            return ScriptRuntime.toNumber(value);
        } else {
            Method meth;
            try {
                meth = value.getClass().getMethod("doubleValue", (Class[]) null);
            } catch (NoSuchMethodException e) {
                meth = null;
            } catch (SecurityException e) {
                meth = null;
            }
            if (meth != null) {
                try {
                    return ((Number) meth.invoke(value, (Object[]) null)).doubleValue();
                } catch (IllegalAccessException e) {
                    // XXX: ignore, or error message?
                    reportConversionError(value, Double.TYPE);
                } catch (InvocationTargetException e) {
                    // XXX: ignore, or error message?
                    reportConversionError(value, Double.TYPE);
                }
            }
            return ScriptRuntime.toNumber(value.toString());
        }
    }

    private static long toInteger(Object value, Class<?> type, double min, double max) {
        double d = toDouble(value);

        if (Double.isInfinite(d) || Double.isNaN(d)) {
            // Convert to string first, for more readable message
            reportConversionError(ScriptRuntime.toString(value), type);
        }

        if (d > 0.0) {
            d = Math.floor(d);
        } else {
            d = Math.ceil(d);
        }

        if (d < min || d > max) {
            // Convert to string first, for more readable message
            reportConversionError(ScriptRuntime.toString(value), type);
        }
        return (long) d;
    }

    static void reportConversionError(Object value, Class<?> type) {
        // It uses String.valueOf(value), not value.toString() since
        // value can be null, bug 282447.
        throw Context.reportRuntimeErrorById(
                "msg.conversion.not.allowed",
                String.valueOf(value),
                JavaMembers.javaSignature(type));
    }

    private void writeObject(ObjectOutputStream out) throws IOException {
        out.defaultWriteObject();

        out.writeBoolean(isAdapter);
        if (isAdapter) {
            if (adapter_writeAdapterObject == null) {
                throw new IOException();
            }
            Object[] args = {javaObject, out};
            try {
                adapter_writeAdapterObject.invoke(null, args);
            } catch (Exception ex) {
                throw new IOException();
            }
        } else {
            out.writeObject(javaObject);
        }

        if (staticType != null) {
            out.writeObject(staticType.getName());
        } else {
            out.writeObject(null);
        }
    }

    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
        in.defaultReadObject();

        isAdapter = in.readBoolean();
        if (isAdapter) {
            if (adapter_readAdapterObject == null) throw new ClassNotFoundException();
            Object[] args = {this, in};
            try {
                javaObject = adapter_readAdapterObject.invoke(null, args);
            } catch (Exception ex) {
                throw new IOException();
            }
        } else {
            javaObject = in.readObject();
        }

        String className = (String) in.readObject();
        if (className != null) {
            staticType = Class.forName(className);
        } else {
            staticType = null;
        }

        initMembers();
    }

    private static Callable symbol_iterator =
            (Context cx, Scriptable scope, Scriptable thisObj, Object[] args) -> {
                if (!(thisObj instanceof NativeJavaObject)) {
                    throw ScriptRuntime.typeErrorById("msg.incompat.call", SymbolKey.ITERATOR);
                }
                Object javaObject = ((NativeJavaObject) thisObj).javaObject;
                if (!(javaObject instanceof Iterable)) {
                    throw ScriptRuntime.typeErrorById("msg.incompat.call", SymbolKey.ITERATOR);
                }
                return new JavaIterableIterator(scope, (Iterable) javaObject);
            };

    private static final class JavaIterableIterator extends ES6Iterator {
        private static final long serialVersionUID = 1L;
        private static final String ITERATOR_TAG = "JavaIterableIterator";

        static void init(ScriptableObject scope, boolean sealed) {
            ES6Iterator.init(scope, sealed, new JavaIterableIterator(), ITERATOR_TAG);
        }

        /** Only for constructing the prototype object. */
        private JavaIterableIterator() {
            super();
        }

        JavaIterableIterator(Scriptable scope, Iterable iterable) {
            super(scope, ITERATOR_TAG);
            this.iterator = iterable.iterator();
        }

        @Override
        public String getClassName() {
            return "Java Iterable Iterator";
        }

        @Override
        protected boolean isDone(Context cx, Scriptable scope) {
            return !iterator.hasNext();
        }

        @Override
        protected Object nextValue(Context cx, Scriptable scope) {
            if (!iterator.hasNext()) {
                return Undefined.instance;
            }
            return iterator.next();
        }

        @Override
        protected String getTag() {
            return ITERATOR_TAG;
        }

        private Iterator iterator;
    }

    /** The prototype of this object. */
    protected Scriptable prototype;

    /** The parent scope of this object. */
    protected Scriptable parent;

    protected transient Object javaObject;

    protected transient Class<?> staticType;
    protected transient JavaMembers members;
    private transient Map<String, FieldAndMethods> fieldAndMethods;
    protected transient boolean isAdapter;

    private static final Object COERCED_INTERFACE_KEY = "Coerced Interface";
    private static Method adapter_writeAdapterObject;
    private static Method adapter_readAdapterObject;

    static {
        // Reflection in java is verbose
        Class<?>[] sig2 = new Class[2];
        Class<?> cl = Kit.classOrNull("org.mozilla.javascript.JavaAdapter");
        if (cl != null) {
            try {
                sig2[0] = ScriptRuntime.ObjectClass;
                sig2[1] = Kit.classOrNull("java.io.ObjectOutputStream");
                adapter_writeAdapterObject = cl.getMethod("writeAdapterObject", sig2);

                sig2[0] = ScriptRuntime.ScriptableClass;
                sig2[1] = Kit.classOrNull("java.io.ObjectInputStream");
                adapter_readAdapterObject = cl.getMethod("readAdapterObject", sig2);

            } catch (NoSuchMethodException e) {
                adapter_writeAdapterObject = null;
                adapter_readAdapterObject = null;
            }
        }
    }
}
