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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.
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/* -*- 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.xmlimpl;

import org.mozilla.javascript.Context;
import org.mozilla.javascript.IdFunctionObject;
import org.mozilla.javascript.IdScriptableObject;
import org.mozilla.javascript.ScriptRuntime;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.Undefined;

/** Class Namespace */
class Namespace extends IdScriptableObject {
    static final long serialVersionUID = -5765755238131301744L;

    private static final Object NAMESPACE_TAG = "Namespace";

    private Namespace prototype;
    private XmlNode.Namespace ns;

    private Namespace() {}

    static Namespace create(Scriptable scope, Namespace prototype, XmlNode.Namespace namespace) {
        Namespace rv = new Namespace();
        rv.setParentScope(scope);
        rv.prototype = prototype;
        rv.setPrototype(prototype);
        rv.ns = namespace;
        return rv;
    }

    final XmlNode.Namespace getDelegate() {
        return ns;
    }

    public void exportAsJSClass(boolean sealed) {
        exportAsJSClass(MAX_PROTOTYPE_ID, this.getParentScope(), sealed);
    }

    public String uri() {
        return ns.getUri();
    }

    public String prefix() {
        return ns.getPrefix();
    }

    @Override
    public String toString() {
        return uri();
    }

    public String toLocaleString() {
        return toString();
    }

    private boolean equals(Namespace n) {
        return uri().equals(n.uri());
    }

    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof Namespace)) return false;
        return equals((Namespace) obj);
    }

    @Override
    public int hashCode() {
        return uri().hashCode();
    }

    @Override
    protected Object equivalentValues(Object value) {
        if (!(value instanceof Namespace)) return Scriptable.NOT_FOUND;
        boolean result = equals((Namespace) value);
        return result ? Boolean.TRUE : Boolean.FALSE;
    }

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

    @Override
    public Object getDefaultValue(Class hint) {
        return uri();
    }

    // #string_id_map#
    private static final int Id_prefix = 1, Id_uri = 2, MAX_INSTANCE_ID = 2;

    @Override
    protected int getMaxInstanceId() {
        return super.getMaxInstanceId() + MAX_INSTANCE_ID;
    }

    @Override
    protected int findInstanceIdInfo(String s) {
        int id;
        // #generated# Last update: 2007-08-20 08:23:22 EDT
        L0:
        {
            id = 0;
            String X = null;
            int s_length = s.length();
            if (s_length == 3) {
                X = "uri";
                id = Id_uri;
            } else if (s_length == 6) {
                X = "prefix";
                id = Id_prefix;
            }
            if (X != null && X != s && !X.equals(s)) id = 0;
            break L0;
        }
        // #/generated#

        if (id == 0) return super.findInstanceIdInfo(s);

        int attr;
        switch (id) {
            case Id_prefix:
            case Id_uri:
                attr = PERMANENT | READONLY;
                break;
            default:
                throw new IllegalStateException();
        }
        return instanceIdInfo(attr, super.getMaxInstanceId() + id);
    }
    // #/string_id_map#

    @Override
    protected String getInstanceIdName(int id) {
        switch (id - super.getMaxInstanceId()) {
            case Id_prefix:
                return "prefix";
            case Id_uri:
                return "uri";
        }
        return super.getInstanceIdName(id);
    }

    @Override
    protected Object getInstanceIdValue(int id) {
        switch (id - super.getMaxInstanceId()) {
            case Id_prefix:
                if (ns.getPrefix() == null) return Undefined.instance;
                return ns.getPrefix();
            case Id_uri:
                return ns.getUri();
        }
        return super.getInstanceIdValue(id);
    }

    // #string_id_map#
    private static final int Id_constructor = 1,
            Id_toString = 2,
            Id_toSource = 3,
            MAX_PROTOTYPE_ID = 3;

    @Override
    protected int findPrototypeId(String s) {
        int id;
        // #generated# Last update: 2007-08-20 08:23:22 EDT
        L0:
        {
            id = 0;
            String X = null;
            int c;
            int s_length = s.length();
            if (s_length == 8) {
                c = s.charAt(3);
                if (c == 'o') {
                    X = "toSource";
                    id = Id_toSource;
                } else if (c == 't') {
                    X = "toString";
                    id = Id_toString;
                }
            } else if (s_length == 11) {
                X = "constructor";
                id = Id_constructor;
            }
            if (X != null && X != s && !X.equals(s)) id = 0;
            break L0;
        }
        // #/generated#
        return id;
    }
    // #/string_id_map#

    @Override
    protected void initPrototypeId(int id) {
        String s;
        int arity;
        switch (id) {
            case Id_constructor:
                arity = 2;
                s = "constructor";
                break;
            case Id_toString:
                arity = 0;
                s = "toString";
                break;
            case Id_toSource:
                arity = 0;
                s = "toSource";
                break;
            default:
                throw new IllegalArgumentException(String.valueOf(id));
        }
        initPrototypeMethod(NAMESPACE_TAG, id, s, arity);
    }

    @Override
    public Object execIdCall(
            IdFunctionObject f, Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
        if (!f.hasTag(NAMESPACE_TAG)) {
            return super.execIdCall(f, cx, scope, thisObj, args);
        }
        int id = f.methodId();
        switch (id) {
            case Id_constructor:
                return jsConstructor(cx, (thisObj == null), args);
            case Id_toString:
                return realThis(thisObj, f).toString();
            case Id_toSource:
                return realThis(thisObj, f).js_toSource();
        }
        throw new IllegalArgumentException(String.valueOf(id));
    }

    private Namespace realThis(Scriptable thisObj, IdFunctionObject f) {
        return ensureType(thisObj, Namespace.class, f);
    }

    Namespace newNamespace(String uri) {
        Namespace prototype = (this.prototype == null) ? this : this.prototype;
        return create(this.getParentScope(), prototype, XmlNode.Namespace.create(uri));
    }

    Namespace newNamespace(String prefix, String uri) {
        if (prefix == null) return newNamespace(uri);
        Namespace prototype = (this.prototype == null) ? this : this.prototype;
        return create(this.getParentScope(), prototype, XmlNode.Namespace.create(prefix, uri));
    }

    Namespace constructNamespace(Object uriValue) {
        String prefix;
        String uri;

        if (uriValue instanceof Namespace) {
            Namespace ns = (Namespace) uriValue;
            prefix = ns.prefix();
            uri = ns.uri();
        } else if (uriValue instanceof QName) {
            QName qname = (QName) uriValue;
            uri = qname.uri();
            if (uri != null) {
                //    TODO    Is there a way to push this back into QName so that we can make
                // prefix() private?
                prefix = qname.prefix();
            } else {
                uri = qname.toString();
                prefix = null;
            }
        } else {
            uri = ScriptRuntime.toString(uriValue);
            prefix = (uri.length() == 0) ? "" : null;
        }

        return newNamespace(prefix, uri);
    }

    Namespace castToNamespace(Object namespaceObj) {
        if (namespaceObj instanceof Namespace) {
            return (Namespace) namespaceObj;
        }
        return constructNamespace(namespaceObj);
    }

    private Namespace constructNamespace(Object prefixValue, Object uriValue) {
        String prefix;
        String uri;

        if (uriValue instanceof QName) {
            QName qname = (QName) uriValue;
            uri = qname.uri();
            if (uri == null) {
                uri = qname.toString();
            }
        } else {
            uri = ScriptRuntime.toString(uriValue);
        }

        if (uri.length() == 0) {
            if (prefixValue == Undefined.instance) {
                prefix = "";
            } else {
                prefix = ScriptRuntime.toString(prefixValue);
                if (prefix.length() != 0) {
                    throw ScriptRuntime.typeError(
                            "Illegal prefix '" + prefix + "' for 'no namespace'.");
                }
            }
        } else if (prefixValue == Undefined.instance) {
            prefix = "";
        } else if (!XMLName.accept(prefixValue)) {
            prefix = "";
        } else {
            prefix = ScriptRuntime.toString(prefixValue);
        }

        return newNamespace(prefix, uri);
    }

    private Namespace constructNamespace() {
        return newNamespace("", "");
    }

    private Object jsConstructor(Context cx, boolean inNewExpr, Object[] args) {
        if (!inNewExpr && args.length == 1) {
            return castToNamespace(args[0]);
        }

        if (args.length == 0) {
            return constructNamespace();
        } else if (args.length == 1) {
            return constructNamespace(args[0]);
        } else {
            return constructNamespace(args[0], args[1]);
        }
    }

    private String js_toSource() {
        StringBuilder sb = new StringBuilder();
        sb.append('(');
        toSourceImpl(ns.getPrefix(), ns.getUri(), sb);
        sb.append(')');
        return sb.toString();
    }

    static void toSourceImpl(String prefix, String uri, StringBuilder sb) {
        sb.append("new Namespace(");
        if (uri.length() == 0) {
            if (!"".equals(prefix)) throw new IllegalArgumentException(prefix);
        } else {
            sb.append('\'');
            if (prefix != null) {
                sb.append(ScriptRuntime.escapeString(prefix, '\''));
                sb.append("', '");
            }
            sb.append(ScriptRuntime.escapeString(uri, '\''));
            sb.append('\'');
        }
        sb.append(')');
    }
}