| /* |
| * Copyright (c) 2015, 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 jdk.nashorn.api.scripting; |
| |
| import jdk.nashorn.internal.runtime.JSType; |
| |
| /** |
| * Default implementation of {@link JSObject#getDefaultValue(Class)}. Isolated into a separate class mostly so |
| * that we can have private static instances of function name arrays, something we couldn't declare without it |
| * being visible in {@link JSObject} interface. |
| */ |
| class DefaultValueImpl { |
| private static final String[] DEFAULT_VALUE_FNS_NUMBER = new String[] { "valueOf", "toString" }; |
| private static final String[] DEFAULT_VALUE_FNS_STRING = new String[] { "toString", "valueOf" }; |
| |
| static Object getDefaultValue(final JSObject jsobj, final Class<?> hint) throws UnsupportedOperationException { |
| final boolean isNumber = hint == null || hint == Number.class; |
| for(final String methodName: isNumber ? DEFAULT_VALUE_FNS_NUMBER : DEFAULT_VALUE_FNS_STRING) { |
| final Object objMember = jsobj.getMember(methodName); |
| if (objMember instanceof JSObject) { |
| final JSObject member = (JSObject)objMember; |
| if (member.isFunction()) { |
| final Object value = member.call(jsobj); |
| if (JSType.isPrimitive(value)) { |
| return value; |
| } |
| } |
| } |
| } |
| throw new UnsupportedOperationException(isNumber ? "cannot.get.default.number" : "cannot.get.default.string"); |
| } |
| } |