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package jdk.nashorn.api.scripting;

import jdk.nashorn.internal.runtime.JSType;

Default implementation of 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 JSObject interface.
/** * 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"); } }