Java Javascript Mozilla Library functionArg(Object[] args, int pos, boolean required)

Description

Return the argument at "pos" as a Function, and throw an exception if "required" and the list is too short.

License

Open Source License

Declaration

public static Function functionArg(Object[] args, int pos, boolean required) 

Method Source Code

//package com.java2s;
/**//from   w w  w. j  a v a 2s.c om
 * Copyright 2013 Apigee Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

import org.mozilla.javascript.EvaluatorException;
import org.mozilla.javascript.Function;

public class Main {
    /**
     * Return the argument at "pos" as a Function, and throw an exception if "required" and the list is too short.
     */
    public static Function functionArg(Object[] args, int pos, boolean required) {
        if (required) {
            ensureArg(args, pos);
        }
        if (pos < args.length) {
            if (args[pos] instanceof Function) {
                return (Function) args[pos];
            } else {
                if (required) {
                    throw new EvaluatorException("Function expected");
                } else {
                    return null;
                }
            }
        } else {
            return null;
        }
    }

    /**
     * Throw an execption if the argument list isn't long enough for argument "pos".
     */
    public static void ensureArg(Object[] args, int pos) {
        if (pos >= args.length) {
            throw new EvaluatorException("Not enough arguments.");
        }
    }
}

Related

1. createSecurityController()
2. ensureValid(Object obj)
3. enterContext()
4. evaluateJSExpression(String expr, Context cx, Scriptable scope)
5. from(Scriptable scriptable)
6. getArray(Scriptable scope, NativeArray array)
7. getClassOrObjectProto(Scriptable scope, String className)
8. getDirectColRefExpr(Node refNode, boolean mode)
9. getFunctionArgsString(FunctionNode fn)