xref: /openjdk10/nashorn/samples/javahelp.js

/*
 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
 *
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 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

// script helpers to print meta info on Java instances and classes

// print instance methods info on a Java object or static methods info of a Java class
function methods(jobj) {
    if (! Java.isJavaObject(jobj)) {
        throw new TypeError("not a Java object");
    }

    var isStatic = Java.isType(jobj);
    var obj = Object.bindProperties({}, jobj);
    for each (var i in obj) {
        if (Java.isJavaMethod(i)) {
            var str = String(i);
            var idx = str.indexOf(' ');
            var overloaded = str.substring(0, idx).endsWith("OverloadedDynamicMethod");
            var lastIdx = isStatic? str.lastIndexOf('] on') : str.lastIndexOf(']');
            print(str.substring(idx + 1, lastIdx) + (overloaded? "*" : ""))
        }
    }
}

// print instance field names of a Java object or static field names of a Java class
function fields(jobj) {
    if (! Java.isJavaObject(jobj)) {
        throw new TypeError("not a Java object");
    }

    var obj = Object.bindProperties({}, jobj);
    for (var i in obj) {
        if (! Java.isJavaMethod(obj[i])) {
            print(i);
        }
    }
}