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PrimitiveWrapFactory.java

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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/. */

import org.mozilla.javascript.Context;

import org.mozilla.javascript.Scriptable;

import org.mozilla.javascript.WrapFactory;

/**

* An example WrapFactory that can be used to avoid wrapping of Java types that can be converted to

* ECMA primitive values. So java.lang.String is mapped to ECMA string, all java.lang.Numbers are

* mapped to ECMA numbers, and java.lang.Booleans are mapped to ECMA booleans instead of being

* wrapped as objects. Additionally java.lang.Character is converted to ECMA string with length 1.

* Other types have the default behavior.

*

* <p>Note that calling "new java.lang.String('foo')" in JavaScript with this wrap factory enabled

* will still produce a wrapped Java object since the WrapFactory.wrapNewObject method is not

* overridden.

*

* <p>The PrimitiveWrapFactory is enabled on a Context by calling setWrapFactory on that context.

*/

public class PrimitiveWrapFactory extends WrapFactory {

@Override

public Object wrap(Context cx, Scriptable scope, Object obj, Class<?> staticType) {

if (obj instanceof String || obj instanceof Number || obj instanceof Boolean) {

return obj;

} else if (obj instanceof Character) {

char[] a = {((Character) obj).charValue()};

return new String(a);

}

return super.wrap(cx, scope, obj, staticType);

}

}