StackOverflow2013

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PO
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Id
16753965
data
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0
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1
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CreationDate
2013-05-25T21:15:35.253
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2013-05-25T22:00:08.053
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2013-05-25T22:00:08.053
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2333093
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2333093
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16751607
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2
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1
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text
Body
You could do it the following way, however you should carefully consider if you really want to use this approach as it is very slow and quite frankly, bad practice. I'll put it up anyway as to how you can do it: <pre><code>public final class Secured { private static final Set<Class<?>> allowedCallers = new HashSet<>(); static { allowedCallers.add(Allowed.class); } private static final class SecurityManagerExtension extends SecurityManager { private static final int OFFSET = 4; @Override protected Class<?>[] getClassContext() { return super.getClassContext(); } private Class<?> getCaller() { try { return getClassContext()[OFFSET]; } catch (ArrayIndexOutOfBoundsException e) { return null; } } } private Secured() { // protect against reflection attack Class<?> caller = new SecurityManagerExtension().getCaller(); if (!this.getClass().equals(caller)) { throw new IllegalStateException(); } System.out.println("Secured instance constructed!"); } public static Secured createInstance() { // this gets the class name of the calling class Class<?> caller = new SecurityManagerExtension().getCaller(); if (allowedCallers.contains(caller)) { System.out.println("Created instance by '" + caller + "'!"); return new Secured(); } else { System.out.println("No instance created because call was made by '" + caller + "'!"); return null; } } } </code></pre> Note the final keyword on the class to prevent subclassing. If you need to subclass the class yourself, move the final keyword to the factory method. Also note that this is not protected against serialization attacks.
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1. POAllowing object construction only from some packages
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1. USMarco
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1. USMarco
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1. POAllowing object construction only from some packages
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1. COWow, thanks a lot! This is (almost) perfect. If no better solutions are posted, I'll accept your answer and use this approach.
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