1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/samples/codeinjection/src/org/apidesign/codeinjection/CountDownImplV2.java	Sat Jan 10 21:29:22 2009 +0100
     1.3 @@ -0,0 +1,44 @@
     1.4 +/*
     1.5 + * To change this template, choose Tools | Templates
     1.6 + * and open the template in the editor.
     1.7 + */
     1.8 +
     1.9 +package org.apidesign.codeinjection;
    1.10 +
    1.11 +import java.util.Iterator;
    1.12 +import java.util.ServiceLoader;
    1.13 +import org.apidesign.codeinjection.spi.CountDownExtender;
    1.14 +
    1.15 +/** Second version to {@link CountDownImplV1} - imagine someone wants to
    1.16 + * reimplement {@link #down()} method to decrement by two not just by one.
    1.17 + * You do not like that idea at all, but you do not want to prevent such
    1.18 + * behaviour. You just do not want to maintain such bloody code. What can
    1.19 + * you do? You need to allow <b>code injection</b> via the
    1.20 + * {@link CountDownExtender} class!
    1.21 + *
    1.22 + * @author Jaroslav Tulach <jtulach@netbeans.org>
    1.23 + */
    1.24 +final class CountDownImplV2 extends CountDown {
    1.25 +    private int cnt;
    1.26 +
    1.27 +    CountDownImplV2(int initial) {
    1.28 +        this.cnt = initial;
    1.29 +    }
    1.30 +
    1.31 +// BEGIN: codeinjection.v2
    1.32 +    public void down() {
    1.33 +        Iterator<CountDownExtender> it = ServiceLoader.load(CountDownExtender.class).iterator();
    1.34 +        if (it.hasNext()) {
    1.35 +            // injected behaviour
    1.36 +            cnt = it.next().decrement(cnt);
    1.37 +        } else {
    1.38 +            // common behaviour of 1.0 version
    1.39 +            cnt--;
    1.40 +        }
    1.41 +    }
    1.42 +
    1.43 +    public boolean isDown() {
    1.44 +        return cnt <= 0;
    1.45 +    }
    1.46 +// END: codeinjection.v2
    1.47 +}