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/*****************************************************************************
* Copyright (C) PicoContainer Organization. All rights reserved. *
* ------------------------------------------------------------------------- *
* The software in this package is published under the terms of the BSD *
* style license a copy of which has been included with this distribution in *
* the LICENSE.txt file. *
* *
* Original code by *
*****************************************************************************/
package org.picocontainer.behaviors;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import org.junit.Test;
import org.picocontainer.DefaultPicoContainer;
public class InterceptingTestCase {
public static interface Foo {
void one();
String two(String a, int b);
}
public static class FooImpl implements Foo {
private StringBuilder sb;
public FooImpl(StringBuilder sb) {
this.sb = sb;
}
public void one() {
sb.append("call-one(),");
}
public String two(String a, int b) {
sb.append("call-two('"+a+"',"+b+"),");
return "two";
}
}
@Test public void testPreAndPostObservation() {
final StringBuilder sb = new StringBuilder();
DefaultPicoContainer pico = new DefaultPicoContainer(new Intercepting());
pico.addComponent(StringBuilder.class, sb);
pico.addComponent(Foo.class, FooImpl.class);
Intercepted intercepted = pico.getComponentAdapter(Foo.class).findAdapterOfType(Intercepted.class);
final Intercepted.Controller interceptor = intercepted.getController();
intercepted.addPreInvocation(Foo.class, new Foo() {
public void one() {
sb.append("pre-one(),");
}
public String two(String a, int b) {
sb.append("pre-two('"+a+"',"+b+"),");
return null;
}
});
intercepted.addPostInvocation(Foo.class, new Foo() {
public void one() {
sb.append("post-one(),");
}
public String two(String a, int b) {
assertEquals("two", interceptor.getOriginalRetVal());
sb.append("post-two('"+a+"',"+b+"),");
return null;
}
});
Foo foo = pico.getComponent(Foo.class);
assertNotNull(foo);
foo.one();
assertEquals("two", foo.two("hello", 99));
assertEquals("pre-one(),call-one(),post-one(),pre-two('hello',99),call-two('hello',99),post-two('hello',99),", sb.toString());
assertEquals("Intercepted:ConstructorInjector-interface org.picocontainer.behaviors.InterceptingTestCase$Foo", pico.getComponentAdapter(Foo.class).toString());
}
@Test public void testPreCanBlockInvocationWithAlternateReturnValue() {
final StringBuilder sb = new StringBuilder();
DefaultPicoContainer pico = new DefaultPicoContainer(new Intercepting());
pico.addComponent(Foo.class, FooImpl.class);
pico.addComponent(StringBuilder.class, sb);
Intercepted intercepted = pico.getComponentAdapter(Foo.class).findAdapterOfType(Intercepted.class);
final Intercepted.Controller interceptor = intercepted.getController();
intercepted.addPreInvocation(Foo.class, new Foo() {
public void one() {
interceptor.veto();
sb.append("veto-one(),");
}
public String two(String a, int b) {
interceptor.veto();
sb.append("veto-two('"+a+"',"+b+"),");
return "isVetoed";
}
});
Foo foo = pico.getComponent(Foo.class);
assertNotNull(foo);
foo.one();
assertEquals("isVetoed", foo.two("hello", 99));
assertEquals("veto-one(),veto-two('hello',99),", sb.toString());
assertEquals("Intercepted:ConstructorInjector-interface org.picocontainer.behaviors.InterceptingTestCase$Foo", pico.getComponentAdapter(Foo.class).toString());
}
@Test public void testOverrideOfReturnValue() {
final StringBuilder sb = new StringBuilder();
DefaultPicoContainer pico = new DefaultPicoContainer(new Intercepting());
pico.addComponent(Foo.class, FooImpl.class);
pico.addComponent(StringBuilder.class, sb);
Intercepted intercepted = pico.getComponentAdapter(Foo.class).findAdapterOfType(Intercepted.class);
final Intercepted.Controller interceptor = intercepted.getController();
intercepted.addPreInvocation(Foo.class, new Foo() {
public void one() {
sb.append("pre-one(),");
}
public String two(String a, int b) {
sb.append("pre-two('"+a+"',"+b+"),");
return null;
}
});
intercepted.addPostInvocation(Foo.class, new Foo() {
public void one() {
interceptor.override();
sb.append("override-one(),");
}
public String two(String a, int b) {
interceptor.override();
sb.append("override-two('"+a+"',"+b+"),");
return "x";
}
});
Foo foo = pico.getComponent(Foo.class);
assertNotNull(foo);
foo.one();
assertEquals("x", foo.two("hello", 99));
assertEquals("pre-one(),call-one(),override-one(),pre-two('hello',99),call-two('hello',99),override-two('hello',99),", sb.toString());
assertEquals("Intercepted:ConstructorInjector-interface org.picocontainer.behaviors.InterceptingTestCase$Foo", pico.getComponentAdapter(Foo.class).toString());
}
@Test public void testNothingHappensIfNoPreOrPost() {
final StringBuilder sb = new StringBuilder();
DefaultPicoContainer pico = new DefaultPicoContainer(new Intercepting());
pico.addComponent(Foo.class, FooImpl.class);
pico.addComponent(StringBuilder.class, sb);
Foo foo = pico.getComponent(Foo.class);
assertNotNull(foo);
foo.one();
assertEquals("two", foo.two("hello", 99));
assertEquals("call-one(),call-two('hello',99),", sb.toString());
assertEquals("Intercepted:ConstructorInjector-interface org.picocontainer.behaviors.InterceptingTestCase$Foo", pico.getComponentAdapter(Foo.class).toString());
}
}
