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org.picocontainer.behaviors.InterceptingTestCase Maven / Gradle / Ivy
/*****************************************************************************
* 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;
import org.picocontainer.containers.EmptyPicoContainer;
import org.picocontainer.lifecycle.NullLifecycleStrategy;
public class InterceptingTestCase {
public static interface Person {
String greeting();
String parting(String who);
void sleep(int howLong);
public static class nullobject implements Person {
public String greeting() {
return null;
}
public String parting(String who) {
return null;
}
public void sleep(int howLong) {
}
}
}
public static class Englishman implements Person {
private StringBuilder sb;
public Englishman(StringBuilder sb) {
this.sb = sb;
}
public String greeting() {
String phrase = "How do you do?";
sb.append(phrase);
return phrase;
}
public String parting(String who) {
String phrase = "Goodbye " + who + ".";
sb.append(phrase);
return phrase;
}
public void sleep(int howLong) {
sb.append("Nap for " + howLong);
}
}
@Test public void testPreAndPostObservation() {
final StringBuilder sb = new StringBuilder();
DefaultPicoContainer pico = new DefaultPicoContainer(new Intercepting(), new NullLifecycleStrategy(), new EmptyPicoContainer());
pico.addComponent(StringBuilder.class, sb);
pico.addComponent(Person.class, Englishman.class);
Intercepted intercepted = pico.getComponentAdapter(Person.class).findAdapterOfType(Intercepted.class);
final Intercepted.Controller interceptor = intercepted.getController();
intercepted.addPostInvocation(Person.class, new Person.nullobject() {
public String greeting() {
sb.append("");
return null;
}
});
intercepted.addPreInvocation(Person.class, new Person.nullobject() {
public String greeting() {
sb.append("");
return null;
}
});
Person foo = pico.getComponent(Person.class);
assertNotNull(foo);
assertEquals("How do you do?", foo.greeting());
assertEquals("How do you do? ", sb.toString());
assertEquals("Intercepted:ConstructorInjector-interface org.picocontainer.behaviors.InterceptingTestCase$Person", pico.getComponentAdapter(Person.class).toString());
}
@Test public void testPreAndPostObservationWithParameter() {
final StringBuilder sb = new StringBuilder();
DefaultPicoContainer pico = new DefaultPicoContainer(new Intercepting(), new NullLifecycleStrategy(), new EmptyPicoContainer());
pico.addComponent(StringBuilder.class, sb);
pico.addComponent(Person.class, Englishman.class);
Intercepted intercepted = pico.getComponentAdapter(Person.class).findAdapterOfType(Intercepted.class);
final Intercepted.Controller interceptor = intercepted.getController();
intercepted.addPostInvocation(Person.class, new Person.nullobject() {
public String parting(String a) {
assertEquals("Goodbye Fred.", interceptor.getOriginalRetVal().toString());
sb.append("");
return null;
}
});
intercepted.addPreInvocation(Person.class, new Person.nullobject() {
public String parting(String who) {
sb.append("");
return null;
}
});
Person foo = pico.getComponent(Person.class);
assertNotNull(foo);
assertEquals("Goodbye Fred.", foo.parting("Fred").trim());
assertEquals("Goodbye Fred. ", sb.toString());
assertEquals("Intercepted:ConstructorInjector-interface org.picocontainer.behaviors.InterceptingTestCase$Person", pico.getComponentAdapter(Person.class).toString());
}
@Test public void testPreCanPreventInvocationWithAlternateReturnValue() {
final StringBuilder sb = new StringBuilder();
DefaultPicoContainer pico = new DefaultPicoContainer(new Intercepting(), new NullLifecycleStrategy(), new EmptyPicoContainer());
pico.addComponent(Person.class, Englishman.class);
pico.addComponent(StringBuilder.class, sb);
Intercepted intercepted = pico.getComponentAdapter(Person.class).findAdapterOfType(Intercepted.class);
final Intercepted.Controller interceptor = intercepted.getController();
intercepted.addPreInvocation(Person.class, new Person.nullobject() {
public String parting(String who) {
interceptor.veto();
return "Au revoir " + who + ".";
}
});
Person foo = pico.getComponent(Person.class);
assertNotNull(foo);
assertEquals("Au revoir Fred.", foo.parting("Fred"));
assertEquals("", sb.toString());
assertEquals("Intercepted:ConstructorInjector-interface org.picocontainer.behaviors.InterceptingTestCase$Person", pico.getComponentAdapter(Person.class).toString());
}
@Test public void testOverrideOfReturnValue() {
final StringBuilder sb = new StringBuilder();
DefaultPicoContainer pico = new DefaultPicoContainer(new Intercepting(), new NullLifecycleStrategy(), new EmptyPicoContainer());
pico.addComponent(Person.class, Englishman.class);
pico.addComponent(StringBuilder.class, sb);
Intercepted intercepted = pico.getComponentAdapter(Person.class).findAdapterOfType(Intercepted.class);
final Intercepted.Controller interceptor = intercepted.getController();
intercepted.addPreInvocation(Person.class, new Person.nullobject() {
public String parting(String who) {
sb.append("[Before parting]");
return null;
}
});
intercepted.addPostInvocation(Person.class, new Person() {
public String greeting() {
return null;
}
public String parting(String who) {
interceptor.override();
sb.append("[After parting]");
return "Arrivederci " + who;
}
public void sleep(int howLong) {
}
});
Person foo = pico.getComponent(Person.class);
assertNotNull(foo);
assertEquals("Arrivederci Fred", foo.parting("Fred"));
assertEquals("[Before parting]Goodbye Fred.[After parting]", sb.toString());
assertEquals("Intercepted:ConstructorInjector-interface org.picocontainer.behaviors.InterceptingTestCase$Person", pico.getComponentAdapter(Person.class).toString());
}
@Test public void testNothingHappensIfNoPreOrPost() {
final StringBuilder sb = new StringBuilder();
DefaultPicoContainer pico = new DefaultPicoContainer(new Intercepting(), new NullLifecycleStrategy(), new EmptyPicoContainer());
pico.addComponent(Person.class, Englishman.class);
pico.addComponent(StringBuilder.class, sb);
Person foo = pico.getComponent(Person.class);
assertNotNull(foo);
assertEquals("Goodbye Fred.", foo.parting("Fred"));
assertEquals("Goodbye Fred.", sb.toString());
assertEquals("Intercepted:ConstructorInjector-interface org.picocontainer.behaviors.InterceptingTestCase$Person", pico.getComponentAdapter(Person.class).toString());
}
}
