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Java example source code file (ElementSourceTest.java)

This example Java source code file (ElementSourceTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractmodule, annotation, binder_install, binding, don't, elementsource, list, modulesource, override, recordingbinder, sampleannotation, source, stacktraceelement, unknown, util

The ElementSourceTest.java Java example source code

package com.google.inject.spi;

import static com.google.inject.internal.InternalFlags.getIncludeStackTraceOption;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import com.google.inject.AbstractModule;
import com.google.inject.Binder;
import com.google.inject.Binding;
import com.google.inject.BindingAnnotation;
import com.google.inject.Module;

import junit.framework.TestCase;

import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import java.util.List;

/**
 * Tests for {@link ElementSource}.
 */
public class ElementSourceTest extends TestCase {

  private static final StackTraceElement BINDER_INSTALL = 
      new StackTraceElement("com.google.inject.spi.Elements$RecordingBinder", "install", 
          "Unknown Source", 234 /* line number*/);
  
  public void testCallStackSize() {
    ModuleSource moduleSource = createModuleSource();
    StackTraceElement[] bindingCallStack = new StackTraceElement[3];
    bindingCallStack[0] = new StackTraceElement(
        "com.google.inject.spi.Elements$RecordingBinder", "bind", "Unknown Source", 200);
    bindingCallStack[1] = new StackTraceElement(
        "com.google.inject.spi.Elements$RecordingBinder", "bind", "Unknown Source", 100);
    bindingCallStack[2] = new StackTraceElement(
        "com.google.inject.spi.moduleSourceTest$C", "configure", "Unknown Source", 100);
    ElementSource elementSource = new ElementSource(
        null /* No original element source */, "" /* Don't care */, moduleSource, bindingCallStack);
    assertEquals(10 /* call stack size */, elementSource.getStackTrace().length);
  }  

  public void testGetCallStack_IntegrationTest() throws Exception {
    List<Element> elements = Elements.getElements(new A());
    for (Element element : elements) {
      if (element instanceof Binding) {
        Binding<?> binding = (Binding) element;
        Class<? extends Annotation> annotationType = binding.getKey().getAnnotationType();
        if (annotationType != null && annotationType.equals(SampleAnnotation.class)) {
          ElementSource elementSource = (ElementSource) binding.getSource();
          List<String> moduleClassNames = elementSource.getModuleClassNames();
          // Check module class names
          // Module C
          assertEquals("com.google.inject.spi.ElementSourceTest$C", moduleClassNames.get(0));
          // Module B
          assertEquals("com.google.inject.spi.ElementSourceTest$B", moduleClassNames.get(1));
          // Module A
          assertEquals("com.google.inject.spi.ElementSourceTest$A", moduleClassNames.get(2));
          StackTraceElement[] callStack = elementSource.getStackTrace();
          switch(getIncludeStackTraceOption()) {
            case OFF:
              // Check declaring source
              StackTraceElement stackTraceElement = 
                  (StackTraceElement) elementSource.getDeclaringSource();
              assertEquals(new StackTraceElement(
                  "com.google.inject.spi.ElementSourceTest$C", "configure", null, -1), 
                  stackTraceElement);
              // Check call stack
              assertEquals(0, callStack.length);
              return;
            case ONLY_FOR_DECLARING_SOURCE:
                // Check call stack
                assertEquals(0, callStack.length);
                return;
            case COMPLETE:
              // Check call stack
              int skippedCallStackSize = new Throwable().getStackTrace().length - 1;
              assertEquals(skippedCallStackSize + 15, elementSource.getStackTrace().length);
              assertEquals("com.google.inject.spi.Elements$RecordingBinder",
                  callStack[0].getClassName());
              assertEquals("com.google.inject.spi.Elements$RecordingBinder",
                  callStack[1].getClassName());
              assertEquals("com.google.inject.AbstractModule",
                  callStack[2].getClassName());
              // Module C
              assertEquals("com.google.inject.spi.ElementSourceTest$C",
                  callStack[3].getClassName());
              assertEquals("configure",
                  callStack[3].getMethodName());
              assertEquals("Unknown Source",
                  callStack[3].getFileName());
              assertEquals("com.google.inject.AbstractModule",
                  callStack[4].getClassName());
              assertEquals("com.google.inject.spi.Elements$RecordingBinder",
                  callStack[5].getClassName());
              // Module B
              assertEquals("com.google.inject.spi.ElementSourceTest$B",
                  callStack[6].getClassName());
              assertEquals("com.google.inject.spi.Elements$RecordingBinder",
                  callStack[7].getClassName());
              // Module A
              assertEquals("com.google.inject.AbstractModule",
                  callStack[8].getClassName());
              assertEquals("com.google.inject.spi.ElementSourceTest$A",
                  callStack[9].getClassName());
              assertEquals("com.google.inject.AbstractModule",
                  callStack[10].getClassName());
              assertEquals("com.google.inject.spi.Elements$RecordingBinder",
                  callStack[11].getClassName());
              assertEquals("com.google.inject.spi.Elements",
                  callStack[12].getClassName());
              assertEquals("com.google.inject.spi.Elements",
                  callStack[13].getClassName());
              assertEquals("com.google.inject.spi.ElementSourceTest",
                  callStack[14].getClassName());
              // Check modules index
              List<Integer> indexes = elementSource.getModuleConfigurePositionsInStackTrace();
              assertEquals((int) indexes.get(0), 4);
              assertEquals((int) indexes.get(1), 6);
              assertEquals((int) indexes.get(2), 10);
              return;
          }
        }
      }
    }
    fail("The test should not reach this line.");
  }  

  private ModuleSource createModuleSource() {
    // First module
    StackTraceElement[] partialCallStack = new StackTraceElement[1];
    partialCallStack[0] = BINDER_INSTALL;    
    ModuleSource moduleSource = new ModuleSource(new A(), partialCallStack);
    // Second module 
    partialCallStack = new StackTraceElement[2];
    partialCallStack[0] = BINDER_INSTALL;
    partialCallStack[1] = new StackTraceElement(
        "com.google.inject.spi.moduleSourceTest$A", "configure", "Unknown Source", 100);
    moduleSource = moduleSource.createChild(new B(), partialCallStack);    
    // Third module
    partialCallStack = new StackTraceElement[4];
    partialCallStack[0] = BINDER_INSTALL;
    partialCallStack[1] = new StackTraceElement("class1", "method1", "Class1.java", 1);
    partialCallStack[2] = new StackTraceElement("class2", "method2", "Class2.java", 2);
    partialCallStack[3] = new StackTraceElement(
        "com.google.inject.spi.moduleSourceTest$B", "configure", "Unknown Source", 200);
    return moduleSource.createChild(new C(), partialCallStack);
  }

  private static class A extends AbstractModule {
    @Override
    public void configure() {
      install(new B());
    }
  }
  
  private static class B implements Module {
    @Override
    public void configure(Binder binder) {
      binder.install(new C());
    }
  }
  
  @Retention(RUNTIME)
  @Target({ ElementType.FIELD, ElementType.PARAMETER, ElementType.METHOD })
  @BindingAnnotation
  @interface SampleAnnotation { }

  private static class C extends AbstractModule {
    @Override
    public void configure() {
      bind(String.class).annotatedWith(SampleAnnotation.class).toInstance("the value");
    }
  }  
}

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