Examples of org.springframework.core.ParameterNameDiscoverer

org.springframework.core.ParameterNameDiscoverer
Interface to discover parameter names for methods and constructors.
Parameter name discovery is not always possible, but various strategies are available to try, such as looking for debug information that may have been emitted at compile time, and looking for argname annotation values optionally accompanying AspectJ annotated methods. @author Rod Johnson @author Adrian Colyer @since 2.0

        List<ParameterNameDiscoverer> discoverers = (List<ParameterNameDiscoverer>) ReflectionTestUtils
                .getField(discoverer, "parameterNameDiscoverers");


        assertThat(discoverers.size()).isEqualTo(2);


        ParameterNameDiscoverer annotationDisc = discoverers.get(0);
        assertThat(annotationDisc).isInstanceOf(
                AnnotationParameterNameDiscoverer.class);
        Set<String> annotationsToUse = (Set<String>)ReflectionTestUtils.getField(annotationDisc, "annotationClassesToUse");
        assertThat(annotationsToUse).containsOnly(P.class.getName());

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        assertThat(discoverers.size()).isEqualTo(3);
        assertThat(discoverers.get(0)).isInstanceOf(
                LocalVariableTableParameterNameDiscoverer.class);


        ParameterNameDiscoverer annotationDisc = discoverers.get(1);
        assertThat(annotationDisc).isInstanceOf(
                AnnotationParameterNameDiscoverer.class);
        Set<String> annotationsToUse = (Set<String>)ReflectionTestUtils.getField(annotationDisc, "annotationClassesToUse");
        assertThat(annotationsToUse).containsOnly(P.class.getName());

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        List<ParameterNameDiscoverer> discoverers = (List<ParameterNameDiscoverer>) ReflectionTestUtils
                .getField(discoverer, "parameterNameDiscoverers");


        assertThat(discoverers.size()).isEqualTo(2);


        ParameterNameDiscoverer annotationDisc = discoverers.get(0);
        assertThat(annotationDisc).isInstanceOf(
                AnnotationParameterNameDiscoverer.class);
        Set<String> annotationsToUse = (Set<String>)ReflectionTestUtils.getField(annotationDisc, "annotationClassesToUse");
        assertThat(annotationsToUse).containsOnly(P.class.getName());

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        assertThat(discoverers.size()).isEqualTo(3);
        assertThat(discoverers.get(0)).isInstanceOf(
                LocalVariableTableParameterNameDiscoverer.class);


        ParameterNameDiscoverer annotationDisc = discoverers.get(1);
        assertThat(annotationDisc).isInstanceOf(
                AnnotationParameterNameDiscoverer.class);
        Set<String> annotationsToUse = (Set<String>)ReflectionTestUtils.getField(annotationDisc, "annotationClassesToUse");
        assertThat(annotationsToUse).containsOnly(P.class.getName());

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            String[] paramNames = null;
            if (constructorPropertiesAnnotationAvailable) {
              paramNames = ConstructorPropertiesChecker.evaluateAnnotation(candidate, paramTypes.length);
            }
            if (paramNames == null) {
              ParameterNameDiscoverer pnd = this.beanFactory.getParameterNameDiscoverer();
              if (pnd != null) {
                paramNames = pnd.getParameterNames(candidate);
              }
            }
            argsHolder = createArgumentArray(
                beanName, mbd, resolvedValues, bw, paramTypes, paramNames, candidate, autowiring);
          }

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          if (resolvedValues != null) {
            // Resolved constructor arguments: type conversion and/or autowiring necessary.
            try {
              String[] paramNames = null;
              ParameterNameDiscoverer pnd = this.beanFactory.getParameterNameDiscoverer();
              if (pnd != null) {
                paramNames = pnd.getParameterNames(candidate);
              }
              argsHolder = createArgumentArray(
                  beanName, mbd, resolvedValues, bw, paramTypes, paramNames, candidate, autowiring);
            }
            catch (UnsatisfiedDependencyException ex) {

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            String[] paramNames = null;
            if (constructorPropertiesAnnotationAvailable) {
              paramNames = ConstructorPropertiesChecker.evaluateAnnotation(candidate, paramTypes.length);
            }
            if (paramNames == null) {
              ParameterNameDiscoverer pnd = this.beanFactory.getParameterNameDiscoverer();
              if (pnd != null) {
                paramNames = pnd.getParameterNames(candidate);
              }
            }
            args = createArgumentArray(
                beanName, mbd, resolvedValues, bw, paramTypes, paramNames, candidate, autowiring);
          }

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          if (resolvedValues != null) {
            // Resolved constructor arguments: type conversion and/or autowiring necessary.
            try {
              String[] paramNames = null;
              ParameterNameDiscoverer pnd = this.beanFactory.getParameterNameDiscoverer();
              if (pnd != null) {
                paramNames = pnd.getParameterNames(candidate);
              }
              args = createArgumentArray(
                  beanName, mbd, resolvedValues, bw, paramTypes, paramNames, candidate, autowiring);
            }
            catch (UnsatisfiedDependencyException ex) {

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        ArgumentsHolder argsHolder;
        if (resolvedValues != null) {
          try {
            String[] paramNames = ConstructorPropertiesChecker.evaluate(candidate, paramTypes.length);
            if (paramNames == null) {
              ParameterNameDiscoverer pnd = this.beanFactory.getParameterNameDiscoverer();
              if (pnd != null) {
                paramNames = pnd.getParameterNames(candidate);
              }
            }
            argsHolder = createArgumentArray(
                beanName, mbd, resolvedValues, bw, paramTypes, paramNames, candidate, autowiring);
          }

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          if (resolvedValues != null) {
            // Resolved constructor arguments: type conversion and/or autowiring necessary.
            try {
              String[] paramNames = null;
              ParameterNameDiscoverer pnd = this.beanFactory.getParameterNameDiscoverer();
              if (pnd != null) {
                paramNames = pnd.getParameterNames(candidate);
              }
              argsHolder = createArgumentArray(
                  beanName, mbd, resolvedValues, bw, paramTypes, paramNames, candidate, autowiring);
            }
            catch (UnsatisfiedDependencyException ex) {

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