Example usage for java.lang.reflect Method getParameterCount

Introduction

In this page you can find the example usage for java.lang.reflect Method getParameterCount.

Prototype

public int getParameterCount() 

Source Link

Usage

From source file:net.radai.beanz.util.ReflectionUtil.java

public static String prettyPrint(Method method) {
    StringBuilder sb = new StringBuilder();
    Class<?> declaredOn = method.getDeclaringClass();
    sb.append(prettyPrint(declaredOn)).append(".").append(method.getName()).append("(");
    if (method.getParameterCount() > 0) {
        for (Type paramType : method.getGenericParameterTypes()) {
            sb.append(prettyPrint(paramType)).append(", ");
        }//from  w w w . jav a  2 s .c  o  m
        sb.delete(sb.length() - 2, sb.length());
    }
    sb.append(")");
    return sb.toString();
}

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From source file:org.springframework.beans.BeanUtils.java

/**
 * Find a method with the given method name and minimal parameters (best case: none)
 * in the given list of methods.//w  w  w . j a  v  a 2 s .  c o m
 * @param methods the methods to check
 * @param methodName the name of the method to find
 * @return the Method object, or {@code null} if not found
 * @throws IllegalArgumentException if methods of the given name were found but
 * could not be resolved to a unique method with minimal parameters
 */
@Nullable
public static Method findMethodWithMinimalParameters(Method[] methods, String methodName)
        throws IllegalArgumentException {

    Method targetMethod = null;
    int numMethodsFoundWithCurrentMinimumArgs = 0;
    for (Method method : methods) {
        if (method.getName().equals(methodName)) {
            int numParams = method.getParameterCount();
            if (targetMethod == null || numParams < targetMethod.getParameterCount()) {
                targetMethod = method;
                numMethodsFoundWithCurrentMinimumArgs = 1;
            } else if (!method.isBridge() && targetMethod.getParameterCount() == numParams) {
                if (targetMethod.isBridge()) {
                    // Prefer regular method over bridge...
                    targetMethod = method;
                } else {
                    // Additional candidate with same length
                    numMethodsFoundWithCurrentMinimumArgs++;
                }
            }
        }
    }
    if (numMethodsFoundWithCurrentMinimumArgs > 1) {
        throw new IllegalArgumentException("Cannot resolve method '" + methodName
                + "' to a unique method. Attempted to resolve to overloaded method with "
                + "the least number of parameters but there were " + numMethodsFoundWithCurrentMinimumArgs
                + " candidates.");
    }
    return targetMethod;
}

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From source file:org.springframework.cloud.stream.reactive.StreamEmitterAnnotationBeanPostProcessor.java

private static void validateStreamEmitterMethod(Method method, int outputAnnotationCount,
        String methodAnnotatedOutboundName) {

    if (StringUtils.hasText(methodAnnotatedOutboundName)) {
        Assert.isTrue(outputAnnotationCount == 0, StreamEmitterErrorMessages.INVALID_OUTPUT_METHOD_PARAMETERS);
    } else {//from ww w. jav a  2s.  co m
        Assert.isTrue(outputAnnotationCount > 0, StreamEmitterErrorMessages.NO_OUTPUT_SPECIFIED);
    }

    if (!method.getReturnType().equals(Void.TYPE)) {
        Assert.isTrue(StringUtils.hasText(methodAnnotatedOutboundName),
                StreamEmitterErrorMessages.RETURN_TYPE_NO_OUTBOUND_SPECIFIED);
        Assert.isTrue(method.getParameterCount() == 0, StreamEmitterErrorMessages.RETURN_TYPE_METHOD_ARGUMENTS);
    } else {
        if (!StringUtils.hasText(methodAnnotatedOutboundName)) {
            int methodArgumentsLength = method.getParameterTypes().length;
            for (int parameterIndex = 0; parameterIndex < methodArgumentsLength; parameterIndex++) {
                MethodParameter methodParameter = new MethodParameter(method, parameterIndex);
                if (methodParameter.hasParameterAnnotation(Output.class)) {
                    String outboundName = (String) AnnotationUtils
                            .getValue(methodParameter.getParameterAnnotation(Output.class));
                    Assert.isTrue(StringUtils.hasText(outboundName),
                            StreamEmitterErrorMessages.INVALID_OUTBOUND_NAME);
                } else {
                    throw new IllegalArgumentException(
                            StreamEmitterErrorMessages.OUTPUT_ANNOTATION_MISSING_ON_METHOD_PARAMETERS_VOID_RETURN_TYPE);
                }
            }
        }
    }
}

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From source file:org.springframework.web.servlet.mvc.method.annotation.MvcUriComponentsBuilder.java

private static UriComponents applyContributors(UriComponentsBuilder builder, Method method, Object... args) {
    CompositeUriComponentsContributor contributor = getConfiguredUriComponentsContributor();
    if (contributor == null) {
        logger.debug("Using default CompositeUriComponentsContributor");
        contributor = defaultUriComponentsContributor;
    }/*from   w ww .ja  v a2s . c om*/

    int paramCount = method.getParameterCount();
    int argCount = args.length;
    if (paramCount != argCount) {
        throw new IllegalArgumentException("Number of method parameters " + paramCount
                + " does not match number of argument values " + argCount);
    }

    final Map<String, Object> uriVars = new HashMap<>();
    for (int i = 0; i < paramCount; i++) {
        MethodParameter param = new SynthesizingMethodParameter(method, i);
        param.initParameterNameDiscovery(parameterNameDiscoverer);
        contributor.contributeMethodArgument(param, args[i], builder, uriVars);
    }

    // We may not have all URI var values, expand only what we have
    return builder.build().expand(new UriComponents.UriTemplateVariables() {
        @Override
        public Object getValue(@Nullable String name) {
            return uriVars.containsKey(name) ? uriVars.get(name)
                    : UriComponents.UriTemplateVariables.SKIP_VALUE;
        }
    });
}

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From source file:org.springframework.boot.test.context.assertj.AssertProviderApplicationContextInvocationHandler.java

private boolean isCloseMethod(Method method) {
    return ("close".equals(method.getName()) && method.getParameterCount() == 0);
}

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From source file:org.springframework.boot.test.context.assertj.AssertProviderApplicationContextInvocationHandler.java

private boolean isToString(Method method) {
    return ("toString".equals(method.getName()) && method.getParameterCount() == 0);
}

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From source file:com.haulmont.cuba.gui.xml.DeclarativeColumnGenerator.java

protected Method findGeneratorMethod(Class cls, String methodName) {
    Method exactMethod = MethodUtils.getAccessibleMethod(cls, methodName, Entity.class);
    if (exactMethod != null) {
        return exactMethod;
    }/*from   w  w w .  jav  a2  s.c o  m*/

    // search through all methods
    Method[] methods = cls.getMethods();
    for (Method availableMethod : methods) {
        if (availableMethod.getName().equals(methodName)) {
            if (availableMethod.getParameterCount() == 1
                    && Component.class.isAssignableFrom(availableMethod.getReturnType())) {
                if (Entity.class.isAssignableFrom(availableMethod.getParameterTypes()[0])) {
                    // get accessible version of method
                    return MethodUtils.getAccessibleMethod(availableMethod);
                }
            }
        }
    }
    return null;
}

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From source file:org.springframework.aop.framework.adapter.ThrowsAdviceInterceptor.java

private void invokeHandlerMethod(MethodInvocation mi, Throwable ex, Method method) throws Throwable {
    Object[] handlerArgs;// w ww . j  a va  2  s  .  c o m
    if (method.getParameterCount() == 1) {
        handlerArgs = new Object[] { ex };
    } else {
        handlerArgs = new Object[] { mi.getMethod(), mi.getArguments(), mi.getThis(), ex };
    }
    try {
        method.invoke(this.throwsAdvice, handlerArgs);
    } catch (InvocationTargetException targetEx) {
        throw targetEx.getTargetException();
    }
}

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From source file:org.springframework.boot.test.context.assertj.AssertProviderApplicationContextInvocationHandler.java

private boolean isAssertThat(Method method) {
    return ("assertThat".equals(method.getName()) && method.getParameterCount() == 0);
}

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From source file:com.googlecode.jdbcproc.daofactory.impl.block.service.OutputParametersGetterBlockServiceImpl.java

private int findEntityParameterIndex(Method daoMethod) {
    int entityParameterIndex = -1;
    for (int i = 0; i < daoMethod.getParameterCount(); i++) {
        if (!BlockFactoryUtils.isSimpleOrListType(daoMethod.getParameterTypes()[i])) {
            entityParameterIndex = i;//from   www . j a  v a2  s .co  m
            break;
        }
    }
    Assert.isTrue(entityParameterIndex >= 0,
            "Did not find an entity parameter, although this is an entity (probably with lists)");
    return entityParameterIndex;
}

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