Example usage for org.springframework.util CollectionUtils findCommonElementType

Introduction

In this page you can find the example usage for org.springframework.util CollectionUtils findCommonElementType.

Prototype

@Nullable
public static Class<?> findCommonElementType(Collection<?> collection) 

Source Link

Document

Find the common element type of the given Collection, if any.

Usage

From source file:com.expedia.seiso.web.controller.delegate.BasicItemDelegate.java

private Object getListProperty(ApiVersion apiVersion, List<?> listPropValue, String view) {
    if (listPropValue == null) {
        return null;
    }/*from  ww  w. ja va  2 s  . c  o  m*/

    // Not sure I'm happy with this approach. Would it make more sense to require collection properties to declare
    // their type param (e.g. List<NodeIpAddress> instead of List) and then use reflection to grab the type? [WLW]
    if (listPropValue.isEmpty()) {
        return Collections.EMPTY_LIST;
    }

    val elemClass = CollectionUtils.findCommonElementType(listPropValue);
    val elemMeta = itemMetaLookup.getItemMeta(elemClass);
    val proj = elemMeta.getProjectionNode(apiVersion, Projection.Cardinality.COLLECTION, view);
    return resourceAssembler.toResourceList(apiVersion, listPropValue, proj);
}

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From source file:org.springframework.integration.aggregator.AbstractCorrelatingMessageHandler.java

private void verifyResultCollectionConsistsOfMessages(Collection<?> elements) {
    Class<?> commonElementType = CollectionUtils.findCommonElementType(elements);
    Assert.isAssignable(Message.class, commonElementType,
            "The expected collection of Messages contains non-Message element: " + commonElementType);
}

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