Example usage for com.fasterxml.jackson.databind.util EnumResolver findEnum

Introduction

In this page you can find the example usage for com.fasterxml.jackson.databind.util EnumResolver findEnum.

Prototype

public T findEnum(String paramString) 

Source Link

Usage

From source file:org.apache.pulsar.common.util.FieldParser.java

/**
 * Convert the given object value to the given class.
 *
 * @param from//from  w  ww  . j a  v  a2 s .c  om
 *            The object value to be converted.
 * @param to
 *            The type class which the given object should be converted to.
 * @return The converted object value.
 * @throws UnsupportedOperationException
 *             If no suitable converter can be found.
 * @throws RuntimeException
 *             If conversion failed somehow. This can be caused by at least an ExceptionInInitializerError,
 *             IllegalAccessException or InvocationTargetException.
 */
@SuppressWarnings("unchecked")
public static <T> T convert(Object from, Class<T> to) {

    checkNotNull(to);
    if (from == null) {
        return null;
    }

    to = (Class<T>) wrap(to);
    // Can we cast? Then just do it.
    if (to.isAssignableFrom(from.getClass())) {
        return to.cast(from);
    }

    // Lookup the suitable converter.
    String converterId = from.getClass().getName() + "_" + to.getName();
    Method converter = CONVERTERS.get(converterId);

    if (to.isEnum()) {
        // Converting string to enum
        EnumResolver r = EnumResolver.constructUsingToString((Class<Enum<?>>) to, null);
        T value = (T) r.findEnum((String) from);
        if (value == null) {
            throw new RuntimeException("Invalid value '" + from + "' for enum " + to);
        }
        return value;
    }

    if (converter == null) {
        throw new UnsupportedOperationException("Cannot convert from " + from.getClass().getName() + " to "
                + to.getName() + ". Requested converter does not exist.");
    }

    // Convert the value.
    try {
        Object val = converter.invoke(to, from);
        return to.cast(val);
    } catch (Exception e) {
        throw new RuntimeException("Cannot convert from " + from.getClass().getName() + " to " + to.getName()
                + ". Conversion failed with " + e.getMessage(), e);
    }
}

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