com.solace.spring.cloud.stream.binder.util.StaticMessageHeaderMapAccessor Maven / Gradle / Ivy

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package com.solace.spring.cloud.stream.binder.util;

import java.util.Map;

/**
 * Utility class to perform generic header accessing operations without needing to create a
 * {@link org.springframework.messaging.MessageHeaders MessageHeaders} object.
 */
public final class StaticMessageHeaderMapAccessor {
    public static  T get(Map headers, String key, Class type) {
        Object value = headers.get(key);
        if (value == null) {
            return null;
        }
        if (!type.isAssignableFrom(value.getClass())) {
            throw new IllegalArgumentException(String.format(
                    "Incorrect type specified for header '%s'. Expected [%s] but actual type is [%s]",
                    key, type, value.getClass()));
        }

        @SuppressWarnings("unchecked")
        T toReturn = (T) value;

        return toReturn;
    }
}