Example usage for org.apache.hadoop.conf Configuration getClasses

Introduction

In this page you can find the example usage for org.apache.hadoop.conf Configuration getClasses.

Prototype

public Class<?>[] getClasses(String name, Class<?>... defaultValue) 

Source Link

Document

Get the value of the name property as an array of Class.

Usage

From source file:com.facebook.hiveio.conf.ClassConfOption.java

License:Apache License

/**
 * Get classes from a property that all implement a given interface.
 *
 * @param conf Configuration//  w ww  .  j  a  va2  s  . c o  m
 * @param name String name of property to fetch.
 * @param xface interface classes must implement.
 * @param defaultValue If not found, return this
 * @param <T> Generic type of interface class
 * @return array of Classes implementing interface specified.
 */
public static <T> Class<? extends T>[] getClassesOfType(Configuration conf, String name, Class<T> xface,
        Class<? extends T>... defaultValue) {
    Class<?>[] klasses = conf.getClasses(name, defaultValue);
    for (Class<?> klass : klasses) {
        if (!xface.isAssignableFrom(klass)) {
            throw new RuntimeException(klass + " is not assignable from " + xface.getName());
        }
    }
    return (Class<? extends T>[]) klasses;
}

---

From source file:com.topsoft.botspider.io.UnionData.java

License:Apache License

@Override
@SuppressWarnings("rawtypes")
public Schema getSchema(Configuration conf) {

    Class[] parseClass = null;//from   w w w .  j a v a2s . co  m
    if (conf != null) {
        parseClass = conf.getClasses(UNION_CLASS, null);
    }

    List<Schema> branches = new ArrayList<Schema>();
    branches.add(Schema.create(Schema.Type.NULL));
    if (parseClass != null) {
        for (Class branch : parseClass) {
            branches.add(ReflectData.get().getSchema(branch));
        }

    }
    Schema field = Schema.createUnion(branches);
    Schema schema = Schema.createRecord(UnionData.class.getName(), null, null, false);
    ArrayList<Field> fields = new ArrayList<Field>();
    fields.add(new Field("datum", field, null, null));
    schema.setFields(fields);
    return schema;
}

---