src/test/org/apache/hcatalog/data/schema/TestHCatSchemaUtils.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hcatalog.data.schema;

import java.io.PrintStream;

import junit.framework.TestCase;

import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoUtils;
import org.apache.hcatalog.common.HCatException;
import org.apache.hcatalog.data.schema.HCatFieldSchema.Category;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class TestHCatSchemaUtils extends TestCase {

    private static final Logger LOG = LoggerFactory.getLogger(TestHCatSchemaUtils.class);

    public void testSimpleOperation() throws Exception {
        String typeString = "struct<name:string,studentid:int,"
                + "contact:struct<phno:string,email:string>,"
                + "currently_registered_courses:array<string>,"
                + "current_grades:map<string,string>,"
                + "phnos:array<struct<phno:string,type:string>>,blah:array<int>>";

        TypeInfo ti = TypeInfoUtils.getTypeInfoFromTypeString(typeString);

        HCatSchema hsch = HCatSchemaUtils.getHCatSchemaFromTypeString(typeString);
        LOG.info("Type name : {}", ti.getTypeName());
        LOG.info("HCatSchema : {}", hsch);
        assertEquals(hsch.size(), 1);
        assertEquals(ti.getTypeName(), hsch.get(0).getTypeString());
        assertEquals(hsch.get(0).getTypeString(), typeString);
    }

    @SuppressWarnings("unused")
    private void pretty_print(PrintStream pout, HCatSchema hsch) throws HCatException {
        pretty_print(pout, hsch, "");
    }


    private void pretty_print(PrintStream pout, HCatSchema hsch, String prefix) throws HCatException {
        int i = 0;
        for (HCatFieldSchema field : hsch.getFields()) {
            pretty_print(pout, field, prefix + "." + (field.getName() == null ? i : field.getName()));
            i++;
        }
    }

    private void pretty_print(PrintStream pout, HCatFieldSchema hfsch, String prefix) throws HCatException {

        Category tcat = hfsch.getCategory();
        if (Category.STRUCT == tcat) {
            pretty_print(pout, hfsch.getStructSubSchema(), prefix);
        } else if (Category.ARRAY == tcat) {
            pretty_print(pout, hfsch.getArrayElementSchema(), prefix);
        } else if (Category.MAP == tcat) {
            pout.println(prefix + ".mapkey:\t" + hfsch.getMapKeyType().toString());
            pretty_print(pout, hfsch.getMapValueSchema(), prefix + ".mapvalue:");
        } else {
            pout.println(prefix + "\t" + hfsch.getType().toString());
        }
    }

}