src/test/org/apache/hcatalog/data/schema/TestHCatSchema.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 junit.framework.TestCase;
import org.apache.hcatalog.common.HCatException;

import java.util.ArrayList;
import java.util.List;

public class TestHCatSchema extends TestCase {
    public void testCannotAddFieldMoreThanOnce() throws HCatException {
        List<HCatFieldSchema> fieldSchemaList = new ArrayList<HCatFieldSchema>();
        fieldSchemaList.add(new HCatFieldSchema("name", HCatFieldSchema.Type.STRING, "What's your handle?"));
        fieldSchemaList.add(new HCatFieldSchema("age", HCatFieldSchema.Type.INT, "So very old"));

        HCatSchema schema = new HCatSchema(fieldSchemaList);

        assertTrue(schema.getFieldNames().contains("age"));
        assertEquals(2, schema.getFields().size());

        try {
            schema.append(new HCatFieldSchema("age", HCatFieldSchema.Type.INT, "So very old"));
            fail("Was able to append field schema with same name");
        } catch (HCatException he) {
            assertTrue(he.getMessage().contains("Attempt to append HCatFieldSchema with already existing name: age."));
        }

        assertTrue(schema.getFieldNames().contains("age"));
        assertEquals(2, schema.getFields().size());

        // Should also not be able to add fields of different types with same name
        try {
            schema.append(new HCatFieldSchema("age", HCatFieldSchema.Type.STRING, "Maybe spelled out?"));
            fail("Was able to append field schema with same name");
        } catch (HCatException he) {
            assertTrue(he.getMessage().contains("Attempt to append HCatFieldSchema with already existing name: age."));
        }

        assertTrue(schema.getFieldNames().contains("age"));
        assertEquals(2, schema.getFields().size());
    }

    public void testCannotInstantiateSchemaWithRepeatedFieldNames() throws HCatException {
        List<HCatFieldSchema> fieldSchemaList = new ArrayList<HCatFieldSchema>();

        fieldSchemaList.add(new HCatFieldSchema("memberID", HCatFieldSchema.Type.INT, "as a number"));
        fieldSchemaList.add(new HCatFieldSchema("location", HCatFieldSchema.Type.STRING, "there's Waldo"));

        // No duplicate names.  This should be ok
        HCatSchema schema = new HCatSchema(fieldSchemaList);

        fieldSchemaList.add(new HCatFieldSchema("memberID", HCatFieldSchema.Type.STRING, "as a String"));

        // Now a duplicated field name.  Should fail
        try {
            HCatSchema schema2 = new HCatSchema(fieldSchemaList);
            fail("Able to add duplicate field name");
        } catch (IllegalArgumentException iae) {
            assertTrue(iae.getMessage().contains("Field named memberID already exists"));
        }
    }
}