StringValueArrayTest.java

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 * 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,
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 * See the License for the specific language governing permissions and
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 */

package org.apache.flink.graph.types.valuearray;

import org.apache.flink.types.StringValue;
import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

public class StringValueArrayTest {

	@Test
	public void testBoundedArray() {
		// one byte for length and one byte for character
		int count = StringValueArray.DEFAULT_CAPACITY_IN_BYTES / 2;

		ValueArray<StringValue> sva = new StringValueArray(StringValueArray.DEFAULT_CAPACITY_IN_BYTES);

		// fill the array
		for (int i = 0 ; i < count ; i++) {
			assertFalse(sva.isFull());
			assertEquals(i, sva.size());

			assertTrue(sva.add(new StringValue(Character.toString((char)(i & 0x7F)))));

			assertEquals(i + 1, sva.size());
		}

		// array is now full
		assertTrue(sva.isFull());
		assertEquals(count, sva.size());

		// verify the array values
		int idx = 0;
		for (StringValue sv : sva) {
			assertEquals((idx++) & 0x7F, sv.getValue().charAt(0));
		}

		// add element past end of array
		assertFalse(sva.add(new StringValue(String.valueOf((char)count))));
		assertFalse(sva.addAll(sva));

		// test copy
		assertEquals(sva, sva.copy());

		// test copyTo
		StringValueArray sva_to = new StringValueArray();
		sva.copyTo(sva_to);
		assertEquals(sva, sva_to);

		// test clear
		sva.clear();
		assertEquals(0, sva.size());
	}

	@Test
	public void testBoundedArrayWithVariableLengthCharacters() {
		// characters alternatingly take 1 and 2 bytes (plus one byte for length)
		int count = 1280;

		ValueArray<StringValue> sva = new StringValueArray(3200);

		// fill the array
		for (int i = 0 ; i < count ; i++) {
			assertFalse(sva.isFull());
			assertEquals(i, sva.size());

			assertTrue(sva.add(new StringValue(Character.toString((char)(i & 0xFF)))));

			assertEquals(i + 1, sva.size());
		}

		// array is now full
		assertTrue(sva.isFull());
		assertEquals(count, sva.size());

		// verify the array values
		int idx = 0;
		for (StringValue sv : sva) {
			assertEquals((idx++) & 0xFF, sv.getValue().charAt(0));
		}

		// add element past end of array
		assertFalse(sva.add(new StringValue(String.valueOf((char)count))));
		assertFalse(sva.addAll(sva));

		// test copy
		assertEquals(sva, sva.copy());

		// test copyTo
		StringValueArray sva_to = new StringValueArray();
		sva.copyTo(sva_to);
		assertEquals(sva, sva_to);

		// test clear
		sva.clear();
		assertEquals(0, sva.size());
	}

	@Test
	public void testUnboundedArray() {
		int count = 4096;

		ValueArray<StringValue> sva = new StringValueArray();

		// add several elements
		for (int i = 0 ; i < count ; i++) {
			assertFalse(sva.isFull());
			assertEquals(i, sva.size());

			assertTrue(sva.add(new StringValue(String.valueOf((char)i))));

			assertEquals(i + 1, sva.size());
		}

		// array never fills
		assertFalse(sva.isFull());
		assertEquals(count, sva.size());

		// verify the array values
		int idx = 0;
		for (StringValue sv : sva) {
			assertEquals(idx++, sv.getValue().charAt(0));
		}

		// add element past end of array
		assertTrue(sva.add(new StringValue(String.valueOf((char)count))));
		assertTrue(sva.addAll(sva));

		// test copy
		assertEquals(sva, sva.copy());

		// test copyTo
		StringValueArray sva_to = new StringValueArray();
		sva.copyTo(sva_to);
		assertEquals(sva, sva_to);

		// test mark/reset
		int size = sva.size();
		sva.mark();
		assertTrue(sva.add(new StringValue()));
		assertEquals(size + 1, sva.size());
		sva.reset();
		assertEquals(size, sva.size());

		// test clear
		sva.clear();
		assertEquals(0, sva.size());
	}
}