phoenix-core/src/test/java/org/apache/phoenix/util/StringUtilTest.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.phoenix.util;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;

import org.apache.phoenix.schema.SortOrder;
import org.junit.Test;

public class StringUtilTest {

    private void testLpad(String inputString, int length, String fillString, String expectedOutput) throws Exception {
        byte[] input = inputString.getBytes();
        byte[] fill = fillString.getBytes();
        byte[] output = StringUtil.lpad(input, 0, input.length, fill, 0, fill.length, false, length);
        assertArrayEquals("Incorrect output of lpad", expectedOutput.getBytes(), output);
    }

    @Test
    public void testLpadFillLengthLessThanPadLength() throws Exception {
        testLpad("ABCD", 8, "12", "1212ABCD");
    }

    @Test
    public void testLpadFillLengthEqualPadLength() throws Exception {
        testLpad("ABCD", 8, "1234", "1234ABCD");
    }
    
    @Test
    public void testLpadFillLengthGreaterThanPadLength() throws Exception {
        testLpad("ABCD", 8, "12345", "1234ABCD");
    }

    @Test
    public void testLpadZeroPadding() throws Exception {
        testLpad("ABCD", 4, "1234", "ABCD");
    }

    @Test
    public void testCalculateUTF8Offset() throws Exception {
        String tmp, padding = "padding", data = "零一二三四五六七八九", trailing = "trailing";
        byte[] bytes = (padding + data + trailing).getBytes();
        int ret, offset = padding.getBytes().length, length = data.getBytes().length;

        tmp = padding;
        for (int i = 0; i < data.length(); ++i) {
            ret = StringUtil.calculateUTF8Offset(bytes, offset, length, SortOrder.ASC, i);
            assertEquals(tmp.getBytes().length, ret);
            tmp = tmp + data.charAt(i);
        }
        for (int i = data.length(); i < data.length() + 10; ++i) {
            ret = StringUtil.calculateUTF8Offset(bytes, offset, length, SortOrder.ASC, i);
            assertEquals(-1, ret);
        }

        for (int i = -data.length() - 10; i < -data.length(); ++i) {
            ret = StringUtil.calculateUTF8Offset(bytes, offset, length, SortOrder.ASC, i);
            assertEquals(-1, ret);
        }
        tmp = padding;
        for (int i = -data.length(); i <= -1; ++i) {
            ret = StringUtil.calculateUTF8Offset(bytes, offset, length, SortOrder.ASC, i);
            assertEquals("i=" + i, tmp.getBytes().length, ret);
            tmp = tmp + data.charAt(i + data.length());
        }
    }
}