/*
* Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.test.unit;
import java.text.Collator;
import org.h2.expression.CompareLike;
import org.h2.test.TestBase;
import org.h2.value.CompareMode;
/**
* Tests LIKE pattern matching.
*/
public class TestPattern extends TestBase {
/**
* Run just this test.
*
* @param a ignored
*/
public static void main(String... a) throws Exception {
TestBase.createCaller().init().test();
}
@Override
public void test() {
testCompareModeReuse();
testPattern();
}
private void testCompareModeReuse() {
CompareMode mode1, mode2;
mode1 = CompareMode.getInstance(null, 0);
mode2 = CompareMode.getInstance(null, 0);
assertTrue(mode1 == mode2);
mode1 = CompareMode.getInstance("DE", Collator.SECONDARY);
assertFalse(mode1 == mode2);
mode2 = CompareMode.getInstance("DE", Collator.SECONDARY);
assertTrue(mode1 == mode2);
}
private void testPattern() {
CompareMode mode = CompareMode.getInstance(null, 0);
CompareLike comp = new CompareLike(mode, "\\", null, null, null, false);
test(comp, "B", "%_");
test(comp, "A", "A%");
test(comp, "A", "A%%");
test(comp, "A_A", "%\\_%");
for (int i = 0; i < 10000; i++) {
String pattern = getRandomPattern();
String value = getRandomValue();
test(comp, value, pattern);
}
}
private void test(CompareLike comp, String value, String pattern) {
String regexp = initPatternRegexp(pattern, '\\');
boolean resultRegexp = value.matches(regexp);
boolean result = comp.test(pattern, value, '\\');
if (result != resultRegexp) {
fail("Error: >" + value + "< LIKE >" + pattern + "< result=" +
result + " resultReg=" + resultRegexp);
}
}
private static String getRandomValue() {
StringBuilder buff = new StringBuilder();
int len = (int) (Math.random() * 10);
String s = "AB_%\\";
for (int i = 0; i < len; i++) {
buff.append(s.charAt((int) (Math.random() * s.length())));
}
return buff.toString();
}
private static String getRandomPattern() {
StringBuilder buff = new StringBuilder();
int len = (int) (Math.random() * 4);
String s = "A%_\\";
for (int i = 0; i < len; i++) {
char c = s.charAt((int) (Math.random() * s.length()));
if ((c == '_' || c == '%') && Math.random() > 0.5) {
buff.append('\\');
} else if (c == '\\') {
buff.append(c);
}
buff.append(c);
}
return buff.toString();
}
private String initPatternRegexp(String pattern, char escape) {
int len = pattern.length();
StringBuilder buff = new StringBuilder();
for (int i = 0; i < len; i++) {
char c = pattern.charAt(i);
if (escape == c) {
if (i >= len) {
fail("escape can't be last char");
}
c = pattern.charAt(++i);
buff.append('\\');
buff.append(c);
} else if (c == '%') {
buff.append(".*");
} else if (c == '_') {
buff.append('.');
} else if (c == '\\') {
buff.append("\\\\");
} else {
buff.append(c);
}
// TODO regexp: there are other chars that need escaping
}
String regexp = buff.toString();
// System.out.println("regexp = " + regexp);
return regexp;
}
}