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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
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 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.cayenne.exp;

import static org.junit.Assert.assertEquals;

import org.apache.cayenne.exp.parser.ASTLike;
import org.apache.cayenne.exp.parser.ASTObjPath;
import org.apache.cayenne.exp.parser.PatternMatchNode;
import org.junit.Test;

public class LikeExpressionHelperTest {

	@Test
	public void testEscape_NoEscapeChars() {

		PatternMatchNode node = new ASTLike(new ASTObjPath("x"), "abc");
		LikeExpressionHelper.escape(node);
		assertEquals("abc", node.getOperand(1));
		assertEquals(0, node.getEscapeChar());
	}
	
	@Test
	public void testEscape_OneChar() {

		PatternMatchNode node = new ASTLike(new ASTObjPath("x"), "ab_c");
		LikeExpressionHelper.escape(node);
		assertEquals("ab!_c", node.getOperand(1));
		assertEquals('!', node.getEscapeChar());
	}
	
	@Test
	public void testEscape_TwoChars() {

		PatternMatchNode node = new ASTLike(new ASTObjPath("x"), "ab_c_");
		LikeExpressionHelper.escape(node);
		assertEquals("ab!_c!_", node.getOperand(1));
		assertEquals('!', node.getEscapeChar());
	}
	
	@Test
	public void testEscape_TwoChars_Mix() {

		PatternMatchNode node = new ASTLike(new ASTObjPath("x"), "ab%c_");
		LikeExpressionHelper.escape(node);
		assertEquals("ab!%c!_", node.getOperand(1));
		assertEquals('!', node.getEscapeChar());
	}
	
	@Test
	public void testEscape_AltEscapeChar1() {

		PatternMatchNode node = new ASTLike(new ASTObjPath("x"), "a!%c");
		LikeExpressionHelper.escape(node);
		assertEquals("a!#%c", node.getOperand(1));
		assertEquals('#', node.getEscapeChar());
	}
	
	@Test
	public void testEscape_AltEscapeChar2() {

		PatternMatchNode node = new ASTLike(new ASTObjPath("x"), "a!%c#_");
		LikeExpressionHelper.escape(node);
		assertEquals("a!$%c#$_", node.getOperand(1));
		assertEquals('$', node.getEscapeChar());
	}
}