tapestry/tapestry-framework/src/test/org/apache/tapestry/enhance/TestHiveMindExpressionCompiler.java

package org.apache.tapestry.enhance;

import ognl.Node;
import ognl.Ognl;
import ognl.OgnlContext;
import org.apache.tapestry.TestBase;
import org.apache.tapestry.services.impl.HiveMindExpressionCompiler;
import org.testng.annotations.Test;

/**
 * Tests functionality of {@link org.apache.tapestry.services.impl.HiveMindExpressionCompiler}.
 */
@Test
public class TestHiveMindExpressionCompiler extends TestBase {

    ClassFactoryImpl _classFactory = new ClassFactoryImpl();
    HiveMindExpressionCompiler _compiler = new HiveMindExpressionCompiler(_classFactory);

    public void test_Duplicate_Class_Compiler()
    throws Exception
    {
        OgnlContext context = (OgnlContext) Ognl.createDefaultContext(null);
        BasicObject root = new BasicObject();
        String expr = "name";
        Node expression = (Node) Ognl.parseExpression(expr);

        _compiler.compileExpression(context, expression, root);
        assert expression.getAccessor() != null;
        assertEquals(expression.getAccessor().get(context, root), root.getName());

        Node expression2 = (Node) Ognl.parseExpression(expr);
        
        _compiler.compileExpression(context, expression2, root);
        assert expression2.getAccessor() != null;
        assertEquals(expression2.getAccessor().get(context, root), root.getName());

        assertNotSame(expression2.getAccessor().getClass().getName(), expression.getAccessor().getClass().getName());
    }

    public void test_Divide_By_Zero()
    throws Exception
    {
        OgnlContext context = (OgnlContext) Ognl.createDefaultContext(null);
        String expr = "true ? 1 : 1/0";

        Node expression = (Node) Ognl.parseExpression(expr);
        _compiler.compileExpression(context, expression, expr);
        
        assertEquals(expression.getAccessor().get(context, null), Integer.valueOf(1));
    }

    public void test_ClassFab_Generation_Count_With_Uncompilable_Expression()
            throws Exception
    {
        OgnlContext context = (OgnlContext) Ognl.createDefaultContext(null);
        BasicObject root = new BasicObject();

        String exprStr = "user != null && user.name != null ? user.name : name";
        Node expression = (Node) Ognl.parseExpression(exprStr);

        int prevCount = _classFactory._classCounter;

        _compiler.compileExpression(context, expression, root);
        assert expression.getAccessor() == null;

        assertEquals(_classFactory._classCounter, prevCount);

        root.setUser(new User());

        _compiler.compileExpression(context, expression, root);
        assert expression.getAccessor() != null;

        assertEquals(_classFactory._classCounter, prevCount + 1);
    }

    public void test_ClassFab_Generation_Count_With_Uncompilable_Expression2()
            throws Exception
    {
        OgnlContext context = (OgnlContext) Ognl.createDefaultContext(null);
        BasicObject root = new BasicObject();

        String exprStr = "user ? user.name : name";
        Node expression = (Node) Ognl.parseExpression(exprStr);

        int prevCount = _classFactory._classCounter;

        _compiler.compileExpression(context, expression, root);
        assert expression.getAccessor() == null;

        assertEquals(_classFactory._classCounter, prevCount);

        root.setUser(new User());

        _compiler.compileExpression(context, expression, root);
        assert expression.getAccessor() != null;

        assertEquals(_classFactory._classCounter, prevCount + 1);
    }
}