// Copyright 2004, 2005 The Apache Software Foundation
//
// Licensed 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.tapestry.binding;
import static org.easymock.EasyMock.expect;
import static org.easymock.EasyMock.expectLastCall;
import org.apache.hivemind.Location;
import org.apache.tapestry.BindingException;
import org.apache.tapestry.IComponent;
import org.apache.tapestry.coerce.ValueConverter;
import org.apache.tapestry.services.ExpressionCache;
import org.apache.tapestry.services.ExpressionEvaluator;
import org.testng.annotations.Test;
/**
* Tests for {@link org.apache.tapestry.binding.ExpressionBinding}.
*
* @author Howard M. Lewis Ship
* @since 4.0
*/
@Test
public class TestExpressionBinding extends BindingTestCase
{
public void testInvariant()
{
ExpressionEvaluator ev = newMock(ExpressionEvaluator.class);
ExpressionCache ec = newMock(ExpressionCache.class);
IComponent component = newMock(IComponent.class);
Location l = fabricateLocation(1);
Object compiled = new Object();
Object expressionValue = "EXPRESSION-VALUE";
ValueConverter vc = newValueConverter();
expect(ec.getCompiledExpression("exp")).andReturn(compiled);
expect(ev.isConstant("exp")).andReturn(true);
expect(ev.readCompiled(component, compiled)).andReturn(expressionValue);
expect(component.getExtendedId()).andReturn("Foo/bar.baz");
replay();
ExpressionBinding b = new ExpressionBinding("param", l, vc, component,
"exp", ev, ec);
assertEquals(true, b.isInvariant());
// A second time, to test the 'already initialized'
// code path.
assertEquals(true, b.isInvariant());
// Get the object, which should be cached.
assertSame(expressionValue, b.getObject());
assertSame(component, b.getComponent());
assertEquals("ExpressionBinding[Foo/bar.baz exp]", b.toString());
verify();
}
public void testVariant()
{
ExpressionEvaluator ev = newMock(ExpressionEvaluator.class);
ExpressionCache ec = newMock(ExpressionCache.class);
Location l = fabricateLocation(1);
IComponent component = newComponent();
Object compiled = new Object();
Object expressionValue1 = new Object();
Object expressionValue2 = new Object();
ValueConverter vc = newValueConverter();
expect(ec.getCompiledExpression("exp")).andReturn(compiled);
expect(ev.isConstant("exp")).andReturn(false);
expect(ev.readCompiled(component, compiled)).andReturn(expressionValue1);
expect(ev.readCompiled(component, compiled)).andReturn(expressionValue2);
replay();
ExpressionBinding b = new ExpressionBinding("param", l, vc, component,
"exp", ev, ec);
assertEquals(false, b.isInvariant());
// Check that the expression is re-evaluated on
// each call to getObject().
assertSame(expressionValue1, b.getObject());
assertSame(expressionValue2, b.getObject());
verify();
}
public void testSetObject()
{
ExpressionEvaluator ev = newMock(ExpressionEvaluator.class);
ExpressionCache ec = newMock(ExpressionCache.class);
Location l = fabricateLocation(1);
IComponent component = newComponent();
Object compiled = new Object();
ValueConverter vc = newValueConverter();
expect(ec.getCompiledExpression("exp")).andReturn(compiled);
expect(ev.isConstant("exp")).andReturn(false);
Object newValue = new Object();
ev.writeCompiled(component, compiled, newValue);
replay();
ExpressionBinding b = new ExpressionBinding("param", l, vc, component,
"exp", ev, ec);
b.setObject(newValue);
verify();
}
public void testSetObjectInvariant()
{
ExpressionEvaluator ev = newMock(ExpressionEvaluator.class);
ExpressionCache ec = newMock(ExpressionCache.class);
Location l = fabricateLocation(1);
IComponent component = newComponent("Foo/bar.baz");
Object compiled = new Object();
ValueConverter vc = newValueConverter();
expect(ec.getCompiledExpression("exp")).andReturn(compiled);
expect(ev.isConstant("exp")).andReturn(true);
replay();
ExpressionBinding b = new ExpressionBinding("parameter foo", l, vc, component,
"exp", ev, ec);
try
{
b.setObject(new Object());
unreachable();
}
catch (BindingException ex)
{
assertEquals(
"Binding for parameter foo (ExpressionBinding[Foo/bar.baz exp]) may not be updated.",
ex.getMessage());
}
verify();
}
public void testSetObjectFailure()
{
ExpressionEvaluator ev = newMock(ExpressionEvaluator.class);
ExpressionCache ec = newMock(ExpressionCache.class);
Location l = fabricateLocation(1);
IComponent component = newComponent();
Object compiled = new Object();
ValueConverter vc = newValueConverter();
expect(ec.getCompiledExpression("exp")).andReturn(compiled);
expect(ev.isConstant("exp")).andReturn(false);
Object newValue = new Object();
RuntimeException innerException = new RuntimeException("Failure");
ev.writeCompiled(component, compiled, newValue);
expectLastCall().andThrow(innerException);
replay();
ExpressionBinding b = new ExpressionBinding("param", l, vc, component,
"exp", ev, ec);
try
{
b.setObject(newValue);
unreachable();
}
catch (BindingException ex)
{
assertEquals("Failure", ex.getMessage());
assertSame(innerException, ex.getRootCause());
}
verify();
}
public void testCompileExpressionFailure()
{
ExpressionEvaluator ev = newMock(ExpressionEvaluator.class);
ExpressionCache ec = newMock(ExpressionCache.class);
Location l = fabricateLocation(1);
IComponent component = newComponent();
ValueConverter vc = newValueConverter();
Throwable innerException = new RuntimeException("Failure");
expect(ec.getCompiledExpression("exp")).andThrow(innerException);
replay();
ExpressionBinding b = new ExpressionBinding("param", l, vc, component,
"exp", ev, ec);
try
{
b.isInvariant();
unreachable();
}
catch (BindingException ex)
{
assertEquals("Failure", ex.getMessage());
assertSame(innerException, ex.getRootCause());
}
verify();
}
public void testResolveExpressionFailure()
{
ExpressionEvaluator ev = newMock(ExpressionEvaluator.class);
ExpressionCache ec = newMock(ExpressionCache.class);
Location l = fabricateLocation(1);
IComponent component = newComponent();
Object compiled = new Object();
ValueConverter vc = newValueConverter();
expect(ec.getCompiledExpression("exp")).andReturn(compiled);
expect(ev.isConstant("exp")).andReturn(false);
Throwable innerException = new RuntimeException("Failure");
ev.readCompiled(component, compiled);
expectLastCall().andThrow(innerException);
replay();
ExpressionBinding b = new ExpressionBinding("param", l, vc, component,
"exp", ev, ec);
try
{
b.getObject();
unreachable();
}
catch (BindingException ex)
{
assertEquals("Failure", ex.getMessage());
assertSame(innerException, ex.getRootCause());
}
verify();
}
}