// Copyright 2006, 2008, 2009 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.tapestry5.internal.bindings;
import org.apache.tapestry5.Binding;
import org.apache.tapestry5.ComponentResources;
import org.apache.tapestry5.Field;
import org.apache.tapestry5.FieldValidator;
import org.apache.tapestry5.internal.services.StringInterner;
import org.apache.tapestry5.ioc.Location;
import org.apache.tapestry5.ioc.internal.util.TapestryException;
import org.apache.tapestry5.services.BindingFactory;
import org.apache.tapestry5.services.FieldValidatorSource;
/**
* Factory for bindings that provide a {@link org.apache.tapestry5.FieldValidator} based on a validator specification.
* This binding factory is only useable with components that implement the {@link org.apache.tapestry5.Field}
* interface.
*/
public class ValidateBindingFactory implements BindingFactory
{
private final FieldValidatorSource fieldValidatorSource;
private final StringInterner interner;
public ValidateBindingFactory(FieldValidatorSource fieldValidatorSource, StringInterner interner)
{
this.fieldValidatorSource = fieldValidatorSource;
this.interner = interner;
}
public Binding newBinding(String description, ComponentResources container,
ComponentResources component, final String expression, Location location)
{
Object fieldAsObject = component.getComponent();
if (!Field.class.isInstance(fieldAsObject))
throw new TapestryException(BindingsMessages.validateBindingForFieldsOnly(component),
location, null);
final Field field = (Field) fieldAsObject;
return new InvariantBinding(location, FieldValidator.class, interner.intern(description + ": " + expression))
{
public Object get()
{
// The expression is a validator specification, such as "required,minLength=5".
// ValidatorBindingFactory is the odd man out becasuse it needs the binding component (the
// component whose parameter is to be bound) rather than the containing component, the way
// most factories work.
return fieldValidatorSource.createValidators(field, expression);
}
};
}
}