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IValidationDelegate.java | - | - | - | - |
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// Copyright 2004, 2005 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package org.apache.tapestry.valid;
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import java.util.List;
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import org.apache.tapestry.IMarkupWriter;
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import org.apache.tapestry.IRender;
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import org.apache.tapestry.IRequestCycle;
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import org.apache.tapestry.form.IFormComponent;
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/**
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* Interface used to track validation errors in forms and
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* {@link IFormComponent}s (including {@link org.apache.tapestry.form.AbstractTextField}
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* and its subclasses).
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*
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* <p>In addition,
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* controls how fields that are in error are presented (they can be
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* marked in various ways by the delegate; the default implementation
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* adds two red asterisks to the right of the field).
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*
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* <p>The interface is designed so that a single instance can be shared
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* with many instances of {@link IFormComponent}.
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*
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* <p>Starting with release 1.0.8, this interface was extensively revised
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* (in a non-backwards compatible way) to move the tracking of errors and
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* invalid values (during a request cycle) to the delegate. It has evolved from
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* a largely stateless conduit for error messages into a very stateful tracker
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* of field state.
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*
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* <p>Starting with release 1.0.9, this interface was <em>again</em>
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* reworked, to allow tracking of errors in {@link IFormComponent form components},
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* and to allow unassociated (with any field) errors
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* to be tracked.
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*
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* <p><b>Fields vs. Form Components</b><br>
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* For most simple forms, these terms are pretty much synonymous.
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* Your form will render normally, and each form component will render
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* only once. Some of your form components will be {@link ValidField}
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* components and handle most of
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* their validation internally (with the help of {@link IValidator} objects).
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* In addition, your form listener may do additional validation and notify
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* the validation delegate of additional errors, some of which
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* are associated with a particular field, some of which are unassociated
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* with any particular field.
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*
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* <p>
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* But what happens if you use a {@link org.apache.tapestry.components.Foreach} or
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* {@link org.apache.tapestry.form.ListEdit} inside your form?
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* Some of your components will render multiple times. In this case you will have
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* multiple <em>fields</em>. Each field will have a unique field name (you can see this
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* in the generated HTML). It is this field name that the delegate keys off of, which
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* means that some fields generated by a component may have errors and some may not, it
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* all works fine (with one exception).
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*
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* <p><b>The Exception</b><br>
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* The problem is that a component doesn't know its field name until its
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* <code>render()</code> method is invoked (at which point, it allocates a unique field
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* name from the {@link org.apache.tapestry.IForm#getElementId(org.apache.tapestry.form.IFormComponent)}.
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* This is not a problem for the field or its
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* {@link IValidator}, but screws things up for the {@link FieldLabel}.
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*
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* <p>Typically, the label is rendered <em>before</em> the corresponding form component.
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* Form components leave their last assigned field name in their
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* {@link IFormComponent#getName() name property}. So if the form component is in any kind of
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* loop, the {@link FieldLabel} will key its name,
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* {@link IFormComponent#getDisplayName() display name} and error status off of
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* its last renderred value. So the moral of the story is don't use
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* {@link FieldLabel} in this situation.
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*
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*
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* @author Howard Lewis Ship
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*
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**/
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public interface IValidationDelegate |
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{ |
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/**
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* Invoked before other methods to configure the delegate for the given
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* form component. Sets the current field based on
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* the {@link IFormComponent#getName() name} of the form component
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* (which is almost always a {@link ValidField}).
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*
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* <p>The caller should invoke this with a parameter of null to record
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* unassociated global errors (errors not associated with any particular field).
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*
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* @since 1.0.8
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*
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**/
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public void setFormComponent(IFormComponent component); |
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/**
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* Returns true if the current component is in error (that is, had bad input
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* submitted by the end user).
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*
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* @since 1.0.8
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*
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**/
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public boolean isInError(); |
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/**
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* Returns the string submitted by the client as the value for
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* the current field.
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*
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* @since 1.0.8
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*
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**/
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public String getFieldInputValue();
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/**
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* Returns a {@link List} of {@link IFieldTracking}, in default order
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* (the order in which fields are renderred). A caller should
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* not change the values (the List is immutable).
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* May return null if no fields are in error.
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*
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* @since 1.0.8
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**/
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public List getFieldTracking();
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/**
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* Resets any tracking information for the current field. This will
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* clear the field's inError flag, and set its error message and invalid input value
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* to null.
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*
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* @since 1.0.8
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*
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**/
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public void reset(); |
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/**
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* Clears all tracking information.
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*
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* @since 1.0.10
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*
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**/
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public void clear(); |
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/**
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* Records the user's input for the current form component. Input should
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* be recorded even if there isn't an explicit error, since later form-wide
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* validations may discover an error in the field.
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*
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* @since 3.0
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*
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**/
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public void recordFieldInputValue(String input); |
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/**
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* The error notification method, invoked during the rewind phase
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* (that is, while HTTP parameters are being extracted from the request
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* and assigned to various object properties).
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*
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* <p>Typically, the delegate simply invokes
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* {@link #record(String, ValidationConstraint)} or
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* {@link #record(IRender, ValidationConstraint)}, but special
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* delegates may override this behavior to provide (in some cases)
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* different error messages or more complicated error renderers.
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*
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**/
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public void record(ValidatorException ex); |
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/**
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* Records an error in the current field, or an unassociated error
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* if there is no current field.
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*
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* @param message message to display (@see RenderString}
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* @param constraint the constraint that was violated, or null if not known
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*
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* @since 1.0.9
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**/
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public void record(String message, ValidationConstraint constraint); |
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/**
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* Records an error in the current component, or an unassociated error.
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* The maximum flexibility recorder.
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*
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* @param errorRenderer object that will render the error message (@see RenderString}
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* @param constraint the constraint that was violated, or null if not known
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*
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**/
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public void record(IRender errorRenderer, ValidationConstraint constraint); |
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/**
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* Invoked before the field is rendered. If the field is in error,
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* the delegate may decorate the field in some way (to highlight its
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* error state).
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*
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**/
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public void writePrefix( |
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IMarkupWriter writer, |
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IRequestCycle cycle, |
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IFormComponent component, |
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IValidator validator); |
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/**
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* Invoked just before the <input> element is closed.
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* The delegate can write additional attributes. This is often used
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* to set the CSS class of the field so that it can be displayed
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* differently, if in error (or required).
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*
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* @since 1.0.5
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**/
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public void writeAttributes( |
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IMarkupWriter writer, |
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IRequestCycle cycle, |
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IFormComponent component, |
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IValidator validator); |
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/**
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* Invoked after the form component is rendered, so that the
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* delegate may decorate the form component (if it is in error).
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*
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**/
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public void writeSuffix( |
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IMarkupWriter writer, |
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IRequestCycle cycle, |
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IFormComponent component, |
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IValidator validator); |
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/**
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* Invoked by a {@link FieldLabel} just before writing the name
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* of the form component.
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*
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**/
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public void writeLabelPrefix( |
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IFormComponent component, |
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IMarkupWriter writer, |
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IRequestCycle cycle); |
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/**
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* Invoked by a {@link FieldLabel} just after writing the name
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* of the form component.
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*
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**/
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public void writeLabelSuffix( |
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IFormComponent component, |
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IMarkupWriter writer, |
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IRequestCycle cycle); |
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/**
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* Returns true if any form component has errors.
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*
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**/
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public boolean getHasErrors(); |
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} |
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