/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file 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 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.wicket.markup.html.form;
import java.io.Serializable;
import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import org.apache.wicket.Application;
import org.apache.wicket.Component;
import org.apache.wicket.IConverterLocator;
import org.apache.wicket.Localizer;
import org.apache.wicket.WicketRuntimeException;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.IPropertyReflectionAwareModel;
import org.apache.wicket.model.Model;
import org.apache.wicket.util.convert.ConversionException;
import org.apache.wicket.util.convert.IConverter;
import org.apache.wicket.util.lang.Args;
import org.apache.wicket.core.util.lang.WicketObjects;
import org.apache.wicket.util.string.StringList;
import org.apache.wicket.util.string.StringValue;
import org.apache.wicket.util.string.Strings;
import org.apache.wicket.util.string.interpolator.MapVariableInterpolator;
import org.apache.wicket.util.visit.IVisit;
import org.apache.wicket.util.visit.IVisitFilter;
import org.apache.wicket.util.visit.IVisitor;
import org.apache.wicket.util.visit.Visits;
import org.apache.wicket.validation.IErrorMessageSource;
import org.apache.wicket.validation.INullAcceptingValidator;
import org.apache.wicket.validation.IValidatable;
import org.apache.wicket.validation.IValidationError;
import org.apache.wicket.validation.IValidator;
import org.apache.wicket.validation.ValidationError;
import org.apache.wicket.validation.ValidatorAdapter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An HTML form component knows how to validate itself. Validators that implement IValidator can be
* added to the component. They will be evaluated in the order they were added and the first
* Validator that returns an error message determines the error message returned by the component.
* <p>
* FormComponents are not versioned by default. If you need versioning for your FormComponents, you
* will need to call Form.setVersioned(true), which will set versioning on for the form and all form
* component children.
* <p>
* If this component is required and that fails, the error key that is used is the "Required"; if
* the type conversion fails, it will use the key "IConverter" if the conversion failed in a
* converter, or "ConversionError" if type was explicitly specified via {@link #setType(Class)} or a
* {@link IPropertyReflectionAwareModel} was used. Notice that both "IConverter" and
* "ConversionError" have a more specific variant of "key.classname" where classname is the type
* that we failed to convert to. Classname is not full qualified, so only the actual name of the
* class is used.
*
* Property expressions that can be used in error messages are:
* <ul>
* <li>${input}: the input the user did give</li>
* <li>${name}: the name of the component that failed</li>
* <li>${label}: the label of the component</li>
* </ul>
*
* @author Jonathan Locke
* @author Eelco Hillenius
* @author Johan Compagner
* @author Igor Vaynberg (ivaynberg)
*
* @param <T>
* The model object type
*
*/
public abstract class FormComponent<T> extends LabeledWebMarkupContainer
implements
IFormVisitorParticipant,
IFormModelUpdateListener
{
private static final Logger logger = LoggerFactory.getLogger(FormComponent.class);
/**
* {@link IErrorMessageSource} used for error messages against this form components.
*
* @author ivaynberg
*/
private class MessageSource implements IErrorMessageSource
{
private final Set<String> triedKeys = new LinkedHashSet<String>();
/**
* @see org.apache.wicket.validation.IErrorMessageSource#getMessage(java.lang.String)
*/
@Override
public String getMessage(String key)
{
final FormComponent<T> formComponent = FormComponent.this;
// Use the following log4j config for detailed logging on the property resolution
// process
// log4j.logger.org.apache.wicket.resource.loader=DEBUG
// log4j.logger.org.apache.wicket.Localizer=DEBUG
final Localizer localizer = formComponent.getLocalizer();
// retrieve prefix that will be used to construct message keys
String prefix = formComponent.getValidatorKeyPrefix();
String message = null;
// first try the full form of key [form-component-id].[key]
String resource = getId() + "." + prefix(prefix, key);
message = getString(localizer, resource, formComponent);
// if not found, try a more general form (without prefix)
// [form-component-id].[prefix].[key]
if (Strings.isEmpty(message) && Strings.isEmpty(prefix))
{
resource = getId() + "." + key;
message = getString(localizer, resource, formComponent);
}
// If not found try a more general form [prefix].[key]
if (Strings.isEmpty(message))
{
resource = prefix(prefix, key);
message = getString(localizer, resource, formComponent);
}
// If not found try the most general form [key]
if (Strings.isEmpty(message))
{
// Try a variation of the resource key
message = getString(localizer, key, formComponent);
}
// convert empty string to null in case our default value of "" was
// returned from localizer
if (Strings.isEmpty(message))
{
message = null;
}
return message;
}
private String prefix(String prefix, String key)
{
if (!Strings.isEmpty(prefix))
{
return prefix + "." + key;
}
else
{
return key;
}
}
/**
*
* @param localizer
* @param key
* @param component
* @return string
*/
private String getString(Localizer localizer, String key, Component component)
{
triedKeys.add(key);
// Note: It is important that the default value of "" is
// provided to getString() not to throw a MissingResourceException or to
// return a default string like "[Warning: String ..."
return localizer.getString(key, component, "");
}
/**
* @see org.apache.wicket.validation.IErrorMessageSource#substitute(java.lang.String,
* java.util.Map)
*/
@Override
public String substitute(String string, Map<String, Object> vars)
throws IllegalStateException
{
return new MapVariableInterpolator(string, addDefaultVars(vars), Application.get()
.getResourceSettings()
.getThrowExceptionOnMissingResource()).toString();
}
/**
* Creates a new params map that additionally contains the default input, name, label
* parameters
*
* @param params
* original params map
* @return new params map
*/
private Map<String, Object> addDefaultVars(Map<String, Object> params)
{
// create and fill the new params map
final HashMap<String, Object> fullParams;
if (params == null)
{
fullParams = new HashMap<String, Object>(6);
}
else
{
fullParams = new HashMap<String, Object>(params.size() + 6);
fullParams.putAll(params);
}
// add the input param if not already present
if (!fullParams.containsKey("input"))
{
fullParams.put("input", getInput());
}
// add the name param if not already present
if (!fullParams.containsKey("name"))
{
fullParams.put("name", getId());
}
// add the label param if not already present
if (!fullParams.containsKey("label"))
{
fullParams.put("label", getLabel());
}
return fullParams;
}
/**
* @return value of label param for this form component
*/
private String getLabel()
{
final FormComponent<T> fc = FormComponent.this;
String label = null;
// first try the label model ...
if (fc.getLabel() != null)
{
label = fc.getLabel().getObject();
}
// ... then try a resource of format [form-component-id] with
// default of '[form-component-id]'
if (label == null)
{
label = fc.getDefaultLabel();
}
return label;
}
}
/**
* Adapter that makes this component appear as {@link IValidatable}
*
* @author ivaynberg
*/
private class ValidatableAdapter implements IValidatable<T>
{
/**
* @see org.apache.wicket.validation.IValidatable#error(org.apache.wicket.validation.IValidationError)
*/
@Override
public void error(IValidationError error)
{
FormComponent.this.error(error);
}
/**
* @see org.apache.wicket.validation.IValidatable#getValue()
*/
@Override
public T getValue()
{
return getConvertedInput();
}
/**
* @see org.apache.wicket.validation.IValidatable#isValid()
*/
@Override
public boolean isValid()
{
return FormComponent.this.isValid();
}
@Override
public IModel<T> getModel()
{
return FormComponent.this.getModel();
}
}
/**
* The value separator
*/
public static final String VALUE_SEPARATOR = ";";
private static final String[] EMPTY_STRING_ARRAY = new String[] { "" };
/** Whether or not this component's value is required (non-empty) */
private static final short FLAG_REQUIRED = FLAG_RESERVED3;
private static final String NO_RAW_INPUT = "[-NO-RAW-INPUT-]";
private static final long serialVersionUID = 1L;
/**
* Make empty strings null values boolean. Used by AbstractTextComponent subclass.
*/
protected static final short FLAG_CONVERT_EMPTY_INPUT_STRING_TO_NULL = FLAG_RESERVED1;
/**
* Visits any form components inside component if it is a container, or component itself if it
* is itself a form component
*
* @param <R>
* the type of the visitor's result
*
* @param component
* starting point of the traversal
*
* @param visitor
* The visitor to call
* @return the visitor's result
*/
public static final <R> R visitFormComponentsPostOrder(Component component,
final IVisitor<? extends FormComponent<?>, R> visitor)
{
return Visits.visitPostOrder(component, visitor, new IVisitFilter()
{
@Override
public boolean visitChildren(Object object)
{
if (object instanceof IFormVisitorParticipant)
{
return ((IFormVisitorParticipant)object).processChildren();
}
return true;
}
@Override
public boolean visitObject(Object object)
{
return (object instanceof FormComponent<?>);
}
});
}
/**
* Visits any form components inside component if it is a container, or component itself if it
* is itself a form component
*
* @param <R>
* the type of the visitor's result
* @param component
* starting point of the traversal
*
* @param visitor
* The visitor to call
* @return the visitor's result
*/
public static final <R> R visitComponentsPostOrder(Component component,
final org.apache.wicket.util.visit.IVisitor<Component, R> visitor)
{
Args.notNull(visitor, "visitor");
return Visits.visitPostOrder(component, visitor, new IVisitFilter()
{
@Override
public boolean visitObject(Object object)
{
return true;
}
@Override
public boolean visitChildren(Object object)
{
if (object instanceof IFormVisitorParticipant)
{
return ((IFormVisitorParticipant)object).processChildren();
}
return true;
}
});
}
private transient T convertedInput;
/**
* Raw Input entered by the user or NO_RAW_INPUT if nothing is filled in.
*/
private String rawInput = NO_RAW_INPUT;
/**
* Type that the raw input string will be converted to
*/
private String typeName;
/**
* @see org.apache.wicket.Component#Component(String)
*/
public FormComponent(final String id)
{
this(id, null);
}
/**
* @param id
* @param model
* @see org.apache.wicket.Component#Component(String, IModel)
*/
public FormComponent(final String id, IModel<T> model)
{
super(id, model);
// the form decides whether form components are versioned or not
// see Form.setVersioned
setVersioned(false);
}
/**
* Gets the string the component would use as a label when one was requested but no label model
* was set via {@link #getLabel()}. The value of this string is usually set in a property file;
* if the value is not set the default value equivalent to component id will be returned.
*
* @return localized label
*/
public final String getDefaultLabel()
{
return getDefaultLabel(getId());
}
/**
* Gets the string the component would use as a label when one was requested but no label model
* was set via {@link #getLabel()}. The value of this string is usually set in a property file;
* if the value is not set the {@code defaultValue} will be returned.
*
* @param defaultValue
*
* @return localized label
*/
public final String getDefaultLabel(String defaultValue)
{
return getLocalizer().getString(getId(), getParent(), defaultValue);
}
/**
* Adds a validator to this form component
*
* @param validator
* validator to be added
* @return <code>this</code> for chaining
* @throws IllegalArgumentException
* if validator is null
* @see IValidator
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public final FormComponent<T> add(final IValidator<? super T> validator)
{
Args.notNull(validator, "validator");
if (validator instanceof Behavior)
{
add((Behavior)validator);
}
else
{
add((Behavior)new ValidatorAdapter(validator));
}
return this;
}
/**
* Removes a validator from the form component.
*
* @param validator
* validator
* @throws IllegalArgumentException
* if validator is null or not found
* @see IValidator
* @see #add(IValidator)
* @return form component for chaining
*/
public final FormComponent<T> remove(final IValidator<? super T> validator)
{
Args.notNull(validator, "validator");
Behavior match = null;
for (Behavior behavior : getBehaviors())
{
if (behavior.equals(validator))
{
match = behavior;
break;
}
else if (behavior instanceof ValidatorAdapter)
{
if (((ValidatorAdapter<?>)behavior).getValidator().equals(validator))
{
match = behavior;
break;
}
}
}
if (match != null)
{
remove(match);
}
else
{
throw new IllegalStateException(
"Tried to remove validator that was not previously added. "
+ "Make sure your validator's equals() implementation is sufficient");
}
return this;
}
/**
* Adds a validator to this form component.
*
* @param validators
* The validator(s) to be added
* @return This
* @throws IllegalArgumentException
* if validator is null
* @see IValidator
*/
public final FormComponent<T> add(final IValidator<? super T>... validators)
{
Args.notNull(validators, "validators");
for (IValidator<? super T> validator : validators)
{
add(validator);
}
// return this for chaining
return this;
}
/**
* Checks if the form component's 'required' requirement is met by first checking
* {@link #isRequired()} to see if it has to check for requirement. If that is true then by
* default it checks if the input is null or an empty String
* {@link Strings#isEmpty(CharSequence)}
* <p>
* Subclasses that overwrite this method should also call {@link #isRequired()} first.
* </p>
*
* @return true if the 'required' requirement is met, false otherwise
*
* @see Strings#isEmpty(CharSequence)
* @see #isInputNullable()
*/
public boolean checkRequired()
{
if (isRequired())
{
final String input = getInput();
// when null, check whether this is natural for that component, or
// whether - as is the case with text fields - this can only happen
// when the component was disabled
if (input == null && !isInputNullable() && !isEnabledInHierarchy())
{
// this value must have come from a disabled field
// do not perform validation
return true;
}
// peform validation by looking whether the value is null or empty
return !Strings.isEmpty(input);
}
return true;
}
/**
* Clears the user input.
*/
public final void clearInput()
{
rawInput = NO_RAW_INPUT;
}
/**
* Reports a validation error against this form component.
*
* The actual error is reported by creating a {@link ValidationErrorFeedback} object that holds
* both the validation error and the generated error message - so a custom feedback panel can
* have access to both.
*
* @param error
* validation error
*/
public void error(IValidationError error)
{
Args.notNull(error, "error");
MessageSource source = new MessageSource();
Serializable message = error.getErrorMessage(source);
if (message == null)
{
StringBuilder buffer = new StringBuilder();
buffer.append("Could not locate error message for component: ");
buffer.append(getClass().getSimpleName());
buffer.append("@");
buffer.append(getPageRelativePath());
buffer.append(" and error: ");
buffer.append(error.toString());
buffer.append(". Tried keys: ");
Iterator<String> keys = source.triedKeys.iterator();
while (keys.hasNext())
{
buffer.append(keys.next());
if (keys.hasNext())
{
buffer.append(", ");
}
}
buffer.append(".");
message = buffer.toString();
logger.warn(message.toString());
}
error(message);
}
/**
* Gets the converted input. The converted input is set earlier though the implementation of
* {@link #convertInput()}.
*
* {@link FormComponentPanel} often access this method when constructing their converted input
* value which is often the combination of converted values of the embedded FormComponents
*
* To access the model object resulted by the full form processing, use
* {@link #getModelObject()} instead, that is an generified version of
* {@link #getDefaultModelObject()}
*
* @return value of input possibly converted into an appropriate type
*/
public final T getConvertedInput()
{
return convertedInput;
}
/**
* Sets the converted input. This method is typically not called by clients, unless they
* override {@link #convertInput()}, in which case they should call this method to update the
* input for this component instance.
*
* @param convertedInput
* the converted input
*/
public final void setConvertedInput(T convertedInput)
{
this.convertedInput = convertedInput;
}
/**
* @return The parent form for this form component
*/
public Form<?> getForm()
{
Form<?> form = Form.findForm(this);
if (form == null)
{
throw new WicketRuntimeException("Could not find Form parent for " + this);
}
return form;
}
/**
* Gets the request parameter for this component as a string.
*
* @return The value in the request for this component
*/
public String getInput()
{
String[] input = getInputAsArray();
if (input == null || input.length == 0)
{
return null;
}
else
{
return trim(input[0]);
}
}
/**
* Gets the request parameters for this component as strings.
*
* @return The values in the request for this component
*/
public String[] getInputAsArray()
{
List<StringValue> list = getRequest().getRequestParameters().getParameterValues(
getInputName());
String[] values = null;
if (list != null)
{
values = new String[list.size()];
for (int i = 0; i < list.size(); ++i)
{
values[i] = list.get(i).toString();
}
}
if (!isInputNullable())
{
if (values != null && values.length == 1 && values[0] == null)
{
// we the key got passed in (otherwise values would be null),
// but the value was set to null.
// As the servlet spec isn't clear on what to do with 'empty'
// request values - most return an empty string, but some null -
// we have to workaround here and deliberately set to an empty
// string if the the component is not nullable (text components)
return EMPTY_STRING_ARRAY;
}
}
return values;
}
/**
* Gets the string to be used for the <tt>name</tt> attribute of the form element. Generated
* using the path from the form to the component, excluding the form itself. Override it if you
* want even a smaller name. E.g. if you know for sure that the id is unique within a form.
*
* @return The string to use as the form element's name attribute
*/
public String getInputName()
{
String inputName = Form.getRootFormRelativeId(this);
Form<?> form = findParent(Form.class);
if (form != null)
{
return form.getInputNamePrefix() + inputName;
}
else
{
return inputName;
}
}
/**
* Use hasRawInput() to check if this component has raw input because null can mean 2 things: It
* doesn't have rawinput or the rawinput is really null.
*
* @return The raw form input that is stored for this formcomponent
*/
public final String getRawInput()
{
return NO_RAW_INPUT.equals(rawInput) ? null : rawInput;
}
/**
* @return the type to use when updating the model for this form component
*/
@SuppressWarnings("unchecked")
public final Class<T> getType()
{
return typeName == null ? null : (Class<T>)WicketObjects.resolveClass(typeName);
}
/**
* @see Form#getValidatorKeyPrefix()
* @return prefix used when constructing validator key messages
*/
public String getValidatorKeyPrefix()
{
Form<?> form = findParent(Form.class);
if (form != null)
{
return getForm().getValidatorKeyPrefix();
}
return null;
}
/**
* Gets an unmodifiable list of validators for this FormComponent.
*
* @return List of validators
*/
@SuppressWarnings("unchecked")
public final List<IValidator<? super T>> getValidators()
{
final List<IValidator<? super T>> list = new ArrayList<IValidator<? super T>>();
for (Behavior behavior : getBehaviors())
{
if (behavior instanceof IValidator)
{
list.add((IValidator<? super T>)behavior);
}
}
return Collections.unmodifiableList(list);
}
/**
* Gets current value for a form component, which can be either input data entered by the user,
* or the component's model object if no input was provided.
*
* @return The value
*/
public final String getValue()
{
if (NO_RAW_INPUT.equals(rawInput))
{
return getModelValue();
}
else
{
if (getEscapeModelStrings() && rawInput != null)
{
return Strings.escapeMarkup(rawInput).toString();
}
return rawInput;
}
}
/**
* Returns whether this component has raw input. Raw input is unconverted input straight from
* the client.
*
* @return boolean whether this component has raw input.
*/
public final boolean hasRawInput()
{
return !NO_RAW_INPUT.equals(rawInput);
}
/**
* Used by Form to tell the FormComponent that a new user input is available
*/
public final void inputChanged()
{
if (isVisibleInHierarchy() && isEnabledInHierarchy())
{
// Get input as String array
final String[] input = getInputAsArray();
// If there is any input
if (input != null && input.length > 0 && input[0] != null)
{
// join the values together with ";", for example, "id1;id2;id3"
rawInput = StringList.valueOf(input).join(VALUE_SEPARATOR);
}
else if (isInputNullable())
{
// no input
rawInput = null;
}
else
{
rawInput = NO_RAW_INPUT;
}
}
}
/**
* Indicate that validation of this form component failed.
*/
public final void invalid()
{
onInvalid();
}
/**
* Gets whether this component's input can be null. By default, components that do not get input
* will have null values passed in for input. However, component TextField is an example
* (possibly the only one) that never gets a null passed in, even if the field is left empty
* UNLESS it had attribute <code>disabled="disabled"</code> set.
*
* @return True if this component's input can be null. Returns true by default.
*/
public boolean isInputNullable()
{
return true;
}
/**
* @return True if this component encodes data in a multipart form submit
*/
public boolean isMultiPart()
{
return false;
}
/**
* @return whether or not this component's value is required
*/
public boolean isRequired()
{
return getFlag(FLAG_REQUIRED);
}
/**
* Gets whether this component is 'valid'. Valid in this context means that no validation errors
* were reported the last time the form component was processed. This variable not only is
* convenient for 'business' use, but is also necessary as we don't want the form component
* models updated with invalid input.
*
* @return valid whether this component is 'valid'
*/
public final boolean isValid()
{
class IsValidVisitor implements IVisitor<FormComponent<?>, Boolean>
{
@Override
public void component(final FormComponent<?> formComponent, final IVisit<Boolean> visit)
{
if (formComponent.hasErrorMessage())
{
visit.stop(Boolean.FALSE);
}
}
}
IsValidVisitor tmp = new IsValidVisitor();
final Object result = visitFormComponentsPostOrder(this, tmp);
return (Boolean.FALSE != result);
}
/**
* @see IFormVisitorParticipant#processChildren()
*/
@Override
public boolean processChildren()
{
return true;
}
/**
* This method will retrieve the request parameter, validate it, and if valid update the model.
* These are the same steps as would be performed by the form.
*
* This is useful when a formcomponent is used outside a form.
*
*/
public final void processInput()
{
inputChanged();
validate();
if (hasErrorMessage())
{
invalid();
}
else
{
valid();
updateModel();
}
}
/**
* The value will be made available to the validator property by means of ${label}. It does not
* have any specific meaning to FormComponent itself.
*
* @param labelModel
* @return this for chaining
*/
@Override
public FormComponent<T> setLabel(IModel<String> labelModel)
{
super.setLabel(labelModel);
return this;
}
/**
* Sets the value for a form component.
*
* @param value
* The value
*/
public void setModelValue(final String[] value)
{
convertedInput = convertValue(value);
updateModel();
}
/**
* Sets the required flag
*
* @param required
* @return this for chaining
*/
public final FormComponent<T> setRequired(final boolean required)
{
if (!required && getType() != null && getType().isPrimitive())
{
throw new WicketRuntimeException(
"FormComponent can't be required when the type is primitive class: " + this);
}
if (required != isRequired())
{
addStateChange();
}
setFlag(FLAG_REQUIRED, required);
return this;
}
/**
* Sets the type that will be used when updating the model for this component. If no type is
* specified String type is assumed.
*
* @param type
* @return this for chaining
*/
public FormComponent<T> setType(Class<?> type)
{
typeName = type == null ? null : type.getName();
if (type != null && type.isPrimitive())
{
setRequired(true);
}
return this;
}
/**
* Updates this components model from the request, it expects that the object is already
* converted through the convertInput() call that is called by the validate() method when a form
* is being processed.
*
* By default it just does this:
*
* <pre>
* setModelObject(getConvertedInput());
* </pre>
*
* DO NOT CALL THIS METHOD DIRECTLY UNLESS YOU ARE SURE WHAT YOU ARE DOING. USUALLY UPDATING
* YOUR MODEL IS HANDLED BY THE FORM, NOT DIRECTLY BY YOU.
*/
@Override
public void updateModel()
{
setModelObject(getConvertedInput());
}
/**
* Called to indicate that the user input is valid.
*/
public final void valid()
{
clearInput();
onValid();
}
/**
* Performs full validation of the form component, which consists of calling validateRequired(),
* convertInput(), and validateValidators(). This method should only be used if the form
* component needs to be fully validated outside the form process.
*/
public void validate()
{
// clear any previous feedback messages
if (hasFeedbackMessage())
{
getFeedbackMessages().clear();
}
// validate
validateRequired();
if (isValid())
{
convertInput();
if (isValid())
{
if (isRequired() && getConvertedInput() == null && isInputNullable())
{
reportRequiredError();
}
else
{
validateValidators();
}
}
}
}
/**
* Converts and validates the conversion of the raw input string into the object specified by
* {@link FormComponent#getType()} and records any errors. Converted value is available through
* {@link FormComponent#getConvertedInput()}.
*
* <p>
* Usually the user should do custom conversions by specifying an {@link IConverter} by
* registering it with the application by overriding {@link Application#getConverterLocator()},
* or at the component level by overriding {@link #getConverter(Class)} .
* </p>
*
* @see IConverterLocator
* @see Application#newConverterLocator()
*/
protected void convertInput()
{
if (typeName == null)
{
try
{
convertedInput = convertValue(getInputAsArray());
}
catch (ConversionException e)
{
ValidationError error = new ValidationError();
if (e.getResourceKey() != null)
{
error.addKey(e.getResourceKey());
}
if (e.getTargetType() != null)
{
error.addKey("ConversionError." + e.getTargetType().getSimpleName());
}
error.addKey("ConversionError");
reportValidationError(e, error);
}
}
else
{
final IConverter<T> converter = getConverter(getType());
try
{
convertedInput = converter.convertToObject(getInput(), getLocale());
}
catch (ConversionException e)
{
ValidationError error = new ValidationError();
if (e.getResourceKey() != null)
{
error.addKey(e.getResourceKey());
}
String simpleName = getType().getSimpleName();
error.addKey("IConverter." + simpleName);
error.addKey("IConverter");
error.setVariable("type", simpleName);
reportValidationError(e, error);
}
}
}
/**
*
* @param e
* @param error
*/
private void reportValidationError(ConversionException e, ValidationError error)
{
final Locale locale = e.getLocale();
if (locale != null)
{
error.setVariable("locale", locale);
}
error.setVariable("exception", e);
Format format = e.getFormat();
if (format instanceof SimpleDateFormat)
{
error.setVariable("format", ((SimpleDateFormat)format).toLocalizedPattern());
}
Map<String, Object> variables = e.getVariables();
if (variables != null)
{
error.getVariables().putAll(variables);
}
error(error);
}
/**
* Subclasses should overwrite this if the conversion is not done through the type field and the
* {@link IConverter}. <strong>WARNING: this method may be removed in future versions.</strong>
*
* If conversion fails then a ConversionException should be thrown
*
* @param value
* The value can be the getInput() or through a cookie
*
* @return The converted value. default returns just the given value
* @throws ConversionException
* If input can't be converted
*/
@SuppressWarnings("unchecked")
protected T convertValue(String[] value) throws ConversionException
{
return (T)(value != null && value.length > 0 && value[0] != null ? trim(value[0]) : null);
}
/**
* @return Value to return when model value is needed
*/
protected String getModelValue()
{
return getDefaultModelObjectAsString();
}
/**
* Gets the request parameter for this component as an int.
*
* @return The value in the request for this component
*/
protected final int inputAsInt()
{
final String string = getInput();
try
{
return Integer.parseInt(string);
}
catch (NumberFormatException e)
{
throw new IllegalArgumentException(
exceptionMessage("Internal error. Request string '" + string +
"' not a valid integer"));
}
}
/**
* Gets the request parameter for this component as an int, using the given default in case no
* corresponding request parameter was found.
*
* @param defaultValue
* Default value to return if request does not have an integer for this component
* @return The value in the request for this component
*/
protected final int inputAsInt(final int defaultValue)
{
final String string = getInput();
if (string != null)
{
try
{
return Integer.parseInt(string);
}
catch (NumberFormatException e)
{
throw new IllegalArgumentException(exceptionMessage("Request string '" + string +
"' is not a valid integer"));
}
}
else
{
return defaultValue;
}
}
/**
* Gets the request parameters for this component as ints.
*
* @return The values in the request for this component
*/
protected final int[] inputAsIntArray()
{
final String[] strings = getInputAsArray();
if (strings != null)
{
final int[] ints = new int[strings.length];
for (int i = 0; i < strings.length; i++)
{
ints[i] = Integer.parseInt(strings[i]);
}
return ints;
}
return null;
}
/**
* @see org.apache.wicket.Component#internalOnModelChanged()
*/
@Override
protected void internalOnModelChanged()
{
// If the model for this form component changed, we should make it
// valid again because there can't be any invalid input for it anymore.
valid();
}
/**
* Processes the component tag.
*
* @param tag
* Tag to modify
* @see org.apache.wicket.Component#onComponentTag(ComponentTag)
*/
@Override
protected void onComponentTag(final ComponentTag tag)
{
tag.put("name", getInputName());
if (!isEnabledInHierarchy())
{
onDisabled(tag);
}
super.onComponentTag(tag);
}
/**
* Sets the temporary converted input value to null.
*
* @see org.apache.wicket.Component#onDetach()
*/
@Override
protected void onDetach()
{
super.onDetach();
convertedInput = null;
}
/**
* Called by {@link #onComponentTag(ComponentTag)} when the component is disabled. By default,
* this method will add a disabled="disabled" attribute to the tag. Components may override this
* method to tweak the tag as they think is fit.
*
* @param tag
* the tag that is being rendered
*/
protected void onDisabled(final ComponentTag tag)
{
tag.put("disabled", "disabled");
}
/**
* Handle invalidation
*/
protected void onInvalid()
{
}
/**
* Handle validation
*/
protected void onValid()
{
}
/**
* Determines whether or not this component should trim its input prior to processing it. The
* default value is <code>true</code>
*
* @return True if the input should be trimmed.
*/
protected boolean shouldTrimInput()
{
return true;
}
/**
* Trims the input according to {@link #shouldTrimInput()}
*
* @param string
* @return trimmed input if {@link #shouldTrimInput()} returns true, unchanged input otherwise
*/
protected final String trim(String string)
{
String trimmed = string;
if (trimmed != null && shouldTrimInput())
{
trimmed = trimmed.trim();
}
return trimmed;
}
/**
* Checks if the raw input value is not null if this component is required.
*/
protected final void validateRequired()
{
if (!checkRequired())
{
reportRequiredError();
}
}
/**
* Reports required error against this component
*/
private void reportRequiredError()
{
error(new ValidationError().addKey("Required"));
}
/**
* Validates this component using the component's validators.
*/
@SuppressWarnings("unchecked")
protected final void validateValidators()
{
final IValidatable<T> validatable = newValidatable();
boolean isNull = getConvertedInput() == null;
IValidator<T> validator = null;
try
{
for (Behavior behavior : getBehaviors())
{
validator = null;
if (behavior instanceof ValidatorAdapter)
{
validator = ((ValidatorAdapter<T>)behavior).getValidator();
}
else if (behavior instanceof IValidator)
{
validator = (IValidator<T>)behavior;
}
if (validator != null)
{
if (isNull == false || validator instanceof INullAcceptingValidator<?>)
{
validator.validate(validatable);
}
if (!isValid())
{
break;
}
}
}
}
catch (Exception e)
{
throw new WicketRuntimeException("Exception '" + e.getMessage() +
"' occurred during validation " + validator.getClass().getName() +
" on component " + getPath(), e);
}
}
/**
* Creates an IValidatable that can be used to validate this form component. This validatable
* incorporates error key lookups that correspond to this form component.
*
* This method is useful when validation needs to happen outside the regular validation workflow
* but error messages should still be properly reported against the form component.
*
* @return IValidatable<T> for this form component
*/
public final IValidatable<T> newValidatable()
{
return new ValidatableAdapter();
}
/**
* Gets model
*
* @return model
*/
@SuppressWarnings("unchecked")
public final IModel<T> getModel()
{
return (IModel<T>)getDefaultModel();
}
/**
* Sets model
*
* @param model
*/
public final void setModel(IModel<T> model)
{
setDefaultModel(model);
}
/**
* Gets model object
*
* @return model object
*/
@SuppressWarnings("unchecked")
public final T getModelObject()
{
return (T)getDefaultModelObject();
}
/**
* Sets model object
*
* @param object
*/
public final void setModelObject(T object)
{
setDefaultModelObject(object);
}
/**
* Update the model of a {@link FormComponent} containing a {@link Collection}.
*
* If the model object does not yet exists, a new {@link ArrayList} is filled with the converted
* input and used as the new model object. Otherwise the existing collection is modified
* in-place, then {@link Model#setObject(Object)} is called with the same instance: it allows
* the Model to be notified of changes even when {@link Model#getObject()} returns a different
* {@link Collection} at every invocation.
*
* @param <S>
* collection type
* @param formComponent
* the form component to update
* @see FormComponent#updateModel()
* @throws UnsupportedOperationException
* if the existing model object Collection cannot be modified
*/
public static <S> void updateCollectionModel(FormComponent<Collection<S>> formComponent)
{
Collection<S> convertedInput = formComponent.getConvertedInput();
Collection<S> collection = formComponent.getModelObject();
if (collection == null)
{
collection = new ArrayList<S>(convertedInput);
formComponent.setDefaultModelObject(collection);
}
else
{
formComponent.modelChanging();
collection.clear();
if (convertedInput != null)
{
collection.addAll(convertedInput);
}
formComponent.modelChanged();
try
{
formComponent.getModel().setObject(collection);
}
catch (Exception e)
{
// ignore this exception because it could be that there
// is not setter for this collection.
logger.info("no setter for the property attached to " + formComponent);
}
}
}
}