/*
* Copyright 2002-2008 the original author or authors.
*
* 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.springframework.validation;
import java.beans.PropertyEditor;
import java.io.Serializable;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.springframework.beans.PropertyEditorRegistry;
import org.springframework.util.StringUtils;
/**
* Abstract implementation of the {@link BindingResult} interface and
* its super-interface {@link Errors}. Encapsulates common management of
* {@link ObjectError ObjectErrors} and {@link FieldError FieldErrors}.
*
* @author Juergen Hoeller
* @author Rob Harrop
* @since 2.0
* @see Errors
*/
public abstract class AbstractBindingResult extends AbstractErrors implements BindingResult, Serializable {
private final String objectName;
private MessageCodesResolver messageCodesResolver = new DefaultMessageCodesResolver();
private final List errors = new LinkedList();
private final Set suppressedFields = new HashSet();
/**
* Create a new AbstractBindingResult instance.
* @param objectName the name of the target object
* @see DefaultMessageCodesResolver
*/
protected AbstractBindingResult(String objectName) {
this.objectName = objectName;
}
/**
* Set the strategy to use for resolving errors into message codes.
* Default is DefaultMessageCodesResolver.
* @see DefaultMessageCodesResolver
*/
public void setMessageCodesResolver(MessageCodesResolver messageCodesResolver) {
this.messageCodesResolver = messageCodesResolver;
}
/**
* Return the strategy to use for resolving errors into message codes.
*/
public MessageCodesResolver getMessageCodesResolver() {
return this.messageCodesResolver;
}
//---------------------------------------------------------------------
// Implementation of the Errors interface
//---------------------------------------------------------------------
public String getObjectName() {
return this.objectName;
}
public void reject(String errorCode, Object[] errorArgs, String defaultMessage) {
addError(new ObjectError(getObjectName(), resolveMessageCodes(errorCode), errorArgs, defaultMessage));
}
public void rejectValue(String field, String errorCode, Object[] errorArgs, String defaultMessage) {
if ("".equals(getNestedPath()) && !StringUtils.hasLength(field)) {
// We're at the top of the nested object hierarchy,
// so the present level is not a field but rather the top object.
// The best we can do is register a global error here...
reject(errorCode, errorArgs, defaultMessage);
return;
}
String fixedField = fixedField(field);
Object newVal = getActualFieldValue(fixedField);
FieldError fe = new FieldError(
getObjectName(), fixedField, newVal, false,
resolveMessageCodes(errorCode, field), errorArgs, defaultMessage);
addError(fe);
}
public void addError(ObjectError error) {
this.errors.add(error);
}
public void addAllErrors(Errors errors) {
if (!errors.getObjectName().equals(getObjectName())) {
throw new IllegalArgumentException("Errors object needs to have same object name");
}
this.errors.addAll(errors.getAllErrors());
}
/**
* Resolve the given error code into message codes.
* Calls the MessageCodesResolver with appropriate parameters.
* @param errorCode the error code to resolve into message codes
* @return the resolved message codes
* @see #setMessageCodesResolver
*/
public String[] resolveMessageCodes(String errorCode) {
return getMessageCodesResolver().resolveMessageCodes(errorCode, getObjectName());
}
public String[] resolveMessageCodes(String errorCode, String field) {
String fixedField = fixedField(field);
Class fieldType = getFieldType(fixedField);
return getMessageCodesResolver().resolveMessageCodes(errorCode, getObjectName(), fixedField, fieldType);
}
public boolean hasErrors() {
return !this.errors.isEmpty();
}
public int getErrorCount() {
return this.errors.size();
}
public List getAllErrors() {
return Collections.unmodifiableList(this.errors);
}
public List getGlobalErrors() {
List result = new LinkedList();
for (Iterator it = this.errors.iterator(); it.hasNext();) {
Object error = it.next();
if (!(error instanceof FieldError)) {
result.add(error);
}
}
return Collections.unmodifiableList(result);
}
public ObjectError getGlobalError() {
for (Iterator it = this.errors.iterator(); it.hasNext();) {
ObjectError objectError = (ObjectError) it.next();
if (!(objectError instanceof FieldError)) {
return objectError;
}
}
return null;
}
public List getFieldErrors() {
List result = new LinkedList();
for (Iterator it = this.errors.iterator(); it.hasNext();) {
Object error = it.next();
if (error instanceof FieldError) {
result.add(error);
}
}
return Collections.unmodifiableList(result);
}
public FieldError getFieldError() {
for (Iterator it = this.errors.iterator(); it.hasNext();) {
Object error = it.next();
if (error instanceof FieldError) {
return (FieldError) error;
}
}
return null;
}
public List getFieldErrors(String field) {
List result = new LinkedList();
String fixedField = fixedField(field);
for (Iterator it = this.errors.iterator(); it.hasNext();) {
Object error = it.next();
if (error instanceof FieldError && isMatchingFieldError(fixedField, (FieldError) error)) {
result.add(error);
}
}
return Collections.unmodifiableList(result);
}
public FieldError getFieldError(String field) {
String fixedField = fixedField(field);
for (Iterator it = this.errors.iterator(); it.hasNext();) {
Object error = it.next();
if (error instanceof FieldError) {
FieldError fe = (FieldError) error;
if (isMatchingFieldError(fixedField, fe)) {
return fe;
}
}
}
return null;
}
public Object getFieldValue(String field) {
FieldError fe = getFieldError(field);
// Use rejected value in case of error, current bean property value else.
Object value = null;
if (fe != null) {
value = fe.getRejectedValue();
}
else {
value = getActualFieldValue(fixedField(field));
}
// Apply formatting, but not on binding failures like type mismatches.
if (fe == null || !fe.isBindingFailure()) {
value = formatFieldValue(field, value);
}
return value;
}
/**
* This default implementation determines the type based on the actual
* field value, if any. Subclasses should override this to determine
* the type from a descriptor, even for <code>null</code> values.
* @see #getActualFieldValue
*/
public Class getFieldType(String field) {
Object value = getActualFieldValue(fixedField(field));
if (value != null) {
return value.getClass();
}
return null;
}
//---------------------------------------------------------------------
// Implementation of BindingResult interface
//---------------------------------------------------------------------
/**
* Return a model Map for the obtained state, exposing an Errors
* instance as '{@link #MODEL_KEY_PREFIX MODEL_KEY_PREFIX} + objectName'
* and the object itself.
* <p>Note that the Map is constructed every time you're calling this method.
* Adding things to the map and then re-calling this method will not work.
* <p>The attributes in the model Map returned by this method are usually
* included in the ModelAndView for a form view that uses Spring's bind tag,
* which needs access to the Errors instance. Spring's SimpleFormController
* will do this for you when rendering its form or success view. When
* building the ModelAndView yourself, you need to include the attributes
* from the model Map returned by this method yourself.
* @see #getObjectName
* @see #MODEL_KEY_PREFIX
* @see org.springframework.web.servlet.ModelAndView
* @see org.springframework.web.servlet.tags.BindTag
* @see org.springframework.web.servlet.mvc.SimpleFormController
*/
public Map getModel() {
Map model = new HashMap(2);
// Errors instance, even if no errors.
model.put(MODEL_KEY_PREFIX + getObjectName(), this);
// Mapping from name to target object.
model.put(getObjectName(), getTarget());
return model;
}
public Object getRawFieldValue(String field) {
return getActualFieldValue(fixedField(field));
}
/**
* This implementation delegates to the
* {@link #getPropertyEditorRegistry() PropertyEditorRegistry}'s
* editor lookup facility, if available.
*/
public PropertyEditor findEditor(String field, Class valueType) {
PropertyEditorRegistry editorRegistry = getPropertyEditorRegistry();
if (editorRegistry != null) {
Class valueTypeToUse = valueType;
if (valueTypeToUse == null) {
valueTypeToUse = getFieldType(field);
}
return editorRegistry.findCustomEditor(valueTypeToUse, fixedField(field));
}
else {
return null;
}
}
/**
* This implementation returns <code>null</code>.
*/
public PropertyEditorRegistry getPropertyEditorRegistry() {
return null;
}
/**
* Mark the specified disallowed field as suppressed.
* <p>The data binder invokes this for each field value that was
* detected to target a disallowed field.
* @see DataBinder#setAllowedFields
*/
public void recordSuppressedField(String field) {
this.suppressedFields.add(field);
}
/**
* Return the list of fields that were suppressed during the bind process.
* <p>Can be used to determine whether any field values were targetting
* disallowed fields.
* @see DataBinder#setAllowedFields
*/
public String[] getSuppressedFields() {
return StringUtils.toStringArray(this.suppressedFields);
}
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!(other instanceof BindingResult)) {
return false;
}
BindingResult otherResult = (BindingResult) other;
return (getObjectName().equals(otherResult.getObjectName()) &&
getTarget().equals(otherResult.getTarget()) &&
getAllErrors().equals(otherResult.getAllErrors()));
}
public int hashCode() {
return getObjectName().hashCode() * 29 + getTarget().hashCode();
}
//---------------------------------------------------------------------
// Template methods to be implemented/overridden by subclasses
//---------------------------------------------------------------------
/**
* Return the wrapped target object.
*/
public abstract Object getTarget();
/**
* Extract the actual field value for the given field.
* @param field the field to check
* @return the current value of the field
*/
protected abstract Object getActualFieldValue(String field);
/**
* Format the given value for the specified field.
* <p>The default implementation simply returns the field value as-is.
* @param field the field to check
* @param value the value of the field (either a rejected value
* other than from a binding error, or an actual field value)
* @return the formatted value
*/
protected Object formatFieldValue(String field, Object value) {
return value;
}
}
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