spring PropertyEditorRegistrySupport 源码
spring PropertyEditorRegistrySupport 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/PropertyEditorRegistrySupport.java
/*
* Copyright 2002-2021 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
*
* https://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.beans;
import java.beans.PropertyEditor;
import java.io.File;
import java.io.InputStream;
import java.io.Reader;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.URI;
import java.net.URL;
import java.nio.charset.Charset;
import java.nio.file.Path;
import java.time.ZoneId;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Currency;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import java.util.TimeZone;
import java.util.UUID;
import java.util.regex.Pattern;
import org.xml.sax.InputSource;
import org.springframework.beans.propertyeditors.ByteArrayPropertyEditor;
import org.springframework.beans.propertyeditors.CharArrayPropertyEditor;
import org.springframework.beans.propertyeditors.CharacterEditor;
import org.springframework.beans.propertyeditors.CharsetEditor;
import org.springframework.beans.propertyeditors.ClassArrayEditor;
import org.springframework.beans.propertyeditors.ClassEditor;
import org.springframework.beans.propertyeditors.CurrencyEditor;
import org.springframework.beans.propertyeditors.CustomBooleanEditor;
import org.springframework.beans.propertyeditors.CustomCollectionEditor;
import org.springframework.beans.propertyeditors.CustomMapEditor;
import org.springframework.beans.propertyeditors.CustomNumberEditor;
import org.springframework.beans.propertyeditors.FileEditor;
import org.springframework.beans.propertyeditors.InputSourceEditor;
import org.springframework.beans.propertyeditors.InputStreamEditor;
import org.springframework.beans.propertyeditors.LocaleEditor;
import org.springframework.beans.propertyeditors.PathEditor;
import org.springframework.beans.propertyeditors.PatternEditor;
import org.springframework.beans.propertyeditors.PropertiesEditor;
import org.springframework.beans.propertyeditors.ReaderEditor;
import org.springframework.beans.propertyeditors.StringArrayPropertyEditor;
import org.springframework.beans.propertyeditors.TimeZoneEditor;
import org.springframework.beans.propertyeditors.URIEditor;
import org.springframework.beans.propertyeditors.URLEditor;
import org.springframework.beans.propertyeditors.UUIDEditor;
import org.springframework.beans.propertyeditors.ZoneIdEditor;
import org.springframework.core.SpringProperties;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.ResourceArrayPropertyEditor;
import org.springframework.lang.Nullable;
import org.springframework.util.ClassUtils;
/**
* Base implementation of the {@link PropertyEditorRegistry} interface.
* Provides management of default editors and custom editors.
* Mainly serves as base class for {@link BeanWrapperImpl}.
*
* @author Juergen Hoeller
* @author Rob Harrop
* @author Sebastien Deleuze
* @since 1.2.6
* @see java.beans.PropertyEditorManager
* @see java.beans.PropertyEditorSupport#setAsText
* @see java.beans.PropertyEditorSupport#setValue
*/
public class PropertyEditorRegistrySupport implements PropertyEditorRegistry {
/**
* Boolean flag controlled by a {@code spring.xml.ignore} system property that instructs Spring to
* ignore XML, i.e. to not initialize the XML-related infrastructure.
* <p>The default is "false".
*/
private static final boolean shouldIgnoreXml = SpringProperties.getFlag("spring.xml.ignore");
@Nullable
private ConversionService conversionService;
private boolean defaultEditorsActive = false;
private boolean configValueEditorsActive = false;
@Nullable
private Map<Class<?>, PropertyEditor> defaultEditors;
@Nullable
private Map<Class<?>, PropertyEditor> overriddenDefaultEditors;
@Nullable
private Map<Class<?>, PropertyEditor> customEditors;
@Nullable
private Map<String, CustomEditorHolder> customEditorsForPath;
@Nullable
private Map<Class<?>, PropertyEditor> customEditorCache;
/**
* Specify a Spring 3.0 ConversionService to use for converting
* property values, as an alternative to JavaBeans PropertyEditors.
*/
public void setConversionService(@Nullable ConversionService conversionService) {
this.conversionService = conversionService;
}
/**
* Return the associated ConversionService, if any.
*/
@Nullable
public ConversionService getConversionService() {
return this.conversionService;
}
//---------------------------------------------------------------------
// Management of default editors
//---------------------------------------------------------------------
/**
* Activate the default editors for this registry instance,
* allowing for lazily registering default editors when needed.
*/
protected void registerDefaultEditors() {
this.defaultEditorsActive = true;
}
/**
* Activate config value editors which are only intended for configuration purposes,
* such as {@link org.springframework.beans.propertyeditors.StringArrayPropertyEditor}.
* <p>Those editors are not registered by default simply because they are in
* general inappropriate for data binding purposes. Of course, you may register
* them individually in any case, through {@link #registerCustomEditor}.
*/
public void useConfigValueEditors() {
this.configValueEditorsActive = true;
}
/**
* Override the default editor for the specified type with the given property editor.
* <p>Note that this is different from registering a custom editor in that the editor
* semantically still is a default editor. A ConversionService will override such a
* default editor, whereas custom editors usually override the ConversionService.
* @param requiredType the type of the property
* @param propertyEditor the editor to register
* @see #registerCustomEditor(Class, PropertyEditor)
*/
public void overrideDefaultEditor(Class<?> requiredType, PropertyEditor propertyEditor) {
if (this.overriddenDefaultEditors == null) {
this.overriddenDefaultEditors = new HashMap<>();
}
this.overriddenDefaultEditors.put(requiredType, propertyEditor);
}
/**
* Retrieve the default editor for the given property type, if any.
* <p>Lazily registers the default editors, if they are active.
* @param requiredType type of the property
* @return the default editor, or {@code null} if none found
* @see #registerDefaultEditors
*/
@Nullable
public PropertyEditor getDefaultEditor(Class<?> requiredType) {
if (!this.defaultEditorsActive) {
return null;
}
if (this.overriddenDefaultEditors != null) {
PropertyEditor editor = this.overriddenDefaultEditors.get(requiredType);
if (editor != null) {
return editor;
}
}
if (this.defaultEditors == null) {
createDefaultEditors();
}
return this.defaultEditors.get(requiredType);
}
/**
* Actually register the default editors for this registry instance.
*/
private void createDefaultEditors() {
this.defaultEditors = new HashMap<>(64);
// Simple editors, without parameterization capabilities.
// The JDK does not contain a default editor for any of these target types.
this.defaultEditors.put(Charset.class, new CharsetEditor());
this.defaultEditors.put(Class.class, new ClassEditor());
this.defaultEditors.put(Class[].class, new ClassArrayEditor());
this.defaultEditors.put(Currency.class, new CurrencyEditor());
this.defaultEditors.put(File.class, new FileEditor());
this.defaultEditors.put(InputStream.class, new InputStreamEditor());
if (!shouldIgnoreXml) {
this.defaultEditors.put(InputSource.class, new InputSourceEditor());
}
this.defaultEditors.put(Locale.class, new LocaleEditor());
this.defaultEditors.put(Path.class, new PathEditor());
this.defaultEditors.put(Pattern.class, new PatternEditor());
this.defaultEditors.put(Properties.class, new PropertiesEditor());
this.defaultEditors.put(Reader.class, new ReaderEditor());
this.defaultEditors.put(Resource[].class, new ResourceArrayPropertyEditor());
this.defaultEditors.put(TimeZone.class, new TimeZoneEditor());
this.defaultEditors.put(URI.class, new URIEditor());
this.defaultEditors.put(URL.class, new URLEditor());
this.defaultEditors.put(UUID.class, new UUIDEditor());
this.defaultEditors.put(ZoneId.class, new ZoneIdEditor());
// Default instances of collection editors.
// Can be overridden by registering custom instances of those as custom editors.
this.defaultEditors.put(Collection.class, new CustomCollectionEditor(Collection.class));
this.defaultEditors.put(Set.class, new CustomCollectionEditor(Set.class));
this.defaultEditors.put(SortedSet.class, new CustomCollectionEditor(SortedSet.class));
this.defaultEditors.put(List.class, new CustomCollectionEditor(List.class));
this.defaultEditors.put(SortedMap.class, new CustomMapEditor(SortedMap.class));
// Default editors for primitive arrays.
this.defaultEditors.put(byte[].class, new ByteArrayPropertyEditor());
this.defaultEditors.put(char[].class, new CharArrayPropertyEditor());
// The JDK does not contain a default editor for char!
this.defaultEditors.put(char.class, new CharacterEditor(false));
this.defaultEditors.put(Character.class, new CharacterEditor(true));
// Spring's CustomBooleanEditor accepts more flag values than the JDK's default editor.
this.defaultEditors.put(boolean.class, new CustomBooleanEditor(false));
this.defaultEditors.put(Boolean.class, new CustomBooleanEditor(true));
// The JDK does not contain default editors for number wrapper types!
// Override JDK primitive number editors with our own CustomNumberEditor.
this.defaultEditors.put(byte.class, new CustomNumberEditor(Byte.class, false));
this.defaultEditors.put(Byte.class, new CustomNumberEditor(Byte.class, true));
this.defaultEditors.put(short.class, new CustomNumberEditor(Short.class, false));
this.defaultEditors.put(Short.class, new CustomNumberEditor(Short.class, true));
this.defaultEditors.put(int.class, new CustomNumberEditor(Integer.class, false));
this.defaultEditors.put(Integer.class, new CustomNumberEditor(Integer.class, true));
this.defaultEditors.put(long.class, new CustomNumberEditor(Long.class, false));
this.defaultEditors.put(Long.class, new CustomNumberEditor(Long.class, true));
this.defaultEditors.put(float.class, new CustomNumberEditor(Float.class, false));
this.defaultEditors.put(Float.class, new CustomNumberEditor(Float.class, true));
this.defaultEditors.put(double.class, new CustomNumberEditor(Double.class, false));
this.defaultEditors.put(Double.class, new CustomNumberEditor(Double.class, true));
this.defaultEditors.put(BigDecimal.class, new CustomNumberEditor(BigDecimal.class, true));
this.defaultEditors.put(BigInteger.class, new CustomNumberEditor(BigInteger.class, true));
// Only register config value editors if explicitly requested.
if (this.configValueEditorsActive) {
StringArrayPropertyEditor sae = new StringArrayPropertyEditor();
this.defaultEditors.put(String[].class, sae);
this.defaultEditors.put(short[].class, sae);
this.defaultEditors.put(int[].class, sae);
this.defaultEditors.put(long[].class, sae);
}
}
/**
* Copy the default editors registered in this instance to the given target registry.
* @param target the target registry to copy to
*/
protected void copyDefaultEditorsTo(PropertyEditorRegistrySupport target) {
target.defaultEditorsActive = this.defaultEditorsActive;
target.configValueEditorsActive = this.configValueEditorsActive;
target.defaultEditors = this.defaultEditors;
target.overriddenDefaultEditors = this.overriddenDefaultEditors;
}
//---------------------------------------------------------------------
// Management of custom editors
//---------------------------------------------------------------------
@Override
public void registerCustomEditor(Class<?> requiredType, PropertyEditor propertyEditor) {
registerCustomEditor(requiredType, null, propertyEditor);
}
@Override
public void registerCustomEditor(@Nullable Class<?> requiredType, @Nullable String propertyPath, PropertyEditor propertyEditor) {
if (requiredType == null && propertyPath == null) {
throw new IllegalArgumentException("Either requiredType or propertyPath is required");
}
if (propertyPath != null) {
if (this.customEditorsForPath == null) {
this.customEditorsForPath = new LinkedHashMap<>(16);
}
this.customEditorsForPath.put(propertyPath, new CustomEditorHolder(propertyEditor, requiredType));
}
else {
if (this.customEditors == null) {
this.customEditors = new LinkedHashMap<>(16);
}
this.customEditors.put(requiredType, propertyEditor);
this.customEditorCache = null;
}
}
@Override
@Nullable
public PropertyEditor findCustomEditor(@Nullable Class<?> requiredType, @Nullable String propertyPath) {
Class<?> requiredTypeToUse = requiredType;
if (propertyPath != null) {
if (this.customEditorsForPath != null) {
// Check property-specific editor first.
PropertyEditor editor = getCustomEditor(propertyPath, requiredType);
if (editor == null) {
List<String> strippedPaths = new ArrayList<>();
addStrippedPropertyPaths(strippedPaths, "", propertyPath);
for (Iterator<String> it = strippedPaths.iterator(); it.hasNext() && editor == null;) {
String strippedPath = it.next();
editor = getCustomEditor(strippedPath, requiredType);
}
}
if (editor != null) {
return editor;
}
}
if (requiredType == null) {
requiredTypeToUse = getPropertyType(propertyPath);
}
}
// No property-specific editor -> check type-specific editor.
return getCustomEditor(requiredTypeToUse);
}
/**
* Determine whether this registry contains a custom editor
* for the specified array/collection element.
* @param elementType the target type of the element
* (can be {@code null} if not known)
* @param propertyPath the property path (typically of the array/collection;
* can be {@code null} if not known)
* @return whether a matching custom editor has been found
*/
public boolean hasCustomEditorForElement(@Nullable Class<?> elementType, @Nullable String propertyPath) {
if (propertyPath != null && this.customEditorsForPath != null) {
for (Map.Entry<String, CustomEditorHolder> entry : this.customEditorsForPath.entrySet()) {
if (PropertyAccessorUtils.matchesProperty(entry.getKey(), propertyPath) &&
entry.getValue().getPropertyEditor(elementType) != null) {
return true;
}
}
}
// No property-specific editor -> check type-specific editor.
return (elementType != null && this.customEditors != null && this.customEditors.containsKey(elementType));
}
/**
* Determine the property type for the given property path.
* <p>Called by {@link #findCustomEditor} if no required type has been specified,
* to be able to find a type-specific editor even if just given a property path.
* <p>The default implementation always returns {@code null}.
* BeanWrapperImpl overrides this with the standard {@code getPropertyType}
* method as defined by the BeanWrapper interface.
* @param propertyPath the property path to determine the type for
* @return the type of the property, or {@code null} if not determinable
* @see BeanWrapper#getPropertyType(String)
*/
@Nullable
protected Class<?> getPropertyType(String propertyPath) {
return null;
}
/**
* Get custom editor that has been registered for the given property.
* @param propertyName the property path to look for
* @param requiredType the type to look for
* @return the custom editor, or {@code null} if none specific for this property
*/
@Nullable
private PropertyEditor getCustomEditor(String propertyName, @Nullable Class<?> requiredType) {
CustomEditorHolder holder =
(this.customEditorsForPath != null ? this.customEditorsForPath.get(propertyName) : null);
return (holder != null ? holder.getPropertyEditor(requiredType) : null);
}
/**
* Get custom editor for the given type. If no direct match found,
* try custom editor for superclass (which will in any case be able
* to render a value as String via {@code getAsText}).
* @param requiredType the type to look for
* @return the custom editor, or {@code null} if none found for this type
* @see java.beans.PropertyEditor#getAsText()
*/
@Nullable
private PropertyEditor getCustomEditor(@Nullable Class<?> requiredType) {
if (requiredType == null || this.customEditors == null) {
return null;
}
// Check directly registered editor for type.
PropertyEditor editor = this.customEditors.get(requiredType);
if (editor == null) {
// Check cached editor for type, registered for superclass or interface.
if (this.customEditorCache != null) {
editor = this.customEditorCache.get(requiredType);
}
if (editor == null) {
// Find editor for superclass or interface.
for (Map.Entry<Class<?>, PropertyEditor> entry : this.customEditors.entrySet()) {
Class<?> key = entry.getKey();
if (key.isAssignableFrom(requiredType)) {
editor = entry.getValue();
// Cache editor for search type, to avoid the overhead
// of repeated assignable-from checks.
if (this.customEditorCache == null) {
this.customEditorCache = new HashMap<>();
}
this.customEditorCache.put(requiredType, editor);
if (editor != null) {
break;
}
}
}
}
}
return editor;
}
/**
* Guess the property type of the specified property from the registered
* custom editors (provided that they were registered for a specific type).
* @param propertyName the name of the property
* @return the property type, or {@code null} if not determinable
*/
@Nullable
protected Class<?> guessPropertyTypeFromEditors(String propertyName) {
if (this.customEditorsForPath != null) {
CustomEditorHolder editorHolder = this.customEditorsForPath.get(propertyName);
if (editorHolder == null) {
List<String> strippedPaths = new ArrayList<>();
addStrippedPropertyPaths(strippedPaths, "", propertyName);
for (Iterator<String> it = strippedPaths.iterator(); it.hasNext() && editorHolder == null;) {
String strippedName = it.next();
editorHolder = this.customEditorsForPath.get(strippedName);
}
}
if (editorHolder != null) {
return editorHolder.getRegisteredType();
}
}
return null;
}
/**
* Copy the custom editors registered in this instance to the given target registry.
* @param target the target registry to copy to
* @param nestedProperty the nested property path of the target registry, if any.
* If this is non-null, only editors registered for a path below this nested property
* will be copied. If this is null, all editors will be copied.
*/
protected void copyCustomEditorsTo(PropertyEditorRegistry target, @Nullable String nestedProperty) {
String actualPropertyName =
(nestedProperty != null ? PropertyAccessorUtils.getPropertyName(nestedProperty) : null);
if (this.customEditors != null) {
this.customEditors.forEach(target::registerCustomEditor);
}
if (this.customEditorsForPath != null) {
this.customEditorsForPath.forEach((editorPath, editorHolder) -> {
if (nestedProperty != null) {
int pos = PropertyAccessorUtils.getFirstNestedPropertySeparatorIndex(editorPath);
if (pos != -1) {
String editorNestedProperty = editorPath.substring(0, pos);
String editorNestedPath = editorPath.substring(pos + 1);
if (editorNestedProperty.equals(nestedProperty) || editorNestedProperty.equals(actualPropertyName)) {
target.registerCustomEditor(
editorHolder.getRegisteredType(), editorNestedPath, editorHolder.getPropertyEditor());
}
}
}
else {
target.registerCustomEditor(
editorHolder.getRegisteredType(), editorPath, editorHolder.getPropertyEditor());
}
});
}
}
/**
* Add property paths with all variations of stripped keys and/or indexes.
* Invokes itself recursively with nested paths.
* @param strippedPaths the result list to add to
* @param nestedPath the current nested path
* @param propertyPath the property path to check for keys/indexes to strip
*/
private void addStrippedPropertyPaths(List<String> strippedPaths, String nestedPath, String propertyPath) {
int startIndex = propertyPath.indexOf(PropertyAccessor.PROPERTY_KEY_PREFIX_CHAR);
if (startIndex != -1) {
int endIndex = propertyPath.indexOf(PropertyAccessor.PROPERTY_KEY_SUFFIX_CHAR);
if (endIndex != -1) {
String prefix = propertyPath.substring(0, startIndex);
String key = propertyPath.substring(startIndex, endIndex + 1);
String suffix = propertyPath.substring(endIndex + 1);
// Strip the first key.
strippedPaths.add(nestedPath + prefix + suffix);
// Search for further keys to strip, with the first key stripped.
addStrippedPropertyPaths(strippedPaths, nestedPath + prefix, suffix);
// Search for further keys to strip, with the first key not stripped.
addStrippedPropertyPaths(strippedPaths, nestedPath + prefix + key, suffix);
}
}
}
/**
* Holder for a registered custom editor with property name.
* Keeps the PropertyEditor itself plus the type it was registered for.
*/
private static final class CustomEditorHolder {
private final PropertyEditor propertyEditor;
@Nullable
private final Class<?> registeredType;
private CustomEditorHolder(PropertyEditor propertyEditor, @Nullable Class<?> registeredType) {
this.propertyEditor = propertyEditor;
this.registeredType = registeredType;
}
private PropertyEditor getPropertyEditor() {
return this.propertyEditor;
}
@Nullable
private Class<?> getRegisteredType() {
return this.registeredType;
}
@Nullable
private PropertyEditor getPropertyEditor(@Nullable Class<?> requiredType) {
// Special case: If no required type specified, which usually only happens for
// Collection elements, or required type is not assignable to registered type,
// which usually only happens for generic properties of type Object -
// then return PropertyEditor if not registered for Collection or array type.
// (If not registered for Collection or array, it is assumed to be intended
// for elements.)
if (this.registeredType == null ||
(requiredType != null &&
(ClassUtils.isAssignable(this.registeredType, requiredType) ||
ClassUtils.isAssignable(requiredType, this.registeredType))) ||
(requiredType == null &&
(!Collection.class.isAssignableFrom(this.registeredType) && !this.registeredType.isArray()))) {
return this.propertyEditor;
}
else {
return null;
}
}
}
}
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