org.springframework/spring-beans/5.3.3 : org/springframework/beans/PropertyEditorRegistrySupport.java

PropertyEditorRegistrySupport
https://github.com/spring-projects/spring-framework: Spring Beans (Spring IO)
Apache License, Version 2.0
Juergen Hoeller
/*
 * Copyright 2002-2020 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 PropertyEditorRegistry interface. Provides management of default editors and custom editors. Mainly serves as base class for BeanWrapperImpl. 
Author: Juergen Hoeller, Rob Harrop, Sebastien Deleuze
See Also: PropertyEditorManager
PropertyEditorSupport.setAsText
PropertyEditorSupport.setValue
Since: 1.2.6/**
 * 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 spring.xml.ignore system property that instructs Spring to ignore XML, i.e. to not initialize the XML-related infrastructure. The default is "false".
/**
	 * 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.
/**
	 * 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.
/**
	 * 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.
/**
	 * 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 StringArrayPropertyEditor. 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 registerCustomEditor. /**
	 * 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.
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.
Params: requiredType – the type of the property
propertyEditor – the editor to register
See Also: registerCustomEditor(Class<?>, PropertyEditor)/**
	 * 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.
Lazily registers the default editors, if they are active.
Params: requiredType – type of the property
See Also: registerDefaultEditors
Returns: the default editor, or null if none found/**
	 * 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.
/**
	 * 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.
Params: target – the target registry to copy to/**
	 * 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.
Params: elementType – the target type of the element (can be null if not known)
propertyPath – the property path (typically of the array/collection; can be null if not known)
Returns: whether a matching custom editor has been found/**
	 * 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.
Called by findCustomEditor if no required type has been specified, to be able to find a type-specific editor even if just given a property path. 
The default implementation always returns null. BeanWrapperImpl overrides this with the standard getPropertyType method as defined by the BeanWrapper interface. 
Params: propertyPath – the property path to determine the type for
See Also: PropertyAccessor.getPropertyType(String)
Returns: the type of the property, or null if not determinable/**
	 * 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.
Params: propertyName – the property path to look for
requiredType – the type to look for
Returns: the custom editor, or null if none specific for this property/**
	 * 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 getAsText). 
Params: requiredType – the type to look for
See Also: PropertyEditor.getAsText()
Returns: the custom editor, or null if none found for this type/**
	 * 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 (Iterator<Class<?>> it = this.customEditors.keySet().iterator(); it.hasNext() && editor == null;) {
					Class<?> key = it.next();
					if (key.isAssignableFrom(requiredType)) {
						editor = this.customEditors.get(key);
						// 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);
					}
				}
			}
		}
		return editor;
	}

	Guess the property type of the specified property from the registered
custom editors (provided that they were registered for a specific type).
Params: propertyName – the name of the property
Returns: the property type, or null if not determinable/**
	 * 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.
Params: target – the target registry to copy to
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./**
	 * 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.
Params: strippedPaths – the result list to add to
nestedPath – the current nested path
propertyPath – the property path to check for keys/indexes to strip/**
	 * 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.
/**
	 * 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;
			}
		}
	}

}
Author:	Juergen Hoeller, Rob Harrop, Sebastien Deleuze
See Also:	PropertyEditorManager PropertyEditorSupport.setAsText PropertyEditorSupport.setValue
Since:	1.2.6
Params:	requiredType – the type of the property propertyEditor – the editor to register
See Also:	registerCustomEditor(Class<?>, PropertyEditor)
Params:	requiredType – type of the property
See Also:	registerDefaultEditors
Returns:	the default editor, or `null` if none found
Params:	elementType – the target type of the element (can be `null` if not known) propertyPath – the property path (typically of the array/collection; can be `null` if not known)
Returns:	whether a matching custom editor has been found
Params:	propertyPath – the property path to determine the type for
See Also:	PropertyAccessor.getPropertyType(String)
Returns:	the type of the property, or `null` if not determinable
Params:	propertyName – the property path to look for requiredType – the type to look for
Returns:	the custom editor, or `null` if none specific for this property
Params:	requiredType – the type to look for
See Also:	PropertyEditor.getAsText()
Returns:	the custom editor, or `null` if none found for this type
Params:	propertyName – the name of the property
Returns:	the property type, or `null` if not determinable
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org.springframework/ spring-beans/ 5.3.3/ org/springframework/beans/PropertyEditorRegistrySupport.java
