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/*
* Copyright 2002-2018 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.util.Map;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.lang.Nullable;
/**
* Common interface for classes that can access named properties
* (such as bean properties of an object or fields in an object)
* Serves as base interface for {@link BeanWrapper}.
*
* @author Juergen Hoeller
* @since 1.1
* @see BeanWrapper
* @see PropertyAccessorFactory#forBeanPropertyAccess
* @see PropertyAccessorFactory#forDirectFieldAccess
*/
public interface PropertyAccessor {
/**
* Path separator for nested properties.
* Follows normal Java conventions: getFoo().getBar() would be "foo.bar".
*/
String NESTED_PROPERTY_SEPARATOR = ".";
/**
* Path separator for nested properties.
* Follows normal Java conventions: getFoo().getBar() would be "foo.bar".
*/
char NESTED_PROPERTY_SEPARATOR_CHAR = '.';
/**
* Marker that indicates the start of a property key for an
* indexed or mapped property like "person.addresses[0]".
*/
String PROPERTY_KEY_PREFIX = "[";
/**
* Marker that indicates the start of a property key for an
* indexed or mapped property like "person.addresses[0]".
*/
char PROPERTY_KEY_PREFIX_CHAR = '[';
/**
* Marker that indicates the end of a property key for an
* indexed or mapped property like "person.addresses[0]".
*/
String PROPERTY_KEY_SUFFIX = "]";
/**
* Marker that indicates the end of a property key for an
* indexed or mapped property like "person.addresses[0]".
*/
char PROPERTY_KEY_SUFFIX_CHAR = ']';
/**
* Determine whether the specified property is readable.
* Returns {@code false} if the property doesn't exist.
* @param propertyName the property to check
* (may be a nested path and/or an indexed/mapped property)
* @return whether the property is readable
*/
boolean isReadableProperty(String propertyName);
/**
* Determine whether the specified property is writable.
*
Returns {@code false} if the property doesn't exist.
* @param propertyName the property to check
* (may be a nested path and/or an indexed/mapped property)
* @return whether the property is writable
*/
boolean isWritableProperty(String propertyName);
/**
* Determine the property type for the specified property,
* either checking the property descriptor or checking the value
* in case of an indexed or mapped element.
* @param propertyName the property to check
* (may be a nested path and/or an indexed/mapped property)
* @return the property type for the particular property,
* or {@code null} if not determinable
* @throws PropertyAccessException if the property was valid but the
* accessor method failed
*/
@Nullable
Class getPropertyType(String propertyName) throws BeansException;
/**
* Return a type descriptor for the specified property:
* preferably from the read method, falling back to the write method.
* @param propertyName the property to check
* (may be a nested path and/or an indexed/mapped property)
* @return the property type for the particular property,
* or {@code null} if not determinable
* @throws PropertyAccessException if the property was valid but the
* accessor method failed
*/
@Nullable
TypeDescriptor getPropertyTypeDescriptor(String propertyName) throws BeansException;
/**
* Get the current value of the specified property.
* @param propertyName the name of the property to get the value of
* (may be a nested path and/or an indexed/mapped property)
* @return the value of the property
* @throws InvalidPropertyException if there is no such property or
* if the property isn't readable
* @throws PropertyAccessException if the property was valid but the
* accessor method failed
*/
@Nullable
Object getPropertyValue(String propertyName) throws BeansException;
/**
* Set the specified value as current property value.
* @param propertyName the name of the property to set the value of
* (may be a nested path and/or an indexed/mapped property)
* @param value the new value
* @throws InvalidPropertyException if there is no such property or
* if the property isn't writable
* @throws PropertyAccessException if the property was valid but the
* accessor method failed or a type mismatch occurred
*/
void setPropertyValue(String propertyName, @Nullable Object value) throws BeansException;
/**
* Set the specified value as current property value.
* @param pv an object containing the new property value
* @throws InvalidPropertyException if there is no such property or
* if the property isn't writable
* @throws PropertyAccessException if the property was valid but the
* accessor method failed or a type mismatch occurred
*/
void setPropertyValue(PropertyValue pv) throws BeansException;
/**
* Perform a batch update from a Map.
*
Bulk updates from PropertyValues are more powerful: This method is
* provided for convenience. Behavior will be identical to that of
* the {@link #setPropertyValues(PropertyValues)} method.
* @param map a Map to take properties from. Contains property value objects,
* keyed by property name
* @throws InvalidPropertyException if there is no such property or
* if the property isn't writable
* @throws PropertyBatchUpdateException if one or more PropertyAccessExceptions
* occurred for specific properties during the batch update. This exception bundles
* all individual PropertyAccessExceptions. All other properties will have been
* successfully updated.
*/
void setPropertyValues(Map map) throws BeansException;
/**
* The preferred way to perform a batch update.
*
Note that performing a batch update differs from performing a single update,
* in that an implementation of this class will continue to update properties
* if a recoverable error (such as a type mismatch, but not an
* invalid field name or the like) is encountered, throwing a
* {@link PropertyBatchUpdateException} containing all the individual errors.
* This exception can be examined later to see all binding errors.
* Properties that were successfully updated remain changed.
*
Does not allow unknown fields or invalid fields.
* @param pvs a PropertyValues to set on the target object
* @throws InvalidPropertyException if there is no such property or
* if the property isn't writable
* @throws PropertyBatchUpdateException if one or more PropertyAccessExceptions
* occurred for specific properties during the batch update. This exception bundles
* all individual PropertyAccessExceptions. All other properties will have been
* successfully updated.
* @see #setPropertyValues(PropertyValues, boolean, boolean)
*/
void setPropertyValues(PropertyValues pvs) throws BeansException;
/**
* Perform a batch update with more control over behavior.
*
Note that performing a batch update differs from performing a single update,
* in that an implementation of this class will continue to update properties
* if a recoverable error (such as a type mismatch, but not an
* invalid field name or the like) is encountered, throwing a
* {@link PropertyBatchUpdateException} containing all the individual errors.
* This exception can be examined later to see all binding errors.
* Properties that were successfully updated remain changed.
* @param pvs a PropertyValues to set on the target object
* @param ignoreUnknown should we ignore unknown properties (not found in the bean)
* @throws InvalidPropertyException if there is no such property or
* if the property isn't writable
* @throws PropertyBatchUpdateException if one or more PropertyAccessExceptions
* occurred for specific properties during the batch update. This exception bundles
* all individual PropertyAccessExceptions. All other properties will have been
* successfully updated.
* @see #setPropertyValues(PropertyValues, boolean, boolean)
*/
void setPropertyValues(PropertyValues pvs, boolean ignoreUnknown)
throws BeansException;
/**
* Perform a batch update with full control over behavior.
*
Note that performing a batch update differs from performing a single update,
* in that an implementation of this class will continue to update properties
* if a recoverable error (such as a type mismatch, but not an
* invalid field name or the like) is encountered, throwing a
* {@link PropertyBatchUpdateException} containing all the individual errors.
* This exception can be examined later to see all binding errors.
* Properties that were successfully updated remain changed.
* @param pvs a PropertyValues to set on the target object
* @param ignoreUnknown should we ignore unknown properties (not found in the bean)
* @param ignoreInvalid should we ignore invalid properties (found but not accessible)
* @throws InvalidPropertyException if there is no such property or
* if the property isn't writable
* @throws PropertyBatchUpdateException if one or more PropertyAccessExceptions
* occurred for specific properties during the batch update. This exception bundles
* all individual PropertyAccessExceptions. All other properties will have been
* successfully updated.
*/
void setPropertyValues(PropertyValues pvs, boolean ignoreUnknown, boolean ignoreInvalid)
throws BeansException;
}