PropertyResolver (Java EE 5)

PropertyResolver 表示一种可插入的机制，用于访问底层 Java 对象实例的“属性”。不同的 PropertyResolver 实现可以支持不同 Java 类实例上的属性解析（如对 JavaBean 组件属性进行基于内省的访问，或者对 java.util.Map 实例调用 get() 和 put()）。

所有实现必须遵守为每个方法定义的 JavaBean 组件、java.util.Map、java.util.List 和数组实例的规则，但允许为其他类型添加自定义语义。

public abstract class PropertyResolver

extends Object

PropertyResolver represents a pluggable mechanism for accessing a "property" of an underlying Java object instance. Different PropertyResolver implementations can support property resolution on instances of different Java classes (such as introspection-based access to properties of a JavaBeans component, or get() and put() calls on a java.util.Map instance).

All implementations must respect the rules for JavaBeans component, java.util.Map, java.util.List and array instances defined for each method but are allowed to add custom semantics for other types.

public PropertyResolver()

英文文档：

PropertyResolver

public PropertyResolver()

Deprecated. 

abstract public Object getValue(Object base, Object property) throws EvaluationException, PropertyNotFoundException

返回指定 base 对象的指定属性的值。

对于 Bean base 的对象，属性将强制匹配为 String，并用作属性名称。对于所有其他 base 对象类型（例如 Map），使用该属性时没有任何强制匹配。

base	要返回其属性值的 base 对象
property	要返回的属性
return	属性值；如果 base 或 property 为 null，或者属性不存在且 base 对象为 Map 实例，则返回 null
Throws	EvaluationException: 如果获取属性值时抛出异常（抛出的异常必须作为此异常的 cause 属性包含在内）
Throws	PropertyNotFoundException: 如果 Bean base 对象的指定属性不存在或不可读

英文文档：

getValue

public abstract Object getValue(Object base,
                                Object property)
                         throws EvaluationException,
                                PropertyNotFoundException

Deprecated. 

Return the value of the specified property from the specified base object.

For a bean base object, the property is coerced to a String and used as the property name. For all other base object types (e.g., a Map), the property is used without any coercing.

Parameters:

base - The base object whose property value is to be returned

property - The property to be returned

Returns:

The property value, or null if base or property is null, or if the property doesn't exist and the base object is a Map instance

Throws:

EvaluationException - if an exception is thrown while getting the property value (the thrown exception must be included as the cause property of this exception)

PropertyNotFoundException - if the specified property for a bean base object does not exist or is not readable

abstract public Object getValue(Object base, int index) throws EvaluationException, PropertyNotFoundException

返回指定 base 对象的指定索引处的值。

base	要返回其属性值的 base 对象
index	要返回的值的索引
return	属性值；如果 base 为 null，或者索引超出 base 对象的边界，则为 null
Throws	EvaluationException: 如果获取属性值时抛出异常（抛出的异常必须作为此异常的 cause 属性包含在内）
Throws	PropertyNotFoundException: 如果索引超出边界，或者 base 为 null

英文文档：

getValue

public abstract Object getValue(Object base,
                                int index)
                         throws EvaluationException,
                                PropertyNotFoundException

Deprecated. 

Return the value at the specified index of the specified base object.

Parameters:

base - The base object whose property value is to be returned

index - The index of the value to return

Returns:

The property value, or null if base is null, or if the index is out of bounds for the base object

Throws:

EvaluationException - if an exception is thrown while getting the property value (the thrown exception must be included as the cause property of this exception)

PropertyNotFoundException - if the index is out of bounds or if base is null

abstract public void setValue(Object base, Object property, Object value) throws EvaluationException, PropertyNotFoundException

设置指定 base 对象上指定属性的指定值。

对于 Bean base 的对象，属性将强制匹配为 String，并用作属性名称。对于所有其他 base 对象类型（例如 Map），使用该属性时没有任何强制匹配。

base	要设置其属性值的 base 对象
property	要设置的属性
value	要设置的属性值
Throws	EvaluationException: 如果设置属性值期间抛出异常（抛出的异常必须作为此异常的 cause 属性包含在内）
Throws	PropertyNotFoundException: 如果指定的 Bean base 对象不存在或不可写，或者 base 或 name 为 null

英文文档：

setValue

public abstract void setValue(Object base,
                              Object property,
                              Object value)
                       throws EvaluationException,
                              PropertyNotFoundException

Deprecated. 

Set the specified value of the specified property on the specified base object.

For a bean base object, the property is coerced to a String and used as the property name. For all other base object types (e.g., a Map), the property is used without any coercing.

Parameters:

base - The base object whose property value is to be set

property - The property to be set

value - The value of the property to be set

Throws:

EvaluationException - if an exception is thrown while setting the property value (the thrown exception must be included as the cause property of this exception)

PropertyNotFoundException - if the specified bean base object property does not exist or is not writeable, or if base or name is null

abstract public void setValue(Object base, int index, Object value) throws EvaluationException, PropertyNotFoundException

设置指定 base 对象的指定索引处的值。

base	要设置其属性值的 base 对象
index	要设置的值的索引
value	要设置的值
Throws	EvaluationException: 如果设置属性值期间抛出异常（抛出的异常必须作为此异常的 cause 属性包含在内）
Throws	PropertyNotFoundException: 如果索引超出边界，或者 base 为 null

英文文档：

setValue

public abstract void setValue(Object base,
                              int index,
                              Object value)
                       throws EvaluationException,
                              PropertyNotFoundException

Deprecated. 

Set the value at the specified index of the specified base object.

Parameters:

base - The base object whose property value is to be set

index - The index of the value to set

value - The value to be set

Throws:

EvaluationException - if an exception is thrown while setting the property value (the thrown exception must be included as the cause property of this exception)

PropertyNotFoundException - if the index is out of bounds or if base is null

abstract public boolean isReadOnly(Object base, Object property) throws EvaluationException, PropertyNotFoundException

检查指定的属性是否为只读。

对于 Bean base 的对象，属性将强制匹配为 String，并用作属性名称。对于所有其他 base 对象类型（例如 Map），使用该属性时没有任何强制匹配。

base	要分析其属性的 base 对象
property	要分析的属性
return	如果已知指定 base 对象的指定属性不可变，则返回 true；否则返回 false
Throws	EvaluationException: 如果测试属性期间抛出异常（抛出的异常必须作为此异常的 cause 属性包含在内）
Throws	PropertyNotFoundException: 如果指定的 Bean base 对象不存在，或者 base 或 property 为 null

英文文档：

isReadOnly

public abstract boolean isReadOnly(Object base,
                                   Object property)
                            throws EvaluationException,
                                   PropertyNotFoundException

Deprecated. 

Checks if the specified property is read-only.

For a bean base object, the property is coerced to a String and used as the property name. For all other base object types (e.g., a Map), the property is used without any coercing.

Parameters:

base - The base object whose property is to be analyzed

property - The property to be analyzed

Returns:

true if the specified property of the specified base object is known to be immutable; otherwise false

Throws:

EvaluationException - if an exception is thrown while testing the property (the thrown exception must be included as the cause property of this exception)

PropertyNotFoundException - if the specified bean base object property does not exist or if base or property is null

abstract public boolean isReadOnly(Object base, int index) throws EvaluationException, PropertyNotFoundException

检查指定的索引是否为只读。

base	要分析其属性的 base 对象
index	要返回其类型的值的索引
return	如果已知指定 base 对象的指定索引处的值不可变，则返回 true；否则返回 false
Throws	EvaluationException: 如果测试属性期间抛出异常（抛出的异常必须作为此异常的 cause 属性包含在内）
Throws	PropertyNotFoundException: 如果索引超出边界，或者 base 为 null

英文文档：

isReadOnly

public abstract boolean isReadOnly(Object base,
                                   int index)
                            throws EvaluationException,
                                   PropertyNotFoundException

Deprecated. 

Checks if the specified index is read-only.

Parameters:

base - The base object whose property is to be analyzed

index - The index of the value whose type is to be returned

Returns:

true if the value at the specified index of the specified base object is known to be immutable; otherwise, false

Throws:

EvaluationException - if an exception is thrown while testing the property (the thrown exception must be included as the cause property of this exception)

PropertyNotFoundException - if the index is out of bounds or if base is null

abstract public Class<T> getType(Object base, Object property) throws EvaluationException, PropertyNotFoundException

返回表示指定属性类型的 java.lang.Class。只要属性不是只读的，就可以将该类型的任何对象的实例设置为该属性的值。保证属性的实际值（如果不为 null）是此类型的实例或者此类型子类的实例。对于发现可以设置为该属性的值的对象类型，此方法也非常有用。

对于 Bean base 的对象，属性将强制匹配为 String，并用作属性名称。对于所有其他 base 对象类型（例如 Map），使用该属性时没有任何强制匹配。

base	要分析其属性的 base 对象
property	要分析的属性
return	java.lang.Class（如果可以确定），它表示指定 base 对象的指定属性的类型；否则返回 null
Throws	EvaluationException: 如果测试属性期间抛出异常（抛出的异常必须作为此异常的 cause 属性包含在内）
Throws	PropertyNotFoundException: 如果指定的 Bean base 对象不存在，或者 base 或 property 为 null

英文文档：

getType

public abstract Class getType(Object base,
                              Object property)
                       throws EvaluationException,
                              PropertyNotFoundException

Deprecated. 

Return the java.lang.Class representing the type of the specified property. An instance of any Object of that type my be set as the value of that property, as long as the property is not read-only. The actual value of the property, if non-null, is guaranteed to be an instance of this type, or an instance of a subclass of this type. This method is also useful for discovering the type of Objects that may be set as the value of the property.

For a bean base object, the property is coerced to a String and used as the property name. For all other base object types (e.g., a Map), the property is used without any coercing.

Parameters:

base - The base object whose property is to be analyzed

property - The property to be analyzed

Returns:

the java.lang.Class representing the type of the specified property of the specified base object, if it can be determined; otherwise null

Throws:

EvaluationException - if an exception is thrown while testing the property (the thrown exception must be included as the cause property of this exception)

PropertyNotFoundException - if the specified bean base object property does not exist or if base or property is null

abstract public Class<T> getType(Object base, int index) throws EvaluationException, PropertyNotFoundException

返回表示指定索引类型的 java.lang.Class。

base	要分析其属性的 base 对象
index	要返回其类型的值的索引
return	java.lang.Class（如果可以确定），它表示指定 base 对象指定索引处的值的类型；否则返回 null
Throws	EvaluationException: 如果测试属性期间抛出异常（抛出的异常必须作为此异常的 cause 属性包含在内）
Throws	PropertyNotFoundException: 如果索引超出边界，或者 base 为 null

英文文档：

getType

public abstract Class getType(Object base,
                              int index)
                       throws EvaluationException,
                              PropertyNotFoundException

Deprecated. 

Return the java.lang.Class representing the type of the specified index.

Parameters:

base - The base object whose property is to be analyzed

index - The index of the value whose type is to be returned

Returns:

The java.lang.Class representing the type of value at the specified index of the specified base object, if it can be determined; otherwise null

Throws:

EvaluationException - if an exception is thrown while testing the property (the thrown exception must be included as the cause property of this exception)

PropertyNotFoundException - if the index is out of bounds or if base is null

Copyright 2007 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.