javax.faces.el.PropertyResolver Maven / Gradle / Ivy
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/*
* $Id: PropertyResolver.java,v 1.15 2007/04/27 22:00:08 ofung Exp $
*/
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package javax.faces.el;
/**
* PropertyResolver represents a pluggable mechanism
* for accessing a "property" of an underlying Java object instance.
* Different {@link 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.
*
* @deprecated This has been replaced by {@link javax.el.ELResolver}.
*/
public abstract class PropertyResolver {
/**
* 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.
*
* @param base The base object whose property value is to be returned
* @param property The property to be returned
* @return 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)
* @throws PropertyNotFoundException if the specified property
* for a bean base object does not exist or is not readable
*/
public abstract Object getValue(Object base, Object property)
throws EvaluationException, PropertyNotFoundException;
/**
* Return the value at the specified index of the specified
* base object.
*
* @param base The base object whose property value is to be returned
* @param index The index of the value to return
* @return 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)
* @throws PropertyNotFoundException if the index is out of
* bounds or if base is null
*/
public abstract Object getValue(Object base, int index)
throws EvaluationException, PropertyNotFoundException;
/**
* 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.
*
* @param base The base object whose property value is to be set
* @param property The property to be set
* @param 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)
* @throws PropertyNotFoundException if the specified bean base
* object property does not exist or is not writeable, or if
* base or name is null
*/
public abstract void setValue(Object base, Object property, Object value)
throws EvaluationException, PropertyNotFoundException;
/**
* Set the value at the specified index of the specified
* base object.
*
* @param base The base object whose property value is to be set
* @param index The index of the value to set
* @param 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)
* @throws PropertyNotFoundException if the index is out of
* bounds or if base is null
*/
public abstract void setValue(Object base, int index, Object value)
throws EvaluationException, PropertyNotFoundException;
/**
* 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.
*
* @param base The base object whose property is to be analyzed
* @param property The property to be analyzed
* @return 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)
* @throws PropertyNotFoundException if the specified bean base
* object property does not exist or if base or
* property is null
*/
public abstract boolean isReadOnly(Object base, Object property)
throws EvaluationException, PropertyNotFoundException;
/**
* Checks if the specified index is read-only.
*
* @param base The base object whose property is to be analyzed
* @param index The index of the value whose type is to be returned
* @return 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)
* @throws PropertyNotFoundException if the index is out of
* bounds or if base is null
*/
public abstract boolean isReadOnly(Object base, int index)
throws EvaluationException, PropertyNotFoundException;
/**
* 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.
*
* @param base The base object whose property is to be analyzed
* @param property The property to be analyzed
* @return 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)
* @throws PropertyNotFoundException if the specified bean base
* object property does not exist or if base or
* property is null
*/
public abstract Class getType(Object base, Object property)
throws EvaluationException, PropertyNotFoundException;
/**
* Return the java.lang.Class representing the type of
* the specified index.
*
* @param base The base object whose property is to be analyzed
* @param index The index of the value whose type is to be returned
* @return 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)
* @throws PropertyNotFoundException if the index is out of
* bounds or if base is null
*/
public abstract Class getType(Object base, int index)
throws EvaluationException, PropertyNotFoundException;
}