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Oracle Fusion Middleware Java API Reference for Oracle ADF Mobile 11g Release 2 (11.1.2.4.0) E27204-03 |
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java.lang.Object
javax.el.ELResolver
javax.el.MapELResolver
public class MapELResolver
Defines property resolution behavior on instances of java.util.Map. This resolver handles base objects of type java.util.Map. It accepts any object as a property and uses that object as a key in the map. The resulting value is the value in the map that is associated with that key. This resolver can be constructed in read-only mode, which means that isReadOnly will always return true and setValue(ELContext, Object, Object, Object)
will always throw PropertyNotWritableException. ELResolvers are combined together using CompositeELResolver
s, to define rich semantics for evaluating an expression. See the javadocs for ELResolver
for details.
Field Summary |
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Fields inherited from class javax.el.ELResolver |
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RESOLVABLE_AT_DESIGN_TIME, TYPE |
Constructor Summary | |
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MapELResolver() Creates a new read/write MapELResolver. |
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MapELResolver(boolean readOnly) Creates a new MapELResolver whose read-only status is determined by the given parameter. |
Method Summary | |
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java.lang.Class |
getCommonPropertyType(ELContext context, java.lang.Object base) If the base object is a map, returns the most general type that this resolver accepts for the property argument. |
java.lang.Class |
getType(ELContext context, java.lang.Object base, java.lang.Object property) If the base object is a map, returns the most general acceptable type for a value in this map. |
java.lang.Object |
getValue(ELContext context, java.lang.Object base, java.lang.Object property) If the base object is a map, returns the value associated with the given key, as specified by the property argument. |
boolean |
isReadOnly(ELContext context, java.lang.Object base, java.lang.Object property) If the base object is a map, returns whether a call to setValue(ELContext, Object, Object, Object) will always fail. |
void |
setValue(ELContext context, java.lang.Object base, java.lang.Object property, java.lang.Object value) If the base object is a map, attempts to set the value associated with the given key, as specified by the property argument. |
Methods inherited from class javax.el.ELResolver |
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invoke |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public MapELResolver()
public MapELResolver(boolean readOnly)
Method Detail |
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public java.lang.Class getCommonPropertyType(ELContext context, java.lang.Object base)
getCommonPropertyType
in class ELResolver
context
- The context of this evaluation.base
- The map to analyze. Only bases of type Map are handled by this resolver.public java.lang.Class getType(ELContext context, java.lang.Object base, java.lang.Object property)
getType
in class ELResolver
context
- The context of this evaluation.base
- The map to analyze. Only bases of type Map are handled by this resolver.property
- The key to return the acceptable type for. Ignored by this resolver.java.lang.NullPointerException
- if context is nullELException
- if an exception was thrown while performing the property or variable resolution. The thrown exception must be included as the cause property of this exception, if available.public java.lang.Object getValue(ELContext context, java.lang.Object base, java.lang.Object property)
getValue
in class ELResolver
context
- The context of this evaluation.base
- The map to analyze. Only bases of type Map are handled by this resolver.property
- The key to return the acceptable type for. Ignored by this resolver.java.lang.ClassCastException
- if the key is of an inappropriate type for this map (optionally thrown by the underlying Map).java.lang.NullPointerException
- if context is null, or if the key is null and this map does not permit null keys (the latter is optionally thrown by the underlying Map).ELException
- if an exception was thrown while performing the property or variable resolution. The thrown exception must be included as the cause property of this exception, if available.public boolean isReadOnly(ELContext context, java.lang.Object base, java.lang.Object property)
setValue(ELContext, Object, Object, Object)
will always fail. If the base is a Map, the propertyResolved property of the ELContext object must be set to true by this resolver, before returning. If this property is not true after this method is called, the caller should ignore the return value. If this resolver was constructed in read-only mode, this method will always return true. If a Map was created using java.util.Collections.unmodifiableMap(Map), this method must return true. Unfortunately, there is no Collections API method to detect this. However, an implementation can create a prototype unmodifiable Map and query its runtime type to see if it matches the runtime type of the base object as a workaround.isReadOnly
in class ELResolver
context
- The context of this evaluation.base
- The map to analyze. Only bases of type Map are handled by this resolver.property
- The key to return the acceptable type for. Ignored by this resolver.java.lang.NullPointerException
- if context is null.ELException
- if an exception was thrown while performing the property or variable resolution. The thrown exception must be included as the cause property of this exception, if available.public void setValue(ELContext context, java.lang.Object base, java.lang.Object property, java.lang.Object value)
setValue
in class ELResolver
context
- The context of this evaluation.base
- The map to analyze. Only bases of type Map are handled by this resolver.property
- The key to return the acceptable type for. Ignored by this resolver.value
- The value to be associated with the specified key.java.lang.ClassCastException
- if the class of the specified key or value prevents it from being stored in this map.java.lang.NullPointerException
- if context is null, or if this map does not permit null keys or values, and the specified key or value is null.java.lang.IllegalArgumentException
- if some aspect of this key or value prevents it from being stored in this map.PropertyNotWritableException
- if this resolver was constructed in read-only mode, or if the put operation is not supported by the underlying map.ELException
- if an exception was thrown while performing the property or variable resolution. The thrown exception must be included as the cause property of this exception, if available.
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Oracle Fusion Middleware Java API Reference for Oracle ADF Mobile 11g Release 2 (11.1.2.4.0) E27204-03 |
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