com.opensymphony.xwork2.ognl

## Class OgnlUtil

- java.lang.Object
- - com.opensymphony.xwork2.ognl.OgnlUtil

-     public class OgnlUtil
      extends Object

  Utility class that provides common access to the Ognl APIs for setting and getting properties from objects (usually Actions).
  Author:
    Jason Carreira

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `OgnlUtil()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected void` | `applyExpressionMaxLength(String maxLength)`
    `int` | `beanInfoCacheSize()` Check the size of the BeanInfo cache (current number of elements).
    `Object` | `callMethod(String name, Map<String,Object> context, Object root)`
    `void` | `clearBeanInfoCache()` Provide a mechanism to clear the BeanInfo cache.
    `void` | `clearExpressionCache()` Provide a mechanism to clear the OGNL expression cache.
    `static void` | `clearRuntimeCache()` Convenience mechanism to clear the OGNL Runtime Cache via OgnlUtil.
    `Object` | `compile(String expression)`
    `Object` | `compile(String expression, Map<String,Object> context)`
    `void` | `copy(Object from, Object to, Map<String,Object> context)` Copies the properties in the object "from" and sets them in the object "to" using specified type converter, or `XWorkConverter` if none is specified.
    `void` | `copy(Object from, Object to, Map<String,Object> context, Collection<String> exclusions, Collection<String> inclusions)` Copies the properties in the object "from" and sets them in the object "to" using specified type converter, or `XWorkConverter` if none is specified.
    `void` | `copy(Object from, Object to, Map<String,Object> context, Collection<String> exclusions, Collection<String> inclusions, Class<?> editable)` Copies the properties in the object "from" and sets them in the object "to" only setting properties defined in the given "editable" class (or interface) using specified type converter, or `XWorkConverter` if none is specified.
    `protected Map` | `createDefaultContext(Object root)`
    `protected Map` | `createDefaultContext(Object root, ognl.ClassResolver classResolver)`
    `int` | `expressionCacheSize()` Check the size of the expression cache (current number of elements).
    `BeanInfo` | `getBeanInfo(Class clazz)` Get's the java bean info for the given source.
    `BeanInfo` | `getBeanInfo(Object from)` Get's the java bean info for the given source object.
    `Map<String,Object>` | `getBeanMap(Object source)` Creates a Map with read properties for the given source object.
    `Set<Class<?>>` | `getExcludedClasses()`
    `Set<Pattern>` | `getExcludedPackageNamePatterns()`
    `Set<String>` | `getExcludedPackageNames()`
    `PropertyDescriptor[]` | `getPropertyDescriptors(Class clazz)` Get's the java beans property descriptors for the given class.
    `PropertyDescriptor[]` | `getPropertyDescriptors(Object source)` Get's the java beans property descriptors for the given source.
    `Object` | `getRealTarget(String property, Map<String,Object> context, Object root)` Looks for the real target with the specified property given a root Object which may be a CompoundRoot.
    `Object` | `getValue(String name, Map<String,Object> context, Object root)`
    `Object` | `getValue(String name, Map<String,Object> context, Object root, Class resultType)`
    `boolean` | `isDisallowProxyMemberAccess()`
    `protected void` | `setAllowStaticMethodAccess(String allowStaticMethodAccess)`
    `protected void` | `setContainer(Container container)`
    `protected void` | `setDevMode(String mode)`
    `protected void` | `setDisallowProxyMemberAccess(String disallowProxyMemberAccess)`
    `protected void` | `setEnableEvalExpression(String evalExpression)`
    `protected void` | `setEnableExpressionCache(String cache)`
    `protected void` | `setExcludedClasses(String commaDelimitedClasses)`
    `protected void` | `setExcludedPackageNamePatterns(String commaDelimitedPackagePatterns)`
    `protected void` | `setExcludedPackageNames(String commaDelimitedPackageNames)`
    `void` | `setProperties(Map<String,?> properties, Object o)` Sets the properties on the object using the default context, defaulting to not throwing exceptions for problems setting the properties.
    `void` | `setProperties(Map<String,?> properties, Object o, boolean throwPropertyExceptions)` Sets the properties on the object using the default context.
    `void` | `setProperties(Map<String,?> props, Object o, Map<String,Object> context)` Sets the object's properties using the default type converter, defaulting to not throw exceptions for problems setting the properties.
    `void` | `setProperties(Map<String,?> props, Object o, Map<String,Object> context, boolean throwPropertyExceptions)` Sets the object's properties using the default type converter.
    `void` | `setProperty(String name, Object value, Object o, Map<String,Object> context)` Sets the named property to the supplied value on the Object, defaults to not throwing property exceptions.
    `void` | `setProperty(String name, Object value, Object o, Map<String,Object> context, boolean throwPropertyExceptions)` Sets the named property to the supplied value on the Object.
    `void` | `setValue(String name, Map<String,Object> context, Object root, Object value)` Wrapper around Ognl.setValue() to handle type conversion for collection elements.
    `protected void` | `setXWorkConverter(XWorkConverter conv)`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### OgnlUtil

          public OgnlUtil()

  - ### Method Detail

    - #### setXWorkConverter

          protected void setXWorkConverter(XWorkConverter conv)

    - #### setDevMode

          protected void setDevMode(String mode)

    - #### setEnableExpressionCache

          protected void setEnableExpressionCache(String cache)

    - #### setEnableEvalExpression

          protected void setEnableEvalExpression(String evalExpression)

    - #### setExcludedClasses

          protected void setExcludedClasses(String commaDelimitedClasses)

    - #### setExcludedPackageNamePatterns

          protected void setExcludedPackageNamePatterns(String commaDelimitedPackagePatterns)

    - #### setExcludedPackageNames

          protected void setExcludedPackageNames(String commaDelimitedPackageNames)

    - #### getExcludedClasses

          public Set<Class<?>> getExcludedClasses()

    - #### getExcludedPackageNamePatterns

          public Set<Pattern> getExcludedPackageNamePatterns()

    - #### getExcludedPackageNames

          public Set<String> getExcludedPackageNames()

    - #### setContainer

          protected void setContainer(Container container)

    - #### setAllowStaticMethodAccess

          protected void setAllowStaticMethodAccess(String allowStaticMethodAccess)

    - #### setDisallowProxyMemberAccess

          protected void setDisallowProxyMemberAccess(String disallowProxyMemberAccess)

    - #### applyExpressionMaxLength

          protected void applyExpressionMaxLength(String maxLength)

      Parameters:
        `maxLength` - Injects the Struts OGNL maximum expression length.

    - #### isDisallowProxyMemberAccess

          public boolean isDisallowProxyMemberAccess()

    - #### clearRuntimeCache

          public static void clearRuntimeCache()

      Convenience mechanism to clear the OGNL Runtime Cache via OgnlUtil. May be utilized by applications that generate many unique OGNL expressions over time. Note: This call affects the global OGNL cache, see (`OgnlRuntime.clearCache()` for details. Warning: Frequent calling if this method may negatively impact performance, but may be required to avoid memory exhaustion (resource leak) with too many OGNL expressions being cached.
      Since:
        2.5.21

    - #### clearExpressionCache

          public void clearExpressionCache()

      Provide a mechanism to clear the OGNL expression cache. May be utilized by applications that generate many unique OGNL expressions over time. Note: This call affects the current OgnlUtil instance. For Struts this is often a Singleton instance so it can be "effectively global". Warning: Frequent calling if this method may negatively impact performance, but may be required to avoid memory exhaustion (resource leak) with too many OGNL expressions being cached.
      Since:
        2.5.21

    - #### expressionCacheSize

          public int expressionCacheSize()

      Check the size of the expression cache (current number of elements).
      Returns:
        current number of elements in the expression cache.
      Since:
        2.5.21

    - #### clearBeanInfoCache

          public void clearBeanInfoCache()

      Provide a mechanism to clear the BeanInfo cache. May be utilized by applications that request BeanInfo and/or PropertyDescriptors for many unique classes or objects over time (especially dynamic objects). Note: This call affects the current OgnlUtil instance. For Struts this is often a Singleton instance so it can be "effectively global". Warning: Frequent calling if this method may negatively impact performance, but may be required to avoid memory exhaustion (resource leak) with too many BeanInfo elements being cached.
      Since:
        2.5.21

    - #### beanInfoCacheSize

          public int beanInfoCacheSize()

      Check the size of the BeanInfo cache (current number of elements).
      Returns:
        current number of elements in the BeanInfo cache.
      Since:
        2.5.21

    - #### setProperties

          public void setProperties(Map<String,?> props,
                           Object o,
                           Map<String,Object> context)

      Sets the object's properties using the default type converter, defaulting to not throw exceptions for problems setting the properties.
      Parameters:
        `props` - the properties being set
        `o` - the object
        `context` - the action context

    - #### setProperties

          public void setProperties(Map<String,?> props,
                           Object o,
                           Map<String,Object> context,
                           boolean throwPropertyExceptions)
                             throws ReflectionException

      Sets the object's properties using the default type converter.
      Parameters:
        `props` - the properties being set
        `o` - the object
        `context` - the action context
        `throwPropertyExceptions` - boolean which tells whether it should throw exceptions for problems setting the properties
      Throws:
        `ReflectionException`

    - #### setProperties

          public void setProperties(Map<String,?> properties,
                           Object o)

      Sets the properties on the object using the default context, defaulting to not throwing exceptions for problems setting the properties.
      Parameters:
        `properties` - map of properties
        `o` - object

    - #### setProperties

          public void setProperties(Map<String,?> properties,
                           Object o,
                           boolean throwPropertyExceptions)

      Sets the properties on the object using the default context.
      Parameters:
        `properties` - the property map to set on the object
        `o` - the object to set the properties into
        `throwPropertyExceptions` - boolean which tells whether it should throw exceptions for problems setting the properties

    - #### setProperty

          public void setProperty(String name,
                         Object value,
                         Object o,
                         Map<String,Object> context)

      Sets the named property to the supplied value on the Object, defaults to not throwing property exceptions.
      Parameters:
        `name` - the name of the property to be set
        `value` - the value to set into the named property
        `o` - the object upon which to set the property
        `context` - the context which may include the TypeConverter

    - #### setProperty

          public void setProperty(String name,
                         Object value,
                         Object o,
                         Map<String,Object> context,
                         boolean throwPropertyExceptions)

      Sets the named property to the supplied value on the Object.
      Parameters:
        `name` - the name of the property to be set
        `value` - the value to set into the named property
        `o` - the object upon which to set the property
        `context` - the context which may include the TypeConverter
        `throwPropertyExceptions` - boolean which tells whether it should throw exceptions for problems setting the property

    - #### getRealTarget

          public Object getRealTarget(String property,
                             Map<String,Object> context,
                             Object root)
                               throws ognl.OgnlException

      Looks for the real target with the specified property given a root Object which may be a CompoundRoot.
      Parameters:
        `property` - the property
        `context` - context map
        `root` - compound root
      Returns:
        the real target or null if no object can be found with the specified property
      Throws:
        `ognl.OgnlException` - in case of ognl errors

    - #### setValue

          public void setValue(String name,
                      Map<String,Object> context,
                      Object root,
                      Object value)
                        throws ognl.OgnlException

      Wrapper around Ognl.setValue() to handle type conversion for collection elements. Ideally, this should be handled by OGNL directly.
      Parameters:
        `name` - the name
        `context` - context map
        `root` - root
        `value` - value
      Throws:
        `ognl.OgnlException` - in case of ognl errors

    - #### getValue

          public Object getValue(String name,
                        Map<String,Object> context,
                        Object root)
                          throws ognl.OgnlException

      Throws:
        `ognl.OgnlException`

    - #### callMethod

          public Object callMethod(String name,
                          Map<String,Object> context,
                          Object root)
                            throws ognl.OgnlException

      Throws:
        `ognl.OgnlException`

    - #### getValue

          public Object getValue(String name,
                        Map<String,Object> context,
                        Object root,
                        Class resultType)
                          throws ognl.OgnlException

      Throws:
        `ognl.OgnlException`

    - #### compile

          public Object compile(String expression)
                         throws ognl.OgnlException

      Throws:
        `ognl.OgnlException`

    - #### compile

          public Object compile(String expression,
                       Map<String,Object> context)
                         throws ognl.OgnlException

      Throws:
        `ognl.OgnlException`

    - #### copy

          public void copy(Object from,
                  Object to,
                  Map<String,Object> context,
                  Collection<String> exclusions,
                  Collection<String> inclusions)

      Copies the properties in the object "from" and sets them in the object "to" using specified type converter, or `XWorkConverter` if none is specified.
      Parameters:
        `from` - the source object
        `to` - the target object
        `context` - the action context we're running under
        `exclusions` - collection of method names to excluded from copying ( can be null)
        `inclusions` - collection of method names to included copying (can be null) note if exclusions AND inclusions are supplied and not null nothing will get copied.

    - #### copy

          public void copy(Object from,
                  Object to,
                  Map<String,Object> context,
                  Collection<String> exclusions,
                  Collection<String> inclusions,
                  Class<?> editable)

      Copies the properties in the object "from" and sets them in the object "to" only setting properties defined in the given "editable" class (or interface) using specified type converter, or `XWorkConverter` if none is specified.
      Parameters:
        `from` - the source object
        `to` - the target object
        `context` - the action context we're running under
        `exclusions` - collection of method names to excluded from copying ( can be null)
        `inclusions` - collection of method names to included copying (can be null) note if exclusions AND inclusions are supplied and not null nothing will get copied.
        `editable` - the class (or interface) to restrict property setting to

    - #### copy

          public void copy(Object from,
                  Object to,
                  Map<String,Object> context)

      Copies the properties in the object "from" and sets them in the object "to" using specified type converter, or `XWorkConverter` if none is specified.
      Parameters:
        `from` - the source object
        `to` - the target object
        `context` - the action context we're running under

    - #### getPropertyDescriptors

          public PropertyDescriptor[] getPropertyDescriptors(Object source)
                                                      throws IntrospectionException

      Get's the java beans property descriptors for the given source.
      Parameters:
        `source` - the source object.
      Returns:
        property descriptors.
      Throws:
        `IntrospectionException` - is thrown if an exception occurs during introspection.

    - #### getPropertyDescriptors

          public PropertyDescriptor[] getPropertyDescriptors(Class clazz)
                                                      throws IntrospectionException

      Get's the java beans property descriptors for the given class.
      Parameters:
        `clazz` - the source object.
      Returns:
        property descriptors.
      Throws:
        `IntrospectionException` - is thrown if an exception occurs during introspection.

    - #### getBeanMap

          public Map<String,Object> getBeanMap(Object source)
                                        throws IntrospectionException,
                                               ognl.OgnlException

      Creates a Map with read properties for the given source object.

      If the source object does not have a read property (i.e. write-only) then the property is added to the map with the value `here is no read method for property-name`.

      Parameters:
        `source` - the source object.
      Returns:
        a Map with (key = read property name, value = value of read property).
      Throws:
        `IntrospectionException` - is thrown if an exception occurs during introspection.
        `ognl.OgnlException` - is thrown by OGNL if the property value could not be retrieved

    - #### getBeanInfo

          public BeanInfo getBeanInfo(Object from)
                               throws IntrospectionException

      Get's the java bean info for the given source object. Calls getBeanInfo(Class c).
      Parameters:
        `from` - the source object.
      Returns:
        java bean info.
      Throws:
        `IntrospectionException` - is thrown if an exception occurs during introspection.

    - #### getBeanInfo

          public BeanInfo getBeanInfo(Class clazz)
                               throws IntrospectionException

      Get's the java bean info for the given source.
      Parameters:
        `clazz` - the source class.
      Returns:
        java bean info.
      Throws:
        `IntrospectionException` - is thrown if an exception occurs during introspection.

    - #### createDefaultContext

          protected Map createDefaultContext(Object root)

    - #### createDefaultContext

          protected Map createDefaultContext(Object root,
                                 ognl.ClassResolver classResolver)

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