Package de.odysseus.el

Class ExpressionFactoryImpl

  • public class ExpressionFactoryImpl
extends javax.el.ExpressionFactory
    Expression factory implementation. This class is also used as an EL "service provider". The juel-spi jar file specifies this class as el expression factory implementation in META-INF/services/javax.el.ExpressionFactory. Calling ExpressionFactory.newInstance() will then return an instance of this class, configured as described below. If no properties are specified at construction time, properties are read from
    1. If the file JAVA_HOME/lib/el.properties exists and if it contains property javax.el.ExpressionFactory whose value is the name of this class, these properties are taken as default properties.
    2. Otherwise, if system property javax.el.ExpressionFactory is set to the name of this class, the system properties System.getProperties() are taken as default properties.
    3. el.properties on your classpath. These properties override the properties from JAVA_HOME/lib/el.properties or System.getProperties().
    There are also constructors to explicitly pass in an instance of Properties. Having this, the following properties are read:
    • javax.el.cacheSize - cache size (int, default is 1000)
    • javax.el.methodInvocations - allow method invocations as in ${foo.bar(baz)} (boolean, default is false).
    • javax.el.nullProperties - resolve null properties as in ${foo[null]} (boolean, default is false).
    • javax.el.varArgs - support function/method calls using varargs (boolean, default is false).

    • Field Detail

      • PROP_METHOD_INVOCATIONS

        public static final java.lang.String PROP_METHOD_INVOCATIONS
        javax.el.methodInvocations
        See Also:
        Constant Field Values

      • PROP_VAR_ARGS

        public static final java.lang.String PROP_VAR_ARGS
        javax.el.varArgs
        See Also:
        Constant Field Values

      • PROP_NULL_PROPERTIES

        public static final java.lang.String PROP_NULL_PROPERTIES
        javax.el.nullProperties
        See Also:
        Constant Field Values

      • PROP_IGNORE_RETURN_TYPE

        public static final java.lang.String PROP_IGNORE_RETURN_TYPE
        javax.el.ignoreReturnType
        See Also:
        Constant Field Values

      • PROP_CACHE_SIZE

        public static final java.lang.String PROP_CACHE_SIZE
        javax.el.cacheSize
        See Also:
        Constant Field Values

    • Constructor Detail

      • ExpressionFactoryImpl

        public ExpressionFactoryImpl()
        Create a new expression factory using the default builder and cache implementations. The builder and cache are configured from el.properties (see above). The maximum cache size will be 1000 unless overridden in el.properties. The builder profile is ExpressionFactoryImpl.Profile.JEE6 (features may be overridden in el.properties).

      • ExpressionFactoryImpl

        public ExpressionFactoryImpl​(ExpressionFactoryImpl.Profile profile)
        Create a new expression factory using the default builder and cache implementations. The builder and cache are configured from the specified profile and el.properties (see above). The maximum cache size will be 1000 unless overridden in el.properties.
        Parameters:
        profile - builder profile (features may be overridden in el.properties)
        Since:
        2.2

      • ExpressionFactoryImpl

        public ExpressionFactoryImpl​(java.util.Properties properties)
        Create a new expression factory using the default builder and cache implementations. The builder and cache are configured using the specified properties. The maximum cache size will be 1000 unless overridden by property javax.el.cacheSize. The builder profile is ExpressionFactoryImpl.Profile.JEE6 (features may be overridden in properties).
        Parameters:
        properties - used to initialize this factory (may be null)

      • ExpressionFactoryImpl

        public ExpressionFactoryImpl​(ExpressionFactoryImpl.Profile profile,
                             java.util.Properties properties)
        Create a new expression factory using the default builder and cache implementations. The builder and cache are configured using the specified profile and properties. The maximum cache size will be 1000 unless overridden by property javax.el.cacheSize.
        Parameters:
        profile - builder profile (individual features may be overridden in properties)
        properties - used to initialize this factory (may be null)
        Since:
        2.2

      • ExpressionFactoryImpl

        public ExpressionFactoryImpl​(java.util.Properties properties,
                             TypeConverter converter)
        Create a new expression factory using the default builder and cache implementations. The builder and cache are configured using the specified properties. The maximum cache size will be 1000 unless overridden by property javax.el.cacheSize. The builder profile is ExpressionFactoryImpl.Profile.JEE6 (individual features may be overridden in properties).
        Parameters:
        properties - used to initialize this factory (may be null)
        converter - custom type converter

      • ExpressionFactoryImpl

        public ExpressionFactoryImpl​(ExpressionFactoryImpl.Profile profile,
                             java.util.Properties properties,
                             TypeConverter converter)
        Create a new expression factory using the default builder and cache implementations. The builder and cache are configured using the specified profile and properties. The maximum cache size will be 1000 unless overridden by property javax.el.cacheSize.
        Parameters:
        profile - builder profile (individual features may be overridden in properties)
        properties - used to initialize this factory (may be null)
        converter - custom type converter
        Since:
        2.2

      • ExpressionFactoryImpl

        public ExpressionFactoryImpl​(TreeStore store)
        Create a new expression factory.
        Parameters:
        store - the tree store used to parse and cache parse trees.

      • ExpressionFactoryImpl

        public ExpressionFactoryImpl​(TreeStore store,
                             TypeConverter converter)
        Create a new expression factory.
        Parameters:
        store - the tree store used to parse and cache parse trees.
        converter - custom type converter

    • Method Detail

      • loadDefaultProperties

        private java.util.Properties loadDefaultProperties()

      • loadProperties

        private java.util.Properties loadProperties​(java.lang.String path)

      • createTreeStore

        protected TreeStore createTreeStore​(int defaultCacheSize,
                                    ExpressionFactoryImpl.Profile profile,
                                    java.util.Properties properties)
        Create the factory's tree store. This implementation creates a new tree store using the default builder and cache implementations. The builder and cache are configured using the specified properties. The maximum cache size will be as specified unless overridden by property javax.el.cacheSize.

      • createTypeConverter

        protected TypeConverter createTypeConverter​(java.util.Properties properties)
        Create the factory's type converter. This implementation takes the de.odysseus.el.misc.TypeConverter property as the name of a class implementing the de.odysseus.el.misc.TypeConverter interface. If the property is not set, the default converter (TypeConverter.DEFAULT) is used.

      • createTreeBuilder

        protected TreeBuilder createTreeBuilder​(java.util.Properties properties,
                                        Builder.Feature... features)
        Create the factory's builder. This implementation takes the de.odysseus.el.tree.TreeBuilder property as a name of a class implementing the de.odysseus.el.tree.TreeBuilder interface. If the property is not set, a plain de.odysseus.el.tree.impl.Builder is used. If the configured class is a subclass of de.odysseus.el.tree.impl.Builder and which provides a constructor taking an array of Builder.Feature, this constructor will be invoked. Otherwise, the default constructor will be used.

      • load

        private java.lang.Class<?> load​(java.lang.Class<?> clazz,
                                java.util.Properties properties)

      • coerceToType

        public final java.lang.Object coerceToType​(java.lang.Object obj,
                                           java.lang.Class<?> targetType)
        Specified by:
        coerceToType in class javax.el.ExpressionFactory

      • createValueExpression

        public final ObjectValueExpression createValueExpression​(java.lang.Object instance,
                                                         java.lang.Class<?> expectedType)
        Specified by:
        createValueExpression in class javax.el.ExpressionFactory

      • createValueExpression

        public final TreeValueExpression createValueExpression​(javax.el.ELContext context,
                                                       java.lang.String expression,
                                                       java.lang.Class<?> expectedType)
        Specified by:
        createValueExpression in class javax.el.ExpressionFactory

      • createMethodExpression

        public final TreeMethodExpression createMethodExpression​(javax.el.ELContext context,
                                                         java.lang.String expression,
                                                         java.lang.Class<?> expectedReturnType,
                                                         java.lang.Class<?>[] expectedParamTypes)
        Specified by:
        createMethodExpression in class javax.el.ExpressionFactory