Class TreeMethodExpression

java.lang.Object
javax.el.Expression
javax.el.MethodExpression
de.odysseus.el.TreeMethodExpression
All Implemented Interfaces:
Serializable
public final class TreeMethodExpression extends javax.el.MethodExpression
A method expression is ready to be evaluated (by calling either invoke(ELContext, Object[]) or getMethodInfo(ELContext)). Instances of this class are usually created using an ExpressionFactoryImpl.
See Also:

  • Field Details

    • serialVersionUID

      private static final long serialVersionUID
      See Also:

    • builder

      private final TreeBuilder builder

    • bindings

      private final Bindings bindings

    • expr

      private final String expr

    • type

      private final Class<?> type

    • types

      private final Class<?>[] types

    • deferred

      private final boolean deferred

    • node

      private transient ExpressionNode node

    • structure

      private String structure

  • Constructor Details

    • TreeMethodExpression

      public TreeMethodExpression(TreeStore store, javax.el.FunctionMapper functions, javax.el.VariableMapper variables, TypeConverter converter, String expr, Class<?> returnType, Class<?>[] paramTypes)
      Create a new method expression. The expression must be an lvalue expression or literal text. The expected return type may be null, meaning "don't care". If it is an lvalue expression, the parameter types must not be null. If it is literal text, the expected return type must not be void.
      Parameters:
      store - used to get the parse tree from.
      functions - the function mapper used to bind functions
      variables - the variable mapper used to bind variables
      expr - the expression string
      returnType - the expected return type (may be null)
      paramTypes - the expected parameter types (must not be null for lvalues)

  • Method Details

    • getStructuralId

      private String getStructuralId()

    • getMethodInfo

      public javax.el.MethodInfo getMethodInfo(javax.el.ELContext context) throws javax.el.ELException
      Evaluates the expression and answers information about the method
      Specified by:
      getMethodInfo in class javax.el.MethodExpression
      Parameters:
      context - used to resolve properties (base.property and base[property])
      Returns:
      method information or null for literal expressions
      Throws:
      javax.el.ELException - if evaluation fails (e.g. suitable method not found)

    • getExpressionString

      public String getExpressionString()
      Specified by:
      getExpressionString in class javax.el.Expression

    • invoke

      public Object invoke(javax.el.ELContext context, Object[] paramValues) throws javax.el.ELException
      Evaluates the expression and invokes the method.
      Specified by:
      invoke in class javax.el.MethodExpression
      Parameters:
      context - used to resolve properties (base.property and base[property])
      paramValues -
      Returns:
      method result or null if this is a literal text expression
      Throws:
      javax.el.ELException - if evaluation fails (e.g. suitable method not found)

    • isLiteralText

      public boolean isLiteralText()
      Specified by:
      isLiteralText in class javax.el.Expression
      Returns:
      true if this is a literal text expression

    • isParmetersProvided

      public boolean isParmetersProvided()
      Overrides:
      isParmetersProvided in class javax.el.MethodExpression
      Returns:
      true if this is a method invocation expression

    • isDeferred

      public boolean isDeferred()
      Answer true if this is a deferred expression (starting with #{)

    • equals

      public boolean equals(Object obj)
      Expressions are compared using the concept of a structural id: variable and function names are anonymized such that two expressions with same tree structure will also have the same structural id and vice versa. Two method expressions are equal if
      1. their builders are equal
      2. their structural id's are equal
      3. their bindings are equal
      4. their expected types match
      5. their parameter types are equal
      Specified by:
      equals in class javax.el.Expression

    • hashCode

      public int hashCode()
      Specified by:
      hashCode in class javax.el.Expression

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • dump

      public void dump(PrintWriter writer)
      Print the parse tree.
      Parameters:
      writer -

    • readObject

      private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException
      Throws:
      IOException
      ClassNotFoundException