Package org.drools.mvel.parser

Class MvelParser

  • public final class MvelParser
extends Object
    Parse Java source code and creates Abstract Syntax Trees.

    • Constructor Summary

      Constructors 
      Constructor Description
      MvelParser()
      Instantiate the parser with default configuration.
      MvelParser​(com.github.javaparser.ParserConfiguration configuration)
      Instantiate the parser.
      MvelParser​(com.github.javaparser.ParserConfiguration configuration, boolean optionalSemicolon)  

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      com.github.javaparser.ParserConfiguration getParserConfiguration()
      Get the non-static configuration for this parser.
      static com.github.javaparser.ParserConfiguration getStaticConfiguration()
      Get the configuration for the static parse... methods.
      static com.github.javaparser.ast.expr.Expression parse​(InputStream in)
      Parses the Java code contained in the InputStream and returns a Expression that represents it.
      Note: Uses UTF-8 encoding
      static com.github.javaparser.ast.expr.Expression parse​(InputStream in, Charset encoding)
      Parses the Java code contained in the InputStream and returns a Expression that represents it.
      static com.github.javaparser.ast.expr.Expression parse​(Reader reader)
      Parses Java code from a Reader and returns a Expression that represents it.
      static com.github.javaparser.ast.expr.Expression parse​(String code)
      Parses the Java code contained in code and returns a Expression that represents it.
      <N extends com.github.javaparser.ast.Node>
      com.github.javaparser.ParseResult<N>      		 parse​(ParseStart<N> start, Provider provider)
      Parses source code.
      static com.github.javaparser.ast.stmt.BlockStmt parseBlock​(String blockStatement)
      Parses the Java block contained in a String and returns a BlockStmt that represents it.
      static com.github.javaparser.ast.type.ClassOrInterfaceType parseClassOrInterfaceType​(String type)
      Parses a Java class or interface type name and returns a ClassOrInterfaceType that represents it.
      static com.github.javaparser.ast.stmt.ExplicitConstructorInvocationStmt parseExplicitConstructorInvocationStmt​(String statement)
      Parses the this(...) and super(...) statements that may occur at the start of a constructor.
      static <T extends com.github.javaparser.ast.expr.Expression>
      T      		 parseExpression​(String expression)
      Parses the Java expression contained in a String and returns a Expression that represents it.
      static com.github.javaparser.ast.expr.Name parseName​(String qualifiedName)
      Parses a qualified name (one that can have "."
      static com.github.javaparser.ast.expr.Expression parseResource​(ClassLoader classLoader, String path, Charset encoding)
      Parses the Java code contained in a resource and returns a Expression that represents it.
      static com.github.javaparser.ast.expr.Expression parseResource​(String path)
      Parses the Java code contained in a resource and returns a Expression that represents it.
      Note: Uses UTF-8 encoding
      static com.github.javaparser.ast.expr.Expression parseResource​(String path, Charset encoding)
      Parses the Java code contained in a resource and returns a Expression that represents it.
      static com.github.javaparser.ast.expr.SimpleName parseSimpleName​(String name)
      Parses a simple name (one that can NOT have "."
      static com.github.javaparser.ast.type.Type parseType​(String type)
      Parses a Java type name and returns a Type that represents it.
      static void setStaticConfiguration​(com.github.javaparser.ParserConfiguration staticConfiguration)
      Set the configuration for the static parse... methods.

    • Constructor Detail

      • MvelParser

        public MvelParser()
        Instantiate the parser with default configuration. Note that parsing can also be done with the static methods on this class. Creating an instance will reduce setup time between parsing files.

      • MvelParser

        public MvelParser​(com.github.javaparser.ParserConfiguration configuration)
        Instantiate the parser. Note that parsing can also be done with the static methods on this class. Creating an instance will reduce setup time between parsing files.

      • MvelParser

        public MvelParser​(com.github.javaparser.ParserConfiguration configuration,
                  boolean optionalSemicolon)

    • Method Detail

      • getStaticConfiguration

        public static com.github.javaparser.ParserConfiguration getStaticConfiguration()
        Get the configuration for the static parse... methods. This is a STATIC field, so modifying it will directly change how all static parse... methods work!

      • setStaticConfiguration

        public static void setStaticConfiguration​(com.github.javaparser.ParserConfiguration staticConfiguration)
        Set the configuration for the static parse... methods. This is a STATIC field, so modifying it will directly change how all static parse... methods work!

      • getParserConfiguration

        public com.github.javaparser.ParserConfiguration getParserConfiguration()
        Get the non-static configuration for this parser.
        Returns:
        The non-static configuration for this parser.

      • parse

        public <N extends com.github.javaparser.ast.Node> com.github.javaparser.ParseResult<N> parse​(ParseStart<N> start,
                                                                                             Provider provider)
        Parses source code. It takes the source code from a Provider. The start indicates what can be found in the source code (compilation unit, block, import...)
        Type Parameters:
        N - the subclass of Node that is the result of parsing in the start.
        Parameters:
        start - refer to the constants in ParseStart to see what can be parsed.
        provider - refer to Providers to see how you can read source. The provider will be closed after parsing.
        Returns:
        the parse result, a collection of encountered problems, and some extra data.

      • parse

        public static com.github.javaparser.ast.expr.Expression parse​(InputStream in,
                                                              Charset encoding)
        Parses the Java code contained in the InputStream and returns a Expression that represents it.
        Parameters:
        in - InputStream containing Java source code. It will be closed after parsing.
        encoding - encoding of the source code
        Returns:
        Expression representing the Java source code
        Throws:
        com.github.javaparser.ParseProblemException - if the source code has parser errors

      • parse

        public static com.github.javaparser.ast.expr.Expression parse​(InputStream in)
        Parses the Java code contained in the InputStream and returns a Expression that represents it.
        Note: Uses UTF-8 encoding
        Parameters:
        in - InputStream containing Java source code. It will be closed after parsing.
        Returns:
        Expression representing the Java source code
        Throws:
        com.github.javaparser.ParseProblemException - if the source code has parser errors

      • parseResource

        public static com.github.javaparser.ast.expr.Expression parseResource​(String path)
                                                               throws IOException
        Parses the Java code contained in a resource and returns a Expression that represents it.
        Note: Uses UTF-8 encoding
        Parameters:
        path - path to a resource containing Java source code. As resource is accessed through a class loader, a leading "/" is not allowed in pathToResource
        Returns:
        Expression representing the Java source code
        Throws:
        com.github.javaparser.ParseProblemException - if the source code has parser errors
        IOException - the path could not be accessed

      • parseResource

        public static com.github.javaparser.ast.expr.Expression parseResource​(String path,
                                                                      Charset encoding)
                                                               throws IOException
        Parses the Java code contained in a resource and returns a Expression that represents it.
        Parameters:
        path - path to a resource containing Java source code. As resource is accessed through a class loader, a leading "/" is not allowed in pathToResource
        encoding - encoding of the source code
        Returns:
        Expression representing the Java source code
        Throws:
        com.github.javaparser.ParseProblemException - if the source code has parser errors
        IOException - the path could not be accessed

      • parseResource

        public static com.github.javaparser.ast.expr.Expression parseResource​(ClassLoader classLoader,
                                                                      String path,
                                                                      Charset encoding)
                                                               throws IOException
        Parses the Java code contained in a resource and returns a Expression that represents it.
        Parameters:
        classLoader - the classLoader that is asked to load the resource
        path - path to a resource containing Java source code. As resource is accessed through a class loader, a leading "/" is not allowed in pathToResource
        Returns:
        Expression representing the Java source code
        Throws:
        com.github.javaparser.ParseProblemException - if the source code has parser errors
        IOException - the path could not be accessed

      • parse

        public static com.github.javaparser.ast.expr.Expression parse​(Reader reader)
        Parses Java code from a Reader and returns a Expression that represents it.
        Parameters:
        reader - the reader containing Java source code. It will be closed after parsing.
        Returns:
        Expression representing the Java source code
        Throws:
        com.github.javaparser.ParseProblemException - if the source code has parser errors

      • parse

        public static com.github.javaparser.ast.expr.Expression parse​(String code)
        Parses the Java code contained in code and returns a Expression that represents it.
        Parameters:
        code - Java source code
        Returns:
        Expression representing the Java source code
        Throws:
        com.github.javaparser.ParseProblemException - if the source code has parser errors

      • parseBlock

        public static com.github.javaparser.ast.stmt.BlockStmt parseBlock​(String blockStatement)
        Parses the Java block contained in a String and returns a BlockStmt that represents it.
        Parameters:
        blockStatement - String containing Java block code
        Returns:
        BlockStmt representing the Java block
        Throws:
        com.github.javaparser.ParseProblemException - if the source code has parser errors

      • parseExpression

        public static <T extends com.github.javaparser.ast.expr.Expression> T parseExpression​(String expression)
        Parses the Java expression contained in a String and returns a Expression that represents it.
        Parameters:
        expression - String containing Java expression
        Returns:
        Expression representing the Java expression
        Throws:
        com.github.javaparser.ParseProblemException - if the source code has parser errors

      • parseClassOrInterfaceType

        public static com.github.javaparser.ast.type.ClassOrInterfaceType parseClassOrInterfaceType​(String type)
        Parses a Java class or interface type name and returns a ClassOrInterfaceType that represents it.
        Parameters:
        type - the type name like a.b.c.X or Y
        Returns:
        ClassOrInterfaceType representing the type
        Throws:
        com.github.javaparser.ParseProblemException - if the source code has parser errors

      • parseType

        public static com.github.javaparser.ast.type.Type parseType​(String type)
        Parses a Java type name and returns a Type that represents it.
        Parameters:
        type - the type name like a.b.c.X, Y, or int
        Returns:
        ClassOrInterfaceType representing the type
        Throws:
        com.github.javaparser.ParseProblemException - if the source code has parser errors

      • parseExplicitConstructorInvocationStmt

        public static com.github.javaparser.ast.stmt.ExplicitConstructorInvocationStmt parseExplicitConstructorInvocationStmt​(String statement)
        Parses the this(...) and super(...) statements that may occur at the start of a constructor.
        Parameters:
        statement - a statement like super("hello");
        Returns:
        the AST for the statement.
        Throws:
        com.github.javaparser.ParseProblemException - if the source code has parser errors

      • parseName

        public static com.github.javaparser.ast.expr.Name parseName​(String qualifiedName)
        Parses a qualified name (one that can have "."s in it) and returns it as a Name.
        Parameters:
        qualifiedName - a name like "com.laamella.parameter_source"
        Returns:
        the AST for the name
        Throws:
        com.github.javaparser.ParseProblemException - if the source code has parser errors

      • parseSimpleName

        public static com.github.javaparser.ast.expr.SimpleName parseSimpleName​(String name)
        Parses a simple name (one that can NOT have "."s in it) and returns it as a SimpleName.
        Parameters:
        name - a name like "parameter_source"
        Returns:
        the AST for the name
        Throws:
        com.github.javaparser.ParseProblemException - if the source code has parser errors