Package org.apache.jasper.compiler

## Class Compiler

- java.lang.Object
- - org.apache.jasper.compiler.Compiler

- Direct Known Subclasses:
    `AntCompiler`, `JDTCompiler`

      public abstract class Compiler
      extends Object

  Main JSP compiler class. This class uses Ant for compiling.
  Author:
    Anil K. Vijendran, Mandar Raje, Pierre Delisle, Kin-man Chung, Remy Maucherat, Mark Roth

- - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `protected JspCompilationContext` | `ctxt` |
    `protected ErrorDispatcher` | `errDispatcher` |
    `protected JspServletWrapper` | `jsw` |
    `protected Options` | `options` |
    `protected org.apache.jasper.compiler.PageInfo` | `pageInfo` |
    `protected org.apache.jasper.compiler.Node.Nodes` | `pageNodes` |
    `protected org.apache.jasper.compiler.TagFileProcessor` | `tfp` |

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `Compiler()` |

  - ### Method Summary

    All Methods Instance Methods Abstract Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `compile()` | Compile the jsp file from the current engine context.
    `void` | `compile​(boolean compileClass)` | Compile the jsp file from the current engine context.
    `void` | `compile​(boolean compileClass, boolean jspcMode)` | Compile the jsp file from the current engine context.
    `protected abstract void` | `generateClass​(Map<String,​SmapStratum> smaps)` | Servlet compilation.
    `protected Map<String,​SmapStratum>` | `generateJava()` | Compile the jsp file into equivalent servlet in .java file
    `JspCompilationContext` | `getCompilationContext()` |
    `ErrorDispatcher` | `getErrorDispatcher()` |
    `org.apache.jasper.compiler.PageInfo` | `getPageInfo()` |
    `SmapStratum` | `getSmap​(String className)` |
    `void` | `init​(JspCompilationContext ctxt, JspServletWrapper jsw)` |
    `boolean` | `isOutDated()` | This is a protected method intended to be overridden by subclasses of Compiler.
    `boolean` | `isOutDated​(boolean checkClass)` | Determine if a compilation is necessary by checking the time stamp of the JSP page with that of the corresponding .class or .java file.
    `void` | `removeGeneratedClassFiles()` |
    `void` | `removeGeneratedFiles()` | Remove generated files

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

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

- - ### Field Detail

    - #### ctxt

          protected JspCompilationContext ctxt

    - #### errDispatcher

          protected ErrorDispatcher errDispatcher

    - #### pageInfo

          protected org.apache.jasper.compiler.PageInfo pageInfo

    - #### jsw

          protected JspServletWrapper jsw

    - #### tfp

          protected org.apache.jasper.compiler.TagFileProcessor tfp

    - #### options

          protected Options options

    - #### pageNodes

          protected org.apache.jasper.compiler.Node.Nodes pageNodes

  - ### Constructor Detail

    - #### Compiler

          public Compiler()

  - ### Method Detail

    - #### init

          public void init​(JspCompilationContext ctxt,
                           JspServletWrapper jsw)

    - #### getSmap

          public SmapStratum getSmap​(String className)

    - #### generateJava

          protected Map<String,​SmapStratum> generateJava()
                                                        throws Exception

      Compile the jsp file into equivalent servlet in .java file
      Returns:
        A map of class names to JSR 045 source maps
      Throws:
        `Exception` - Error generating Java source

    - #### generateClass

          protected abstract void generateClass​(Map<String,​SmapStratum> smaps)
                                         throws FileNotFoundException,
                                                JasperException,
                                                Exception

      Servlet compilation. This compiles the generated sources into Servlets.
      Parameters:
        `smaps` - The source maps for the class(es) generated from the source file
      Throws:
        `FileNotFoundException` - Source files not found
        `JasperException` - Compilation error
        `Exception` - Some other error

    - #### compile

          public void compile()
                       throws FileNotFoundException,
                              JasperException,
                              Exception

      Compile the jsp file from the current engine context.
      Throws:
        `FileNotFoundException` - Source files not found
        `JasperException` - Compilation error
        `Exception` - Some other error

    - #### compile

          public void compile​(boolean compileClass)
                       throws FileNotFoundException,
                              JasperException,
                              Exception

      Compile the jsp file from the current engine context. As an side- effect, tag files that are referenced by this page are also compiled.
      Parameters:
        `compileClass` - If true, generate both .java and .class file If false, generate only .java file
      Throws:
        `FileNotFoundException` - Source files not found
        `JasperException` - Compilation error
        `Exception` - Some other error

    - #### compile

          public void compile​(boolean compileClass,
                              boolean jspcMode)
                       throws FileNotFoundException,
                              JasperException,
                              Exception

      Compile the jsp file from the current engine context. As an side- effect, tag files that are referenced by this page are also compiled.
      Parameters:
        `compileClass` - If true, generate both .java and .class file If false, generate only .java file
        `jspcMode` - true if invoked from JspC, false otherwise
      Throws:
        `FileNotFoundException` - Source files not found
        `JasperException` - Compilation error
        `Exception` - Some other error

    - #### isOutDated

          public boolean isOutDated()

      This is a protected method intended to be overridden by subclasses of Compiler. This is used by the compile method to do all the compilation.
      Returns:
        `true` if the source generation and compilation should occur

    - #### isOutDated

          public boolean isOutDated​(boolean checkClass)

      Determine if a compilation is necessary by checking the time stamp of the JSP page with that of the corresponding .class or .java file. If the page has dependencies, the check is also extended to its dependents, and so on. This method can by overridden by a subclasses of Compiler.
      Parameters:
        `checkClass` - If true, check against .class file, if false, check against .java file.
      Returns:
        `true` if the source generation and compilation should occur

    - #### getErrorDispatcher

          public ErrorDispatcher getErrorDispatcher()

      Returns:
        the error dispatcher.

    - #### getPageInfo

          public org.apache.jasper.compiler.PageInfo getPageInfo()

      Returns:
        the info about the page under compilation

    - #### getCompilationContext

          public JspCompilationContext getCompilationContext()

    - #### removeGeneratedFiles

          public void removeGeneratedFiles()

      Remove generated files

    - #### removeGeneratedClassFiles

          public void removeGeneratedClassFiles()