Compiler (Apache Tomcat 8.0.15 API Documentation)

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

Constructor Summary

Constructors
Constructor and Description

Compiler()

Constructors
Constructor and Description
`Compiler()`

Method Summary

Methods
Modifier and Type	Method and 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(String[] smap)` Compile the servlet from .java file to .class file
`protected String[]`	`generateJava()` Compile the jsp file into equivalent servlet in .java file
`JspCompilationContext`	`getCompilationContext()`
`ErrorDispatcher`	`getErrorDispatcher()` Gets the error dispatcher.
`org.apache.jasper.compiler.PageInfo`	`getPageInfo()` Gets the info about the page under compilation
`Node.Nodes`	`getPageNodes()` Retrieves the parsed nodes of the JSP page, if they are available.
`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 Node.Nodes pageNodes
```
- Constructor Detail
  - Compiler
```
public Compiler()
```
- Method Detail
  - init
```
public void init(JspCompilationContext ctxt,
        JspServletWrapper jsw)
```
  - getPageNodes
```
public Node.Nodes getPageNodes()
```
    Retrieves the parsed nodes of the JSP page, if they are available. May return null. Used in development mode for generating detailed error messages. http://issues.apache.org/bugzilla/show_bug.cgi?id=37062.
  - generateJava
```
protected String[] generateJava()
                         throws Exception
```
    Compile the jsp file into equivalent servlet in .java file
    
    Returns:
    a smap for the current JSP page, if one is generated, null otherwise
    
    Throws:
    
    Exception
  - generateClass
```
protected abstract void generateClass(String[] smap)
                               throws FileNotFoundException,
                                      JasperException,
                                      Exception
```
    Compile the servlet from .java file to .class file
    
    Throws:
    
    FileNotFoundException
    
    JasperException
    
    Exception
  - compile
```
public void compile()
             throws FileNotFoundException,
                    JasperException,
                    Exception
```
    Compile the jsp file from the current engine context
    
    Throws:
    
    FileNotFoundException
    
    JasperException
    
    Exception
  - 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
    
    JasperException
    
    Exception
  - 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
    
    JasperException
    
    Exception
  - 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.
  - 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.
  - getErrorDispatcher
```
public ErrorDispatcher getErrorDispatcher()
```
    Gets the error dispatcher.
  - getPageInfo
```
public org.apache.jasper.compiler.PageInfo getPageInfo()
```
    Gets the info about the page under compilation
  - getCompilationContext
```
public JspCompilationContext getCompilationContext()
```
  - removeGeneratedFiles
```
public void removeGeneratedFiles()
```
    Remove generated files
  - removeGeneratedClassFiles
```
public void removeGeneratedClassFiles()
```

Class Compiler

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

ctxt

errDispatcher

pageInfo

jsw

tfp

options

pageNodes

Constructor Detail

Compiler

Method Detail

init

getPageNodes

generateJava

generateClass

compile

compile

compile

isOutDated

isOutDated

getErrorDispatcher

getPageInfo

getCompilationContext

removeGeneratedFiles

removeGeneratedClassFiles