Attachment 29685 Details for Bug 54239 – ELInterpreterFactory

ELInterpreterFactory

ELInterpreterFactory.java (text/plain), 3.15 KB, created by Sheldon Shao on 2012-12-04 06:56:48 UTC

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Creator: Sheldon Shao

Created: 2012-12-04 06:56:48 UTC

Size: 3.15 KB

patch

obsolete

>package org.apache.jasper.compiler;
>
>import javax.servlet.ServletContext;
>
>import org.apache.jasper.JspCompilationContext;
>
>public class ELInterpreterFactory {
>
>    private ELInterpreterFactory() {
>    }
>
>    public static final String EL_INTERPRETER_CLASS = System.getProperty(ELInterpreter.class.getName());
>    
>    private static enum DefaultELInterpreter implements ELInterpreter {
>        INSTANCE;
>
>        /**
>         * Produces a String representing a call to the EL interpreter.
>         *
>         * @param context JspCompilationContext
>         * @param expression
>         *            a String containing zero or more "${}" expressions
>         * @param expectedType
>         *            the expected type of the interpreted result
>         * @param fnmapvar
>         *            Variable pointing to a function map.
>         * @param XmlEscape
>         *            True if the result should do XML escaping
>         * @return a String representing a call to the EL interpreter.
>         */
>        @Override
>        public String interpreterCall(JspCompilationContext context,
>                boolean isTagFile, String expression,
>                Class<?> expectedType, String fnmapvar, boolean xmlEscape) {
>            return JspUtil.interpreterCall(isTagFile, expression, expectedType, fnmapvar, xmlEscape);
>        }
>    }
>    
>    private static ELInterpreter interpreter;
>
>    public static ELInterpreter getELInterpreter(ServletContext context) {
>        if (interpreter == null) {
>            Object conf = context.getAttribute(ELInterpreter.class.getName());
>            if (conf == null) {
>                if (EL_INTERPRETER_CLASS != null) {
>                    interpreter = toInterpreter(context, EL_INTERPRETER_CLASS);
>                }
>                else {
>                    interpreter =  DefaultELInterpreter.INSTANCE;
>                }
>            }
>            else if (conf instanceof ELInterpreter) {
>                interpreter = (ELInterpreter)conf;
>            }
>            else if (conf instanceof String) {
>                interpreter = toInterpreter(context, (String)conf);
>            }
>            return interpreter;
>        }
>        return interpreter;
>    }
>    
>    private static ELInterpreter toInterpreter(ServletContext context, String className) {
>        try {
>            Object instance = context.getClassLoader().loadClass(className).newInstance();
>            if (instance instanceof ELInterpreter) {
>                return (ELInterpreter)instance;
>            }
>            else {
>                throw new IllegalStateException("The class for ELInterpreter doesn't implement org.apache.jasper.compiler.ELInterpreter:" + className);
>            }
>        } catch (ClassNotFoundException e) {
>            throw new IllegalStateException("The class for ELInterpreter can't be found:" + className);
>        } catch (IllegalAccessException e) {
>            throw new IllegalStateException("Can't create ELInterpreter:" + className);
>        } catch (InstantiationException e) {
>            throw new IllegalStateException("Can't create ELInterpreter:" + className);
>        }
>    }
>}

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