com.sun.faces.el.ELContextImpl Maven / Gradle / Ivy

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package com.sun.faces.el;


import javax.el.ELContext;
import javax.el.ELResolver;
import javax.el.FunctionMapper;
import javax.el.ValueExpression;
import javax.el.VariableMapper;
import java.util.Map;
import java.util.HashMap;
import java.lang.reflect.Method;

/**
 * Concrete implementation of {@link javax.el.ELContext}.
 * ELContext's constructor is protected to control creation of ELContext
 * objects through their appropriate factory methods.  This version of
 * ELContext forces construction through FacesContextImpl.
 *
 */
public class ELContextImpl extends ELContext {
    
    private FunctionMapper functionMapper = new NoopFunctionMapper();
    private VariableMapper variableMapper;
    private ELResolver resolver;


    // ------------------------------------------------------------ Constructors


    /**
     * Constructs a new ELContext associated with the given ELResolver.
     * @param resolver the ELResolver to return from {@link #getELResolver()} 
     */
    public ELContextImpl(ELResolver resolver) {
        this.resolver = resolver;
    }


    // -------------------------------------------------- Methods from ELContext


    @Override
    public FunctionMapper getFunctionMapper() {        
        return functionMapper;
    }

    @Override
    public VariableMapper getVariableMapper() {
        if (variableMapper == null) {
            variableMapper = new VariableMapperImpl();
        }
        return variableMapper;
    }

    @Override
    public ELResolver getELResolver() {
        return resolver;
    }


    // ---------------------------------------------------------- Public Methods


    public void setFunctionMapper(FunctionMapper functionMapper) {

        this.functionMapper = functionMapper;

    }


    // ----------------------------------------------------------- Inner Classes


    private static class VariableMapperImpl extends VariableMapper {

        private Map variables;

        public VariableMapperImpl() {

            //noinspection CollectionWithoutInitialCapacity
            variables = new HashMap<>();

        }

        @Override
        public ValueExpression resolveVariable(String s) {
            return variables.get(s);
        }

        @Override
        public ValueExpression setVariable(String s, ValueExpression valueExpression) {
            return (variables.put(s, valueExpression));
        }
    }


    private static class NoopFunctionMapper extends FunctionMapper {

        @Override
        public Method resolveFunction(String s, String s1) {
            return null;
        }

    }

}