com.adobe.granite.ui.components.ExpressionHelper Maven / Gradle / Ivy

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 * ADOBE CONFIDENTIAL
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 *
 *  Copyright 2013 Adobe Systems Incorporated
 *  All Rights Reserved.
 *
 * NOTICE:  All information contained herein is, and remains
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package com.adobe.granite.ui.components;

import java.util.Locale;

import javax.servlet.jsp.PageContext;

/**
 * A helper to deal with EL easier.
 */
public class ExpressionHelper {
    private ExpressionResolver resolver;

    private PageContext pageContext;

    public ExpressionHelper(ExpressionResolver resolver, PageContext pageContext) {
        this.resolver = resolver;
        this.pageContext = pageContext;
    }

    /**
     * Resolves the given expression as string. Request's locale will be used.
     * @param expression the expression to be resolved
     * @return the resolved expression as a string
     */
    public String getString(String expression) {
        return get(expression, String.class);
    }

    /**
     * Resolves the given expression as string, with the given locale.
     * @param expression the expression to be resolved
     * @param locale the locale
     * @return the resolved expression as a string
     */
    public String getString(String expression, Locale locale) {
        return get(expression, locale, String.class);
    }

    /**
     * Resolves the given expression as boolean. Request's locale will be used.
     * @param expression the expression to be resolved
     * @return the resolved expression as a boolean
     */
    public boolean getBoolean(String expression) {
        return get(expression, Boolean.class);
    }

    /**
     * Resolves the given expression as boolean, with the given locale.
     * @param expression the expression to be resolved
     * @param locale the locale
     * @return the resolved expression as a boolean
     */
    public boolean getBoolean(String expression, Locale locale) {
        return get(expression, locale, Boolean.class);
    }

    /**
     * Resolves the given expression. Request's locale will be used.
     * @param expression the expression to be resolved
     * @param expectedType the expected type of the resolved expression
     * @param  the type of the resolved expression
     * @return the resolved expression
     */
    public  T get(String expression, Class expectedType) {
        return get(expression, pageContext.getRequest().getLocale(), expectedType);
    }

    /**
     * Resolves the given expression, with the given locale.
     * @param expression the expression to be resolved
     * @param locale the locale
     * @param expectedType the expected type of the resolved expression
     * @param  the type of the resolved expression
     * @return the resolved expression
     */
    public  T get(String expression, Locale locale, Class expectedType) {
        if (expression == null) return null;
        
        return resolver.resolve(expression, locale, expectedType, pageContext);
    }
}