Example usage for javax.servlet.jsp PageContext findAttribute

Introduction

In this page you can find the example usage for javax.servlet.jsp PageContext findAttribute.

Prototype


abstract public Object findAttribute(String name);

Source Link

Document

Searches for the named attribute in page, request, session (if valid), and application scope(s) in order and returns the value associated or null.

Usage

From source file:org.rhq.enterprise.gui.legacy.taglib.display.TableTag.java

/**
 * This functionality is borrowed from struts, but I've removed some struts specific features so that this tag can
 * be used both in a struts application, and outside of one.
 *
 * <p/>Locate and return the specified bean, from an optionally specified scope, in the specified page context. If
 * no such bean is found, return <code>null</code> instead.
 *
 * @param  pageContext Page context to be searched
 * @param  name        Name of the bean to be retrieved
 * @param  scope       Scope to be searched (page, request, session, application) or <code>null</code> to use <code>
 *                     findAttribute()</code> instead
 *
 * @throws JspException if an invalid scope name is requested
 *//*  w  w  w . j  a  va2  s .c  om*/

public Object lookup(PageContext pageContext, String name, String scope) throws JspException {
    log.trace("looking up: " + name + " in scope: " + scope);

    Object bean;
    if (scope == null) {
        bean = pageContext.findAttribute(name);
    } else if (scope.equalsIgnoreCase("page")) {
        bean = pageContext.getAttribute(name, PageContext.PAGE_SCOPE);
    } else if (scope.equalsIgnoreCase("request")) {
        bean = pageContext.getAttribute(name, PageContext.REQUEST_SCOPE);
    } else if (scope.equalsIgnoreCase("session")) {
        bean = pageContext.getAttribute(name, PageContext.SESSION_SCOPE);
    } else if (scope.equalsIgnoreCase("application")) {
        bean = pageContext.getAttribute(name, PageContext.APPLICATION_SCOPE);
    } else {
        Object[] objs = { name, scope };
        if (prop.getProperty("error.msg.cant_find_bean") != null) {
            String msg = MessageFormat.format(prop.getProperty("error.msg.cant_find_bean"), objs);
            throw new JspException(msg);
        } else {
            throw new JspException("Could not find " + name + " in scope " + scope);
        }
    }

    return (bean);
}

From source file:org.squale.welcom.taglib.field.util.LayoutUtils.java

/**
 * Get the property 'property' of the bean named WConstants.BEAN_KEY in the given page context Handle classic
 * exception//from   ww w  .jav  a  2  s . c  o  m
 * 
 * @param pageContext le page context
 * @param property le nom de la property
 * @throws JspException exception pouvant etre levee
 * @return le bean
 */
public static Object getBeanFromPageContext(final PageContext pageContext, final String property)
        throws JspException {
    final Object bean = pageContext.findAttribute(name);

    if (bean == null) {
        throw new JspException(messages.getMessage("getter.bean", name));
    }

    Object object = bean;

    if (property != null) {
        try {
            object = PropertyUtils.getProperty(bean, property);
        } catch (final IllegalAccessException e) {
            throw new JspException(messages.getMessage("getter.access", property, name));
        } catch (final InvocationTargetException e) {
            final Throwable t = e.getTargetException();
            throw new JspException(messages.getMessage("getter.result", property, t.toString()));
        } catch (final NoSuchMethodException e) {
            throw new JspException(messages.getMessage("getter.method", property, name));
        }
    }

    return object;
}

From source file:org.squale.welcom.taglib.field.util.LayoutUtils.java

/**
 * Get the property 'property' of the bean named 'name' in the given pageContext. Handle classic Exception
 * //  w ww.java 2s  .c o m
 * @param pageContext le page context
 * @param pName le nom du bean
 * @param property le nom de la property
 * @throws JspException exception pouvant etre levee
 * @return le bean
 */
public static Object getBeanFromPageContext(final PageContext pageContext, final String pName,
        final String property) throws JspException {
    final Object bean = pageContext.findAttribute(pName);

    if (bean == null) {
        throw new JspException(messages.getMessage("getter.bean", pName));
    }

    Object object = bean;

    if (property != null) {
        try {
            object = PropertyUtils.getProperty(bean, property);
        } catch (final IllegalAccessException e) {
            throw new JspException(messages.getMessage("getter.access", property, pName));
        } catch (final InvocationTargetException e) {
            final Throwable t = e.getTargetException();
            throw new JspException(messages.getMessage("getter.result", property, t.toString()));
        } catch (final NoSuchMethodException e) {
            throw new JspException(messages.getMessage("getter.method", property, pName));
        }
    }

    return object;
}

From source file:org.squale.welcom.taglib.field.util.LayoutUtils.java

/**
 * Get the label with the key 'key' from the pageContext messageRessources. Handle classic exception
 * //from   w w  w. j  a v a 2  s .  c  om
 * @param pageContext le page context
 * @param pBundle le bundle
 * @param key la cle
 * @param args les arguments
 * @throws JspException exception pouvant etre levee
 * @return le label
 */
public static String getLabel(final PageContext pageContext, final String pBundle, final String key,
        final Object args[]) throws JspException {
    // Acquire the resources object containing our messages
    final MessageResources resources = (MessageResources) pageContext.findAttribute(pBundle);

    if (resources == null) {
        throw new JspException(messages.getMessage("messageTag.resources", pBundle));
    }

    // Calculate the Locale we will be using
    Locale locale = null;

    try {
        locale = (Locale) pageContext.getAttribute(localeKey, PageContext.SESSION_SCOPE);
    } catch (final IllegalStateException e) { // Invalidated session
        locale = null;
    }

    if (locale == null) {
        locale = Locale.getDefault();
    }

    // Retrieve the message string we are looking for
    final String message = resources.getMessage(locale, key, args);

    if (message == null) {
        return key;
    }

    return message;
}