Example usage for javax.servlet.jsp PageContext PAGE

Introduction

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

Prototype

int PAGE_SCOPE

To view the source code for javax.servlet.jsp PageContext PAGE_SCOPE.

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Document

Page scope: (this is the default) the named reference remains available in this PageContext until the return from the current Servlet.service() invocation.

Usage

From source file:org.apache.sling.scripting.jsp.taglib.IncludeTagHandler.java

/**
 * Gets the int code for a valid scope, must be one of 'page', 'request',
 * 'session' or 'application'. If an invalid or no scope is specified page
 * scope is returned.//w w w .  j  a  va 2s . c o  m
 * 
 * @param scope
 * @return
 */
private Integer validScope(String scope) {
    scope = (scope != null && scope.trim().length() > 0 ? scope.trim().toUpperCase() : null);
    if (scope == null) {
        return PageContext.PAGE_SCOPE;
    }

    String[] scopes = { "PAGE", "REQUEST", "SESSION", "APPLICATION" };
    Integer[] iaScopes = { PageContext.PAGE_SCOPE, PageContext.REQUEST_SCOPE, PageContext.SESSION_SCOPE,
            PageContext.APPLICATION_SCOPE };

    for (int ndx = 0, len = scopes.length; ndx < len; ndx++) {
        if (scopes[ndx].equals(scope)) {
            return iaScopes[ndx];
        }
    }
    return PageContext.PAGE_SCOPE;
}

From source file:org.apache.struts.taglib.bean.DefineTag.java

/**
 * Retrieve the required property and expose it as a scripting variable.
 *
 * @throws JspException if a JSP exception has occurred
 *///  www . j  a  v  a  2  s.c o m
public int doEndTag() throws JspException {
    // Enforce restriction on ways to declare the new value
    int n = 0;

    if (this.body != null) {
        n++;
    }

    if (this.name != null) {
        n++;
    }

    if (this.value != null) {
        n++;
    }

    if (n > 1) {
        JspException e = new JspException(messages.getMessage("define.value", id));

        TagUtils.getInstance().saveException(pageContext, e);
        throw e;
    }

    // Retrieve the required property value
    Object value = this.value;

    if ((value == null) && (name != null)) {
        value = TagUtils.getInstance().lookup(pageContext, name, property, scope);
    }

    if ((value == null) && (body != null)) {
        value = body;
    }

    if (value == null) {
        JspException e = new JspException(messages.getMessage("define.null", id));

        TagUtils.getInstance().saveException(pageContext, e);
        throw e;
    }

    // Expose this value as a scripting variable
    int inScope = PageContext.PAGE_SCOPE;

    try {
        if (toScope != null) {
            inScope = TagUtils.getInstance().getScope(toScope);
        }
    } catch (JspException e) {
        log.warn("toScope was invalid name so we default to PAGE_SCOPE", e);
    }

    pageContext.setAttribute(id, value, inScope);

    // Continue processing this page
    return (EVAL_PAGE);
}

From source file:org.apache.struts.taglib.TagUtils.java

/**
 * Returns true if the custom tags are in XHTML mode.
 *///  w  w  w.j  a  va  2  s .  c o  m
public boolean isXhtml(PageContext pageContext) {
    String xhtml = (String) pageContext.getAttribute(Globals.XHTML_KEY, PageContext.PAGE_SCOPE);

    return "true".equalsIgnoreCase(xhtml);
}

From source file:org.apache.struts.taglib.TagUtils.java

/**
 * Returns the appropriate MessageResources object for the current module
 * and the given bundle./*  w ww .  j ava 2  s  .  c  om*/
 *
 * @param pageContext    Search the context's scopes for the resources.
 * @param bundle         The bundle name to look for.  If this is
 *                       <code>null</code>, the default bundle name is
 *                       used.
 * @param checkPageScope Whether to check page scope
 * @return MessageResources The bundle's resources stored in some scope.
 * @throws JspException if the MessageResources object could not be
 *                      found.
 */
public MessageResources retrieveMessageResources(PageContext pageContext, String bundle, boolean checkPageScope)
        throws JspException {
    MessageResources resources = null;

    if (bundle == null) {
        bundle = Globals.MESSAGES_KEY;
    }

    if (checkPageScope) {
        resources = (MessageResources) pageContext.getAttribute(bundle, PageContext.PAGE_SCOPE);
    }

    if (resources == null) {
        resources = (MessageResources) pageContext.getAttribute(bundle, PageContext.REQUEST_SCOPE);
    }

    if (resources == null) {
        ModuleConfig moduleConfig = getModuleConfig(pageContext);

        resources = (MessageResources) pageContext.getAttribute(bundle + moduleConfig.getPrefix(),
                PageContext.APPLICATION_SCOPE);
    }

    if (resources == null) {
        resources = (MessageResources) pageContext.getAttribute(bundle, PageContext.APPLICATION_SCOPE);
    }

    if (resources == null) {
        JspException e = new JspException(messages.getMessage("message.bundle", bundle));

        saveException(pageContext, e);
        throw e;
    }

    return resources;
}

From source file:org.apache.struts.taglib.TestTagUtils.java

public void donttestMessagePageBadKey() {
    putBundleInScope(PageContext.PAGE_SCOPE, true);

    String val = null;

    try {//from   ww  w. ja v  a  2s .c om
        val = tagutils.message(pageContext, null, null, "foo.bar.does.not.exist");
        fail("val should be null");
    } catch (JspException e) {
        assertNull(val);
    }
}

From source file:org.apache.struts.taglib.tiles.util.TagUtils.java

/**
 * Retrieve bean from page context, using specified scope.
 * If scope is not set, use <code>findAttribute()</code>.
 *
 * @param beanName Name of bean to retrieve.
 * @param scopeName Scope or <code>null</code>. If <code>null</code>, bean is searched using
 *  findAttribute()./*from   w w w  . j  a va2 s . c  o  m*/
 * @param pageContext Current pageContext.
 * @return Requested bean or <code>null</code> if not found.
 * @throws JspException Scope name is not recognized as a valid scope.
 */
public static Object retrieveBean(String beanName, String scopeName, PageContext pageContext)
        throws JspException {

    if (scopeName == null) {
        return findAttribute(beanName, pageContext);
    }

    // Default value doesn't matter because we have already check it
    int scope = getScope(scopeName, PageContext.PAGE_SCOPE);

    //return pageContext.getAttribute( beanName, scope );
    return getAttribute(beanName, scope, pageContext);
}

From source file:org.apache.struts.taglib.tiles.util.TagUtils.java

/**
 * Store bean in requested context./*from  w ww . j  a va 2s.c o  m*/
 * If scope is <code>null</code>, save it in REQUEST_SCOPE context.
 *
 * @param pageContext Current pageContext.
 * @param name Name of the bean.
 * @param scope Scope under which bean is saved (page, request, session, application)
 *  or <code>null</code> to store in <code>request()</code> instead.
 * @param value Bean value to store.
 *
 * @exception JspException Scope name is not recognized as a valid scope
 */
public static void setAttribute(PageContext pageContext, String name, Object value, String scope)
        throws JspException {

    if (scope == null)
        pageContext.setAttribute(name, value, PageContext.REQUEST_SCOPE);
    else if (scope.equalsIgnoreCase("page"))
        pageContext.setAttribute(name, value, PageContext.PAGE_SCOPE);
    else if (scope.equalsIgnoreCase("request"))
        pageContext.setAttribute(name, value, PageContext.REQUEST_SCOPE);
    else if (scope.equalsIgnoreCase("session"))
        pageContext.setAttribute(name, value, PageContext.SESSION_SCOPE);
    else if (scope.equalsIgnoreCase("application"))
        pageContext.setAttribute(name, value, PageContext.APPLICATION_SCOPE);
    else {
        throw new JspException("Error - bad scope name '" + scope + "'");
    }
}

From source file:org.apache.tiles.jsp.taglib.AttributeTagSupport.java

/** {@inheritDoc} */
@Override/*  w w w .  jav  a 2 s  . c om*/
protected void reset() {
    super.reset();
    scopeName = null;
    scope = PageContext.PAGE_SCOPE;
    ignore = false;
    attribute = null;
    attributeValue = null;
    attributeContext = null;
}

From source file:org.apache.tiles.jsp.taglib.AttributeTagSupport.java

/**
 * Get scope value from string value./*from   w  ww  . java  2 s  .  com*/
 *
 * @return Scope as an <code>int</code>, or <code>defaultValue</code> if scope is <code>null</code>.
 * @throws TilesJspException Scope name is not recognized as a valid scope.
 */
public int getScopeId() throws TilesJspException {
    if (scopeName == null) {
        return PageContext.PAGE_SCOPE;
    }

    return getScope(scopeName);
}

From source file:org.apache.webapp.admin.AttributeTag.java

/**
 * Render the JMX MBean attribute identified by this tag
 *
 * @exception JspException if a processing exception occurs
 *///w  ww . j a  v a 2  s . c  o  m
public int doEndTag() throws JspException {

    // Retrieve the object name identified by our attributes
    Object bean = null;
    if (scope == null) {
        bean = pageContext.findAttribute(name);
    } else if ("page".equalsIgnoreCase(scope)) {
        bean = pageContext.getAttribute(name, PageContext.PAGE_SCOPE);
    } else if ("request".equalsIgnoreCase(scope)) {
        bean = pageContext.getAttribute(name, PageContext.REQUEST_SCOPE);
    } else if ("session".equalsIgnoreCase(scope)) {
        bean = pageContext.getAttribute(name, PageContext.SESSION_SCOPE);
    } else if ("application".equalsIgnoreCase(scope)) {
        bean = pageContext.getAttribute(name, PageContext.APPLICATION_SCOPE);
    } else {
        throw new JspException("Invalid scope value '" + scope + "'");
    }
    if (bean == null) {
        throw new JspException("No bean '" + name + "' found");
    }
    if (property != null) {
        try {
            bean = PropertyUtils.getProperty(bean, property);
        } catch (Throwable t) {
            throw new JspException("Exception retrieving property '" + property + "': " + t);
        }
        if (bean == null) {
            throw new JspException("No property '" + property + "' found");
        }
    }

    // Convert to an object name as necessary
    ObjectName oname = null;
    try {
        if (bean instanceof ObjectName) {
            oname = (ObjectName) bean;
        } else if (bean instanceof String) {
            oname = new ObjectName((String) bean);
        } else {
            oname = new ObjectName(bean.toString());
        }
    } catch (Throwable t) {
        throw new JspException("Exception creating object name for '" + bean + "': " + t);
    }

    // Acquire a reference to our MBeanServer
    MBeanServer mserver = (MBeanServer) pageContext.getAttribute("org.apache.catalina.MBeanServer",
            PageContext.APPLICATION_SCOPE);
    if (mserver == null)
        throw new JspException("MBeanServer is not available");

    // Retrieve the specified attribute from the specified MBean
    Object value = null;
    try {
        value = mserver.getAttribute(oname, attribute);
    } catch (Throwable t) {
        throw new JspException("Exception retrieving attribute '" + attribute + "'");
    }

    // Render this value to our current output writer
    if (value != null) {
        JspWriter out = pageContext.getOut();
        try {
            out.print(value);
        } catch (IOException e) {
            throw new JspException("IOException: " + e);
        }
    }

    // Evaluate the remainder of this page
    return (EVAL_PAGE);

}

Example usage for javax.servlet.jsp PageContext PAGE_SCOPE

Introduction

Prototype

Document

Usage