Get attribute from page context of the given name in the given scope for JSP Page. - Java javax.servlet.jsp

Java examples for javax.servlet.jsp:PageContext

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Description

Get attribute from page context of the given name in the given scope for JSP Page.

Demo Code

/*/*from ww w .  j av  a  2s .  c o  m*/
 * Copyright (c)2004 Mark Logic Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * The use of the Apache License does not indicate that this project is
 * affiliated with the Apache Software Foundation.
 */
import javax.servlet.jsp.PageContext;

public class Main{
    /**
     * Get attribute from page context of the given name in the given scope.
     * @param pageContext Page context reference.
     * @param name The name of the attribute.
     * @param scope The scope as defined in the PageContext class.
     * @return The value of the attribute, or null.
     */
    public static Object getScopedAttribute(PageContext pageContext,
            String name, int scope) {
        return ((name == null) ? null : pageContext.getAttribute(name,
                scope));
    }
    /**
     * Get attribute from page context of the given name in the given scope.
     * @param pageContext Page context reference.
     * @param name The name of the attribute.
     * @param scope The scope name as a string: page, request, session or application.
     * @return The value of the attribute, or null.
     */
    public static Object getScopedAttribute(PageContext pageContext,
            String name, String scope) {
        return (getScopedAttribute(pageContext, name,
                attributeScopeFromName(scope)));
    }
    /**
     * Given the name of a scope as a string (page, request, session or application),
     * return the corresponding numeric code as defined in the PageContext class.
     * @param scope The scope name as a string: page, request, session or application.
     * @return The numeric scope code as defined in the PageContext class.
     */
    public static int attributeScopeFromName(String scope) {
        int scopeValue = PageContext.PAGE_SCOPE;

        if (scope != null) {
            if (scope.equalsIgnoreCase("page")) {
                scopeValue = PageContext.PAGE_SCOPE;
            }
            if (scope.equalsIgnoreCase("request")) {
                scopeValue = PageContext.REQUEST_SCOPE;
            }
            if (scope.equalsIgnoreCase("session")) {
                scopeValue = PageContext.SESSION_SCOPE;
            }
            if (scope.equalsIgnoreCase("application")) {
                scopeValue = PageContext.APPLICATION_SCOPE;
            }
        }

        return scopeValue;
    }
}

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