com.revolsys.ui.web.config.JexlHttpServletRequestContext.java Source code

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Here is the source code for com.revolsys.ui.web.config.JexlHttpServletRequestContext.java

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/*
 * Copyright 2004-2005 Revolution Systems Inc.
 *
 * 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.
 */
package com.revolsys.ui.web.config;

import java.util.AbstractMap;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;

import org.apache.commons.jexl.JexlContext;
import org.springframework.web.util.UrlPathHelper;

public class JexlHttpServletRequestContext implements JexlContext {
    private final HttpServletRequest request;

    private final ServletContext servletContext;

    private final UrlPathHelper urlPathHelper = new UrlPathHelper();

    public JexlHttpServletRequestContext(final HttpServletRequest request) {
        this.request = request;

        this.servletContext = WebUiContext.getServletContext();
    }

    @Override
    public Map getVars() {
        return new AbstractMap() {
            @Override
            public Set entrySet() {
                final Map map = new HashMap();
                map.putAll(JexlHttpServletRequestContext.this.request.getParameterMap());
                for (final Enumeration names = JexlHttpServletRequestContext.this.request.getAttributeNames(); names
                        .hasMoreElements();) {
                    final String name = (String) names.nextElement();
                    map.put(name, JexlHttpServletRequestContext.this.request.getAttribute(name));
                }
                if (JexlHttpServletRequestContext.this.servletContext != null) {
                    for (final Enumeration names = JexlHttpServletRequestContext.this.servletContext
                            .getAttributeNames(); names.hasMoreElements();) {
                        final String name = (String) names.nextElement();
                        map.put(name, JexlHttpServletRequestContext.this.servletContext.getAttribute(name));
                    }
                }
                return map.entrySet();
            }

            @Override
            public Object get(final Object key) {
                if (key.equals("request")) {
                    return JexlHttpServletRequestContext.this.request;
                } else if (key.equals("requestURI")) {
                    return JexlHttpServletRequestContext.this.urlPathHelper
                            .getOriginatingRequestUri(JexlHttpServletRequestContext.this.request);
                }
                final String keyString = key.toString();
                Object value = null;
                if (JexlHttpServletRequestContext.this.servletContext != null) {
                    value = JexlHttpServletRequestContext.this.servletContext.getAttribute(keyString);
                }
                if (value == null) {
                    value = JexlHttpServletRequestContext.this.request.getAttribute(keyString);
                    if (value == null) {
                        value = JexlHttpServletRequestContext.this.request.getParameter(keyString);
                    }
                }
                if (value == null) {
                    return "";
                } else {
                    return value;
                }
            }
        };
    }

    @Override
    public void setVars(final Map arg0) {
    }

}