com.nominanuda.springmvc.StaticViewResolver.java Source code

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Here is the source code for com.nominanuda.springmvc.StaticViewResolver.java

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/*
 * Copyright 2008-2011 the original author or authors.
 * 
 * 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.nominanuda.springmvc;

import java.io.IOException;
import java.io.OutputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.View;
import org.springframework.web.servlet.ViewResolver;

import com.nominanuda.io.IOHelper;
import com.nominanuda.web.http.HttpProtocol;

public class StaticViewResolver implements ViewResolver {
    protected static final IOHelper io = new IOHelper();
    protected String contentType = HttpProtocol.CT_APPLICATION_OCTET_STREAM;
    protected boolean cache = false;

    public View resolveViewName(String viewName, Locale locale) throws Exception {
        URL url = resolve(viewName, locale);
        if (url == null) {
            return null;
        } else {
            if (cache) {
                View cv = findCachedView(url);
                if (cv != null) {
                    return cv;
                }
            }
            final byte[] barr = io.readAndClose(url.openStream());
            View v = new View() {
                public void render(Map<String, ?> model, HttpServletRequest request, HttpServletResponse response)
                        throws Exception {
                    response.setContentLength(barr.length);
                    response.setContentType(contentType);
                    OutputStream os = response.getOutputStream();
                    os.write(barr);
                    os.flush();
                }

                public String getContentType() {
                    return contentType;
                }
            };
            if (cache) {
                storeCachedView(url, v);
            }
            return v;
        }
    }

    private Map<URL, View> viewCache = new HashMap<URL, View>();

    protected void storeCachedView(URL url, View v) {
        viewCache.put(url, v);
    }

    protected View findCachedView(URL url) {
        return viewCache.get(url);
    }

    protected String suffix = "";

    protected URL resolve(String viewName, Locale locale) throws IOException {
        if (!viewName.endsWith(suffix)) {
            return null;
        }
        return new URL(viewName);
    }

    public void setContentType(String contentType) {
        this.contentType = contentType;
    }

    public void setCache(boolean cache) {
        this.cache = cache;
    }

    public void setSuffix(String suffix) {
        this.suffix = suffix;
    }

}