org.sakaiproject.nakamura.docproxy.disk.DiskDocumentResult.java Source code

Introduction

Here is the source code for org.sakaiproject.nakamura.docproxy.disk.DiskDocumentResult.java

Source

/**
 * Licensed to the Sakai Foundation (SF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The SF licenses this file
 * to you 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 org.sakaiproject.nakamura.docproxy.disk;

import org.apache.commons.logging.Log;
import org.apache.sling.commons.json.JSONObject;
import org.sakaiproject.nakamura.api.docproxy.DocProxyException;
import org.sakaiproject.nakamura.api.docproxy.ExternalDocumentResult;
import org.sakaiproject.nakamura.util.IOUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import javax.activation.MimetypesFileTypeMap;

/**
 *
 */
public class DiskDocumentResult implements ExternalDocumentResult {

    private File file;

    public DiskDocumentResult(File file) {
        this.file = file;
    }

    /**
     * 
     * {@inheritDoc}
     * 
     * @see org.sakaiproject.nakamura.api.docproxy.ExternalDocumentResult#getDocumentInputStream(long)
     */
    public InputStream getDocumentInputStream(long startingAt, String userId) throws DocProxyException {
        FileInputStream in = null;
        try {
            in = new FileInputStream(file);
            in.skip(startingAt);
            return in;
        } catch (FileNotFoundException e) {
            return null;
        } catch (IOException e) {
            try {
                in.close();
            } catch (IOException e1) {
                return null;
            }
            return null;
        }
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.sakaiproject.kernel.api.docproxy.ExternalDocumentResultMetadata#getContentLength()
     */
    public long getContentLength() {
        return file.length();
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.sakaiproject.kernel.api.docproxy.ExternalDocumentResultMetadata#getContentType()
     */
    public String getContentType() {
        MimetypesFileTypeMap map = new MimetypesFileTypeMap();
        return map.getContentType(file);
    }

    /**
     * 
     * {@inheritDoc}
     * 
     * @see org.sakaiproject.nakamura.api.docproxy.ExternalDocumentResultMetadata#getProperties()
     */
    public Map<String, Object> getProperties() throws DocProxyException {
        // We assume that there is a .json file for each file
        String jsonFile = file.getAbsolutePath() + ".json";
        Map<String, Object> props = new HashMap<String, Object>();
        File f = new File(jsonFile);
        if (f.exists()) {
            // We have some properties..
            try {
                FileInputStream stream = new FileInputStream(f);
                String jsonString = IOUtils.readFully(stream, "UTF-8");
                JSONObject o = new JSONObject(jsonString);
                Iterator<String> keys = o.keys();
                while (keys.hasNext()) {
                    String key = keys.next();
                    props.put(key, o.get(key));
                }

            } catch (Exception e) {
                // Swallow all exceptions and throw one of our own.
                throw new DocProxyException(500, "Unable to retrieve properties for file.");
            }

        }

        // no properties, return empty map
        return props;
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.sakaiproject.kernel.api.docproxy.ExternalDocumentResultMetadata#getType()
     */
    public String getType() {
        return DiskProcessor.TYPE;
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.sakaiproject.kernel.api.docproxy.ExternalDocumentResultMetadata#getUri()
     */
    public String getUri() {
        return file.toURI().toString();
    }

}