org.b3mn.poem.handler.CollectionHandler.java Source code

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Here is the source code for org.b3mn.poem.handler.CollectionHandler.java

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/***************************************
 * Copyright (c) 2008
 * Bjoern Wagner
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
****************************************/

package org.b3mn.poem.handler;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.text.ParseException;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

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

import org.b3mn.poem.Identity;
import org.b3mn.poem.Representation;
import org.b3mn.poem.util.HandlerWithoutModelContext;
import org.json.JSONArray;
import org.json.JSONException;

@HandlerWithoutModelContext(uri = "/model")
public class CollectionHandler extends HandlerBase {

    // Returns a date object representing the input string 
    // TODO: just make it better
    protected Date parseDate(String strDate, boolean set1970OnError) {
        if (strDate != null) {
            try {
                SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
                return formatter.parse(strDate);
            } catch (ParseException e) {
                Calendar c = Calendar.getInstance();
                c.set(1970, 1, 1);
                return c.getTime();
            }
        } else {
            if (set1970OnError) {
                Calendar c = Calendar.getInstance();
                c.set(1970, 1, 1);
                return c.getTime();
            } else {
                Date date = new Date();
                // TODO: Find the damn time bug. You have to add 24h to get all the models. Why ever...
                date.setTime(date.getTime() + 24 * 3600 * 1000);
                return date;
            }
        }
    }

    protected boolean checkParameter(HttpServletRequest req, String parameter) {
        if (req.getParameter(parameter) != null) {
            return req.getParameter(parameter).equals("true");
        } else {
            return false;
        }
    }

    public void doGet(HttpServletRequest req, HttpServletResponse res, Identity subject, Identity object)
            throws IOException {

        Date from = this.parseDate(req.getParameter("from"), true);
        Date to = this.parseDate(req.getParameter("to"), false);

        boolean owner = this.checkParameter(req, "owner");
        boolean is_shared = this.checkParameter(req, "is_shared");
        boolean contributor = this.checkParameter(req, "contributor");
        boolean reader = this.checkParameter(req, "contributor");
        boolean is_public = this.checkParameter(req, "is_public");

        String type = null;
        if (req.getParameter("type") != null) {
            type = req.getParameter("type");
        } else {
            type = "%";
        }

        // Run query
        List<Representation> models = subject.getModels(type, from, to, owner, is_shared, is_public, contributor,
                reader);

        // Collect meta data as json
        JSONArray output = new JSONArray();
        for (Representation model : models) {
            output.put(this.getModelMetaData(subject, Identity.instance(model.getIdent_id()), req));
        }
        // Write json to output stream
        try {
            output.write(res.getWriter());
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    public void doPost(HttpServletRequest req, HttpServletResponse res, Identity subject, Identity object)
            throws IOException {
        Identity identity = Identity.newModel(subject, req.getParameter("title"), req.getParameter("type"),
                req.getParameter("summary"), req.getParameter("svg"), req.getParameter("content"));

        res.setStatus(201); // Http status "created"
        res.setHeader("location", identity.getUri()); // return the model uri to the editor
    }
}