edu.cudenver.bios.matrixsvc.resource.MatrixRankResource.java Source code

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Here is the source code for edu.cudenver.bios.matrixsvc.resource.MatrixRankResource.java

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/*
 * Power Service for the GLIMMPSE Software System.  Processes
 * incoming HTTP requests for power, sample size, and detectable
 * difference
 * 
 * Copyright (C) 2010 Regents of the University of Colorado.  
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package edu.cudenver.bios.matrixsvc.resource;

import java.io.IOException;

import org.apache.commons.math.linear.SingularValueDecompositionImpl;
import org.restlet.data.Status;
import org.restlet.ext.xml.DomRepresentation;
import org.restlet.representation.Representation;
import org.restlet.resource.Post;
import org.restlet.resource.ResourceException;
import org.restlet.resource.ServerResource;

import edu.cudenver.bios.matrixsvc.application.MatrixLogger;
import edu.cudenver.bios.matrixsvc.application.NamedRealMatrix;
import edu.cudenver.bios.matrixsvc.representation.RankXmlRepresentation;

/**
 * Resource for handling requests for Matrix Addition calculations.
 * See the MatrixApplication class for URI mappings
 * 
 * @author Jonathan Cohen
 */
public class MatrixRankResource extends ServerResource {

    /**
     * Handle POST request to calculate the rank of a matrix
     * @param entity XMl formatted matrix list
     * @return XML representation of the matrix rank
     * @throws ResourceException
     */
    @Post
    public Representation matrixRank(Representation entity) throws ResourceException {
        if (entity == null) {
            throw new ResourceException(Status.CLIENT_ERROR_BAD_REQUEST,
                    "No Input- Calculation of Matrix Rank not possible");
        }
        DomRepresentation rep = new DomRepresentation(entity);
        NamedRealMatrix reqMatrix = null;

        try {
            // parse the parameters from the entity body
            reqMatrix = MatrixParamParser.getMatrixRankParamsFromDomNode(rep.getDocument().getDocumentElement());

            //perform rank operation and set value in our parameter object
            SingularValueDecompositionImpl impl = new SingularValueDecompositionImpl(reqMatrix);

            //create our response representation
            RankXmlRepresentation response = new RankXmlRepresentation(impl.getRank());
            /* getResponse().setEntity(response); 
             getResponse().setStatus(Status.SUCCESS_CREATED);*/
            return response;
        } catch (IllegalArgumentException iae) {
            MatrixLogger.getInstance().error(iae.getMessage());
            throw new ResourceException(Status.CLIENT_ERROR_BAD_REQUEST, iae.getMessage());

        } catch (IOException ioe) {
            MatrixLogger.getInstance().error(ioe.getMessage());
            throw new ResourceException(Status.CLIENT_ERROR_BAD_REQUEST, ioe.getMessage());

        }
    }
}