Application: gvSIG desktop

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package org.gvsig.fmap.dal.store.gml.simplereaders;

import java.io.File;

import java.io.IOException;

import java.io.Reader;

import java.nio.charset.Charset;

import java.util.List;

import org.apache.commons.io.FilenameUtils;

import org.apache.commons.io.IOUtils;

import org.cresques.cts.IProjection;

import org.gvsig.fmap.crs.CRSFactory;

import org.gvsig.fmap.dal.store.gml.virtualrows.GfsFile;

import org.gvsig.fmap.dal.store.gml.virtualrows.XMLFileAsList;

import org.gvsig.fmap.dal.store.simplereader.SimpleReaderStoreParameters;

import org.gvsig.fmap.dal.store.simplereader.simplereaders.AbstractSimpleReader;

import org.gvsig.tools.task.SimpleTaskStatus;

import org.gvsig.tools.util.GetItemWithSize64;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 *

 * @author gvSIG Team

 */

public class GMLReader extends AbstractSimpleReader {

    private static final Logger LOGGER = LoggerFactory.getLogger(GMLReader.class);

    private XMLFileAsList gml;

    private int columns;

    private String[] header;

    private int currentElement = 0;

    private final SimpleReaderStoreParameters parameters;

    private GfsFile gfs;

    public GMLReader(Reader reader, SimpleReaderStoreParameters theParameters) throws IOException {

        File gmlFile = theParameters.getFile();

        File gmlIdx = new File(FilenameUtils.removeExtension(gmlFile.getAbsolutePath())+".gmlidx");

        File gfsFile = new File(FilenameUtils.removeExtension(gmlFile.getAbsolutePath())+".gfs");

        gfs = new GfsFile();

        if(gfsFile.exists()){

            //TODO: Comparar fechas del gfs y gml

            gfs.load(gfsFile);

        } else {

            gfs.fetch(gmlFile);

            gfs.save(gfsFile);

        }

        this.gml = null;

        this.columns = -1;

        this.header = null;

        this.parameters = theParameters;

    }

    private XMLFileAsList getGml(){

        if(this.gml == null){

            this.gml = (XMLFileAsList) this.getVirtualRows(SimpleTaskStatus.FAKE_STATUS);

        }

        return this.gml;

    }

    @Override

    public String[] getHeader() throws IOException {

        if (this.header == null) {

            List<String> geoms = gfs.getGeometryElementPaths();

            String[] theHeader = new String[gfs.size()+(geoms==null?0:geoms.size())];

            int i = 0;

            for (GfsFile.PropertyDefn item : gfs) {

                theHeader[i++] = item.getName();

            }

            if(geoms != null) {

                List<String> srss = gfs.getGeometryElementSrss();

                for (int j = 0; j < geoms.size(); j++) {

                    IProjection srs = CRSFactory.getCRS(srss.get(j));

                    if(srs == null){

                        theHeader[i++] = FilenameUtils.getBaseName(geoms.get(j));

                    } else {

                        theHeader[i++] = FilenameUtils.getBaseName(geoms.get(j))+"/Geometry/set/srs="+srs.getAbrev().replace(":", "@");

                    }

                }

            }

            this.header = theHeader;

        }

        return this.header;

    }

    @Override

    public int getColumnsCount() throws IOException {

        if (this.columns <= 0) {

            this.columns = this.getHeader().length;

        }

        return this.columns;

    }

    @Override

    public List<String> read() throws IOException {

        List<String> values = this.read(currentElement);

        if (values == null) {

            return null;

        }

        currentElement += 1;

        return values;

    }

    public List<String> read(int rowNumber) throws IOException {

        if (rowNumber < this.getGml().size64()) {

            List<String> values = this.getGml().get64(rowNumber);

            return values;

        }

        return null;

    }

    @Override

    public void close() throws IOException {

        IOUtils.closeQuietly(this.gml);

        this.gml = null;

        this.gfs = null;

    }

    @Override

    public List<String> skip(int lines) throws IOException {

        this.currentElement += lines;

        if (this.currentElement > this.getGml().size64()) {

            return null;

        }

        return read(this.currentElement);

    }

    @Override

    public int getLine() {

        if (this.getGml() == null) {

            return 0;

        }

        return this.currentElement;

    }

    @Override

    public List<String> nextRowValues() {

        try {

            return this.read();

        } catch (IOException ex) {

            throw new RuntimeException(ex);

        }

    }

    @Override

    public GetItemWithSize64<List<String>> getVirtualRows(SimpleTaskStatus status) {

        try {

            File gmlFile = this.parameters.getFile();

            File gmlIdx = new File(FilenameUtils.removeExtension(gmlFile.getAbsolutePath()) + ".gmlidx");

            XMLFileAsList x = new XMLFileAsList(

                gmlFile,

                gmlIdx,

                Charset.forName(SimpleReaderStoreParameters.getCharset(this.parameters)),

                gfs.getBaseElementPath(),

                gfs.getGeometryElementPaths(),

                gfs.getPropertiesPaths()

            );

            return x;

        } catch (IOException ex) {

            throw new RuntimeException("Can't get virtual rows", ex);

        }

    }

}