root / trunk / libraries / libRaster / src / org / gvsig / raster / dataset / io / rmf / RmfBlocksManager.java @ 21799
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2007 IVER T.I. and Generalitat Valenciana.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*/
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package org.gvsig.raster.dataset.io.rmf; |
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import java.io.BufferedReader; |
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import java.io.File; |
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import java.io.FileInputStream; |
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import java.io.FileNotFoundException; |
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import java.io.FileWriter; |
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import java.io.IOException; |
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import java.io.InputStreamReader; |
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import java.util.ArrayList; |
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import org.gvsig.raster.util.RasterUtilities; |
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/**
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* Gestor para la escritura de bloques XML en el fichero RMF. Cada cliente que quiere
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* escribir en el se registrar? a traves de ClientRegister y esta clase ser? la encargada
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* de gestionar la lectura y escritura de bloques.
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*
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* 21-abr-2007
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* @author Nacho Brodin (nachobrodin@gmail.com)
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*/
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public class RmfBlocksManager extends ClientRegister implements IRmfBlock { |
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private final String MAIN_TAG = "RasterMetaFile"; |
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private String path = null; |
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/**
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* Constructor. Asigna la ruta del fichero.
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* @param path
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*/
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public RmfBlocksManager(String path) { |
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setPath(path); |
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} |
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/**
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* Asigna la ruta del fichero
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* @param path
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*/
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public void setPath(String path) { |
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this.path = path;
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} |
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/**
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* Obtiene la ruta del fichero
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* @return path
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*/
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public String getPath() { |
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return path;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.dataset.io.rmf.IRmfBlock#read(java.lang.String)
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*/
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public void read(String xml) throws ParsingException { |
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File file = new File(getPath()); |
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ArrayList lines = new ArrayList(); |
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BufferedReader inGrf = null; |
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try {
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inGrf = new BufferedReader(new InputStreamReader(new FileInputStream(file))); |
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String str = inGrf.readLine();
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while (str != null) { |
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for (int i = 0; i < clients.size(); i++) { |
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IRmfBlock block = ((IRmfBlock) clients.get(i)); |
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String main = block.getMainTag();
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if (str.startsWith("<" + main)) { |
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lines.clear(); |
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while (str.compareTo("</" + main + ">") != 0) { |
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lines.add(str); |
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str = inGrf.readLine(); |
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} |
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lines.add(str); |
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StringBuffer buf = new StringBuffer(); |
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for (int j = 0; j < lines.size(); j++) |
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buf.append((String) lines.get(j));
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block.read(buf.toString()); |
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break;
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} |
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} |
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str = inGrf.readLine(); |
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} |
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inGrf.close(); |
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} catch (FileNotFoundException e) { |
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throw new ParsingException("File Input error: creating BufferedReader"); |
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} catch (IOException ex) { |
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throw new ParsingException("File Input error: reading lines"); |
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} |
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} |
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/**
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* Creaci?n de nuevo fichero RMF. A?ade la cabecera y vuelca el contenido de
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* todos los IRmfBlock.
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* @param file Fichero
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* @return true si el fichero no existia y se ha creado nuevo
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* @throws IOException
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*/
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private boolean create(File file) throws IOException { |
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if (!file.exists()) {
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file.createNewFile(); |
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FileWriter writer = new FileWriter(file); |
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writer.write("<?xml version=\"1.0\" encoding=\"ISO-8859-15\"?>\n");
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writer.write("<RasterMetaFile>\n");
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for (int i = 0; i < clients.size(); i++) { |
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IRmfBlock block = ((IRmfBlock) clients.get(i)); |
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writer.write(block.write()); |
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} |
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writer.write("</RasterMetaFile>\n");
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writer.close(); |
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return true; |
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} |
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return false; |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.dataset.io.rmf.IRmfBlock#write()
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*/
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public String write() throws IOException { |
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File file = new File(getPath()); |
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ArrayList lines = new ArrayList(); |
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// Si no existe a?n el rmf se crea, se a?ade las cabeceras y se vuelca el
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// contenido de los bloques
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if (create(file))
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return null; |
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// A?adir bloques al fichero.
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BufferedReader inGrf = new BufferedReader(new InputStreamReader(new FileInputStream(file))); |
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String str = inGrf.readLine();
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while (str != null) { |
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lines.add(str); |
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str = inGrf.readLine(); |
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} |
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// Obtenemos el primer tag de un bloque. Para cada uno recorremos todo el
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// rmf actual buscando ese tag. Si existe se a?ade el nuevo bloque y se
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// borra el viejo. Si no existe lo a?ade al final antes de la etiqueta de
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// cierre </RasterMetaFile>
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for (int i = 0; i < clients.size(); i++) { |
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IRmfBlock block = ((IRmfBlock) clients.get(i)); |
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String tag = block.getMainTag();
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for (int line = 0; line < lines.size(); line++) { |
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str = (String) lines.get(line);
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if (str.compareTo("</" + getMainTag() + ">") == 0 || str.startsWith("<" + tag)) { |
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String xmlBlock = block.write();
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if (line != 0) |
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lines.add(line, xmlBlock); |
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if (str.startsWith("<" + tag)) { |
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while (((String) lines.get(line + 1)).compareTo("</" + tag + ">") != 0) |
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lines.remove(line + 1);
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lines.remove(line + 1);
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} |
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break;
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} |
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} |
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} |
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inGrf.close(); |
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// Escribir fichero de salida.
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file.delete(); |
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file.createNewFile(); |
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FileWriter writer = new FileWriter(file); |
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for (int i = 0; i < lines.size(); i++) { |
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if (((String) lines.get(i)).length() == 0) |
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continue;
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if (!((String) lines.get(i)).endsWith("\n")) |
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writer.write((String) lines.get(i) + "\n"); |
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else
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writer.write((String) lines.get(i));
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} |
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writer.close(); |
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return null; |
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} |
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/**
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* Obtiene un bloque XML que representa a las propiedades del objeto a
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* serializar. Antes de la operaci?n hace una copia de seguridad del fichero
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* RMF.
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* @param rmfBackup Especifica si debe hacer la copia de seguridad.
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* @return Texto XML que representa el objeto.
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*/
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public String write(boolean rmfBackup) throws IOException, FileNotFoundException { |
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if (rmfBackup)
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RasterUtilities.copyFile(getPath(), getPath() + "~");
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return write();
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} |
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/**
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* M?todo que checkea si el fichero pasado es valido para ser rmf. Si existe
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* el fichero ser? valido si se puede escribir en el y no est? vacio y no es
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* un directorio y contiene los caracteres de cabecera de comienzo de XML (<?xml
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* .... >). En caso de que el fichero no exista tambi?n es valido ya que se
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* crear? de cero.
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* @return true si es un rmf valido y false si no lo es
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*/
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public boolean checkRmf() { |
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File f = new File(getPath()); |
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if (f.exists()) {
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if (!f.canWrite() || f.length() == 0 || f.isDirectory()) |
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return false; |
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BufferedReader inGrf;
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try {
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inGrf = new BufferedReader(new InputStreamReader(new FileInputStream(f))); |
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String str = inGrf.readLine();
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if (!str.startsWith("<?xml")) |
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return false; |
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} catch (FileNotFoundException e) { |
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return false; |
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} catch (IOException e) { |
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return false; |
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} |
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} |
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return true; |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.dataset.io.rmf.IRmfBlock#getMainTag()
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*/
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public String getMainTag() { |
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return MAIN_TAG;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.dataset.io.rmf.IRmfBlock#getResult()
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*/
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public Object getResult() { |
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return null; |
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} |
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} |