svn-gvsig-desktop / tags / v1_1_Build_1014 / libraries / libDriverManager / src / com / hardcode / driverManager / WriterManager.java @ 13593
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package com.hardcode.driverManager; |
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import java.io.File; |
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import java.io.IOException; |
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import java.net.MalformedURLException; |
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import java.net.URL; |
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import java.util.ArrayList; |
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import java.util.HashMap; |
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import java.util.Iterator; |
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/**
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* Para el writer manager, el writer viene determinado por un directorio dentro
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* del cual se encuentran uno o m?s jar's. La clase Writer ha de implementar
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* la interfaz Writer y su nombre debe terminar en "Writer" y tener un
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* constructor sin par?metros.
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*
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* <p>
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* Esta clase es la encargada de la carga y validaci?n de los writers y de la
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* obtenci?n de los mismo apartir de un tipo
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* </p>
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*
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* @author Vicente Caballero Navarro
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*/
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public class WriterManager { |
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private DriverValidation validation;
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private HashMap nombreWriterClass = new HashMap(); |
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private ArrayList failures = new ArrayList(); |
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/**
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* Devuelve un array con los directorios de los plugins
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*
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* @param dirExt Directorio a partir del que se cuelgan los directorios de
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* los drivers
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*
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* @return Array de los subdirectorios
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*/
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private File[] getPluginDirs(File dirExt) { |
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if (!dirExt.exists()) {
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return new File[0]; |
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} |
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ArrayList ret = new ArrayList(); |
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File[] files = dirExt.listFiles(); |
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for (int i = 0; i < files.length; i++) { |
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if (files[i].isDirectory()) {
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ret.add(files[i]); |
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} |
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} |
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return (File[]) ret.toArray(new File[0]); |
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} |
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/**
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* Obtiene los jar's de un directorio y los devuelve en un array
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*
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* @param dir Directorio del que se quieren obtener los jars
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*
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* @return Array de jars
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*/
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private URL[] getJars(File dir) { |
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ArrayList ret = new ArrayList(); |
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File[] dirContent = dir.listFiles(); |
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for (int i = 0; i < dirContent.length; i++) { |
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if (dirContent[i].getName().toLowerCase().endsWith(".jar")) { |
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try {
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ret.add(new URL("file:" + dirContent[i].getAbsolutePath())); |
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} catch (MalformedURLException e) { |
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//No se puede dar
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} |
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} |
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} |
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return (URL[]) ret.toArray(new URL[0]); |
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} |
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/**
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* Carga los drivers y asocia con el tipo del driver.
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*
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* @param dir Directorio ra?z de los drivers
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*/
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public void loadWriters(File dir) { |
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try {
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if (validation == null) { |
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validation = new DriverValidation() {
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public boolean validate(Driver d) { |
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return true; |
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} |
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}; |
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} |
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//Se obtiene la lista de directorios
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File[] dirs = getPluginDirs(dir); |
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//Para cada directorio se obtienen todos sus jars
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for (int i = 0; i < dirs.length; i++) { |
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URL[] jars = getJars(dirs[i]); |
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//Se crea el classloader
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DriverClassLoader cl = new DriverClassLoader(jars,
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dirs[i].getAbsolutePath(), |
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this.getClass().getClassLoader());
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//Se obtienen los drivers
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Class[] writers = cl.getWriters(); |
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//Se asocian los drivers con su tipo si superan la validaci?n
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for (int j = 0; j < writers.length; j++) { |
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try {
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Driver driver = (Driver) writers[j].newInstance(); |
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if (validation.validate(driver)) {
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if (nombreWriterClass.put(driver.getName(),
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writers[j]) != null) {
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throw new IllegalStateException( |
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"Two drivers with the same name");
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} |
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} |
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} catch (ClassCastException e) { |
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/*
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* No todos los que terminan en Driver son drivers
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* de los nuestros, los ignoramos
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*/
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} catch (Throwable t) { |
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/*
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* A?n a riesgo de capturar algo que no debemos, ignoramos cualquier driver que pueda
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* dar cualquier tipo de problema, pero continuamos
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*/
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failures.add(t); |
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} |
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} |
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} |
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} catch (ClassNotFoundException e) { |
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failures.add((Throwable) e);
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} catch (IOException e) { |
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failures.add((Throwable) e);
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} |
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} |
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/**
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* DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*/
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public Throwable[] getLoadFailures() { |
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return (Throwable[]) failures.toArray(new Throwable[0]); |
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} |
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/**
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* Obtiene el Writer asociado al tipo que se le pasa como par?metro
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*
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* @param name Objeto que devolvi? alguno de los writers en su m?todo
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* getType
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*
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* @return El writer asociado o null si no se encuentra el driver
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*
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* @throws DriverLoadException if this Class represents an abstract class,
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* an interface, an array class, a primitive type, or void; or if
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* the class has no nullary constructor; or if the instantiation
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* fails for some other reason
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*/
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public Driver getWriter(String name) throws DriverLoadException { |
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try {
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Class driverClass = (Class) nombreWriterClass.get(name); |
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if (driverClass == null) throw new DriverLoadException("No se encontr? el writer: " + name); |
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return (Driver) driverClass.newInstance(); |
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} catch (InstantiationException e) { |
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throw new DriverLoadException(e); |
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} catch (IllegalAccessException e) { |
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throw new DriverLoadException(e); |
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} |
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} |
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/**
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* Establece el objeto validador de los drivers. En la carga se comprobar?
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* si cada driver es v?lido mediante el m?todo validate del objeto
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* validation establecido con este m?todo. Pro defecto se validan todos
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* los drivers
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*
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* @param validation objeto validador
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*/
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public void setValidation(DriverValidation validation) { |
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this.validation = validation;
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} |
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/**
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* Obtiene los tipos de todos los writers del sistema
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*
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* @return DOCUMENT ME!
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*/
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public String[] getWriterNames() { |
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ArrayList names = new ArrayList(nombreWriterClass.size()); |
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Iterator iterator = nombreWriterClass.keySet().iterator();
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while (iterator.hasNext()) {
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names.add((String) iterator.next());
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} |
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return (String[]) names.toArray(new String[0]); |
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} |
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/**
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* Obtiene la clase del writer relacionado con el tipo que se pasa como
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* par?metro
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*
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* @param driverName DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*/
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public Class getWriterClassByName(String writerName) { |
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return (Class) nombreWriterClass.get(writerName); |
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} |
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/**
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* DOCUMENT ME!
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*
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* @param writerName DOCUMENT ME!
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* @param superClass DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*
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* @throws RuntimeException DOCUMENT ME!
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*/
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public boolean isA(String writerName, Class superClass) { |
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Class writerClass = (Class) nombreWriterClass.get(writerName); |
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if (writerClass == null) { |
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throw new RuntimeException("No such driver"); |
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} |
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Class[] interfaces = writerClass.getInterfaces(); |
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if (interfaces != null) { |
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for (int i = 0; i < interfaces.length; i++) { |
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if (interfaces[i] == superClass) {
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return true; |
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} else {
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if (recursiveIsA(interfaces[i], superClass)) {
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return true; |
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} |
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} |
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} |
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} |
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Class class_ = writerClass.getSuperclass();
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if (class_ != null) { |
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if (class_ == superClass) {
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return true; |
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} else {
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if (recursiveIsA(class_, superClass)) {
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return true; |
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} |
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} |
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} |
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return false; |
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} |
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/**
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* DOCUMENT ME!
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*
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* @param interface_ DOCUMENT ME!
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* @param superInterface DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*/
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private boolean recursiveIsA(Class interface_, Class superInterface) { |
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Class[] interfaces = interface_.getInterfaces(); |
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if (interfaces != null) { |
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for (int i = 0; i < interfaces.length; i++) { |
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if (interfaces[i] == superInterface) {
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return true; |
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} else {
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if (recursiveIsA(interfaces[i], superInterface)) {
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return true; |
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} |
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} |
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} |
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} |
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Class class_ = interface_.getSuperclass();
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if (class_ != null) { |
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if (class_ == superInterface) {
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return true; |
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} else {
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if (recursiveIsA(class_, superInterface)) {
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return true; |
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} |
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} |
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} |
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return false; |
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} |
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} |