ucar.nc2.util.reflect.ProxyGenerator Maven / Gradle / Ivy

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/*
 * Copyright 1998-2009 University Corporation for Atmospheric Research/Unidata
 *
 * Portions of this software were developed by the Unidata Program at the
 * University Corporation for Atmospheric Research.
 *
 * Access and use of this software shall impose the following obligations
 * and understandings on the user. The user is granted the right, without
 * any fee or cost, to use, copy, modify, alter, enhance and distribute
 * this software, and any derivative works thereof, and its supporting
 * documentation for any purpose whatsoever, provided that this entire
 * notice appears in all copies of the software, derivative works and
 * supporting documentation.  Further, UCAR requests that the user credit
 * UCAR/Unidata in any publications that result from the use of this
 * software or in any product that includes this software. The names UCAR
 * and/or Unidata, however, may not be used in any advertising or publicity
 * to endorse or promote any products or commercial entity unless specific
 * written permission is obtained from UCAR/Unidata. The user also
 * understands that UCAR/Unidata is not obligated to provide the user with
 * any support, consulting, training or assistance of any kind with regard
 * to the use, operation and performance of this software nor to provide
 * the user with any updates, revisions, new versions or "bug fixes."
 *
 * THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
 */
package ucar.nc2.util.reflect;

import java.lang.reflect.*;
import java.io.*;
import java.util.*;

public class ProxyGenerator {

  static void generate(Class c, PrintStream out) throws SecurityException {

    String proxyName = c.getName() + "Proxy";

    out.println();
    out.println("public class " + proxyName + " extends " + c.getName() + "{");
    out.println("  private " + c.getName() + " proxy;\n");
    out.println("  public " + proxyName + " ( " + c.getName() + " proxy) {");
    out.println("    this.proxy = proxy;");
    out.println("  }\n");

    ArrayList allMethods = new ArrayList();
    addAllMethods(allMethods, c);
    Collections.sort(allMethods, new MethodComparator());
    for (int i = 0; i < allMethods.size(); i++) {
      genMethod((Method) allMethods.get(i), out);
    }

    out.println("}");
  }

  private static void addAllMethods(ArrayList allMethods, Class c) {
    if (c == null) return;
    if (c == Object.class) return;
    Method[] methodsArray = c.getDeclaredMethods();
    allMethods.addAll(Arrays.asList(methodsArray));

    addAllMethods(allMethods, c.getSuperclass());
  }

  static void genMethod(Method m, PrintStream out) throws SecurityException {
    int mods = m.getModifiers();
    if (Modifier.isFinal(mods) || Modifier.isPrivate(mods) || Modifier.isStatic(mods))
      return;

    out.print("  " + Modifier.toString(mods));
    out.print(" " + m.getReturnType().getName());
    out.print(" " + m.getName() + "(");

    Class[] params = m.getParameterTypes();
    for (int i = 0; i < params.length; i++) {
      if (i > 0) out.print(", ");
      out.print(makeClassName(params[i]) + " p" + i);
    }
    out.print(")");

    Class[] ex = m.getExceptionTypes();
    if (ex.length > 0) {
      out.print(" throws ");
      for (int i = 0; i < ex.length; i++) {
        if (i > 0) out.print(", ");
        out.print(ex[i].getName());
      }
    }

    out.println(" {");

    out.print("    ");
    if (!m.getReturnType().getName().equals("void"))
      out.print("return ");

    out.print("proxy." + m.getName() + "(");
    for (int i = 0; i < params.length; i++) {
      if (i > 0) out.print(",");
      out.print(" p" + i);
    }
    out.println(");");
    out.println("  }\n");
  }

  static String makeClassName(Class c) {
    if (c.isArray()) {
      return makeClassName(c.getComponentType()) + "[]";
    }
    return c.getName();
  }

  public static class MethodComparator implements java.util.Comparator {
    public int compare(Object o1, Object o2) {
      Method t1 = (Method) o1;
      Method t2 = (Method) o2;
      return t1.getName().compareTo(t2.getName());
    }

    public boolean equals(Object obj) {
      return obj == this;
    }
  }

  static public void showMethods(Class c, PrintStream out) {

    out.println("Methods for class " + c.getName());

    Method[] methodsArray = c.getDeclaredMethods();

    for (int i = 0; i < methodsArray.length; i++) {
      Method m = methodsArray[i];
      System.out.println(" " + m.getName());
    }
  }


  public static void main(String[] args) throws SecurityException {
    generate(thredds.catalog.InvDatasetImpl.class, System.out);
  }

}