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

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/*
 * Copyright (c) 1998-2018 John Caron and University Corporation for Atmospheric Research/Unidata
 * See LICENSE for license information.
 */
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.client.catalog.Dataset.class, System.out);
  }

}