code: // ASM: a very small and fast Java bytecode manipulation framework
  // Copyright (c) 2000-2011 INRIA, France Telecom
  // All rights reserved.
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions
  // are met:
  // 1. Redistributions of source code must retain the above copyright
  //    notice, this list of conditions and the following disclaimer.
  // 2. Redistributions in binary form must reproduce the above copyright
  //    notice, this list of conditions and the following disclaimer in the
  //    documentation and/or other materials provided with the distribution.
  // 3. Neither the name of the copyright holders nor the names of its
  //    contributors may be used to endorse or promote products derived from
  //    this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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  // THE POSSIBILITY OF SUCH DAMAGE.
  package clojure.asm.commons;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import clojure.asm.Type;
  
  /**
   * A named method descriptor.
   *
   * @author Juozas Baliuka
   * @author Chris Nokleberg
   * @author Eric Bruneton
   */
  public class Method {
  
    /** The method name. */
    private final String name;
  
    /** The method descriptor. */
    private final String descriptor;
  
    /** The descriptors of the primitive Java types (plus void). */
    private static final Map<String, String> PRIMITIVE_TYPE_DESCRIPTORS;
  
    static {
      HashMap<String, String> descriptors = new HashMap<String, String>();
      descriptors.put("void", "V");
      descriptors.put("byte", "B");
      descriptors.put("char", "C");
      descriptors.put("double", "D");
      descriptors.put("float", "F");
      descriptors.put("int", "I");
      descriptors.put("long", "J");
      descriptors.put("short", "S");
      descriptors.put("boolean", "Z");
      PRIMITIVE_TYPE_DESCRIPTORS = descriptors;
    }
  
    /**
     * Constructs a new {@link Method}.
     *
     * @param name the method's name.
     * @param descriptor the method's descriptor.
     */
    public Method(final String name, final String descriptor) {
      this.name = name;
      this.descriptor = descriptor;
    }
  
    /**
     * Constructs a new {@link Method}.
     *
     * @param name the method's name.
     * @param returnType the method's return type.
     * @param argumentTypes the method's argument types.
     */
    public Method(final String name, final Type returnType, final Type[] argumentTypes) {
      this(name, Type.getMethodDescriptor(returnType, argumentTypes));
    }
  
    /**
     * Creates a new {@link Method}.
     *
     * @param method a java.lang.reflect method descriptor
     * @return a {@link Method} corresponding to the given Java method declaration.
     */
    public static Method getMethod(final java.lang.reflect.Method method) {
      return new Method(method.getName(), Type.getMethodDescriptor(method));
    }
  
    /**
     * Creates a new {@link Method}.
     *
     * @param constructor a java.lang.reflect constructor descriptor
     * @return a {@link Method} corresponding to the given Java constructor declaration.
     */
    public static Method getMethod(final java.lang.reflect.Constructor<?> constructor) {
      return new Method("<init>", Type.getConstructorDescriptor(constructor));
    }
  
    /**
     * Returns a {@link Method} corresponding to the given Java method declaration.
     *
     * @param method a Java method declaration, without argument names, of the form "returnType name
     *     (argumentType1, ... argumentTypeN)", where the types are in plain Java (e.g. "int",
     *     "float", "java.util.List", ...). Classes of the java.lang package can be specified by their
     *     unqualified name; all other classes names must be fully qualified.
     * @return a {@link Method} corresponding to the given Java method declaration.
     * @throws IllegalArgumentException if <code>method</code> could not get parsed.
     */
    public static Method getMethod(final String method) {
      return getMethod(method, false);
    }
  
    /**
     * Returns a {@link Method} corresponding to the given Java method declaration.
     *
     * @param method a Java method declaration, without argument names, of the form "returnType name
     *     (argumentType1, ... argumentTypeN)", where the types are in plain Java (e.g. "int",
     *     "float", "java.util.List", ...). Classes of the java.lang package may be specified by their
     *     unqualified name, depending on the defaultPackage argument; all other classes names must be
     *     fully qualified.
     * @param defaultPackage true if unqualified class names belong to the default package, or false
     *     if they correspond to java.lang classes. For instance "Object" means "Object" if this
     *     option is true, or "java.lang.Object" otherwise.
     * @return a {@link Method} corresponding to the given Java method declaration.
     * @throws IllegalArgumentException if <code>method</code> could not get parsed.
     */
    public static Method getMethod(final String method, final boolean defaultPackage) {
      int spaceIndex = method.indexOf(' ');
      int currentArgumentStartIndex = method.indexOf('(', spaceIndex) + 1;
      int endIndex = method.indexOf(')', currentArgumentStartIndex);
      if (spaceIndex == -1 || currentArgumentStartIndex == 0 || endIndex == -1) {
        throw new IllegalArgumentException();
      }
      String returnType = method.substring(0, spaceIndex);
      String methodName = method.substring(spaceIndex + 1, currentArgumentStartIndex - 1).trim();
      StringBuilder stringBuilder = new StringBuilder();
      stringBuilder.append('(');
      int currentArgumentEndIndex;
      do {
        String argumentDescriptor;
        currentArgumentEndIndex = method.indexOf(',', currentArgumentStartIndex);
        if (currentArgumentEndIndex == -1) {
          argumentDescriptor =
              getDescriptor(
                  method.substring(currentArgumentStartIndex, endIndex).trim(), defaultPackage);
        } else {
          argumentDescriptor =
              getDescriptor(
                  method.substring(currentArgumentStartIndex, currentArgumentEndIndex).trim(),
                  defaultPackage);
          currentArgumentStartIndex = currentArgumentEndIndex + 1;
        }
        stringBuilder.append(argumentDescriptor);
      } while (currentArgumentEndIndex != -1);
      stringBuilder.append(')');
      stringBuilder.append(getDescriptor(returnType, defaultPackage));
      return new Method(methodName, stringBuilder.toString());
    }
  
    /**
     * Returns the descriptor corresponding to the given type name.
     *
     * @param type a Java type name.
     * @param defaultPackage true if unqualified class names belong to the default package, or false
     *     if they correspond to java.lang classes. For instance "Object" means "Object" if this
     *     option is true, or "java.lang.Object" otherwise.
     * @return the descriptor corresponding to the given type name.
     */
    private static String getDescriptor(final String type, final boolean defaultPackage) {
      if ("".equals(type)) {
        return type;
      }
  
      StringBuilder stringBuilder = new StringBuilder();
      int arrayBracketsIndex = 0;
      while ((arrayBracketsIndex = type.indexOf("[]", arrayBracketsIndex) + 1) > 0) {
        stringBuilder.append('[');
      }
  
      String elementType = type.substring(0, type.length() - stringBuilder.length() * 2);
      String descriptor = PRIMITIVE_TYPE_DESCRIPTORS.get(elementType);
      if (descriptor != null) {
        stringBuilder.append(descriptor);
      } else {
        stringBuilder.append('L');
        if (elementType.indexOf('.') < 0) {
          if (!defaultPackage) {
            stringBuilder.append("java/lang/");
          }
          stringBuilder.append(elementType);
        } else {
          stringBuilder.append(elementType.replace('.', '/'));
        }
        stringBuilder.append(';');
      }
      return stringBuilder.toString();
    }
  
    /**
     * Returns the name of the method described by this object.
     *
     * @return the name of the method described by this object.
     */
    public String getName() {
      return name;
    }
  
    /**
     * Returns the descriptor of the method described by this object.
     *
     * @return the descriptor of the method described by this object.
     */
    public String getDescriptor() {
      return descriptor;
    }
  
    /**
     * Returns the return type of the method described by this object.
     *
     * @return the return type of the method described by this object.
     */
    public Type getReturnType() {
      return Type.getReturnType(descriptor);
    }
  
    /**
     * Returns the argument types of the method described by this object.
     *
     * @return the argument types of the method described by this object.
     */
    public Type[] getArgumentTypes() {
      return Type.getArgumentTypes(descriptor);
    }
  
    @Override
    public String toString() {
      return name + descriptor;
    }
  
    @Override
    public boolean equals(final Object other) {
      if (!(other instanceof Method)) {
        return false;
      }
      Method otherMethod = (Method) other;
      return name.equals(otherMethod.name) && descriptor.equals(otherMethod.descriptor);
    }
  
    @Override
    public int hashCode() {
      return name.hashCode() ^ descriptor.hashCode();
    }
  }
  