/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jetbrains.java.decompiler.struct.gen;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class MethodDescriptor {

  public VarType[] params;

  public VarType ret;


  public static MethodDescriptor parseDescriptor(String mdescr) {

    MethodDescriptor md = new MethodDescriptor();

    List<String> lst = new ArrayList<String>();
    String[] pars = mdescr.split("[()]");

    String par = pars[1];

    int indexFrom = -1, ind, index = 0;
    int len = par.length();

    for (; index < len; index++) {

      switch (par.charAt(index)) {
        case '[':
          if (indexFrom < 0) {
            indexFrom = index;
          }
          break;
        case 'L':
          ind = par.indexOf(";", index);
          lst.add(par.substring(indexFrom < 0 ? index : indexFrom, ind + 1));
          index = ind;
          indexFrom = -1;
          break;
        default:
          lst.add(par.substring(indexFrom < 0 ? index : indexFrom, index + 1));
          indexFrom = -1;
      }
    }

    lst.add(pars[2]);


    md.params = new VarType[lst.size() - 1];

    int i = 0;
    for (; i < lst.size() - 1; i++) {
      md.params[i] = new VarType(lst.get(i));
    }
    md.ret = new VarType(lst.get(i));

    return md;
  }

  public String getDescriptor() {
    String res = "(";

    for (int j = 0; j < params.length; j++) {
      res += params[j].toString();
    }

    res += ")" + ret.toString();

    return res;
  }

  @Override
  public boolean equals(Object o) {
    if (o == this) return true;
    if (o == null || !(o instanceof MethodDescriptor)) return false;

    MethodDescriptor md = (MethodDescriptor)o;
    return ret.equals(md.ret) && Arrays.equals(params, md.params);
  }

  @Override
  public int hashCode() {
    int result = ret.hashCode();
    result = 31 * result + params.length;
    return result;
  }
}