/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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.apache.geode.codeAnalysis.decode;

import java.io.DataInputStream;
import java.io.IOException;

import org.apache.geode.codeAnalysis.decode.cp.CpUtf8;


public class CompiledField implements Comparable {
  int access_flags;
  int name_index;
  int descriptor_index;
  int attributes_count;
  // only the ConstantValue attribute is defined for fields
  CompiledAttribute[] attributes;
  String name;
  String descriptor;
  String accessString;
  String signature;
  CompiledClass myclass;

  CompiledField(DataInputStream source, CompiledClass myclass) throws IOException {
    int idx;

    this.myclass = myclass; // may not be fully initialized at this point
    access_flags = source.readUnsignedShort();
    name_index = source.readUnsignedShort();
    descriptor_index = source.readUnsignedShort();
    attributes_count = source.readUnsignedShort();
    attributes = new CompiledAttribute[attributes_count];
    for (idx = 0; idx < attributes_count; idx++) {
      attributes[idx] = new CompiledAttribute(source);
    }
  }

  /*
   * return a string describing the access modifiers for this class
   */
  public String accessString() {
    StringBuilder result;

    if (accessString != null) {
      return accessString;
    }
    result = new StringBuilder();
    if ((access_flags & 0x0001) != 0) {
      result.append("public ");
    }
    if ((access_flags & 0x0002) != 0) {
      result.append("private ");
    }
    if ((access_flags & 0x0004) != 0) {
      result.append("protected ");
    }
    if ((access_flags & 0x0008) != 0) {
      result.append("static ");
    }
    if ((access_flags & 0x0010) != 0) {
      result.append("final ");
    }
    if ((access_flags & 0x0040) != 0) {
      result.append("volatile ");
    }
    if ((access_flags & 0x0080) != 0) {
      result.append("transient ");
    }

    accessString = result.toString();
    return accessString;
  }

  public boolean isStatic() {
    return (access_flags & 0x8) != 0;
  }

  public boolean isTransient() {
    return (access_flags & 0x80) != 0;
  }

  /*
   * the descriptor is just the type string for the field
   */
  public String descriptor() {
    if (descriptor == null) {
      descriptor = ((CpUtf8) myclass.constant_pool[descriptor_index]).decodeClassName(0);
    }
    return descriptor;
  }

  public String name() {
    if (name == null) {
      name = ((CpUtf8) myclass.constant_pool[name_index]).stringValue();
    }
    return name;
  }

  public String signature() {
    if (signature == null) {
      signature = accessString() + descriptor() + " " + name() + ";";
    }
    return signature;
  }

  @Override
  public int compareTo(Object other) {
    if (this == other) {
      return 0;
    }
    CompiledField otherField = (CompiledField) (other);
    return name().compareTo(otherField.name);
  }
}
