/*
    * 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
    *
   *   https://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.bcel.classfile;
  
  import java.io.DataOutputStream;
  import java.io.IOException;
  
  import org.apache.bcel.Const;
  
  /**
   * Represents a simple element value in an annotation.
   *
   * @since 6.0
   */
  public class SimpleElementValue extends ElementValue {
      private int index;
  
      public SimpleElementValue(final int type, final int index, final ConstantPool cpool) {
          super(type, cpool);
          this.index = index;
      }
  
      @Override
      public void dump(final DataOutputStream dos) throws IOException {
          final int type = super.getType();
          dos.writeByte(type); // u1 kind of value
          switch (type) {
          case PRIMITIVE_INT:
          case PRIMITIVE_BYTE:
          case PRIMITIVE_CHAR:
          case PRIMITIVE_FLOAT:
          case PRIMITIVE_LONG:
          case PRIMITIVE_BOOLEAN:
          case PRIMITIVE_SHORT:
          case PRIMITIVE_DOUBLE:
          case STRING:
              dos.writeShort(getIndex());
              break;
          default:
              throw new ClassFormatException("SimpleElementValue doesn't know how to write out type " + type);
          }
      }
  
      /**
       * @return Value entry index in the constant pool.
       */
      public int getIndex() {
          return index;
      }
  
      public boolean getValueBoolean() {
          if (super.getType() != PRIMITIVE_BOOLEAN) {
              throw new IllegalStateException("Don't call getValueBoolean() on a non BOOLEAN ElementValue");
          }
          final ConstantInteger bo = (ConstantInteger) super.getConstantPool().getConstant(getIndex());
          return bo.getBytes() != 0;
      }
  
      public byte getValueByte() {
          if (super.getType() != PRIMITIVE_BYTE) {
              throw new IllegalStateException("Don't call getValueByte() on a non BYTE ElementValue");
          }
          return (byte) super.getConstantPool().getConstantInteger(getIndex()).getBytes();
      }
  
      public char getValueChar() {
          if (super.getType() != PRIMITIVE_CHAR) {
              throw new IllegalStateException("Don't call getValueChar() on a non CHAR ElementValue");
          }
          return (char) super.getConstantPool().getConstantInteger(getIndex()).getBytes();
      }
  
      public double getValueDouble() {
          if (super.getType() != PRIMITIVE_DOUBLE) {
              throw new IllegalStateException("Don't call getValueDouble() on a non DOUBLE ElementValue");
          }
          final ConstantDouble d = (ConstantDouble) super.getConstantPool().getConstant(getIndex());
          return d.getBytes();
      }
  
      public float getValueFloat() {
          if (super.getType() != PRIMITIVE_FLOAT) {
              throw new IllegalStateException("Don't call getValueFloat() on a non FLOAT ElementValue");
         }
         final ConstantFloat f = (ConstantFloat) super.getConstantPool().getConstant(getIndex());
         return f.getBytes();
     }
 
     public int getValueInt() {
         if (super.getType() != PRIMITIVE_INT) {
             throw new IllegalStateException("Don't call getValueInt() on a non INT ElementValue");
         }
         return super.getConstantPool().getConstantInteger(getIndex()).getBytes();
     }
 
     public long getValueLong() {
         if (super.getType() != PRIMITIVE_LONG) {
             throw new IllegalStateException("Don't call getValueLong() on a non LONG ElementValue");
         }
         final ConstantLong j = (ConstantLong) super.getConstantPool().getConstant(getIndex());
         return j.getBytes();
     }
 
     public short getValueShort() {
         if (super.getType() != PRIMITIVE_SHORT) {
             throw new IllegalStateException("Don't call getValueShort() on a non SHORT ElementValue");
         }
         final ConstantInteger s = (ConstantInteger) super.getConstantPool().getConstant(getIndex());
         return (short) s.getBytes();
     }
 
     public String getValueString() {
         if (super.getType() != STRING) {
             throw new IllegalStateException("Don't call getValueString() on a non STRING ElementValue");
         }
         return super.getConstantPool().getConstantUtf8(getIndex()).getBytes();
     }
 
     public void setIndex(final int index) {
         this.index = index;
     }
 
     // Whatever kind of value it is, return it as a string
     @Override
     public String stringifyValue() {
         final ConstantPool cpool = super.getConstantPool();
         final int type = super.getType();
         switch (type) {
         case PRIMITIVE_INT:
             return Integer.toString(cpool.getConstantInteger(getIndex()).getBytes());
         case PRIMITIVE_LONG:
             final ConstantLong j = cpool.getConstant(getIndex(), Const.CONSTANT_Long, ConstantLong.class);
             return Long.toString(j.getBytes());
         case PRIMITIVE_DOUBLE:
             final ConstantDouble d = cpool.getConstant(getIndex(), Const.CONSTANT_Double, ConstantDouble.class);
             return Double.toString(d.getBytes());
         case PRIMITIVE_FLOAT:
             final ConstantFloat f = cpool.getConstant(getIndex(), Const.CONSTANT_Float, ConstantFloat.class);
             return Float.toString(f.getBytes());
         case PRIMITIVE_SHORT:
             final ConstantInteger s = cpool.getConstantInteger(getIndex());
             return Integer.toString(s.getBytes());
         case PRIMITIVE_BYTE:
             final ConstantInteger b = cpool.getConstantInteger(getIndex());
             return Integer.toString(b.getBytes());
         case PRIMITIVE_CHAR:
             final ConstantInteger ch = cpool.getConstantInteger(getIndex());
             return String.valueOf((char) ch.getBytes());
         case PRIMITIVE_BOOLEAN:
             final ConstantInteger bo = cpool.getConstantInteger(getIndex());
             if (bo.getBytes() == 0) {
                 return "false";
             }
             return "true";
         case STRING:
             return cpool.getConstantUtf8(getIndex()).getBytes();
         default:
             throw new IllegalStateException("SimpleElementValue class does not know how to stringify type " + type);
         }
     }
 
     @Override
     public String toString() {
         return stringifyValue();
     }
 }