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ArrayType.java

package de.fub.bytecode.generic;

import de.fub.bytecode.Constants;

/** 
 * Denotes array type, such as int[][]
 *
 * @version $Id: ArrayType.java,v 1.1.1.1 2002/01/24 03:41:38 pserver Exp $
 * @author  <A HREF="http://www.inf.fu-berlin.de/~dahm">M. Dahm</A>
 */
public final class ArrayType extends ReferenceType {
  private int  dimensions;
  private Type basic_type;

  /**
   * Convenience constructor for array type, e.g. int[]
   *
   * @param type array type, e.g. T_INT
   */ 
  public ArrayType(byte type, int dimensions) {
    this(BasicType.getType(type), dimensions);
  }  
  /**
   * Constructor for array of given type
   *
   * @param type type of array (may be an array itself)
   */ 
  public ArrayType(Type type, int dimensions) {
    super(Constants.T_ARRAY, "<dummy>");

    if((dimensions < 1) || (dimensions > Constants.MAX_BYTE))
      throw new ClassGenException("Invalid number of dimensions: " + dimensions);

    switch(type.getType()) {
    case Constants.T_ARRAY:
      ArrayType array = (ArrayType)type;
      this.dimensions = dimensions + array.dimensions;
      basic_type      = array.basic_type;
      break;
      
    case Constants.T_VOID:
      throw new ClassGenException("Invalid type: void[]");

    default: // Basic type or reference
      this.dimensions = dimensions;
      basic_type = type;
      break;
    }

    StringBuffer buf = new StringBuffer();
    for(int i=0; i < this.dimensions; i++)
      buf.append('[');

    buf.append(basic_type.getSignature());

    signature = buf.toString();
  }  
  /**
   * Convenience constructor for reference array type, e.g. Object[]
   *
   * @param class_name complete name of class (java.lang.String, e.g.)
   */ 
  public ArrayType(String class_name, int dimensions) {
    this(new ObjectType(class_name), dimensions);
  }  
  /** @return true if both type objects refer to the same array type.
   */
  public boolean equals(Object type) {
    if(type instanceof ArrayType) {
      ArrayType array = (ArrayType)type;
      return (array.dimensions == dimensions) && array.basic_type.equals(basic_type);
    } else
      return false;
  }  
  /**
   * @return basic type of array, i.e., for int[][][] the basic type is int
   */
  public Type getBasicType() {
    return basic_type;
  }  
  /** @return number of dimensions of array
   */
  public int getDimensions() { return dimensions; }  
  /**
   * @return element type of array, i.e., for int[][][] the element type is int[][]
   */
  public Type getElementType() {
    if(dimensions == 1)
      return basic_type;
    else
      return new ArrayType(basic_type, dimensions - 1);
  }  
  /** @return a hash code value for the object.
   */
  public int hashcode() { return basic_type.hashCode() ^ dimensions; }  
}

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