code: package org.omnetpp.common.image;
  
  import org.eclipse.core.runtime.Assert;
  
  public final class Padding {
  
      public static final Padding NULL = new Padding(0);
  
      public final int left;
      public final int top;
      public final int right;
      public final int bottom;
  
      public Padding(int padding) {
          this(padding, padding, padding, padding);
      }
  
      public Padding(int left, int top, int right, int bottom) {
          Assert.isLegal(left >= 0 && top >= 0 && right >= 0 && bottom >=0);
          this.left = left;
          this.top = top;
          this.right = right;
          this.bottom = bottom;
      }
  
      public int getWidth() {
          return left + right;
      }
  
      public int getHeight() {
          return top + bottom;
      }
  
      public boolean equals(Object o) {
          if (this == o)
              return true;
          if (!(o instanceof Padding))
              return false;
  
          Padding other = (Padding)o;
          return left == other.left &&
                  top == other.top &&
                  right == other.right &&
                  bottom == other.bottom;
      }
  
      public int hashCode() {
          return left + top + right + bottom;
      }
  
      public String toString() {
          return "Padding("+left+","+top+","+right+","+bottom+")";
      }
  }
  