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package java.util;
public abstract class AbstractCollection
implements Collection
{
protected AbstractCollection()
{
}
public abstract Iterator iterator();
public abstract int size();
public boolean isEmpty()
{
return size() == 0;
}
public boolean contains(Object o)
{
Iterator it = iterator();
while (it.hasNext())
{
Object e = it.next();
if (o == null)
{
if (e == null)
{
return true;
}
}
else
{
if (o.equals(e))
{
return true;
}
}
}
return false;
}
public Object[] toArray()
{
Object[] arObjects = new Object[size()];
Iterator it = iterator();
int i = 0;
while (it.hasNext())
{
arObjects[i++] = it.next();
}
return arObjects;
}
public Object[] toArray(Object[] a)
throws NullPointerException, ArrayStoreException
//TODO: Check if this is realy compatible to SUN!!!
{
if (a == null)
{
throw new NullPointerException();
}
if (isEmpty())
{
return a;
}
Object[] arObjects = null;
int size = size();
if (a.length < size)
{
Iterator it = iterator();
Object o = it.next();
if (o == null) //no object or object is null
{
throw new ArrayStoreException(); //correct ?
}
throw new ArrayStoreException("please pass array of correct size");
}
else
{
arObjects = a;
if (a.length > size)
{
arObjects[size] = null;
}
}
Iterator it = iterator();
int i = 0;
while (it.hasNext())
{
Object o = it.next();
arObjects[i++] = o;
}
return arObjects;
}
public boolean add(Object o)
throws RuntimeException, NullPointerException, ClassCastException, IllegalArgumentException
{
throw new RuntimeException();
}
public boolean remove(Object o)
throws RuntimeException
{
Iterator it = iterator();
while (it.hasNext())
{
Object e = it.next();
if (o == null)
{
if (e == null)
{
try
{
it.remove();
}
catch (RuntimeException ue)
{
throw ue;
}
return true;
}
}
else
{
if (o.equals(e))
{
try
{
it.remove();
}
catch (RuntimeException ue)
{
throw ue;
}
return true;
}
}
}
return false;
}
public boolean containsAll(Collection c)
{
Iterator it = c.iterator();
while (it.hasNext())
{
if (!contains(it.next()))
{
return false;
}
}
return true;
}
public boolean addAll(Collection c)
throws RuntimeException
{
Iterator it = c.iterator();
boolean ret = false;
while (it.hasNext())
{
try
{
ret |= add(it.next());
}
catch (RuntimeException ue)
{
throw ue;
}
}
return ret;
}
public boolean removeAll(Collection c)
throws RuntimeException
{
Iterator it = iterator();
boolean ret = false;
while (it.hasNext())
{
if (c.contains(it.next()))
{
try
{
it.remove();
ret = true;
}
catch (RuntimeException ue)
{
throw ue;
}
}
}
return ret;
}
public boolean retainAll(Collection c)
throws RuntimeException
{
Iterator it = iterator();
boolean ret = false;
while (it.hasNext())
{
if (!c.contains(it.next()))
{
try
{
it.remove();
ret = true;
}
catch (RuntimeException ue)
{
throw ue;
}
}
}
return ret;
}
public void clear()
throws RuntimeException
{
Iterator it = iterator();
while (it.hasNext())
{
try
{
it.next();
it.remove();
}
catch (RuntimeException ue)
{
throw ue;
}
}
}
public String toString()
{
StringBuffer ret = new StringBuffer("[");
Iterator it = iterator();
if (it.hasNext())
{
ret.append(String.valueOf(it.next()));
}
while (it.hasNext())
{
ret.append(", ");
ret.append(String.valueOf(it.next()));
}
ret.append("]");
return ret.toString();
}
}
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