/*

  * Licensed 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.commons.classscan.builtin;

 import java.util.Iterator;

 import java.util.NoSuchElementException;

 import org.apache.commons.classscan.ClassFile;

 public abstract class ClassFileIterator implements Iterator<ClassFile> {                

         private ClassFile prefetch;

         abstract ClassFile getNext();

         @Override

         public boolean hasNext() {

                 if(prefetch==null) {

                         prefetch= getNext();

                 }

                 return prefetch!=null;

         }

         @Override

         public ClassFile next() {

                 if(prefetch!=null) {

                         ClassFile rc= prefetch;

                         prefetch= null;

                         return rc;

                 }

                 ClassFile rc= getNext();

                 if(rc==null) {

                         throw new NoSuchElementException();

                 }

                 return rc;

         }

         @Override

         public void remove() {

                 throw new UnsupportedOperationException();

         }                        

 }