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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.collections.primitives;
18  
19  /**
20   * An iterator over <code>double</code> values.
21   *
22   * @see org.apache.commons.collections.primitives.adapters.DoubleIteratorIterator
23   * @see org.apache.commons.collections.primitives.adapters.IteratorDoubleIterator
24   *
25   * @since Commons Primitives 1.0
26   * @version $Revision: 480460 $ $Date: 2006-11-29 03:14:21 -0500 (Wed, 29 Nov 2006) $
27   * 
28   * @author Rodney Waldhoff 
29   */
30  public interface DoubleIterator {
31      /** 
32       * Returns <code>true</code> iff I have more elements. 
33       * (In other words, returns <code>true</code> iff 
34       * a subsequent call to {@link #next next} will return 
35       * an element rather than throwing an exception.)
36       * 
37       * @return <code>true</code> iff I have more elements
38       */
39      boolean hasNext();
40      
41      /** 
42       * Returns the next element in me.
43       * 
44       * @return the next element in me
45       * @throws java.util.NoSuchElementException if there is no next element
46       */          
47      double next();
48      
49      /** 
50       * Removes from my underlying collection the last 
51       * element {@link #next returned} by me 
52       * (optional operation). 
53       * 
54       * @throws UnsupportedOperationException if this operation is not supported
55       * @throws IllegalStateException if {@link #next} has not yet been 
56       *         called, or {@link #remove} has already been called since 
57       *         the last call to {@link #next}.
58       */          
59      void remove();
60  }