Skip to main content
aboutsummaryrefslogtreecommitdiffstats
blob: cf2a1811004738a50a201446aa2389a6e1e4c3e6 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
/*
 * Copyright (c) 2009-2013, 2019 Eike Stepper (Loehne, Germany) and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Simon McDuff - initial API and implementation
 *    Eike Stepper - maintenance
 *    Christian W. Damus (CEA LIST) - bug 421287
 */
package org.eclipse.emf.cdo.spi.common;

import org.eclipse.emf.cdo.common.CDOCommonView;
import org.eclipse.emf.cdo.common.util.BlockingCloseableIterator;
import org.eclipse.emf.cdo.common.util.CDOQueryInfo;
import org.eclipse.emf.cdo.common.util.CDOQueryQueue;

import org.eclipse.net4j.util.WrappedException;

/**
 * If the meaning of this type isn't clear, there really should be more of a description here...
 *
 * @author Simon McDuff
 * @since 2.0
 */
public class AbstractQueryResult<T> implements BlockingCloseableIterator<T>
{
  private CDOCommonView view;

  private CDOQueryInfo queryInfo;

  private int queryID;

  private CDOQueryQueue<Object> queue = new CDOQueryQueue<Object>();

  private BlockingCloseableIterator<Object> queueItr = queue.iterator();

  /**
   * @since 3.0
   */
  public AbstractQueryResult(CDOCommonView view, CDOQueryInfo queryInfo, int queryID)
  {
    this.view = view;
    this.queryInfo = queryInfo;
    this.queryID = queryID;
  }

  public CDOCommonView getView()
  {
    return view;
  }

  /**
   * @since 3.0
   */
  public CDOQueryInfo getQueryInfo()
  {
    return queryInfo;
  }

  public int getQueryID()
  {
    return queryID;
  }

  public CDOQueryQueue<Object> getQueue()
  {
    return queue;
  }

  public void setQueryID(int queryID)
  {
    this.queryID = queryID;
  }

  @Override
  @SuppressWarnings("unchecked")
  public T peek()
  {
    return (T)queueItr.peek();
  }

  @Override
  public boolean hasNext()
  {
    return queueItr.hasNext();
  }

  @Override
  @SuppressWarnings("unchecked")
  public T next()
  {
    Object element = queueItr.next();
    if (element instanceof Throwable)
    {
      if (element instanceof Error)
      {
        throw (Error)element;
      }

      throw WrappedException.wrap((Exception)element);
    }

    return (T)element;
  }

  @Override
  public void remove()
  {
    throw new UnsupportedOperationException();
  }

  @Override
  public void close()
  {
    queueItr.close();
    queue.close();
  }

  @Override
  public boolean isClosed()
  {
    return queueItr.isClosed();
  }
}

Back to the top