blob: 88cd46faefcba3a0978067a5a16d96598ed37bf6 (
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
|
/*******************************************************************************
* Copyright (c) 2009 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.utility.internal.iterables;
import java.util.Iterator;
import org.eclipse.jpt.utility.internal.StringTools;
import org.eclipse.jpt.utility.internal.iterators.CompositeIterator;
import org.eclipse.jpt.utility.internal.iterators.TransformationIterator;
/**
* A <code>CompositeIterable</code> wraps an {@link Iterable}
* of {@link Iterable}s and makes them appear to be a single
* {@link Iterable}.
*
* @param <E> the type of elements returned by the iterable's iterator
*
* @see CompositeIterator
* @see CompositeListIterable
*/
public class CompositeIterable<E>
implements Iterable<E>
{
private final Iterable<? extends Iterable<? extends E>> iterables;
/**
* Construct an iterable with the specified collection of iterables.
*/
public CompositeIterable(Iterable<? extends Iterable<? extends E>> iterables) {
super();
this.iterables = iterables;
}
/**
* Construct an iterable with the specified object prepended
* to the specified iterable.
*/
@SuppressWarnings("unchecked")
public CompositeIterable(E object, Iterable<? extends E> iterable) {
this(new SingleElementIterable<E>(object), iterable);
}
/**
* Construct an iterable with the specified object appended
* to the specified iterable.
*/
@SuppressWarnings("unchecked")
public CompositeIterable(Iterable<? extends E> iterable, E object) {
this(iterable, new SingleElementIterable<E>(object));
}
/**
* Construct an iterable with the specified iterables.
*/
public CompositeIterable(Iterable<? extends E>... iterables) {
this(new ArrayIterable<Iterable<? extends E>>(iterables));
}
/**
* combined iterators
*/
public Iterator<E> iterator() {
return new CompositeIterator<E>(this.iterators());
}
/**
* iterator of iterators
*/
protected Iterator<? extends Iterator<? extends E>> iterators() {
return new TransformationIterator<Iterable<? extends E>, Iterator<? extends E>>(this.iterables()) {
@Override
protected Iterator<? extends E> transform(Iterable<? extends E> next) {
return next.iterator();
}
};
}
/**
* iterator of iterables
*/
protected Iterator<? extends Iterable<? extends E>> iterables() {
return this.iterables.iterator();
}
@Override
public String toString() {
return StringTools.buildToStringFor(this, this.iterables);
}
}
|
