1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
80 */
81 public static abstract class Adapter<T,U> extends ReadOnly<T> {
82 private final Iterator<? extends U> core;
83
84 public Adapter(Iterator<? extends U> core) {
85 this.core = core;
86 }
87
88 public boolean hasNext() {
89 return core.hasNext();
90 }
91
92 public T next() {
93 return filter(core.next());
94 }
95
96 protected abstract T filter(U u);
97 }
98
99 /**
100 * For each U, apply U->Iterator<T> function and then iterate all
101 * the resulting T.
102 */
103 public static abstract class Map<T,U> extends ReadOnly<T> {
104 private final Iterator<? extends U> core;
105
106 private Iterator<? extends T> current;
107
108 protected Map(Iterator<? extends U> core) {
109 this.core = core;
110 }
111
112 public boolean hasNext() {
113 while(current==null || !current.hasNext()) {
114 if(!core.hasNext())
115 return false; // nothing more to enumerate
116 current = apply(core.next());
117 }
118 return true;
119 }
120
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1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
80 */
81 public static abstract class Adapter<T,U> extends ReadOnly<T> {
82 private final Iterator<? extends U> core;
83
84 public Adapter(Iterator<? extends U> core) {
85 this.core = core;
86 }
87
88 public boolean hasNext() {
89 return core.hasNext();
90 }
91
92 public T next() {
93 return filter(core.next());
94 }
95
96 protected abstract T filter(U u);
97 }
98
99 /**
100 * For each U, apply {@code U->Iterator<T>} function and then iterate all
101 * the resulting T.
102 */
103 public static abstract class Map<T,U> extends ReadOnly<T> {
104 private final Iterator<? extends U> core;
105
106 private Iterator<? extends T> current;
107
108 protected Map(Iterator<? extends U> core) {
109 this.core = core;
110 }
111
112 public boolean hasNext() {
113 while(current==null || !current.hasNext()) {
114 if(!core.hasNext())
115 return false; // nothing more to enumerate
116 current = apply(core.next());
117 }
118 return true;
119 }
120
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