VariableSizeCollection.java revision 12b970ed4dfad768002335503e49c348ea0ed69b 
1/*
2 * Copyright 2012, Google Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 *     * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *     * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *     * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32package org.jf.dexlib2.dexbacked.util;
33
34import org.jf.dexlib2.dexbacked.DexBuffer;
35import org.jf.dexlib2.dexbacked.DexReader;
36
37import javax.annotation.Nonnull;
38import java.util.AbstractCollection;
39import java.util.Iterator;
40
41public abstract class VariableSizeCollection<T> extends AbstractCollection<T> {
42    @Nonnull private final DexBuffer dexBuf;
43    private final int offset;
44    private final int size;
45
46    public VariableSizeCollection(@Nonnull DexBuffer dexBuf, int offset, int size) {
47        this.dexBuf = dexBuf;
48        this.offset = offset;
49        this.size = size;
50    }
51
52    @Nonnull protected abstract T readNextItem(@Nonnull DexReader reader, int index);
53
54    @Override
55    public VariableSizeIterator<T> iterator() {
56        return new VariableSizeIterator<T>(dexBuf, offset, size) {
57            @Nonnull
58            @Override
59            protected T readNextItem(@Nonnull DexReader reader, int index) {
60                return VariableSizeCollection.this.readNextItem(reader, index);
61            }
62        };
63    }
64
65    @Override public int size() { return size; }
66}
67