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2  * Copyright (C) 2014 The Android Open Source Project
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4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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8  * published by the Free Software Foundation.  Oracle designates this
9  * particular file as subject to the "Classpath" exception as provided
10  * by Oracle in the LICENSE file that accompanied this code.
11  *
12  * This code is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15  * version 2 for more details (a copy is included in the LICENSE file that
16  * accompanied this code).
17  *
18  * You should have received a copy of the GNU General Public License version
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20  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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25  */
26 
27 package java.nio;
28 
29 /**
30  * A read/write HeapLongBuffer.
31  */
32 
33 class HeapLongBuffer
34         extends LongBuffer {
35 
36     // For speed these fields are actually declared in X-Buffer;
37     // these declarations are here as documentation
38     /*
39 
40       protected final long[] hb;
41       protected final int offset;
42 
43     */
44 
HeapLongBuffer(int cap, int lim)45     HeapLongBuffer(int cap, int lim) {            // package-private
46         this(cap, lim, false);
47     }
48 
HeapLongBuffer(int cap, int lim, boolean isReadOnly)49     HeapLongBuffer(int cap, int lim, boolean isReadOnly) {            // package-private
50         super(-1, 0, lim, cap, new long[cap], 0);
51         this.isReadOnly = isReadOnly;
52     }
53 
HeapLongBuffer(long[] buf, int off, int len)54     HeapLongBuffer(long[] buf, int off, int len) { // package-private
55         this(buf, off, len, false);
56     }
57 
HeapLongBuffer(long[] buf, int off, int len, boolean isReadOnly)58     HeapLongBuffer(long[] buf, int off, int len, boolean isReadOnly) { // package-private
59         super(-1, off, off + len, buf.length, buf, 0);
60         this.isReadOnly = isReadOnly;
61     }
62 
HeapLongBuffer(long[] buf, int mark, int pos, int lim, int cap, int off)63     protected HeapLongBuffer(long[] buf,
64                              int mark, int pos, int lim, int cap,
65                              int off) {
66         this(buf, mark, pos, lim, cap, off, false);
67     }
68 
HeapLongBuffer(long[] buf, int mark, int pos, int lim, int cap, int off, boolean isReadOnly)69     protected HeapLongBuffer(long[] buf,
70                              int mark, int pos, int lim, int cap,
71                              int off, boolean isReadOnly) {
72         super(mark, pos, lim, cap, buf, off);
73         this.isReadOnly = isReadOnly;
74     }
75 
slice()76     public LongBuffer slice() {
77         return new HeapLongBuffer(hb,
78                 -1,
79                 0,
80                 this.remaining(),
81                 this.remaining(),
82                 this.position() + offset,
83                 isReadOnly);
84     }
85 
duplicate()86     public LongBuffer duplicate() {
87         return new HeapLongBuffer(hb,
88                 this.markValue(),
89                 this.position(),
90                 this.limit(),
91                 this.capacity(),
92                 offset,
93                 isReadOnly);
94     }
95 
asReadOnlyBuffer()96     public LongBuffer asReadOnlyBuffer() {
97         return new HeapLongBuffer(hb,
98                 this.markValue(),
99                 this.position(),
100                 this.limit(),
101                 this.capacity(),
102                 offset, true);
103     }
104 
105 
ix(int i)106     protected int ix(int i) {
107         return i + offset;
108     }
109 
get()110     public long get() {
111         return hb[ix(nextGetIndex())];
112     }
113 
get(int i)114     public long get(int i) {
115         return hb[ix(checkIndex(i))];
116     }
117 
get(long[] dst, int offset, int length)118     public LongBuffer get(long[] dst, int offset, int length) {
119         checkBounds(offset, length, dst.length);
120         if (length > remaining())
121             throw new BufferUnderflowException();
122         System.arraycopy(hb, ix(position()), dst, offset, length);
123         position(position() + length);
124         return this;
125     }
126 
isDirect()127     public boolean isDirect() {
128         return false;
129     }
130 
isReadOnly()131     public boolean isReadOnly() {
132         return isReadOnly;
133     }
134 
put(long x)135     public LongBuffer put(long x) {
136         if (isReadOnly) {
137             throw new ReadOnlyBufferException();
138         }
139         hb[ix(nextPutIndex())] = x;
140         return this;
141     }
142 
put(int i, long x)143     public LongBuffer put(int i, long x) {
144         if (isReadOnly) {
145             throw new ReadOnlyBufferException();
146         }
147         hb[ix(checkIndex(i))] = x;
148         return this;
149     }
150 
put(long[] src, int offset, int length)151     public LongBuffer put(long[] src, int offset, int length) {
152         if (isReadOnly) {
153             throw new ReadOnlyBufferException();
154         }
155         checkBounds(offset, length, src.length);
156         if (length > remaining())
157             throw new BufferOverflowException();
158         System.arraycopy(src, offset, hb, ix(position()), length);
159         position(position() + length);
160         return this;
161     }
162 
put(LongBuffer src)163     public LongBuffer put(LongBuffer src) {
164         if (src == this) {
165             throw new IllegalArgumentException();
166         }
167         if (isReadOnly) {
168             throw new ReadOnlyBufferException();
169         }
170         if (src instanceof HeapLongBuffer) {
171             HeapLongBuffer sb = (HeapLongBuffer) src;
172             int n = sb.remaining();
173             if (n > remaining())
174                 throw new BufferOverflowException();
175             System.arraycopy(sb.hb, sb.ix(sb.position()),
176                     hb, ix(position()), n);
177             sb.position(sb.position() + n);
178             position(position() + n);
179         } else if (src.isDirect()) {
180             int n = src.remaining();
181             if (n > remaining())
182                 throw new BufferOverflowException();
183             src.get(hb, ix(position()), n);
184             position(position() + n);
185         } else {
186             super.put(src);
187         }
188         return this;
189     }
190 
compact()191     public LongBuffer compact() {
192         if (isReadOnly) {
193             throw new ReadOnlyBufferException();
194         }
195         System.arraycopy(hb, ix(position()), hb, ix(0), remaining());
196         position(remaining());
197         limit(capacity());
198         discardMark();
199         return this;
200     }
201 
order()202     public ByteOrder order() {
203         return ByteOrder.nativeOrder();
204     }
205 }
206