1 /*
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.
5  *
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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
19  * 2 along with this work; if not, write to the Free Software Foundation,
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 HeapDoubleBuffer.
31  */
32 
33 class HeapDoubleBuffer extends DoubleBuffer {
34 
35     // For speed these fields are actually declared in X-Buffer;
36     // these declarations are here as documentation
37     /*
38 
39       protected final double[] hb;
40       protected final int offset;
41 
42     */
43 
HeapDoubleBuffer(int cap, int lim)44     HeapDoubleBuffer(int cap, int lim) {            // package-private
45         this(cap, lim, false);
46     }
47 
HeapDoubleBuffer(double[] buf, int off, int len)48     HeapDoubleBuffer(double[] buf, int off, int len) { // package-private
49         this(buf, off, len, false);
50     }
51 
HeapDoubleBuffer(double[] buf, int mark, int pos, int lim, int cap, int off)52     protected HeapDoubleBuffer(double[] buf,
53                                int mark, int pos, int lim, int cap,
54                                int off) {
55         this(buf, mark, pos, lim, cap, off, false);
56     }
57 
HeapDoubleBuffer(int cap, int lim, boolean isReadOnly)58     HeapDoubleBuffer(int cap, int lim, boolean isReadOnly) {            // package-private
59         super(-1, 0, lim, cap, new double[cap], 0);
60         this.isReadOnly = isReadOnly;
61     }
62 
HeapDoubleBuffer(double[] buf, int off, int len, boolean isReadOnly)63     HeapDoubleBuffer(double[] buf, int off, int len, boolean isReadOnly) { // package-private
64         super(-1, off, off + len, buf.length, buf, 0);
65         this.isReadOnly = isReadOnly;
66     }
67 
HeapDoubleBuffer(double[] buf, int mark, int pos, int lim, int cap, int off, boolean isReadOnly)68     protected HeapDoubleBuffer(double[] buf,
69                                int mark, int pos, int lim, int cap,
70                                int off, boolean isReadOnly) {
71         super(mark, pos, lim, cap, buf, off);
72         this.isReadOnly = isReadOnly;
73     }
74 
75 
slice()76     public DoubleBuffer slice() {
77         return new HeapDoubleBuffer(hb,
78                                     -1,
79                                     0,
80                                     this.remaining(),
81                                     this.remaining(),
82                                     this.position() + offset,
83                                     isReadOnly);
84     }
85 
duplicate()86     public DoubleBuffer duplicate() {
87         return new HeapDoubleBuffer(hb,
88                                     this.markValue(),
89                                     this.position(),
90                                     this.limit(),
91                                     this.capacity(),
92                                     offset,
93                                     isReadOnly);
94     }
95 
asReadOnlyBuffer()96     public DoubleBuffer asReadOnlyBuffer() {
97         return new HeapDoubleBuffer(hb,
98                                      this.markValue(),
99                                      this.position(),
100                                      this.limit(),
101                                      this.capacity(),
102                                      offset, true);
103     }
104 
ix(int i)105     protected int ix(int i) {
106         return i + offset;
107     }
108 
get()109     public double get() {
110         return hb[ix(nextGetIndex())];
111     }
112 
get(int i)113     public double get(int i) {
114         return hb[ix(checkIndex(i))];
115     }
116 
get(double[] dst, int offset, int length)117     public DoubleBuffer get(double[] dst, int offset, int length) {
118         checkBounds(offset, length, dst.length);
119         if (length > remaining())
120             throw new BufferUnderflowException();
121         System.arraycopy(hb, ix(position()), dst, offset, length);
122         position(position() + length);
123         return this;
124     }
125 
isDirect()126     public boolean isDirect() {
127         return false;
128     }
129 
isReadOnly()130     public boolean isReadOnly() {
131         return isReadOnly;
132     }
133 
put(double x)134     public DoubleBuffer put(double x) {
135         if (isReadOnly) {
136             throw new ReadOnlyBufferException();
137         }
138         hb[ix(nextPutIndex())] = x;
139         return this;
140     }
141 
put(int i, double x)142     public DoubleBuffer put(int i, double x) {
143         if (isReadOnly) {
144             throw new ReadOnlyBufferException();
145         }
146         hb[ix(checkIndex(i))] = x;
147         return this;
148     }
149 
put(double[] src, int offset, int length)150     public DoubleBuffer put(double[] src, int offset, int length) {
151         if (isReadOnly) {
152             throw new ReadOnlyBufferException();
153         }
154         checkBounds(offset, length, src.length);
155         if (length > remaining())
156             throw new BufferOverflowException();
157         System.arraycopy(src, offset, hb, ix(position()), length);
158         position(position() + length);
159         return this;
160     }
161 
put(DoubleBuffer src)162     public DoubleBuffer put(DoubleBuffer src) {
163         if (src == this) {
164             throw new IllegalArgumentException();
165         }
166         if (isReadOnly) {
167             throw new ReadOnlyBufferException();
168         }
169         if (src instanceof HeapDoubleBuffer) {
170             HeapDoubleBuffer sb = (HeapDoubleBuffer)src;
171             int n = sb.remaining();
172             if (n > remaining())
173                 throw new BufferOverflowException();
174             System.arraycopy(sb.hb, sb.ix(sb.position()),
175                              hb, ix(position()), n);
176             sb.position(sb.position() + n);
177             position(position() + n);
178         } else if (src.isDirect()) {
179             int n = src.remaining();
180             if (n > remaining())
181                 throw new BufferOverflowException();
182             src.get(hb, ix(position()), n);
183             position(position() + n);
184         } else {
185             super.put(src);
186         }
187         return this;
188     }
189 
compact()190     public DoubleBuffer compact() {
191         if (isReadOnly) {
192             throw new ReadOnlyBufferException();
193         }
194         System.arraycopy(hb, ix(position()), hb, ix(0), remaining());
195         position(remaining());
196         limit(capacity());
197         discardMark();
198         return this;
199     }
200 
order()201     public ByteOrder order() {
202         return ByteOrder.nativeOrder();
203     }
204 }
205