// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package com.google.protobuf;
import java.util.Random;
/** Utility class that provides data primitives for filling out protobuf messages. */
public final class ExperimentalTestDataProvider {
private static final Random RANDOM = new Random(100);
private final Varint32Provider varint32s = new Varint32Provider();
private final Varint64Provider varint64s = new Varint64Provider();
private final int stringLength;
public ExperimentalTestDataProvider(int stringLength) {
this.stringLength = stringLength;
}
public double getDouble() {
double value = 0.0;
while (Double.compare(0.0, value) == 0) {
value = RANDOM.nextDouble();
}
return value;
}
public float getFloat() {
float value = 0.0f;
while (Float.compare(0.0f, value) == 0) {
value = RANDOM.nextFloat();
}
return value;
}
public long getLong() {
return varint64s.getLong();
}
public int getInt() {
return varint32s.getInt();
}
public boolean getBool() {
return true;
}
public int getEnum() {
return Math.abs(getInt()) % 3;
}
public String getString() {
StringBuilder builder = new StringBuilder(stringLength);
for (int i = 0; i < stringLength; ++i) {
builder.append((char) (RANDOM.nextInt('z' - 'a') + 'a'));
}
return builder.toString();
}
public ByteString getBytes() {
return ByteString.copyFromUtf8(getString());
}
/**
* Iterator over integer values. Uses a simple distribution over 32-bit varints (generally
* favoring smaller values).
*/
private static final class Varint32Provider {
private static final int[][] VALUES = {
new int[] {1, 50, 100, 127}, // 1 byte values
new int[] {128, 500, 10000, 16383}, // 2 bytes values
new int[] {16384, 50000, 1000000, 2097151}, // 3 bytes values
new int[] {2097152, 10000000, 200000000, 268435455}, // 4 bytes values
new int[] {268435456, 0x30000000, 0x7FFFFFFF, 0xFFFFFFFF} // 5 bytes values
};
/** Number of samples that should be taken from each value array. */
private static final int[] NUM_SAMPLES = {3, 2, 1, 1, 2};
/**
* The index into the {@link #VALUES} array that identifies the list of samples currently being
* iterated over.
*/
private int listIndex;
/** The index of the next sample within a list. */
private int sampleIndex;
/** The number of successive samples that have been taken from the current list. */
private int samplesTaken;
public int getInt() {
if (samplesTaken++ > NUM_SAMPLES[listIndex]) {
// Done taking samples from this list. Go to the next one.
listIndex = (listIndex + 1) % VALUES.length;
sampleIndex = 0;
samplesTaken = 0;
}
int value = VALUES[listIndex][sampleIndex];
// All lists are exactly 4 long (i.e. power of 2), so we can optimize the mod operation
// with masking.
sampleIndex = (sampleIndex + 1) & 3;
return value;
}
}
/**
* Iterator over integer values. Uses a simple distribution over 64-bit varints (generally
* favoring smaller values).
*/
private static final class Varint64Provider {
private static final long[][] VALUES = {
new long[] {1, 50, 100, 127},
new long[] {128, 500, 10000, 16383},
new long[] {16384, 50000, 1000000, 2097151},
new long[] {2097152, 10000000, 200000000, 268435455},
new long[] {268435456, 0x30000000, 0x7FFFFFFF, 34359738367L},
new long[] {34359738368L, 2000000000000L, 4000000000000L, 4398046511103L},
new long[] {4398046511104L, 200000000000000L, 500000000000000L, 562949953421311L},
new long[] {0x4000000000000L, 0x5000000000000L, 0x6000000000000L, 0x0FFFFFFFFFFFFFFL},
new long[] {0x100000000000000L, 0x3FFFFFFFFFFFFFFFL, 0x5FFFFFFFFFFFFFFL, 0x7FFFFFFFFFFFFFFFL},
new long[] {
0xFFFFFFFFFFFFFFFFL, 0xFFFFFFFFFFFFFFFFL, 0xFFFFFFFFFFFFFFFFL, 0xFFFFFFFFFFFFFFFFL
}
};
/** Number of samples that should be taken from each value array. */
private static final int[] NUM_SAMPLES = {4, 2, 2, 1, 1, 1, 1, 2, 2, 4};
/**
* The index into the {@link #VALUES} array that identifies the list of samples currently being
* iterated over.
*/
private int listIndex;
/** The index of the next sample within a list. */
private int sampleIndex;
/** The number of successive samples that have been taken from the current list. */
private int samplesTaken;
public long getLong() {
if (samplesTaken++ > NUM_SAMPLES[listIndex]) {
// Done taking samples from this list. Go to the next one.
listIndex = (listIndex + 1) % VALUES.length;
sampleIndex = 0;
samplesTaken = 0;
}
long value = VALUES[listIndex][sampleIndex];
// All lists are exactly 4 long (i.e. power of 2), so we can optimize the mod operation
// with masking.
sampleIndex = (sampleIndex + 1) & 3;
return value;
}
}
}
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