cn.wjybxx.dson.text.NumberStyle Maven / Gradle / Ivy
package cn.wjybxx.dson.text;
import java.math.BigDecimal;
import java.util.List;
/**
* @author wjybxx
* date - 2023/6/19
*/
public enum NumberStyle implements INumberStyle {
/**
* 简单格式，能省略类型标签的情况下就省略标签
*/
SIMPLE(1) {
@Override
public void toString(int value, StyleOut styleOut) {
styleOut.setValue(Integer.toString(value));
}
@Override
public void toString(long value, StyleOut styleOut) {
styleOut.setValue(Long.toString(value));
// 数字的默认解析类型是double，如果值超过了double的表示范围，将无法正确解析
if (Math.abs(value) >= DOUBLE_MAX_LONG) {
styleOut.setTyped(true);
}
}
@Override
public void toString(float value, StyleOut styleOut) {
if (Float.isNaN(value) || Float.isInfinite(value)) {
String string = Float.toString(value);
styleOut.setValue(string)
.setTyped(true);
} else {
int iv = (int) value;
if (iv == value) {
styleOut.setValue(Integer.toString(iv));
} else {
String string = Float.toString(value);
styleOut.setValue(string)
.setTyped(string.lastIndexOf('E') >= 0);
}
}
}
@Override
public void toString(double value, StyleOut styleOut) {
if (Double.isNaN(value) || Double.isInfinite(value)) {
styleOut.setValue(Double.toString(value))
.setTyped(true);
} else {
long lv = (long) value;
if (lv == value) {
styleOut.setValue(Long.toString(lv));
} else {
String string = Double.toString(value);
styleOut.setValue(string)
.setTyped(string.lastIndexOf('E') >= 0);
}
}
}
},
/** 简单模式，但禁用科学计数法 */
SIMPLE_NO_SCI(2) {
@Override
public void toString(int value, StyleOut styleOut) {
styleOut.setValue(Integer.toString(value));
}
@Override
public void toString(long value, StyleOut styleOut) {
styleOut.setValue(Long.toString(value));
// 数字的默认解析类型是double，如果值超过了double的表示范围，将无法正确解析
if (Math.abs(value) >= DOUBLE_MAX_LONG) {
styleOut.setTyped(true);
}
}
@Override
public void toString(float value, StyleOut styleOut) {
if (Float.isNaN(value) || Float.isInfinite(value)) {
String string = Float.toString(value);
styleOut.setValue(string)
.setTyped(true);
} else {
int iv = (int) value;
if (iv == value) {
styleOut.setValue(Integer.toString(iv));
} else {
styleOut.setValue(NumberStyle.toStringNoSci(value));
}
}
}
@Override
public void toString(double value, StyleOut styleOut) {
if (Double.isNaN(value) || Double.isInfinite(value)) {
styleOut.setValue(Double.toString(value))
.setTyped(true);
} else {
long lv = (long) value;
if (lv == value) {
styleOut.setValue(Long.toString(lv));
} else {
styleOut.setValue(NumberStyle.toStringNoSci(value));
}
}
}
},
/** 有类型标签的 */
TYPED(3) {
@Override
public void toString(int value, StyleOut styleOut) {
SIMPLE.toString(value, styleOut);
styleOut.setTyped(true);
}
@Override
public void toString(long value, StyleOut styleOut) {
SIMPLE.toString(value, styleOut);
styleOut.setTyped(true);
}
@Override
public void toString(float value, StyleOut styleOut) {
SIMPLE.toString(value, styleOut);
styleOut.setTyped(true);
}
@Override
public void toString(double value, StyleOut styleOut) {
SIMPLE.toString(value, styleOut);
styleOut.setTyped(true);
}
},
/** 有类型标签，且禁用科学计数法 */
TYPED_NO_SCI(4) {
@Override
public void toString(int value, StyleOut styleOut) {
SIMPLE_NO_SCI.toString(value, styleOut);
styleOut.setTyped(true);
}
@Override
public void toString(long value, StyleOut styleOut) {
SIMPLE_NO_SCI.toString(value, styleOut);
styleOut.setTyped(true);
}
@Override
public void toString(float value, StyleOut styleOut) {
SIMPLE_NO_SCI.toString(value, styleOut);
styleOut.setTyped(true);
}
@Override
public void toString(double value, StyleOut styleOut) {
SIMPLE_NO_SCI.toString(value, styleOut);
styleOut.setTyped(true);
}
},
/** 16进制，打印正负号，只打印绝对值部分 -- 一定有标签，对于浮点数要小心使用 */
SIGNED_HEX(5) {
@Override
public void toString(int value, StyleOut styleOut) {
styleOut.setTyped(true);
if (value < 0 && value != Integer.MIN_VALUE) {
styleOut.setValue("-0x" + Integer.toHexString(-value));
} else {
styleOut.setValue("0x" + Integer.toHexString(value));
}
}
@Override
public void toString(long value, StyleOut styleOut) {
styleOut.setTyped(true);
if (value < 0 && value != Long.MIN_VALUE) {
styleOut.setValue("-0x" + Long.toHexString(-value));
} else {
styleOut.setValue("0x" + Long.toHexString(value));
}
}
@Override
public void toString(float value, StyleOut styleOut) {
styleOut.setTyped(true)
.setValue(Float.toHexString(value));
}
@Override
public void toString(double value, StyleOut styleOut) {
styleOut.setTyped(true)
.setValue(Double.toHexString(value));
}
},
/** 无符号16进制，按有效位打印 -- 对于整数来说，无符号的16进制输出不带负号 */
UNSIGNED_HEX(6) {
@Override
public void toString(int value, StyleOut styleOut) {
styleOut.setTyped(true)
.setValue("0x" + Integer.toHexString(value));
}
@Override
public void toString(long value, StyleOut styleOut) {
styleOut.setTyped(true)
.setValue("0x" + Long.toHexString(value));
}
@Override
public void toString(float value, StyleOut styleOut) {
styleOut.setTyped(true)
.setValue(Float.toHexString(value));
}
@Override
public void toString(double value, StyleOut styleOut) {
styleOut.setTyped(true)
.setValue(Double.toHexString(value));
}
},
/** 二进制，打印正负号 -- 一定有标签，不支持浮点数 */
SIGNED_BINARY(7) {
@Override
public void toString(int value, StyleOut styleOut) {
styleOut.setTyped(true);
if (value < 0 && value != Integer.MIN_VALUE) {
styleOut.setValue("-0b" + Integer.toBinaryString(-value));
} else {
styleOut.setValue("0b" + Integer.toBinaryString(value));
}
}
@Override
public void toString(long value, StyleOut styleOut) {
styleOut.setTyped(true);
if (value < 0 && value != Long.MIN_VALUE) {
styleOut.setValue("-0b" + Long.toBinaryString(-value));
} else {
styleOut.setValue("0b" + Long.toBinaryString(value));
}
}
@Override
public void toString(float value, StyleOut styleOut) {
throw new UnsupportedOperationException();
}
@Override
public void toString(double value, StyleOut styleOut) {
throw new UnsupportedOperationException();
}
},
/** 无符号2进制，按有效位打印;对于整数来说，无符号的2进制输出不带负号 */
UNSIGNED_BINARY(8) {
@Override
public void toString(int value, StyleOut styleOut) {
styleOut.setTyped(true)
.setValue("0b" + Integer.toBinaryString(value));
}
@Override
public void toString(long value, StyleOut styleOut) {
styleOut.setTyped(true)
.setValue("0b" + Long.toBinaryString(value));
}
@Override
public void toString(float value, StyleOut styleOut) {
throw new UnsupportedOperationException();
}
@Override
public void toString(double value, StyleOut styleOut) {
throw new UnsupportedOperationException();
}
},
/** 对于整数来说，固定输出为32位或64位 */
FIXED_BINARY(9) {
@Override
public void toString(int value, StyleOut styleOut) {
String binaryString = Integer.toBinaryString(value);
StringBuilder sb = new StringBuilder(34);
sb.append("0b");
if (binaryString.length() < 32) {
pending(sb, 32 - binaryString.length());
}
sb.append(binaryString);
styleOut.setTyped(true);
styleOut.setValue(sb.toString());
}
@Override
public void toString(long value, StyleOut styleOut) {
String binaryString = Long.toBinaryString(value);
StringBuilder sb = new StringBuilder(66);
sb.append("0b");
if (binaryString.length() < 64) {
pending(sb, 64 - binaryString.length());
}
sb.append(binaryString);
styleOut.setTyped(true);
styleOut.setValue(sb.toString());
}
private void pending(StringBuilder sb, int count) {
if (count <= 0) {
return;
}
sb.append("0".repeat(count));
}
@Override
public void toString(float value, StyleOut styleOut) {
throw new UnsupportedOperationException();
}
@Override
public void toString(double value, StyleOut styleOut) {
throw new UnsupportedOperationException();
}
},
;
public final int number;
NumberStyle(int number) {
this.number = number;
}
public int getNumber() {
return number;
}
/** 是否支持浮点数 */
public boolean supportFloat() {
return switch (this) {
case SIGNED_BINARY, UNSIGNED_BINARY, FIXED_BINARY -> false;
default -> true;
};
}
public static final List LOOK_TABLE = List.of(values());
public static NumberStyle forNumber(int number) {
return switch (number) {
case 1 -> SIMPLE;
case 2 -> SIMPLE_NO_SCI;
case 3 -> TYPED;
case 4 -> TYPED_NO_SCI;
case 5 -> SIGNED_HEX;
case 6 -> UNSIGNED_HEX;
case 7 -> SIGNED_BINARY;
case 8 -> UNSIGNED_BINARY;
case 9 -> FIXED_BINARY;
default -> throw new IllegalArgumentException("invalid number " + number);
};
}
/** double能精确表示的最大整数 */
private static final long DOUBLE_MAX_LONG = (1L << 53) - 1;
private static String toStringNoSci(float value) {
return new BigDecimal(Float.toString(value)) // 需先转换为String
.stripTrailingZeros()
.toPlainString();
}
private static String toStringNoSci(double value) {
return new BigDecimal(Double.toString(value)) // 需先转换为String
.stripTrailingZeros()
.toPlainString();
}
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