Add Quantity type

kubernetes/src/main/java/io/kubernetes/client/custom/BaseExponent.java

@@ -0,0 +1,56 @@
+package io.kubernetes.client.custom;
+
+public class BaseExponent {
+
+    private final int base;
+
+    private final int exponent;
+
+    private final Quantity.Format format;
+    public BaseExponent(int base, int exponent, Quantity.Format format) {
+        this.base = base;
+        this.exponent = exponent;
+        this.format = format;
+    }
+
+    public int getBase() {
+        return base;
+    }
+
+    public int getExponent() {
+        return exponent;
+    }
+
+    public Quantity.Format getFormat() {
+        return format;
+    }
+
+    @Override
+    public String toString() {
+        return "BaseExponent{" +
+                "base=" + base +
+                ", exponent=" + exponent +
+                ", format=" + format +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        BaseExponent that = (BaseExponent) o;
+
+        if (base != that.base) return false;
+        if (exponent != that.exponent) return false;
+        return format == that.format;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = base;
+        result = 31 * result + exponent;
+        result = 31 * result + (format != null ? format.hashCode() : 0);
+        return result;
+    }
+}

kubernetes/src/main/java/io/kubernetes/client/custom/Pair.java

@@ -0,0 +1,20 @@
+package io.kubernetes.client.custom;
+
+public class Pair<L, R> {
+
+    private final L left;
+    private final R right;
+
+    public Pair(final L left, final R right) {
+        this.left = left;
+        this.right = right;
+    }
+
+    public L getLeft() {
+        return left;
+    }
+
+    public R getRight() {
+        return right;
+    }
+}

kubernetes/src/main/java/io/kubernetes/client/custom/Quantity.java

@@ -0,0 +1,71 @@
+package io.kubernetes.client.custom;
+
+import com.google.gson.TypeAdapter;
+import com.google.gson.annotations.JsonAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+
+import java.io.IOException;
+import java.math.BigDecimal;
+
+@JsonAdapter(Quantity.QuantityAdapter.class)
+public class Quantity {
+
+    private final BigDecimal number;
+    private Format format;
+
+    public enum Format {
+        DECIMAL_EXPONENT(10), DECIMAL_SI(10), BINARY_SI(2);
+
+        private int base;
+
+        Format(final int base) {
+            this.base = base;
+        }
+
+        public int getBase() {
+            return base;
+        }
+    }
+
+    public Quantity(final BigDecimal number, final Format format) {
+        this.number = number;
+        this.format = format;
+    }
+
+    public BigDecimal getBigDecimal() {
+        return number;
+    }
+
+    public Format getFormat() {
+        return format;
+    }
+
+    public static Quantity fromString(final String value) {
+        return new QuantityFormatter().parse(value);
+    }
+
+    public String toSuffixedString() {
+        return new QuantityFormatter().format(this);
+    }
+
+    @Override
+    public String toString() {
+        return "Quantity{" +
+                "number=" + number +
+                ", format=" + format +
+                '}';
+    }
+
+    public class QuantityAdapter extends TypeAdapter<Quantity> {
+        @Override
+        public void write(JsonWriter jsonWriter, Quantity quantity) throws IOException {
+            jsonWriter.value(quantity.toSuffixedString());
+        }
+
+        @Override
+        public Quantity read(JsonReader jsonReader) throws IOException {
+            return Quantity.fromString(jsonReader.nextString());
+        }
+    }
+}

kubernetes/src/main/java/io/kubernetes/client/custom/QuantityFormatException.java

@@ -0,0 +1,7 @@
+package io.kubernetes.client.custom;
+
+public class QuantityFormatException extends RuntimeException {
+    public QuantityFormatException(String s) {
+        super(s);
+    }
+}

kubernetes/src/main/java/io/kubernetes/client/custom/QuantityFormatter.java

@@ -0,0 +1,90 @@
+package io.kubernetes.client.custom;
+
+import java.math.BigDecimal;
+import java.math.MathContext;
+
+public class QuantityFormatter {
+
+    private static final String PARTS_RE = "[eEinumkKMGTP]+";
+
+    public Quantity parse(final String value) {
+        if (value == null || value.isEmpty()) {
+            throw new QuantityFormatException("");
+        }
+        final String[] parts = value.split(PARTS_RE);
+        final BigDecimal numericValue = parseNumericValue(parts[0]);
+        final String suffix = value.substring(parts[0].length());
+        final BaseExponent baseExponent = new SuffixFormatter().parse(suffix);
+        final BigDecimal unitMultiplier = BigDecimal.valueOf(baseExponent.getBase()).pow(baseExponent.getExponent(), MathContext.DECIMAL64);
+        final BigDecimal unitlessValue = numericValue.multiply(unitMultiplier);
+        return new Quantity(unitlessValue, baseExponent.getFormat());
+    }
+
+    private static BigDecimal parseNumericValue(String part) {
+        try {
+            return new BigDecimal(part);
+        } catch (final NumberFormatException e) {
+            throw new QuantityFormatException("Unable to parse numeric part of quantity: " + part);
+        }
+    }
+
+    public String format(final Quantity quantity) {
+        switch (quantity.getFormat()) {
+            case DECIMAL_SI:
+            case DECIMAL_EXPONENT:
+                return toBase10String(quantity);
+            case BINARY_SI:
+                if (isFractional(quantity)) {
+                    return toBase10String(new Quantity(quantity.getBigDecimal(), Quantity.Format.DECIMAL_SI));
+                }
+                return toBase1024String(quantity);
+            default:
+                throw new IllegalArgumentException("Can't format a " + quantity.getFormat() + " quantity");
+        }
+    }
+
+    private boolean isFractional(Quantity quantity) {
+        return quantity.getBigDecimal().scale() > 0;
+    }
+
+    private String toBase1024String(final Quantity quantity) {
+        final BigDecimal amount = quantity.getBigDecimal();
+        final long value = amount.unscaledValue().longValue();
+        final int exponent = -amount.scale();
+        final Pair<Long, Integer> resultAndTimes = removeFactorsForBase(value, 1024);
+        return resultAndTimes.getLeft() + new SuffixFormatter().format(quantity.getFormat(), exponent + resultAndTimes.getRight() * 10);
+    }
+
+    private String toBase10String(final Quantity quantity) {
+        final BigDecimal amount = quantity.getBigDecimal();
+        final long value = amount.unscaledValue().longValue();
+        final int exponent = -amount.scale();
+        final Pair<Long, Integer> resultAndTimes = removeFactorsForBase(value, 10);
+        final int postFactoringExponent = exponent + resultAndTimes.getRight();
+        final Pair<Long, Integer> valueAndExponent = ensureExponentIsMultipleOf3(resultAndTimes.getLeft(), postFactoringExponent);
+        return valueAndExponent.getLeft() + new SuffixFormatter().format(quantity.getFormat(), valueAndExponent.getRight());
+    }
+
+    private Pair<Long, Integer> ensureExponentIsMultipleOf3(final long mantissa, final int exponent) {
+        final long exponentRemainder = exponent % 3;
+        if (exponentRemainder == 1 || exponentRemainder == -2) {
+            return new Pair<>(mantissa * 10, exponent - 1);
+        } else if (exponentRemainder == -1 || exponentRemainder == 2) {
+            return new Pair<>(mantissa * 100, exponent - 2);
+        } else {
+            return new Pair<>(mantissa, exponent);
+        }
+    }
+
+    private Pair<Long, Integer> removeFactorsForBase(final long value, final int base) {
+        int times = 0;
+        long result = value;
+        while (result >= base && result % base == 0) {
+            times++;
+            result = result / base;
+        }
+        return new Pair<>(result, times);
+    }
+
+}
+

kubernetes/src/main/java/io/kubernetes/client/custom/SuffixFormatter.java

@@ -0,0 +1,107 @@
+package io.kubernetes.client.custom;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class SuffixFormatter {
+
+    private static final Map<String, BaseExponent> suffixToBinary = new HashMap<String, BaseExponent>() {
+        {
+            put("", new BaseExponent(2, 0, Quantity.Format.BINARY_SI));
+            put("Ki", new BaseExponent(2, 10, Quantity.Format.BINARY_SI));
+            put("Mi", new BaseExponent(2, 20, Quantity.Format.BINARY_SI));
+            put("Gi", new BaseExponent(2, 30, Quantity.Format.BINARY_SI));
+            put("Ti", new BaseExponent(2, 40, Quantity.Format.BINARY_SI));
+            put("Pi", new BaseExponent(2, 50, Quantity.Format.BINARY_SI));
+            put("Ei", new BaseExponent(2, 60, Quantity.Format.BINARY_SI));
+        }
+    };
+
+    private static final Map<String, BaseExponent> suffixToDecimal = new HashMap<String, BaseExponent>() {
+        {
+            put("n", new BaseExponent(10, -9, Quantity.Format.DECIMAL_SI));
+            put("u", new BaseExponent(10, -6, Quantity.Format.DECIMAL_SI));
+            put("m", new BaseExponent(10, -3, Quantity.Format.DECIMAL_SI));
+            put("", new BaseExponent(10, 0, Quantity.Format.DECIMAL_SI));
+            put("k", new BaseExponent(10, 3, Quantity.Format.DECIMAL_SI));
+            put("M", new BaseExponent(10, 6, Quantity.Format.DECIMAL_SI));
+            put("G", new BaseExponent(10, 9, Quantity.Format.DECIMAL_SI));
+            put("T", new BaseExponent(10, 12, Quantity.Format.DECIMAL_SI));
+            put("P", new BaseExponent(10, 15, Quantity.Format.DECIMAL_SI));
+            put("E", new BaseExponent(10, 18, Quantity.Format.DECIMAL_SI));
+        }
+    };
+
+    private static final Map<BaseExponent, String> decimalToSuffix = new HashMap<BaseExponent, String>() {
+        {
+            for (Entry<String, BaseExponent> entry : suffixToDecimal.entrySet()) {
+                put(entry.getValue(), entry.getKey());
+            }
+        }
+    };
+
+    private static final Map<BaseExponent, String> binaryToSuffix = new HashMap<BaseExponent, String>() {
+        {
+            for (Entry<String, BaseExponent> entry : suffixToBinary.entrySet()) {
+                put(entry.getValue(), entry.getKey());
+            }
+        }
+    };
+
+    public BaseExponent parse(final String suffix) {
+        final BaseExponent decimalSuffix = suffixToDecimal.get(suffix);
+        if (decimalSuffix != null) {
+            return decimalSuffix;
+        }
+
+        final BaseExponent binarySuffix = suffixToBinary.get(suffix);
+        if (binarySuffix != null) {
+            return binarySuffix;
+        }
+
+        if (suffix.length() > 0 && (suffix.charAt(0) == 'E' || suffix.charAt(0) == 'e')) {
+            return extractDecimalExponent(suffix);
+        }
+
+        throw new QuantityFormatException("Could not parse suffix");
+    }
+
+    private BaseExponent extractDecimalExponent(String suffix) {
+        try {
+            final int exponent = Integer.parseInt(suffix.substring(1));
+            return new BaseExponent(10, exponent, Quantity.Format.DECIMAL_EXPONENT);
+        } catch (final NumberFormatException e) {
+            throw new QuantityFormatException("Can't parse decimal exponent from " + suffix.substring(1));
+        }
+    }
+
+    public String format(final Quantity.Format format, final int exponent) {
+        switch (format) {
+            case DECIMAL_SI:
+                return getDecimalSiSuffix(exponent);
+            case BINARY_SI:
+                return getBinarySiSuffix(exponent);
+            case DECIMAL_EXPONENT:
+                return exponent == 0 ? "" : "e" + exponent;
+            default:
+                throw new IllegalStateException("Can't format " + format + " with exponent " + exponent);
+        }
+    }
+
+    private String getBinarySiSuffix(int exponent) {
+        final String suffix = binaryToSuffix.get(new BaseExponent(2, exponent, Quantity.Format.BINARY_SI));
+        if (suffix == null) {
+            throw new IllegalArgumentException("No suffix for exponent" + exponent);
+        }
+        return suffix;
+    }
+
+    private String getDecimalSiSuffix(int exponent) {
+        final String suffix = decimalToSuffix.get(new BaseExponent(10, exponent, Quantity.Format.DECIMAL_SI));
+        if (suffix == null) {
+            throw new IllegalArgumentException("No suffix for exponent" + exponent);
+        }
+        return suffix;
+    }
+
+}