Add java source from simplemetrics.

1 files changed, 133 insertions, 0 deletions

diff --git a/container-core/src/main/java/com/yahoo/metrics/simple/Point.java b/container-core/src/main/java/com/yahoo/metrics/simple/Point.java
new file mode 100644
index 00000000000..672d05c1874
--- /dev/null
+++ b/container-core/src/main/java/com/yahoo/metrics/simple/Point.java
@@ -0,0 +1,133 @@
+// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.metrics.simple;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+
+import com.google.common.annotations.Beta;
+import com.google.common.collect.ImmutableList;
+import com.yahoo.collections.Tuple2;
+import com.yahoo.jdisc.Metric.Context;
+
+/**
+ * An efficiently comparable point in a sparse vector space.
+ *
+ * @author steinar
+ */
+@Beta
+public final class Point implements Context {
+
+    private final Value[] location;
+    private final String[] dimensions;
+
+    public Point(Map<String, ?> properties) {
+        this(buildParameters(properties));
+    }
+
+    private Point(Tuple2<String[], Value[]> dimensionsAndLocation) {
+        this(dimensionsAndLocation.first, dimensionsAndLocation.second);
+    }
+
+    /**
+     * Only to be used by simplemetrics itself.
+     *
+     * @param dimensions dimension name, Point takes ownership of the array
+     * @param location dimension values, Point takes ownership of the array
+     */
+    Point(String[] dimensions, Value[] location) {
+        this.dimensions = dimensions;
+        this.location = location;
+    }
+
+    private static final Point theEmptyPoint = new Point(new String[0], new Value[0]);
+
+    /** the canonical 0-dimensional Point. */
+    public static Point emptyPoint() { return theEmptyPoint; }
+
+    private static Tuple2<String[], Value[]> buildParameters(Map<String, ?> properties) {
+        String[] dimensions = properties.keySet().toArray(new String[0]);
+        Arrays.sort(dimensions);
+        Value[] location = new Value[dimensions.length];
+        for (int i = 0; i < dimensions.length; ++i) {
+            location[i] = Value.of(String.valueOf(properties.get(dimensions[i])));
+        }
+        return new Tuple2<>(dimensions, location);
+
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        Point other = (Point) obj;
+        if (!Arrays.equals(dimensions, other.dimensions)) {
+            return false;
+        }
+        if (!Arrays.equals(location, other.location)) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + Arrays.hashCode(dimensions);
+        result = prime * result + Arrays.hashCode(location);
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        final int maxLen = 3;
+        StringBuilder builder = new StringBuilder();
+        builder.append("Point [location=")
+                .append(Arrays.asList(location).subList(0, Math.min(location.length, maxLen)))
+                .append(", dimensions=")
+                .append(Arrays.asList(dimensions).subList(0, Math.min(dimensions.length, maxLen)))
+                .append("]");
+        return builder.toString();
+    }
+
+    /**
+     * Get an immutable list view of the values for each dimension.
+     */
+    public List<Value> location() {
+        return ImmutableList.copyOf(location);
+    }
+
+    /**
+     * Get an immutable list view of the names of each dimension.
+     */
+    public List<String> dimensions() {
+        return ImmutableList.copyOf(dimensions);
+    }
+
+    /**
+     * Get the number of dimensions defined for this Point, i.e. the size of the
+     * collection returned by {@link #dimensions()}.
+     */
+    public int dimensionality() {
+        return dimensions.length;
+    }
+
+    /** package private accessor only for simplemetrics itself */
+    String[] getDimensions() {
+        return dimensions;
+    }
+
+    /** package private accessor only for simplemetrics itself */
+    Value[] getLocation() {
+        return location;
+    }
+
+}