add NehrpSiteClass; delete Vs30

src/main/java/gov/usgs/earthquake/nshmp/calc/Vs30.java

-package gov.usgs.earthquake.nshmp.calc;
-
-/**
- * Identifiers for commonly used values of Vs30. These correspond to the NEHERP
- * site classes that have histroically been supported by the NSHMp in hazard
- * calculations.
- *
- * @author U.S. Geological Survey
- */
-@Deprecated
-public enum Vs30 {
-
-  /** NEHRP site class A. */
-  VS_2000("Site class A"),
-
-  /** NEHRP site class B. */
-  VS_1150("Site class B"),
-
-  /** NEHRP B/C boundary site class. */
-  VS_760("B/C boundary"),
-
-  /** NEHRP site class C. */
-  VS_537("Site class C"),
-
-  /** NEHRP C/D boundary site class. */
-  VS_360("C/D boundary"),
-
-  /** NEHRP site class D. */
-  VS_259("Site class D"),
-
-  /** NEHRP D/E boundary site class. */
-  VS_180("D/E boundary");
-
-  private String label;
-  private double value;
-
-  private Vs30(String label) {
-    this.label = label;
-    this.value = Double.valueOf(name().substring(3));
-  }
-
-  @Override
-  public String toString() {
-    return this.name().substring(3) + " m/s (" + label + ")";
-  }
-
-  /**
-   * Return the Vs30 value for this identifier.
-   */
-  public double value() {
-    return value;
-  }
-
-  /**
-   * Create a Vs30 constant from a Vs30 {@code value}.
-   * @param value to process
-   */
-  public static Vs30 fromValue(double value) {
-    String name = "VS_" + (int) value;
-    return Enum.valueOf(Vs30.class, name);
-  }
-
-}

src/main/java/gov/usgs/earthquake/nshmp/gmm/NehrpSiteClass.java

+package gov.usgs.earthquake.nshmp.gmm;
+
+/**
+ * NEHRP site class identifier.
+ *
+ * <p>Over time, the equivalent Vs30 values for each site class have changed
+ * slightly and are documented with each NSHM.
+ *
+ * @author U.S. Geological Survey
+ */
+enum NehrpSiteClass {
+
+  /** Site class A, very hard rock. */
+  A("very hard rock"),
+
+  /** Site class A/B boundary, hard rock. */
+  AB("hard rock"),
+
+  /** Site class B, medium hard rock. */
+  B("medium hard rock"),
+
+  /** Site class B/C boundary, soft rock. */
+  BC("soft rock"),
+
+  /** Site class C, very dense soil or hard clay. */
+  C("very dense soil or hard clay"),
+
+  /** Site class C/D boundary, dense sand or very stiff clay. */
+  CD("dense sand or very stiff clay"),
+
+  /** Site class D, medium dense sand or stiff clay. */
+  D("medium dense sand or stiff clay"),
+
+  /** Site class D/E boundary, loose sand or medium stiff clay. */
+  DE("loose sand or medium stiff clay"),
+
+  /** Site class E, very loose sand or soft clay. */
+  E("very loose sand or soft clay");
+
+  private final String condition;
+
+  private NehrpSiteClass(String condition) {
+    this.condition = condition;
+  }
+
+  public String condition() {
+    return condition;
+  }
+}