Refactor of query plan hash - add HashQueryPlan, HashQuery etc

src/main/java/com/avaje/ebeaninternal/api/HashQuery.java

@@ -0,0 +1,51 @@
+package com.avaje.ebeaninternal.api;
+
+/**
+ * A hash key for a query including both the query plan and bind values.
+ */
+public class HashQuery {
+
+  private final HashQueryPlan planHash;
+  
+  private final int bindHash;
+
+  /**
+   * Create the HashQuery.
+   */
+  public HashQuery(HashQueryPlan planHash, int bindHash) {
+    this.planHash = planHash;
+    this.bindHash = bindHash;
+  }
+
+  /**
+   * Return the query plan hash.
+   */
+  public HashQueryPlan getPlanHash() {
+    return planHash;
+  }
+
+  /**
+   * Return the bind values hash.
+   */
+  public int getBindHash() {
+    return bindHash;
+  }
+
+  public int hashCode() {
+    int hc = 31 * planHash.hashCode();
+    hc = 31 * hc + bindHash;
+    return hc;
+  }
+  
+  public boolean equals(Object obj) {
+    if (obj == this) {
+      return true;
+    }
+    if (!(obj instanceof HashQuery)) {
+      return false;
+    }
+    
+    HashQuery e = (HashQuery) obj;
+    return e.bindHash == bindHash && e.planHash.equals(planHash);
+  }
+}