Implemented the Comparable interface

Former-commit-id: 07d5fd34d76c296cfc2c1f049b285bbd9b05189a

src/main/java/org/owasp/dependencycheck/dependency/Evidence.java

@@ -23,7 +23,7 @@ package org.owasp.dependencycheck.dependency;
  *
  * @author Jeremy Long (jeremy.long@gmail.com)
  */
-public class Evidence {
+public class Evidence implements Comparable<Evidence> {
 
     /**
      * The confidence that the evidence is "high" quality.
@@ -222,4 +222,29 @@ public class Evidence {
     private boolean testEquality(String l, String r) {
         return l == null ? r == null : l.equalsIgnoreCase(r);
     }
+
+    /**
+     * Implementation of the comparable interface.
+     * @param o the evidence being compared
+     * @return an integer indicating the ordering of the two objects
+     */
+    public int compareTo(Evidence o) {
+        if (source.equals(o.source)) {
+            if (name.equals(o.name)) {
+                if (value.equals(o.value)) {
+                    if (confidence.equals(o.confidence)) {
+                        return 0; //they are equal
+                    } else {
+                        return confidence.compareTo(o.confidence);
+                    }
+                } else {
+                    return value.compareToIgnoreCase(o.value);
+                }
+            } else {
+                return name.compareToIgnoreCase(o.name);
+            }
+        } else {
+            return source.compareToIgnoreCase(o.source);
+        }
+    }
 }

src/main/java/org/owasp/dependencycheck/dependency/EvidenceCollection.java

@@ -21,6 +21,7 @@ package org.owasp.dependencycheck.dependency;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Set;
+import java.util.TreeSet;
 import org.owasp.dependencycheck.utils.Filter;
 
 /**
@@ -103,7 +104,7 @@ public class EvidenceCollection implements Iterable<Evidence> {
      * Creates a new EvidenceCollection.
      */
     public EvidenceCollection() {
-        list = new HashSet<Evidence>();
+        list = new TreeSet<Evidence>();
         weightedStrings = new HashSet<String>();
     }
 

src/main/java/org/owasp/dependencycheck/dependency/Identifier.java

@@ -22,7 +22,7 @@ package org.owasp.dependencycheck.dependency;
  *
  * @author Jeremy Long (jeremy.long@gmail.com)
  */
-public class Identifier {
+public class Identifier implements Comparable<Identifier> {
 
     /**
      * Constructs a new Identifier with the specified data.
@@ -165,4 +165,14 @@ public class Identifier {
         return hash;
     }
 
+    /**
+     * Implementation of the comparator interface. This compares the
+     * value of the identifier only.
+     *
+     * @param o the object being compared
+     * @return an integer indicating the ordering
+     */
+    public int compareTo(Identifier o) {
+        return this.value.compareTo(o.value);
+    }
 }