Added implementation of GrantedAuthoritiesContainer to allow refactoring of duplication in various preauth details classes

core/src/main/java/org/springframework/security/GrantedAuthoritiesContainerImpl.java

@@ -0,0 +1,27 @@
+package org.springframework.security;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.springframework.util.Assert;
+
+public class GrantedAuthoritiesContainerImpl implements MutableGrantedAuthoritiesContainer {
+	private List authorities;
+
+	public void setGrantedAuthorities(GrantedAuthority[] newAuthorities) {
+		this.authorities = new ArrayList(newAuthorities.length);
+		authorities.addAll(Arrays.asList(newAuthorities));
+	}
+
+	public GrantedAuthority[] getGrantedAuthorities() {
+		Assert.notNull(authorities, "Granted authorities have not been set");
+		return (GrantedAuthority[]) authorities.toArray(new GrantedAuthority[authorities.size()]);
+	}
+	
+	public String toString() {
+		StringBuffer sb = new StringBuffer();
+		sb.append("Authorities: ").append(authorities);
+		return sb.toString();
+	}
+}