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+/*
+
+Copyright (c) Xerox Corporation 1998-2002. All rights reserved.
+
+Use and copying of this software and preparation of derivative works based
+upon this software are permitted. Any distribution of this software or
+derivative works must comply with all applicable United States export control
+laws.
+
+This software is made available AS IS, and Xerox Corporation makes no warranty
+about the software, its performance or its conformity to any specification.
+
+|<--- this code is formatted to fit into 80 columns --->|
+|<--- this code is formatted to fit into 80 columns --->|
+|<--- this code is formatted to fit into 80 columns --->|
+
+*/
+package telecom;
+import java.util.Vector;
+import java.util.Enumeration;
+
+/**
+ * A call supports the process of a customer trying to
+ * connect to others.
+ */
+public class Call {
+
+ private Customer caller, receiver;
+ private Vector connections = new Vector();
+
+ /**
+ * Create a new call connecting caller to receiver
+ * with a new connection. This should really only be
+ * called by Customer.call(..)
+ */
+ public Call(Customer caller, Customer receiver) {
+ this.caller = caller;
+ this.receiver = receiver;
+ Connection c;
+ if (receiver.localTo(caller)) {
+ c = new Local(caller, receiver);
+ } else {
+ c = new LongDistance(caller, receiver);
+ }
+ connections.addElement(c);
+ }
+
+ /**
+ * picking up a call completes the current connection
+ * (this means that you shouldnt merge calls until
+ * they are completed)
+ */
+ public void pickup() {
+ Connection connection = (Connection)connections.lastElement();
+ connection.complete();
+ }
+
+
+ /**
+ * Is the call in a connected state?
+ */
+ public boolean isConnected(){
+ return ((Connection)connections.lastElement()).getState()
+ == Connection.COMPLETE;
+ }
+
+ /**
+ * hanging up a call drops the connection
+ */
+ public void hangup(Customer c) {
+ for(Enumeration e = connections.elements(); e.hasMoreElements();) {
+ ((Connection)e.nextElement()).drop();
+ }
+ }
+
+ /**
+ * is Customer c one of the customers in this call?
+ */
+ public boolean includes(Customer c){
+ boolean result = false;
+ for(Enumeration e = connections.elements(); e.hasMoreElements();) {
+ result = result || ((Connection)e.nextElement()).connects(c);
+ }
+ return result;
+ }
+
+ /**
+ * Merge all connections from call 'other' into 'this'
+ */
+ public void merge(Call other){
+ for(Enumeration e = other.connections.elements(); e.hasMoreElements();){
+ Connection conn = (Connection)e.nextElement();
+ other.connections.removeElement(conn);
+ connections.addElement(conn);
+ }
+ }
+}