01 package gate.creole.morph;
02
03 import java.util.HashMap;
04 import java.util.Iterator;
05
06 /**
07 * <p>Title: Storage.java </p>
08 * <p>Description: This class is used as the storage in the system, where
09 * all the declared variables and their appropriate values are stored </p>
10 */
11 public class Storage {
12
13 /**
14 * Stores variable name as the key, and its variable values as values of these
15 * keys
16 */
17 private HashMap variables;
18
19 /**
20 * Constructor
21 */
22 public Storage() {
23 variables = new HashMap();
24 }
25
26 /**
27 * Adds the variable name and its value into the hashTable
28 * @param varName name of the variable
29 * @param varValue value for the variable
30 * @return true if variable doesnot exist, false otherwise
31 */
32 public boolean add(String varName, String varValue) {
33 if(variables.containsKey(varName)) {
34 return false;
35 } else {
36
37 // before storing varValue try to find if it is
38 // a Character Range
39 // a Character Set
40 // a Sting Set
41
42 variables.put(varName,varValue);
43 return true;
44 }
45 }
46
47 /**
48 * This method looks into the hashtable and searches for the value of the
49 * given variable
50 * @param varName
51 * @return value of the variable if variable found in the table,null otherwise
52 */
53 public String get(String varName) {
54 String varValue = (String)(variables.get(varName));
55 return varValue;
56 }
57
58 /**
59 * This method checks for the existance of the variable into the hashtable
60 * @param varName
61 * @return true if variable exists, false otherwise
62 */
63 public boolean isExist(String varName) {
64 if(variables.containsKey(varName)) {
65 return true;
66 } else {
67 return false;
68 }
69 }
70
71 /**
72 * Update the variable with the new value. If variable doesnot exist, add it
73 * to the hashtable
74 * @param varName name of the variable to be updated, or added
75 * @param varValue value of the variable
76 */
77 public void update(String varName,String varValue) {
78 variables.put(varName,varValue);
79
80 }
81
82 /**
83 * This method returns names of all the variables available in the hashtable
84 * @return array of Strings - names of the variables
85 */
86 public String [] getVarNames() {
87 Iterator iter = variables.keySet().iterator();
88 String [] varNames = new String[variables.size()];
89 int i=0;
90 while(iter.hasNext()) {
91 varNames[i] = (String)(iter.next());
92 i++;
93 }
94 return varNames;
95 }
96 }
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