first commit

hrmsEjb/org/nfunk/jep/SymbolTable.java

@@ -0,0 +1,97 @@
+package org.nfunk.jep;
+
+import java.util.Enumeration;
+import java.util.Hashtable;
+
+public class SymbolTable extends Hashtable {
+  protected VariableFactory vf;
+  
+  public SymbolTable(VariableFactory paramVariableFactory) {
+    this.vf = paramVariableFactory;
+  }
+  
+  private SymbolTable() {}
+  
+  public Object get(Object paramObject) {
+    return getValue(paramObject);
+  }
+  
+  public Object getValue(Object paramObject) {
+    Variable variable = super.get(paramObject);
+    return (variable == null) ? null : variable.getValue();
+  }
+  
+  public Variable getVar(String paramString) {
+    return super.get(paramString);
+  }
+  
+  public Object put(Object paramObject1, Object paramObject2) {
+    return makeVarIfNeeded((String)paramObject1, paramObject2);
+  }
+  
+  public boolean setVarValue(String paramString, Object paramObject) {
+    Variable variable = super.get(paramString);
+    return (variable != null) ? variable.setValue(paramObject) : false;
+  }
+  
+  public Variable addVariable(String paramString, Object paramObject) {
+    Variable variable = super.get(paramString);
+    if (variable != null)
+      return null; 
+    variable = this.vf.createVariable(paramString, paramObject);
+    super.put(paramString, variable);
+    variable.setValidValue(true);
+    return variable;
+  }
+  
+  public Variable addConstant(String paramString, Object paramObject) {
+    Variable variable = addVariable(paramString, paramObject);
+    if (variable != null)
+      variable.setIsConstant(true); 
+    return variable;
+  }
+  
+  public Variable makeVarIfNeeded(String paramString, Object paramObject) {
+    Variable variable = super.get(paramString);
+    if (variable != null) {
+      variable.setValue(paramObject);
+      return variable;
+    } 
+    variable = this.vf.createVariable(paramString, paramObject);
+    super.put(paramString, variable);
+    return variable;
+  }
+  
+  public Variable makeVarIfNeeded(String paramString) {
+    Variable variable = super.get(paramString);
+    if (variable != null)
+      return variable; 
+    variable = this.vf.createVariable(paramString, null);
+    super.put(paramString, variable);
+    return variable;
+  }
+  
+  public String toString() {
+    StringBuffer stringBuffer = new StringBuffer();
+    Enumeration enumeration = elements();
+    while (enumeration.hasMoreElements()) {
+      Variable variable = (Variable)enumeration.nextElement();
+      stringBuffer.append(variable.toString());
+      stringBuffer.append("\n");
+    } 
+    return stringBuffer.toString();
+  }
+  
+  public void clearValues() {
+    Enumeration enumeration = elements();
+    while (enumeration.hasMoreElements()) {
+      Variable variable = (Variable)enumeration.nextElement();
+      if (!variable.isConstant())
+        variable.setValidValue(false); 
+    } 
+  }
+  
+  public VariableFactory getVariableFactory() {
+    return this.vf;
+  }
+}