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src/FESI/Data/CompatibilityDescriptor.java

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+// ESLoader.java
+// FESI Copyright (c) Jean-Marc Lugrin, 1999
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+package FESI.Data;
+
+/**
+ * Descripe the compatibility of a method, allowing to
+ * postpone the choice of the method to call until all
+ * potentially compatible ones have been examined.
+ */
+class CompatibilityDescriptor {
+  int distance;
+  boolean [] convertToChar = null; // flag to indicate if conversion to char is needed
+  Object [] convertedArrays = null; // Converted array if any needed
+  
+/*   
+ * Create a new descrptor (note that there is a predefined one for
+ * incompatible parameters).
+ * @param distance -1 if incompatible, or evaluation of conversion distance
+ * @param convertToChar Optional flag for each parameter
+ * @param convertedArrays Optional list of converted arrays
+ */
+  CompatibilityDescriptor(int distance, 
+            boolean[] convertedToChar, 
+            Object[]  convertedArrays) {
+     this.distance = distance;
+     if (distance>=0) {
+       this.convertToChar = convertedToChar;
+       this.convertedArrays = convertedArrays;
+     }
+  }
+  
+  /** Return true if the method is compatible with the parameters */
+  public boolean isCompatible() {
+    return distance>=0;
+  }
+
+  /** Return the distance between perfect compatibility and this one */
+  public int getDistance() {
+    return distance;
+  }
+  
+  /** Convert the parameters for this method call */
+  public void convert(Object params[]) {
+    if (params != null && distance>=0) {
+      // Modify the parameters 
+      int n = params.length;
+      
+      if (convertToChar!=null) {
+          for (int i=0; i<n; i++) {
+              if (convertToChar[i]) {
+                  String s = (String) params[i];
+                  Character c = new Character(s.charAt(0));
+                  params[i] = c;
+              }
+          }
+      }
+      if (convertedArrays!=null) {
+          for (int i=0; i<n; i++) {
+              if (convertedArrays[i] != null) {
+                  params[i] = convertedArrays[i];
+              }
+          }
+      }
+    }
+      
+  } // convert
+            
+} // class CompatibilityDescriptor