first step towards ParameterList refactoring

src/main/java/org/scribe/model/Parameter.java

@@ -0,0 +1,50 @@
+package org.scribe.model;
+
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
+import org.scribe.exceptions.OAuthException;
+import org.scribe.utils.OAuthEncoder;
+
+/**
+ * @author: Pablo Fernandez
+ */
+public class Parameter implements Comparable<Parameter>
+{
+  private static final String UTF = "UTF8";
+
+  private final String key;
+  private final String value;
+
+  public Parameter(String key, String value)
+  {
+    this.key = key;
+    this.value = value;
+  }
+
+  public String asUrlEncodedPair()
+  {
+    return OAuthEncoder.encode(key).concat("=").concat(OAuthEncoder.encode(value));
+  }
+  
+  public boolean equals(Object other)
+  {
+    if(other == null) return false;
+    if(other == this) return true;
+    if(!(other instanceof Parameter)) return false;
+    
+    Parameter otherParam = (Parameter) other;
+    return otherParam.key.equals(key) && otherParam.value.equals(value);
+  }
+
+  public int hashCode()
+  {
+    return key.hashCode() + value.hashCode();
+  }
+
+  public int compareTo(Parameter parameter)
+  {
+    int keyDiff = key.compareTo(parameter.key);
+
+    return keyDiff != 0 ? keyDiff : value.compareTo(parameter.value);
+  }
+}