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[utils] / system / general / src / main / java / org / wamblee / system / adapters / ParameterValues.java

diff --git a/system/general/src/main/java/org/wamblee/system/adapters/ParameterValues.java b/system/general/src/main/java/org/wamblee/system/adapters/ParameterValues.java
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+/*
+ * Copyright 2008 the original author or authors.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */ 
+package org.wamblee.system.adapters;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.wamblee.system.core.DefaultRequiredInterface;
+import org.wamblee.system.core.RequiredInterface;
+import org.wamblee.system.core.Scope;
+
+public class ParameterValues {
+       private Class[] _types;
+       private ValueProvider[] _values;
+
+       /**
+        * Constructs the configuration. By default no constructor is selected and 
+        * one of {@link #select(Class...)} or 
+        * {@link #greedy()} must be called.  
+        * @param aClass Class to construct. 
+        */
+       public ParameterValues(Class[] aTypes) {
+               _types = aTypes; 
+               resetValues();   
+       }
+       
+       public Class[] getTypes() {
+               return _types;
+       }
+       
+       /**
+        * Sets argument i to be optional, meaning that null is allowed to be passed in.  
+        * @param aArg Argument to set.
+        */
+       public ParameterValues setOptional(int aArg) { 
+               _values[aArg] = new RequiredInterfaceProvider(new DefaultRequiredInterface(
+                               "arg" + aArg, _types[aArg], true));
+               return this; 
+       }
+       
+       /**
+        * Sets the argument i to a fixed value.  
+        * @param aArg Argument to set. 
+        * @param aValue Value. 
+        */
+       public ParameterValues setValue(int aArg, Object aValue) { 
+               _values[aArg] = new FixedValueProvider(aValue);
+               return this; 
+       }
+       
+       /**
+        * Resets the values. 
+        */
+       private void resetValues() { 
+               _values = new ValueProvider[_types.length];
+               for (int i = 0; i < _values.length; i++) { 
+                       _values[i] = new RequiredInterfaceProvider(new DefaultRequiredInterface(
+                                       "arg" + i, _types[i]));
+               }
+       }
+       
+       public List<RequiredInterface> getRequiredInterfaces() { 
+               List<RequiredInterface> result = new ArrayList<RequiredInterface>(); 
+               for (ValueProvider provider: _values) { 
+                       if ( provider instanceof RequiredInterfaceProvider) { 
+                               result.add( ((RequiredInterfaceProvider)provider).getRequiredInterface());
+                       }
+               }
+               return result; 
+       }
+
+       public Object[] values(Scope aScope) {
+               Object[] values = new Object[_values.length];
+               for (int i = 0; i < _values.length; i++) {
+                       values[i] = _values[i].getValue(aScope);
+               }
+               return values; 
+       }
+       
+}