1 files changed, 84 insertions, 0 deletions
diff --git a/org.eclipse.m2e.editor/src/org/eclipse/m2e/editor/pom/ValueProvider.java b/org.eclipse.m2e.editor/src/org/eclipse/m2e/editor/pom/ValueProvider.java
new file mode 100644
index 00000000..4517a5b2
--- /dev/null
+++ b/org.eclipse.m2e.editor/src/org/eclipse/m2e/editor/pom/ValueProvider.java
@@ -0,0 +1,84 @@
+/*******************************************************************************
+ * Copyright (c) 2008-2010 Sonatype, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *      Sonatype, Inc. - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.m2e.editor.pom;
+
+import org.eclipse.emf.common.command.CompoundCommand;
+import org.eclipse.emf.edit.domain.EditingDomain;
+import org.eclipse.swt.custom.CCombo;
+import org.eclipse.swt.widgets.Button;
+import org.eclipse.swt.widgets.Control;
+import org.eclipse.swt.widgets.Text;
+
+/**
+ * Value provider for retrieving and creating holder element values
+ * 
+ * @author Eugene Kuleshov
+ */
+public abstract class ValueProvider<T> {
+
+  public abstract T getValue();
+  
+  public T create(EditingDomain editingDomain, CompoundCommand compoundCommand) {
+    return null;
+  }
+
+  public boolean isEmpty() {
+    return false;
+  }
+
+
+  /**
+   * Default value provider
+   */
+  public static class DefaultValueProvider<T> extends ValueProvider<T> {
+    private T value;
+
+    public DefaultValueProvider(T value) {
+      this.value = value;
+    }
+
+    public T getValue() {
+      return value;
+    }
+  }
+  
+  /**
+   * Default value provider
+   */
+  public abstract static class ParentValueProvider<T> extends ValueProvider<T> {
+    private final Control[] controls;
+
+    public ParentValueProvider(Control... controls) {
+      this.controls = controls;
+    }
+
+    public final boolean isEmpty() {
+      for(Control control : controls) {
+        if(control instanceof Text) {
+          if(!FormUtils.isEmpty(((Text) control).getText())) {
+            return false;
+          }
+        } else if(control instanceof CCombo) {
+          if(!FormUtils.isEmpty(((CCombo) control).getText())) {
+            return false;
+          }
+        } else if(control instanceof Button) {
+          if(!((Button) control).getSelection()) {
+            return false;
+          }
+        }
+      }
+      return true;
+    }
+  }
+  
+}