content: /*******************************************************************************
   * Copyright (c) 2000, 2008 IBM Corporation and others.
   * 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:
   *     IBM Corporation - initial API and implementation
   *******************************************************************************/
  package org.eclipse.wst.jsdt.internal.ui.actions;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.eclipse.core.runtime.IStatus;
  import org.eclipse.ui.dialogs.ISelectionStatusValidator;
  import org.eclipse.wst.jsdt.core.dom.IFunctionBinding;
  import org.eclipse.wst.jsdt.core.dom.ITypeBinding;
  import org.eclipse.wst.jsdt.core.dom.IVariableBinding;
  import org.eclipse.wst.jsdt.internal.corext.util.Messages;
  import org.eclipse.wst.jsdt.internal.ui.dialogs.StatusInfo;
  
  public class GenerateConstructorUsingFieldsValidator implements ISelectionStatusValidator {
  
  	private GenerateConstructorUsingFieldsSelectionDialog fDialog;
  
  	private final int fEntries;
  
  	private List fSignatures;
  
  	private ITypeBinding fType= null;
  
  	public GenerateConstructorUsingFieldsValidator(GenerateConstructorUsingFieldsSelectionDialog dialog, ITypeBinding type, int entries) {
  		fEntries= entries;
  		fDialog= dialog;
  		fType= type;
  		fSignatures= getExistingConstructorSignatures();
  	}
  
  	public GenerateConstructorUsingFieldsValidator(int entries) {
  		fEntries= entries;
  		fType= null;
  	}
  
  	private int countSelectedFields(Object[] selection) {
  		int count= 0;
  		for (int index= 0; index < selection.length; index++) {
  			if (selection[index] instanceof IVariableBinding)
  				count++;
  		}
  		return count;
  	}
  
  	private void createSignature(final IFunctionBinding constructor, StringBuffer buffer, Object[] selection) {
  		ITypeBinding types[]= constructor.getParameterTypes();
  		for (int index= 0; index < types.length; index++)
  			buffer.append(types[index].getName());
  		if (selection != null) {
  			for (int index= 0; index < selection.length; index++)
  				if (selection[index] instanceof IVariableBinding)
  					buffer.append(((IVariableBinding) selection[index]).getType().getErasure().getName());
  		}
  	}
  
  	private List getExistingConstructorSignatures() {
  		List existing= new ArrayList();
  		IFunctionBinding[] methods= fType.getDeclaredMethods();
  		for (int index= 0; index < methods.length; index++) {
  			if (methods[index].isConstructor()) {
  				StringBuffer buffer= new StringBuffer();
  				createSignature(methods[index], buffer, null);
  				existing.add(buffer.toString());
  			}
  		}
  		return existing;
  	}
  
  	public IStatus validate(Object[] selection) {
  		StringBuffer buffer= new StringBuffer();
  		final IFunctionBinding constructor= fDialog.getSuperConstructorChoice();
  		createSignature(constructor, buffer, selection);
  		if (fSignatures.contains(buffer.toString()))
  			return new StatusInfo(IStatus.WARNING, ActionMessages.GenerateConstructorUsingFieldsAction_error_duplicate_constructor); 
  		return new StatusInfo(IStatus.INFO, Messages.format(ActionMessages.GenerateConstructorUsingFieldsAction_fields_selected, new Object[] { String.valueOf(countSelectedFields(selection)), String.valueOf(fEntries)})); 
  	}
  }
  