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.fix;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.dom.ASTNode;
  import org.eclipse.wst.jsdt.core.dom.JavaScriptUnit;
  import org.eclipse.wst.jsdt.internal.corext.fix.CleanUpConstants;
  import org.eclipse.wst.jsdt.internal.corext.fix.ExpressionsFix;
  import org.eclipse.wst.jsdt.internal.corext.fix.IFix;
  import org.eclipse.wst.jsdt.ui.text.java.IProblemLocation;
  
  public class ExpressionsCleanUp extends AbstractCleanUp {
  		
  	public ExpressionsCleanUp(Map options) {
  		super(options);
  	}
  	
  	public ExpressionsCleanUp() {
  		super();
  	}
  	
  	/**
  	 * {@inheritDoc}
  	 */
  	public boolean requireAST(IJavaScriptUnit unit) throws CoreException {
  		boolean usePrentheses= isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES);
  		if (!usePrentheses)
  			return false;
  		
  		return isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES_ALWAYS) ||
  		       isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES_NEVER);
  	}
  	
  	public IFix createFix(JavaScriptUnit compilationUnit) throws CoreException {
  		if (compilationUnit == null)
  			return null;
  		
  		boolean usePrentheses= isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES);
  		if (!usePrentheses)
  			return null;
  		
  		return ExpressionsFix.createCleanUp(compilationUnit, 
  				isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES_ALWAYS),
  				isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES_NEVER));
  	}
  	
  	/**
  	 * {@inheritDoc}
  	 */
  	public IFix createFix(JavaScriptUnit compilationUnit, IProblemLocation[] problems) throws CoreException {
  		return createFix(compilationUnit);
  	}
  
  	public Map getRequiredOptions() {
  		return null;
  	}
  	
  	/**
  	 * {@inheritDoc}
  	 */
  	public String[] getDescriptions() {
  		List result= new ArrayList();
  		if (isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES) && isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES_ALWAYS)) 
  			result.add(MultiFixMessages.ExpressionsCleanUp_addParanoiac_description);
  		
  		if (isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES) && isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES_NEVER)) 
  			result.add(MultiFixMessages.ExpressionsCleanUp_removeUnnecessary_description);
  		
  		return (String[])result.toArray(new String[result.size()]);
  	}
  	
  	public String getPreview() {
  		StringBuffer buf= new StringBuffer();
  		
  		if (isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES) && isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES_ALWAYS)) {
  			buf.append("var b= (((i > 0) && (i < 10)) || (i == 50));\n"); //$NON-NLS-1$
  		} else if (isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES) && isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES_NEVER)) {
  			buf.append("var b= i > 0 && i < 10 || i == 50;\n"); //$NON-NLS-1$
  		} else {
  			buf.append("var b= (i > 0 && i < 10 || i == 50);\n"); //$NON-NLS-1$
  		}
  		
  		return buf.toString();
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public boolean canFix(JavaScriptUnit compilationUnit, IProblemLocation problem) throws CoreException {
  		if (isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES) && isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES_ALWAYS)) {
  			IFix fix= ExpressionsFix.createAddParanoidalParenthesisFix(compilationUnit, new ASTNode[] {problem.getCoveredNode(compilationUnit)});
  			if (fix != null)
  				return true;
  		}
  		if (isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES) && isEnabled(CleanUpConstants.EXPRESSIONS_USE_PARENTHESES_NEVER)) {
  			IFix fix= ExpressionsFix.createRemoveUnnecessaryParenthesisFix(compilationUnit, new ASTNode[] {problem.getCoveredNode(compilationUnit)});
  			if (fix != null)
  				return true;
  		}
  		return false;
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public int maximalNumberOfFixes(JavaScriptUnit compilationUnit) {
  		return -1;
  	}
  }
  