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.JavaScriptUnit;
  import org.eclipse.wst.jsdt.internal.corext.fix.CleanUpConstants;
  import org.eclipse.wst.jsdt.internal.corext.fix.ControlStatementsFix;
  import org.eclipse.wst.jsdt.internal.corext.fix.IFix;
  import org.eclipse.wst.jsdt.ui.text.java.IProblemLocation;
  
  public class ControlStatementsCleanUp extends AbstractCleanUp {
  	
  	public ControlStatementsCleanUp(Map options) {
  		super(options);
      }
  	
  	public ControlStatementsCleanUp() {
  		super();
  	}
  	
  	/**
  	 * {@inheritDoc}
  	 */
  	public boolean requireAST(IJavaScriptUnit unit) throws CoreException {
  		boolean useBlocks= isEnabled(CleanUpConstants.CONTROL_STATEMENTS_USE_BLOCKS);
  		
  		if (!useBlocks)
  			return false;
  		
  		return isEnabled(CleanUpConstants.CONTROL_STATMENTS_USE_BLOCKS_ALWAYS) ||
  		       isEnabled(CleanUpConstants.CONTROL_STATMENTS_USE_BLOCKS_NEVER) ||
  		       isEnabled(CleanUpConstants.CONTROL_STATMENTS_USE_BLOCKS_NO_FOR_RETURN_AND_THROW);
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public IFix createFix(JavaScriptUnit compilationUnit) throws CoreException {
  		if (compilationUnit == null)
  			return null;
  		
  		boolean useBlocks= isEnabled(CleanUpConstants.CONTROL_STATEMENTS_USE_BLOCKS);
  		if (!useBlocks)
  			return null;
  		
  		return ControlStatementsFix.createCleanUp(compilationUnit,
  				isEnabled(CleanUpConstants.CONTROL_STATMENTS_USE_BLOCKS_ALWAYS),
  				isEnabled(CleanUpConstants.CONTROL_STATMENTS_USE_BLOCKS_NEVER),
  				isEnabled(CleanUpConstants.CONTROL_STATMENTS_USE_BLOCKS_NO_FOR_RETURN_AND_THROW));
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public IFix createFix(JavaScriptUnit compilationUnit, IProblemLocation[] problems) throws CoreException {
  		//No warnings generated by the compiler
  		return null;
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public Map getRequiredOptions() {
  		return null;
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public String[] getDescriptions() {
  		List result= new ArrayList();
  		if (isEnabled(CleanUpConstants.CONTROL_STATEMENTS_USE_BLOCKS) && isEnabled(CleanUpConstants.CONTROL_STATMENTS_USE_BLOCKS_ALWAYS))
  			result.add(MultiFixMessages.CodeStyleMultiFix_ConvertSingleStatementInControlBodeyToBlock_description);
  		if (isEnabled(CleanUpConstants.CONTROL_STATEMENTS_USE_BLOCKS) && isEnabled(CleanUpConstants.CONTROL_STATMENTS_USE_BLOCKS_NEVER))
  			result.add(MultiFixMessages.ControlStatementsCleanUp_RemoveUnnecessaryBlocks_description);
  		if (isEnabled(CleanUpConstants.CONTROL_STATEMENTS_USE_BLOCKS) && isEnabled(CleanUpConstants.CONTROL_STATMENTS_USE_BLOCKS_NO_FOR_RETURN_AND_THROW))
  			result.add(MultiFixMessages.ControlStatementsCleanUp_RemoveUnnecessaryBlocksWithReturnOrThrow_description);
  		
  		return (String[])result.toArray(new String[result.size()]);
  	}
  	
  	public String getPreview() {
  		StringBuffer buf= new StringBuffer();
  		
  		if (isEnabled(CleanUpConstants.CONTROL_STATEMENTS_USE_BLOCKS) && isEnabled(CleanUpConstants.CONTROL_STATMENTS_USE_BLOCKS_ALWAYS)) {
  			buf.append("if (obj == null) {\n"); //$NON-NLS-1$
  			buf.append("    throw ('some exception');\n"); //$NON-NLS-1$
  			buf.append("}\n"); //$NON-NLS-1$
  			
  			buf.append("if (ids.length > 0) {\n"); //$NON-NLS-1$
  			buf.append("    alert(ids[0]);\n"); //$NON-NLS-1$
  			buf.append("} else {\n"); //$NON-NLS-1$
  			buf.append("    return;\n"); //$NON-NLS-1$
  			buf.append("}\n"); //$NON-NLS-1$
  		} else if (isEnabled(CleanUpConstants.CONTROL_STATEMENTS_USE_BLOCKS) && isEnabled(CleanUpConstants.CONTROL_STATMENTS_USE_BLOCKS_NEVER)){
  			buf.append("if (obj == null)\n"); //$NON-NLS-1$
  			buf.append("    throw ('some exception');\n"); //$NON-NLS-1$
  			buf.append("\n"); //$NON-NLS-1$
  			
  			buf.append("if (ids.length > 0)\n"); //$NON-NLS-1$
  			buf.append("    alert(ids[0]);\n"); //$NON-NLS-1$
  			buf.append("else\n"); //$NON-NLS-1$
  			buf.append("    return;\n"); //$NON-NLS-1$
  			buf.append("\n"); //$NON-NLS-1$
  		} else if (isEnabled(CleanUpConstants.CONTROL_STATEMENTS_USE_BLOCKS) && isEnabled(CleanUpConstants.CONTROL_STATMENTS_USE_BLOCKS_NO_FOR_RETURN_AND_THROW)) {
  			buf.append("if (obj == null)\n"); //$NON-NLS-1$
  			buf.append("    throw ('some exception');\n"); //$NON-NLS-1$
  			buf.append("\n"); //$NON-NLS-1$
  			
  			buf.append("if (ids.length > 0) {\n"); //$NON-NLS-1$
  			buf.append("    alert(ids[0]);\n"); //$NON-NLS-1$
  			buf.append("} else \n"); //$NON-NLS-1$
  			buf.append("    return;\n"); //$NON-NLS-1$
  			buf.append("\n"); //$NON-NLS-1$
  		} else {
  			buf.append("if (obj == null) {\n"); //$NON-NLS-1$
  			buf.append("    throw ('some exception');\n"); //$NON-NLS-1$
  			buf.append("}\n"); //$NON-NLS-1$
  			
  			buf.append("if (ids.length > 0) {\n"); //$NON-NLS-1$
  			buf.append("    alert(ids[0]);\n"); //$NON-NLS-1$
  			buf.append("} else \n"); //$NON-NLS-1$
  			buf.append("    return;\n"); //$NON-NLS-1$
  			buf.append("\n"); //$NON-NLS-1$
  		}
  		
  		return buf.toString();
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public boolean canFix(JavaScriptUnit compilationUnit, IProblemLocation problem) throws CoreException {
  		return false;
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public int maximalNumberOfFixes(JavaScriptUnit compilationUnit) {
  		return -1;
  	}
  }
  