Prune imports & tidy

[ifi-stolz-refaktor.git] / software / no.uio.ifi.refaktor / src / no / uio / ifi / refaktor / analyze / analyzers / ExtractAndMoveMethodSelectionAnalyzer.java

package no.uio.ifi.refaktor.analyze.analyzers;

import java.util.Iterator;
import no.uio.ifi.refaktor.analyze.collectors.PrefixesCollector;
import no.uio.ifi.refaktor.change.changers.ExtractAndMoveMethodChanger;
import no.uio.ifi.refaktor.prefix.Prefix;
import no.uio.ifi.refaktor.prefix.PrefixSet;
import no.uio.ifi.refaktor.textselection.CompilationUnitTextSelection;

//TODO: rewrite docs
/**
 * A property extractor that collects all the expression prefixes within a selection
 * (see {@link PrefixesCollector}) that forms the base for calculating the
 * candidates for the move refactoring, and also the unfixes 
 * that are non-candidates for the move refactoring. 
 * 
 * The set of prefixes that are not enclosing any unfixes is put in the set of safe prefixes.
 * This set is used by an Extract and Move Method refactoring to find a suitable target
 * for the Move Method. 
 * 
 * The class is typically used by the {@link ExtractAndMoveMethodChanger}.
 */
public class ExtractAndMoveMethodSelectionAnalyzer extends AbstractSelectionAnalyzer {

	/**
	 * @param selection The selection containing the possible targets of the refactoring
	 */
	public ExtractAndMoveMethodSelectionAnalyzer(CompilationUnitTextSelection selection) {
		super(selection);
	}

	/**
	 * Removes prefixes unusable for ExtractAndMoveMethod refactoring: 
	 * prefixes with simple expression and only one occurrence
	 * @param safePrefixes The collected prefixes; will be edited
	 */
	protected void removeUnusablePrefixes(PrefixSet safePrefixes) {
		for (Iterator<Prefix> iter = safePrefixes.iterator(); iter.hasNext();) {
			final Prefix i = iter.next();
			//final IVariableBinding ie = i.getVariableBindingOfFirstExpression();
			if (prefixHasSimpleExpressionAndOnlyOneOccurrence(i)
					/* Filter out non-final fields as well? */
					//|| (ONLY_SAFE && ie.isField() && !Modifier.isFinal(ie.getModifiers()))
					)
				iter.remove();
		}
	}
	
}