DataflowAnomalyTableContentProvider.java

package net.sourceforge.pmd.eclipse.ui.views.dataflow;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import net.sourceforge.pmd.eclipse.util.Util;
import net.sourceforge.pmd.lang.java.rule.controversial.DaaRuleViolation;

import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.Viewer;

/**
 * Provides the Content for the DataflowAnomalyTable
 *
 * @author SebastianRaffel  ( 07.06.2005 )
 */
public class DataflowAnomalyTableContentProvider implements IStructuredContentProvider {
	private static final int MAX_ROWS = 200;

	/* @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object) */
	public Object[] getElements(Object inputElement) {

	    if (inputElement instanceof Iterator<?>) {
            final Iterator<DaaRuleViolation> violationsIterator = (Iterator<DaaRuleViolation>)inputElement;
            final List<DaaRuleViolation> violations = new ArrayList<DaaRuleViolation>();
            for (int count = 0; violationsIterator.hasNext() && count < MAX_ROWS; count++) {
                final DaaRuleViolation violation = violationsIterator.next();
                if (!violationIsInList(violation, violations)) {
                    violations.add(violation);
                }
            }

            return violations.toArray(new DaaRuleViolation[violations.size()]);
        }
        return Util.EMPTY_ARRAY;
	}

	/* @see org.eclipse.jface.viewers.IContentProvider#dispose() */
	public void dispose() {
        // do nothing
	}

    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
        // do nothing
    }

    private static boolean violationIsInList(DaaRuleViolation newViolation, List<DaaRuleViolation> list) {

    	if (list.isEmpty()) return false;
    	
        final Iterator<DaaRuleViolation> violationIterator = list.iterator();
        while (violationIterator.hasNext()) {

            final DaaRuleViolation violation = violationIterator.next();
            if (violation.getVariableName().equals(newViolation.getVariableName())
                    && violation.getType().equals(newViolation.getType())
                    && violation.getBeginLine() == newViolation.getBeginLine()
                    && violation.getEndLine() == newViolation.getEndLine()) {
                return true;
            }
        }
        return false;
    }

}