GemListModel.java

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package org.netbeans.modules.ruby.platform.gems;

import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import javax.swing.AbstractListModel;
import javax.swing.ComboBoxModel;

final class GemListModel extends AbstractListModel implements ComboBoxModel {

    private final List<Gem> gems;
    private List<Gem> filtered;
    private Object selectedGem;

    GemListModel(List<Gem> gems, String filter) {
        this.gems = gems;
        this.filtered = gems;
        applyFilter(filter);
    }

    void applyFilter(final String filter) {
        if (filter == null || filter.length() == 0) {
            filtered = gems;
        } else {
            Pattern pattern = null;
            String lcFilter = null;
            if (filter.indexOf('*') != -1 || filter.indexOf('^') != -1 || filter.indexOf('$') != -1) {
                try {
                    pattern = Pattern.compile(filter, Pattern.CASE_INSENSITIVE);
                } catch (PatternSyntaxException pse) {
                    // Don't treat the filter as a regexp
                }
            } else {
                lcFilter = filter.toLowerCase(Locale.ENGLISH);
            }
            filtered = new ArrayList<Gem>();
            for (Gem gem : gems) {
                if (pattern == null) {
                    if (lcFilter != null) {
                        String lcName = gem.getName().toLowerCase();
                        if (lcName.indexOf(lcFilter) != -1) {
                            filtered.add(gem);
                        } else if (gem.getDescription() != null) {
                            String lcDesc = gem.getDescription().toLowerCase();
                            if (lcDesc.indexOf(lcFilter) != -1) {
                                filtered.add(gem);
                            }
                        }
                    } else {
                        filtered.add(gem);
                    }
                } else if (pattern.matcher(gem.getName()).find() ||
                        (gem.getDescription() != null && pattern.matcher(gem.getDescription()).find())) {
                    filtered.add(gem);
                }
            }
        }
        fireContentsChanged(this, -1, -1);
    }

    public int getAllSize() {
        return gems.size();
    }

    public int getSize() {
        return filtered.size();
    }

    public Object getElementAt(int index) {
        return index >= 0 && index < filtered.size() ? filtered.get(index) : null;
    }

    public void setSelectedItem(Object selectedGem) {
        this.selectedGem = selectedGem;
    }

    public Object getSelectedItem() {
        return selectedGem;
    }

}