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package org.netbeans.lib.profiler.common.filters;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;


/**
 * This class encapsulates globally defined filters (name-value pairs) and the functionality around
 *
 * @author Tomas Hurka
 * @author  Jiri Sedlacek
 */
public final class GlobalFilters {
    //~ Instance fields ----------------------------------------------------------------------------------------------------------

    private String[] filterNames;
    private String[] filterValues;

    //~ Constructors -------------------------------------------------------------------------------------------------------------

    /** Creates a new instance of GlobalFilters */
    public GlobalFilters() {
        clear();
    }

    //~ Methods ------------------------------------------------------------------------------------------------------------------

    public int getFilterIndex(final String filterName) {
        for (int i = 0; i < filterNames.length; i++) {
            if (filterNames[i].equals(filterName)) {
                return i;
            }
        }

        return -1;
    }

    public void setFilterNames(final String[] names) {
        if (names == null) {
            return;
        }

        filterNames = names;
    }

    public String[] getFilterNames() {
        return filterNames;
    }

    public String getFilterValue(final String filterName) {
        final int filterIndex = getFilterIndex(filterName);

        if (filterIndex == -1) {
            return null;
        }

        return filterValues[filterIndex];
    }

    public void setFilterValues(final String[] values) {
        if (values == null) {
            return;
        }

        filterValues = values;
    }

    public String[] getFilterValues() {
        return filterValues;
    }

    public void clear() {
        initBuffers(0);
    }

    public void load(final Map props) {
        final List filterNamesVect = new ArrayList();
        final List filterValuesVect = new ArrayList();

        String filterName;

        while ((filterName = (String) props.get("Filter-" + filterNamesVect.size() + "-name")) != null) { //NOI18N
            filterNamesVect.add(filterName);
            filterValuesVect.add(getProperty(props, "Filter-" + filterValuesVect.size() + "-value", "")); //NOI18N
        }

        filterNames = new String[filterNamesVect.size()];
        filterValues = new String[filterValuesVect.size()];

        for (int i = 0; i < filterNamesVect.size(); i++) {
            filterNames[i] = (String) filterNamesVect.get(i);
            filterValues[i] = (String) filterValuesVect.get(i);
        }
    }

    public void store(final Map props) {
        String itemPrefix;

        for (int i = 0; i < filterNames.length; i++) {
            itemPrefix = "Filter-" + i + "-"; //NOI18N
            props.put(itemPrefix + "name", filterNames[i]); //NOI18N
            props.put(itemPrefix + "value", filterValues[i]); //NOI18N
        }
    }

    private static String getProperty(final Map props, final Object key, final String defaultValue) {
        final Object ret = props.get(key);

        return (ret != null) ? (String) ret : defaultValue;
    }

    private void initBuffers(final int capacity) {
        filterNames = new String[capacity];
        filterValues = new String[capacity];
    }
}
