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package com.x5.util;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Hashtable;

public class DataCapsuleReader
{
    // For efficiency, keep around instances of DataCapsuleReader objects
    // in a static hashtable so we don't have to wait for slow reflection
    // after the first time...
    private static Hashtable readerCache
        = new Hashtable();

    private String[] labels;
    private String[] bareLabels;
    private String[] methodNames;
    private Method[] methods;

    @SuppressWarnings("rawtypes")
    private Class capsuleClass;

    public static DataCapsuleReader getReader(DataCapsule[] dataCapsules)
    {
        DataCapsuleReader reader = getReaderFromCache(dataCapsules);
        if (reader == null) {
            reader = new DataCapsuleReader(dataCapsules);
            readerCache.put(reader.getDataClassName(), reader);
        }
        return reader;
    }

    public static DataCapsuleReader getReader(DataCapsule dataCapsule)
    {
        if (dataCapsule == null) return null;

        DataCapsuleReader reader = getReaderFromCache(dataCapsule);
        if (reader == null) {
            reader = new DataCapsuleReader(new DataCapsule[]{dataCapsule});
            readerCache.put(reader.getDataClassName(), reader);
        }
        return reader;
    }

    private static DataCapsuleReader getReaderFromCache(DataCapsule[] dataCapsules)
    {
        for (int i=0; i -1) {
            // use specified name
            exportName = directive.substring(spacePos+1).trim();
            methodName = directive.substring(0,spacePos);
        } else {
            // transmogrify method name
            methodName = directive;
            exportName = transmogrify(directive);
        }

        String prefixedName = exportName;
        if (exportPrefix != null) {
            prefixedName = exportPrefix + "_" + exportName;
        }

        labels[i] = prefixedName;
        bareLabels[i] = exportName;
        methodNames[i] = methodName;
    }

    // transmogrify converts getDatePretty to date_pretty
    private static String transmogrify(String s)
    {
        String spaced = ObjectDataMap.splitCamelCase(s);
        if (spaced.startsWith("get_")) {
            return spaced.substring(4);
        } else {
            return spaced;
        }
    }

    public String[] getColumnLabels(String altPrefix)
    {
        if (altPrefix == null) return getColumnLabels();

        String[] altLabels = new String[bareLabels.length];
        for (int i=0; i=0 && matchCount > 0; i--) {
            if (isMatch[i]) {
                matchCount--;
                simpleMethods[matchCount] = allMethods[i];
            }
        }

        return simpleMethods;
    }
}