com.codetaco.cli.variables.VariablePuller Maven / Gradle / Ivy

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package com.codetaco.cli.variables;

import java.lang.reflect.Field;
import java.text.ParseException;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.codetaco.cli.ICmdLine;
import com.codetaco.cli.type.CmdLineCLA;
import com.codetaco.cli.type.ICmdLineArg;

/**
 * 
 * VariablePuller class.
 * 
 *
 * @author Chris DeGreef [email protected]
 */
public class VariablePuller {
    private final static Logger logger = LoggerFactory.getLogger(VariablePuller.class.getName());

    static private VariablePuller instance;

    /**
     * 
     * Getter for the field instance.
     * 
     *
     * @return a {@link com.codetaco.cli.variables.VariablePuller} object.
     */
    public static VariablePuller getInstance() {
        if (instance == null)
            instance = new VariablePuller();
        return instance;
    }

    /**
     * 
     * pull.
     * 
     *
     * @param arg            a {@link com.codetaco.cli.type.ICmdLineArg} object.
     * @param variableSource a {@link java.lang.Object} object.
     * @throws java.text.ParseException           if any.
     * @throws java.lang.IllegalArgumentException if any.
     * @throws java.lang.IllegalAccessException   if any.
     */
    @SuppressWarnings("unchecked")
    public void pull(final ICmdLineArg arg, final Object variableSource)
      throws ParseException, IllegalArgumentException, IllegalAccessException {
        arg.reset();
        if (arg.isSystemGenerated())
            return;

        final String errMsg = "pulling "
          + arg.getVariable()
          + " from "
          + variableSource.getClass().getName();

        final Field field = VariableAssigner.findFieldInAnyParentOrMyself(arg, variableSource.getClass(), errMsg);
        if (field == null)
            return;

        final boolean wasAccessible = field.isAccessible();

        try {
            field.setAccessible(true);

            if (field.getType() == List.class) {
                final List