src/antidote/org/apache/tools/ant/gui/wizard/DefaultStateMachine.java

/*
 * The Apache Software License, Version 1.1
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 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
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 * ====================================================================
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 */
package org.apache.tools.ant.gui.wizard;
import org.apache.tools.ant.gui.core.ResourceManager;
import java.util.*;

/**
 * A simple state machine based on the defined ordering of steps
 * in the resources.
 * 
 * @version $Revision$ 
 * @author Simeon Fitch 
 */
public class DefaultStateMachine implements StateMachine {

    /** 
     * Get the list of step IDs defined in the resources as a list.
     * 
     * @param data Current wizard state.
     * @return List of step IDs
     */
    protected List getStepList(WizardData data) {
        return Arrays.asList(data.getResources().getStringArray("steps"));
    }

    /** 
     * Get the next step.
     * 
     * @param curr The current step.
     * @param data The current state of the wizard.
     * @return The ID of next step, or null if there currently isn't one.
     */
    public String getNext(WizardStep curr, WizardData data) {
        List steps = getStepList(data);
        int nextIndex = steps.indexOf(curr.getID()) + 1;
        if(nextIndex > 0 && nextIndex < steps.size()) {
            return (String) steps.get(nextIndex);
        }
        return null;
    }

    /** 
     * Get the previous step.
     * 
     * @param curr The current step.
     * @param data The current state of the wizard.
     * @return The ID of previous step, or null if there currently isn't one.
     */
    public String getPrevious(WizardStep curr, WizardData data) {
        List steps = getStepList(data);
        int nextIndex = steps.indexOf(curr.getID()) - 1;
        if(nextIndex > 0 && nextIndex < steps.size()) {
            return (String) steps.get(nextIndex);
        }
        return null;
    }
}