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AbstractComponent.java

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 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
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package net.java.games.input;

import java.io.IOException;

/**
 * Skeleton implementation of a named axis.
 */
00046 public abstract class AbstractComponent implements Component {

    /**
     * Human-readable name for this Axis
     */
00051     private final String name;
    
    private final Identifier id;

      private boolean has_polled;
      private float value;
      private float event_value;
    
    /**
     * Protected constructor
     * @param name A name for the axis
     */
00063     protected AbstractComponent(String name, Identifier id) {
        this.name = name;
        this.id = id;
    }
        
    /**
     * Returns the type or identifier of the axis.
     */
00071     public Identifier getIdentifier() {
        return id;
    }
    
    /**
     * Returns whether or not the axis is analog, or false if it is digital.
     * @return false by default, can be overridden
     */
00079     public boolean isAnalog() {
        return false;
    }

    /**
     * Returns the suggested dead zone for this axis.  Dead zone is the
     * amount polled data can vary before considered a significant change
     * in value.  An application can safely ignore changes less than this
     * value in the positive or negative direction.
     * @return 0.0f by default, can be overridden
     */
00090     public float getDeadZone() {
        return 0.0f;
    }

    /**
     * Returns the data from the last time the control has been polled.
     * If this axis is a button, the value returned will be either 0.0f or 1.0f.
     * If this axis is normalised, the value returned will be between -1.0f and
     * 1.0f.
     * @return The data from the last time the control has been polled.
     */
00101     public final float getPollData() {
            if (!has_polled && !isRelative()) {
                  has_polled = true;
                  try {
                        setPollData(poll());
                  } catch (IOException e) {
                        ControllerEnvironment.log("Failed to poll component: " + e);
                  }
            }
        return value;
    }

      final void resetHasPolled() {
            has_polled = false;
      }

    final void setPollData(float value) {
        this.value = value;
    }
 
    final float getEventValue() {
        return event_value;
    }

    final void setEventValue(float event_value) {
        this.event_value = event_value;
    }
 
    /**
     * Returns a human-readable name for this axis.
     */
00132     public String getName() {
        return name;
    }
    
    /**
     * Returns a non-localized string description of this axis.
     */
00139     public String toString() {
        return name;
    }

      protected abstract float poll() throws IOException;
    
} // AbstractAxis

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