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Tango client utilities

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/*
 * Created on 18 Jan 2007
 * with Eclipse
 */
package org.tango.script.evalution;

import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;

import fr.esrf.Tango.DevFailed;
import fr.esrf.TangoDs.TangoConst;
import fr.soleil.tango.clientapi.TangoAttribute;

/**
 * Implementation of IContextVariable which gets its value from AttributeProxy.
 *
 * @author HARDION
 */
public final class AttributeProxyVariable implements IContextVariable {

    private final String name;

    private final String attributeName;

    private TangoAttribute proxy = null;

    /**
     * Build a variable with an AttributeProxy
     *
     * @param name
     *            name of the variable
     * @param attributeName
     *            name of the attribute proxy
     */
    public AttributeProxyVariable(final String name, final String attributeName) {
        super();
        this.name = name;
        this.attributeName = attributeName;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public Object getValue() throws DevFailed {
        if (proxy == null) {
            proxy = new TangoAttribute(attributeName);
        }
        // read SCALAR value from device
        final Object result;
        if (proxy.getDataType() == TangoConst.Tango_DEV_STATE) {
            // convert tango state to string
            result = proxy.read(String.class);
        } else {
            result = proxy.read();
        }

        return result;
    }

    /**
     * @return the attributeName
     */
    public String getAttributeName() {
        return attributeName;
    }

    @Override
    public String toString() {
        final ToStringBuilder sb = new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE);
        sb.append("name", name);
        sb.append("attributeName", attributeName);
        return sb.toString();
    }
}