MetaDataImpl.java

package org.csstudio.dal.simple.impl;

import org.csstudio.dal.AccessType;
import org.csstudio.dal.simple.MetaData;

/**
 * 
 * <code>MetaDataImpl</code> is a default implementation of the {@link MetaData}
 * interface, which receives all data through a constructor and returns it 
 * through the interface methods. 
 *
 * @author <a href="mailto:jaka.bobnar@cosylab.com">Jaka Bobnar</a>
 *
 */
public class MetaDataImpl implements MetaData {

	private final String name;
	private final String description;
	private final double displayLow;
	private final double displayHigh;
	private final double warningLow;
	private final double warningHigh;
	private final double alarmLow;
	private final double alarmHigh; 
	private final String[] enumDescriptions;
	private final Object[] enumValues;
	private final String format;
	private final String units;
	private final int precision;
	private final String dataType;
	private final AccessType accessType;
	private final String hostname;
	private final int sequenceLength;
	
	protected MetaDataImpl(String name, String description, Number displayLow, Number displayHigh, 
			Number warningLow, Number warningHigh, Number alarmLow, Number alarmHigh, 
			String[] enumDescriptions, Object[] enumValues,	String format, String units,
			Integer sequenceLength, Integer precision, String dataType, 
			AccessType accessType, String hostname) {
		this.name = name;
		this.description = description;
		this.displayLow = displayLow != null ? displayLow.doubleValue() : Double.NaN;
		this.displayHigh = displayHigh != null ? displayHigh.doubleValue() : Double.NaN;
		this.warningLow = warningLow != null ? warningLow.doubleValue() : Double.NaN;
		this.warningHigh = warningHigh != null ? warningHigh.doubleValue() : Double.NaN;
		this.alarmLow = alarmLow != null ? alarmLow.doubleValue() : Double.NaN;
		this.alarmHigh = alarmHigh != null ? alarmHigh.doubleValue() : Double.NaN;
		this.enumDescriptions = enumDescriptions;
		this.enumValues = enumValues;
		this.format = format;
		this.units = units;
		this.precision = precision != null ? precision : 0;
		this.dataType = dataType;
		this.accessType = accessType != null ? accessType : AccessType.NONE;
		this.hostname = hostname;
		this.sequenceLength = sequenceLength != null ? sequenceLength : 1;
	}
	
	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getAccessType()
	 */
	@Override
	public AccessType getAccessType() {
		return accessType;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getAlarmHigh()
	 */
	@Override
	public double getAlarmHigh() {
		return alarmHigh;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getAlarmLow()
	 */
	@Override
	public double getAlarmLow() {
		return alarmLow;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getDataType()
	 */
	@Override
	public String getDataType() {
		return dataType;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getDescription()
	 */
	@Override
	public String getDescription() {
		return description;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getDisplayHigh()
	 */
	@Override
	public double getDisplayHigh() {
		return displayHigh;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getDisplayLow()
	 */
	@Override
	public double getDisplayLow() {
		return displayLow;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getState(int)
	 */
	@Override
	public String getState(int index) {
		if (enumDescriptions == null) return null;
		return enumDescriptions[index];
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getStates()
	 */
	@Override
	public String[] getStates() {
		if (enumDescriptions == null) return null;
		String[] s = new String[enumDescriptions.length];
		System.arraycopy(enumDescriptions, 0, s, 0, s.length);
		return s;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getStateValue(int)
	 */
	@Override
	public Object getStateValue(int index) {
		if (enumValues == null) return null;
		return enumValues[index];
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getStateValues()
	 */
	@Override
	public Object[] getStateValues() {
		if (enumValues == null) return null;
		String[] s = new String[enumValues.length];
		System.arraycopy(enumValues, 0, s, 0, s.length);
		return s;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getFormat()
	 */
	@Override
	public String getFormat() {
		return format;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getHostname()
	 */
	@Override
	public String getHostname() {
		return hostname;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getName()
	 */
	@Override
	public String getName() {
		return name;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getPrecision()
	 */
	@Override
	public int getPrecision() {
		return precision;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getUnits()
	 */
	@Override
	public String getUnits() {
		return units;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getWarnHigh()
	 */
	@Override
	public double getWarnHigh() {
		return warningHigh;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getWarnLow()
	 */
	@Override
	public double getWarnLow() {
		return warningLow;
	}

	/*
	 * (non-Javadoc)
	 * @see org.csstudio.dal.simple.MetaData#getSequenceLength()
	 */
	@Override
	public int getSequenceLength() {
		return sequenceLength;
	}
	
	public static MetaData createUninitializedMetaData() {
		return new MetaDataImpl(null, null, null, null, null, null, null, null, 
				null, null,	null, null, null, null, null, null, null);
	}
}