/**
 The contents of this file are subject to the Mozilla Public License Version 1.1
 (the "License"); you may not use this file except in compliance with the License.
 You may obtain a copy of the License at http://www.mozilla.org/MPL/
 Software distributed under the License is distributed on an "AS IS" basis,
 WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
 specific language governing rights and limitations under the License.

 The Original Code is "Varies.java".  Description:
 "Varies is a Type used as a placeholder for another Type in cases where
 the appropriate Type is not known until run-time (e.g"

 The Initial Developer of the Original Code is University Health Network. Copyright (C)
 2001.  All Rights Reserved.

 Contributor(s): ______________________________________.

 Alternatively, the contents of this file may be used under the terms of the
 GNU General Public License (the "GPL"), in which case the provisions of the GPL are
 applicable instead of those above.  If you wish to allow use of your version of this
 file only under the terms of the GPL and not to allow others to use your version
 of this file under the MPL, indicate your decision by deleting  the provisions above
 and replace  them with the notice and other provisions required by the GPL License.
 If you do not delete the provisions above, a recipient may use your version of
 this file under either the MPL or the GPL.

 */

package ca.uhn.hl7v2.model;

import ca.uhn.hl7v2.HL7Exception;
import ca.uhn.hl7v2.Location;
import ca.uhn.hl7v2.parser.EncodingCharacters;
import ca.uhn.hl7v2.parser.FixFieldDataType;
import ca.uhn.hl7v2.parser.ModelClassFactory;
import ca.uhn.hl7v2.parser.ParserConfiguration;

/**
 * <p>Varies is a Type used as a placeholder for another Type in cases where
 * the appropriate Type is not known until run-time (e.g. OBX-5).
 * Parsers and validators may have logic that enforces restrictions on the
 * Type based on other features of a segment.</p>
 * <p>If you want to set both the type and the values of a Varies object, you should
 * set the type first by calling setData(Type t), keeping a reference to your Type,
 * and then set values by calling methods on the Type.  Here is an example:</p>
 * <p><code>CN cn = new CN();<br>
 * variesObject.setData(cn);<br>
 * cn.getIDNumber().setValue("foo");</code></p>
 *
 * @author Bryan Tripp (bryan_tripp@users.sourceforge.net)
 * @author Andy Pardue
 */
@SuppressWarnings("serial")
public class Varies implements Variable {

    /**
     * System property key: The value may be set to provide a default
     * datatype ("ST", "NM", etc) for an OBX segment with a missing
     * OBX-2 value.
     *
     * @deprecated use FixOBX5#DEFAULT_OBX2_TYPE_PROP
     */
    public static final String DEFAULT_OBX2_TYPE_PROP = FixFieldDataType.DEFAULT_OBX2_TYPE_PROP;

    /**
     * System property key: The value may be set to provide a default
     * datatype ("ST", "NM", etc) for an OBX segment with an invalid
     * OBX-2 value type. In other words, if OBX-2 has a value of "ZYZYZ",
     * which is not a valid value, but this property is set to "ST", then
     * OBX-5 will be parsed as an ST.
     *
     * @deprecated use FixOBX5#INVALID_OBX2_TYPE_PROP
     */
    public static final String INVALID_OBX2_TYPE_PROP = FixFieldDataType.INVALID_OBX2_TYPE_PROP;

    /**
     * <p>
     * System property key: If this is not set, or set to "true", and a subcomponent delimiter is found within the
     * value of a Varies of a primitive type, this subcomponent delimiter will be treated as a literal
     * character instead of a subcomponent delimiter, and will therefore be escaped if the message is
     * re-encoded. This is handy when dealing with non-conformant sending systems which do not correctly
     * escape ampersands in OBX-5 values.
     * </p>
     * <p>
     * For example, consider the following OBX-5 segment:
     * <pre>
     *    OBX||ST|||Apples, Pears &amp; Bananas|||
     * </pre>
     * In this example, the data type is a primitive ST and does not support subcomponents, and the
     * ampersand is obviously not intended to represent a subcomponent delimiter. If this
     * property is set to <code>true</code>, the entire string will be treated as the
     * value of OBX-5, and if the message is re-encoded the string will appear
     * as "Apples, Pears \T\ Bananas".
     * </p>
     * <p>
     * If this property is set to anything other than "true", the subcomponent delimiter is treated as a component delimiter,
     * so the value after the ampersand is placed into an {@link ExtraComponents extra component}.
     * </p>
     *
     * @deprecated use FixOBX5#ESCAPE_SUBCOMPONENT_DELIM_IN_PRIMITIVE
     */
    public static final String ESCAPE_SUBCOMPONENT_DELIM_IN_PRIMITIVE = FixFieldDataType.ESCAPE_SUBCOMPONENT_DELIM_IN_PRIMITIVE;


    private Type data;
    private Message message;

    /**
     * Creates new Varies.
     *
     * @param message message to which this type belongs
     */
    public Varies(Message message) {
        data = new GenericPrimitive(message);
        this.message = message;
    }

    /**
     * Returns the data contained by this instance of Varies.  Returns a GenericPrimitive unless
     * setData() has been called.
     *
     * @return the data contained by this instance of Varies
     */
    public Type getData() {
        return this.data;
    }

    public String getName() {
        String name = "*";
        if (this.data != null) {
            name = this.data.getName();
        }
        return name;
    }

    /**
     * Sets the data contained by this instance of Varies.  If a data object already exists,
     * then its values are copied to the incoming data object before the old one is replaced.
     * For example, if getData() returns an ST with the value "19901012" and you call
     * setData(new DT()), then subsequent calls to getData() will return the same DT, with the value
     * set to "19901012".
     *
     * @param data the data to be set for this Varies instance
     * @throws DataTypeException if the data could not be set
     */
    public void setData(Type data) throws DataTypeException {
        if (this.data != null) {
            if (!(this.data instanceof Primitive) || ((Primitive) this.data).getValue() != null) {
                ca.uhn.hl7v2.util.DeepCopy.copy(this.data, data);
            }
        }
        this.data = data;
    }

    public ExtraComponents getExtraComponents() {
        return this.data.getExtraComponents();
    }

    /**
     * @return the message to which this Type belongs
     */
    public Message getMessage() {
        return message;
    }

    /**
     * <p>
     * Sets the data type of field 5 in the given OBX segment to the value of OBX-2.  The argument
     * is a Segment as opposed to a particular OBX because it is meant to work with any version.
     * </p>
     * <p>
     * Note that if no value is present in OBX-2, or an invalid value is present in
     * OBX-2, this method will throw an error. This behaviour can be corrected by using the
     * following system properties: {@link #DEFAULT_OBX2_TYPE_PROP} and {@link #INVALID_OBX2_TYPE_PROP},
     * or by using configuration in {@link ParserConfiguration}
     * </p>
     *
     * @param segment OBX segment instance to be modified
     * @param factory ModelClassFactory to be used
     * @throws HL7Exception if the operation fails
     * @deprecated use FixOBX5#fixOBX5
     */
    public static void fixOBX5(Segment segment, ModelClassFactory factory) throws HL7Exception {
        FixFieldDataType.fixOBX5(segment, factory, segment.getMessage().getParser().getParserConfiguration());
    }

    /**
     * <p>
     * Sets the data type of field 5 in the given OBX segment to the value of OBX-2.  The argument
     * is a Segment as opposed to a particular OBX because it is meant to work with any version.
     * </p>
     * <p>
     * Note that if no value is present in OBX-2, or an invalid value is present in
     * OBX-2, this method will throw an error. This behaviour can be corrected by using the
     * following system properties: {@link #DEFAULT_OBX2_TYPE_PROP} and {@link #INVALID_OBX2_TYPE_PROP}
     * or by using configuration in {@link ParserConfiguration}
     * </p>
     *
     * @param segment             OBX segment instance to be modified
     * @param factory             ModelClassFactory to be used
     * @param parserConfiguration configuration that influences setting OBX-5
     * @throws HL7Exception if the operation fails
     * @deprecated use FixOBX5#fixOBX5
     */
    public static void fixOBX5(Segment segment, ModelClassFactory factory, ParserConfiguration parserConfiguration)
            throws HL7Exception {
        FixFieldDataType.fixOBX5(segment, factory, parserConfiguration);
    }


    /**
     * {@inheritDoc }
     */
    public void parse(String string) throws HL7Exception {
        if (data != null) {
            data.clear();
        }
        getMessage().getParser().parse(this, string, EncodingCharacters.getInstance(getMessage()));
    }

    /**
     * {@inheritDoc }
     */
    public String encode() throws HL7Exception {
        return getMessage().getParser().doEncode(this, EncodingCharacters.getInstance(getMessage()));
    }

    /**
     * {@inheritDoc }
     */
    public void clear() {
        data.clear();
    }

    /**
     * {@inheritDoc }
     */
    public boolean isEmpty() throws HL7Exception {
        return data.isEmpty();
    }

    /**
     * {@inheritDoc }
     */
    public String toString() {
        return AbstractType.toString(this);
    }

    public boolean accept(MessageVisitor visitor, Location currentLocation) throws HL7Exception {
        return data.accept(visitor, currentLocation);
    }

    public Location provideLocation(Location location, int index, int repetition) {
        return data.provideLocation(location, index, repetition);
    }

}