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package com.ctc.wstx.evt;

import java.io.IOException;
import java.io.Writer;

import javax.xml.namespace.QName;
import javax.xml.stream.Location;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.stream.events.Attribute;

import com.ctc.wstx.io.TextEscaper;

public class WAttribute
    extends WEvent
    implements Attribute
{
    final QName mName;
    final String mValue;
    final boolean mWasSpecified;

    public WAttribute(Location loc, String localName, String uri, String prefix,
                      String value, boolean wasSpec)
    {
        super(loc);
        mValue = value;
        if (prefix == null) {
            if (uri == null) {
                mName = new QName(localName);
            } else {
                mName = new QName(uri, localName);
            }
        } else {
            if (uri == null) {
                uri = ""; // only because QName will barf otherwise...
            }
            mName = new QName(uri, localName, prefix);
        }
        mWasSpecified = wasSpec;
    }

    public WAttribute(Location loc, QName name, String value, boolean wasSpec)
    {
        super(loc);
        mName = name;
        mValue = value;
        mWasSpecified = wasSpec;
    }

    /*
    ///////////////////////////////////////////
    // Implementation of abstract base methods
    ///////////////////////////////////////////
     */

    public int getEventType() {
        return ATTRIBUTE;
    }

    public boolean isAttribute() { return true; }

    public void writeAsEncodedUnicode(Writer w)
        throws XMLStreamException
    {
        /* Specs don't really specify exactly what to output... but
         * let's do a reasonable guess:
         */
        String prefix = mName.getPrefix();
        try {
            if (prefix != null && prefix.length() > 0) {
                w.write(prefix);
                w.write(':');
            }
            w.write(mName.getLocalPart());
            w.write('=');
            w.write('"');
            TextEscaper.writeEscapedAttrValue(w, mValue);
            w.write('"');
        } catch (IOException ie) {
            throwFromIOE(ie);
        }
    }

    public void writeUsing(XMLStreamWriter w) throws XMLStreamException
    {
        QName n = mName;
        w.writeAttribute(n.getPrefix(), n.getLocalPart(),
                         n.getNamespaceURI(), mValue);
    }

    /*
    ///////////////////////////////////////////
    // Attribute implementation
    ///////////////////////////////////////////
     */

    public String getDTDType() {
        /* !!! TBI: 07-Sep-2004, TSa: Need to figure out an efficient way
         *    to pass this info...
         */
        return "CDATA";
    }

    public QName getName()
    {
        return mName;
    }

    public String getValue()
    {
        return mValue;
    }

    public boolean isSpecified()
    {
        return mWasSpecified;
    }

    /*
    ///////////////////////////////////////////
    // Overridden standard methods
    ///////////////////////////////////////////
     */
}