kxmlparser.java

KXML一个基于j2me的xml解析器

        srcPos = 0;
        srcCount = 0;
        peekCount = 0;
        depth = 0;

        entityMap = new Hashtable();
        entityMap.put("amp", "&");
        entityMap.put("apos", "'");
        entityMap.put("gt", ">");
        entityMap.put("lt", "<");
        entityMap.put("quot", "\"");
    }

    public void setInput(InputStream is, String _enc)
        throws XmlPullParserException {

        srcPos = 0;
        srcCount = 0;
        String enc = _enc;

        if (is == null)
            throw new IllegalArgumentException();

        try {

            if (enc == null) {
                // read four bytes 

                int chk = 0;

                while (srcCount < 4) {
                    int i = is.read();
                    if (i == -1)
                        break;
                    chk = (chk << 8) | i;
                    srcBuf[srcCount++] = (char) i;
                }

                if (srcCount == 4) {
                    switch (chk) {
                        case 0x00000FEFF :
                            enc = "UTF-32BE";
                            srcCount = 0;
                            break;

                        case 0x0FFFE0000 :
                            enc = "UTF-32LE";
                            srcCount = 0;
                            break;

                        case 0x03c :
                            enc = "UTF-32BE";
                            srcBuf[0] = '<';
                            srcCount = 1;
                            break;

                        case 0x03c000000 :
                            enc = "UTF-32LE";
                            srcBuf[0] = '<';
                            srcCount = 1;
                            break;

                        case 0x0003c003f :
                            enc = "UTF-16BE";
                            srcBuf[0] = '<';
                            srcBuf[1] = '?';
                            srcCount = 2;
                            break;

                        case 0x03c003f00 :
                            enc = "UTF-16LE";
                            srcBuf[0] = '<';
                            srcBuf[1] = '?';
                            srcCount = 2;
                            break;

                        case 0x03c3f786d :
                            while (true) {
                                int i = is.read();
                                if (i == -1)
                                    break;
                                srcBuf[srcCount++] = (char) i;
                                if (i == '>') {
                                    String s = new String(srcBuf, 0, srcCount);
                                    int i0 = s.indexOf("encoding");
                                    if (i0 != -1) {
                                        while (s.charAt(i0) != '"'
                                            && s.charAt(i0) != '\'')
                                            i0++;
                                        char deli = s.charAt(i0++);
                                        int i1 = s.indexOf(deli, i0);
                                        enc = s.substring(i0, i1);
                                    }
                                    break;
                                }
                            }

                        default :
                            if ((chk & 0x0ffff0000) == 0x0FEFF0000) {
                                enc = "UTF-16BE";
                                srcBuf[0] =
                                    (char) ((srcBuf[2] << 8) | srcBuf[3]);
                                srcCount = 1;
                            }
                            else if ((chk & 0x0ffff0000) == 0x0fffe0000) {
                                enc = "UTF-16LE";
                                srcBuf[0] =
                                    (char) ((srcBuf[3] << 8) | srcBuf[2]);
                                srcCount = 1;
                            }
                            else if ((chk & 0x0ffffff00) == 0x0EFBBBF00) {
                                enc = "UTF-8";
                                srcBuf[0] = srcBuf[3];
                                srcCount = 1;
                            }
                    }
                }
            }

            if (enc == null)
                enc = "UTF-8";

            int sc = srcCount;
            setInput(new InputStreamReader(is, enc));
            encoding = _enc;
            srcCount = sc;
        }
        catch (Exception e) {
            throw new XmlPullParserException(
                "Invalid stream or encoding: " + e.toString(),
                this,
                e);
        }
    }

    public boolean getFeature(String feature) {
        if (XmlPullParser.FEATURE_PROCESS_NAMESPACES.equals(feature))
            return processNsp;
        else if (isProp(feature, false, "relaxed"))
            return relaxed;
        else
            return false;
    }

    public String getInputEncoding() {
        return encoding;
    }

    public void defineEntityReplacementText(String entity, String value)
        throws XmlPullParserException {
        if (entityMap == null)
            throw new RuntimeException("entity replacement text must be defined after setInput!");
        entityMap.put(entity, value);
    }

    public Object getProperty(String property) {
        if (isProp(property, true, "xmldecl-version"))
            return version;
        if (isProp(property, true, "xmldecl-standalone"))
            return standalone;
		if (isProp(property, true, "location"))            
			return location != null ? location : reader.toString();
        return null;
    }

    public int getNamespaceCount(int depth) {
        if (depth > this.depth)
            throw new IndexOutOfBoundsException();
        return nspCounts[depth];
    }

    public String getNamespacePrefix(int pos) {
        return nspStack[pos << 1];
    }

    public String getNamespaceUri(int pos) {
        return nspStack[(pos << 1) + 1];
    }

    public String getNamespace(String prefix) {

        if ("xml".equals(prefix))
            return "http://www.w3.org/XML/1998/namespace";
        if ("xmlns".equals(prefix))
            return "http://www.w3.org/2000/xmlns/";

        for (int i = (getNamespaceCount(depth) << 1) - 2; i >= 0; i -= 2) {
            if (prefix == null) {
                if (nspStack[i] == null)
                    return nspStack[i + 1];
            }
            else if (prefix.equals(nspStack[i]))
                return nspStack[i + 1];
        }
        return null;
    }

    public int getDepth() {
        return depth;
    }

    public String getPositionDescription() {

        StringBuffer buf =
            new StringBuffer(type < TYPES.length ? TYPES[type] : "unknown");
        buf.append(' ');

        if (type == START_TAG || type == END_TAG) {
            if (degenerated)
                buf.append("(empty) ");
            buf.append('<');
            if (type == END_TAG)
                buf.append('/');

            if (prefix != null)
                buf.append("{" + namespace + "}" + prefix + ":");
            buf.append(name);

            int cnt = attributeCount << 2;
            for (int i = 0; i < cnt; i += 4) {
                buf.append(' ');
                if (attributes[i + 1] != null)
                    buf.append(
                        "{" + attributes[i] + "}" + attributes[i + 1] + ":");
                buf.append(attributes[i + 2] + "='" + attributes[i + 3] + "'");
            }

            buf.append('>');
        }
        else if (type == IGNORABLE_WHITESPACE);
        else if (type != TEXT)
            buf.append(getText());
        else if (isWhitespace)
            buf.append("(whitespace)");
        else {
            String text = getText();
            if (text.length() > 16)
                text = text.substring(0, 16) + "...";
            buf.append(text);
        }

		buf.append("@"+line + ":" + column);
		if(location != null){
			buf.append(" in ");
			buf.append(location);
		}
		else if(reader != null){
			buf.append(" in ");
			buf.append(reader.toString());
		}
        return buf.toString();
    }

    public int getLineNumber() {
        return line;
    }

    public int getColumnNumber() {
        return column;
    }

    public boolean isWhitespace() throws XmlPullParserException {
        if (type != TEXT && type != IGNORABLE_WHITESPACE && type != CDSECT)
            exception(ILLEGAL_TYPE);
        return isWhitespace;
    }

    public String getText() {
        return type < TEXT
            || (type == ENTITY_REF && unresolved) ? null : get(0);
    }

    public char[] getTextCharacters(int[] poslen) {
        if (type >= TEXT) {
            if (type == ENTITY_REF) {
                poslen[0] = 0;
                poslen[1] = name.length();
                return name.toCharArray();
            }
            poslen[0] = 0;
            poslen[1] = txtPos;
            return txtBuf;
        }

        poslen[0] = -1;
        poslen[1] = -1;
        return null;
    }

    public String getNamespace() {
        return namespace;
    }

    public String getName() {
        return name;
    }

    public String getPrefix() {
        return prefix;
    }

    public boolean isEmptyElementTag() throws XmlPullParserException {
        if (type != START_TAG)
            exception(ILLEGAL_TYPE);
        return degenerated;
    }

    public int getAttributeCount() {
        return attributeCount;
    }

    public String getAttributeType(int index) {
        return "CDATA";
    }

    public boolean isAttributeDefault(int index) {
        return false;
    }

    public String getAttributeNamespace(int index) {
        if (index >= attributeCount)
            throw new IndexOutOfBoundsException();
        return attributes[index << 2];
    }

    public String getAttributeName(int index) {
        if (index >= attributeCount)
            throw new IndexOutOfBoundsException();
        return attributes[(index << 2) + 2];
    }

    public String getAttributePrefix(int index) {
        if (index >= attributeCount)
            throw new IndexOutOfBoundsException();
        return attributes[(index << 2) + 1];
    }

    public String getAttributeValue(int index) {
        if (index >= attributeCount)
            throw new IndexOutOfBoundsException();
        return attributes[(index << 2) + 3];
    }

    public String getAttributeValue(String namespace, String name) {

        for (int i = (attributeCount << 2) - 4; i >= 0; i -= 4) {
            if (attributes[i + 2].equals(name)
                && (namespace == null || attributes[i].equals(namespace)))
                return attributes[i + 3];
        }

        return null;
    }

    public int getEventType() throws XmlPullParserException {
        return type;
    }

    public int next() throws XmlPullParserException, IOException {

        txtPos = 0;
        isWhitespace = true;
        int minType = 9999;
        token = false;

        do {
            nextImpl();
            if (type < minType)
                minType = type;
            //	    if (curr <= TEXT) type = curr; 
        }
        while (minType > ENTITY_REF // ignorable
            || (minType >= TEXT && peekType() >= TEXT));

        type = minType;
        if (type > TEXT)
            type = TEXT;

        return type;
    }

    public int nextToken() throws XmlPullParserException, IOException {

        isWhitespace = true;
        txtPos = 0;

        token = true;
        nextImpl();
        return type;
    }

    //
    // utility methods to make XML parsing easier ...

    public int nextTag() throws XmlPullParserException, IOException {

        next();
        if (type == TEXT && isWhitespace)
            next();

        if (type != END_TAG && type != START_TAG)
            exception("unexpected type");

        return type;
    }

    public void require(int type, String namespace, String name)
        throws XmlPullParserException, IOException {

        if (type != this.type
            || (namespace != null && !namespace.equals(getNamespace()))
            || (name != null && !name.equals(getName())))
            exception(
                "expected: " + TYPES[type] + " {" + namespace + "}" + name);
    }

    public String nextText() throws XmlPullParserException, IOException {
        if (type != START_TAG)
            exception("precondition: START_TAG");

        next();

        String result;

        if (type == TEXT) {
            result = getText();
            next();
        }
        else
            result = "";

        if (type != END_TAG)
            exception("END_TAG expected");

        return result;
    }

    public void setFeature(String feature, boolean value)
        throws XmlPullParserException {
        if (XmlPullParser.FEATURE_PROCESS_NAMESPACES.equals(feature))
            processNsp = value;
        else if (isProp(feature, false, "relaxed"))
            relaxed = value;
        else
            exception("unsupported feature: " + feature);
    }

    public void setProperty(String property, Object value)
        throws XmlPullParserException {
        if(isProp(property, true, "location"))
        	location = value;
        else
	        throw new XmlPullParserException("unsupported property: " + property);
    }

    /**
      * Skip sub tree that is currently porser positioned on.
      * <br>NOTE: parser must be on START_TAG and when funtion returns
      * parser will be positioned on corresponding END_TAG. 
      */

    //	Implementation copied from Alek's mail... 

    public void skipSubTree() throws XmlPullParserException, IOException {
        require(START_TAG, null, null);
        int level = 1;
        while (level > 0) {
            int eventType = next();
            if (eventType == END_TAG) {
                --level;
            }
            else if (eventType == START_TAG) {
                ++level;
            }
        }
    }
}