137 lines
2.6 KiB
Java
137 lines
2.6 KiB
Java
package micropolisj;
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import java.io.*;
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import javax.xml.stream.*;
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public class XML_Helper
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{
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private XML_Helper() {}
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public static void skipToEndElement(XMLStreamReader in)
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throws XMLStreamException
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{
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if (!in.isStartElement()) {
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return;
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}
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int tagDepth = 1;
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while (tagDepth > 0 && in.hasNext()) {
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in.next();
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if (in.isStartElement()) {
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tagDepth++;
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}
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else if (in.isEndElement()) {
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tagDepth--;
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}
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}
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}
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public static Reader readElementText(XMLStreamReader in)
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{
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return new ElementTextReader(in);
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}
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static class ElementTextReader extends Reader
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{
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XMLStreamReader xsr;
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int tagDepth;
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char [] buf;
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int buf_start;
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int buf_end;
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ElementTextReader(XMLStreamReader xsr)
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{
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this.xsr = xsr;
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this.tagDepth = 1;
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}
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private void readMore()
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throws XMLStreamException
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{
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while (tagDepth > 0 && buf_start == buf_end) {
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int nodeType = xsr.next();
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if (nodeType == XMLStreamConstants.START_ELEMENT) {
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tagDepth++;
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}
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else if (nodeType == XMLStreamConstants.END_ELEMENT) {
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tagDepth--;
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}
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else if (nodeType == XMLStreamConstants.CDATA ||
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nodeType == XMLStreamConstants.CHARACTERS ||
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nodeType == XMLStreamConstants.ENTITY_REFERENCE ||
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nodeType == XMLStreamConstants.SPACE)
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{
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buf = xsr.getTextCharacters();
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buf_start = xsr.getTextStart();
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buf_end = buf_start + xsr.getTextLength();
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}
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}
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}
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@Override
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public int read(char[] cbuf, int off, int len)
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throws IOException
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{
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if (buf_start == buf_end) {
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try {
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readMore();
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}
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catch (XMLStreamException e) {
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throw new IOException("XML stream error: "+ e, e);
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}
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if (tagDepth == 0) {
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// reached closing tag
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return -1;
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}
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}
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if (buf_start + len <= buf_end) {
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// already have the text loaded
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System.arraycopy(buf, buf_start, cbuf, off, len);
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buf_start += len;
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return len;
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}
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else {
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// not enough text available for entire request,
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// so just return what we have until the next
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// request
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len = buf_end - buf_start;
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assert len > 0;
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System.arraycopy(buf, buf_start, cbuf, off, len);
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buf_start += len;
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assert buf_start == buf_end;
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return len;
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}
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}
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@Override
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public void close()
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throws IOException
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{
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buf_start = 0;
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buf_end = 0;
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try {
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while (tagDepth > 0 && xsr.hasNext()) {
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xsr.next();
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if (xsr.isStartElement()) {
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tagDepth++;
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}
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else if (xsr.isEndElement()) {
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tagDepth--;
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}
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}
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}
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catch (XMLStreamException e) {
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throw new IOException("XML stream error: "+e, e);
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}
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}
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}
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}
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