org.holoeverywhere.util.FastXmlSerializer Maven / Gradle / Ivy
package org.holoeverywhere.util;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
import java.nio.charset.IllegalCharsetNameException;
import java.nio.charset.UnsupportedCharsetException;
import org.xmlpull.v1.XmlSerializer;
public class FastXmlSerializer implements XmlSerializer {
private static final int BUFFER_LEN = 8192;
private static final String ESCAPE_TABLE[] = new String[] {
null, null,
null, null, null, null, null, null, // 0-7
null, null, null, null, null, null, null, null, // 8-15
null, null, null, null, null, null, null, null, // 16-23
null, null, null, null, null, null, null, null, // 24-31
null, null, """, null, null, null, "&", null, // 32-39
null, null, null, null, null, null, null, null, // 40-47
null, null, null, null, null, null, null, null, // 48-55
null, null, null, null, "<", null, ">", null, // 56-63
};
private ByteBuffer mBytes = ByteBuffer
.allocate(FastXmlSerializer.BUFFER_LEN);
private CharsetEncoder mCharset;
private boolean mInTag;
private OutputStream mOutputStream;
private int mPos;
private final char[] mText = new char[FastXmlSerializer.BUFFER_LEN];
private Writer mWriter;
private void append(char c) throws IOException {
int pos = mPos;
if (pos >= FastXmlSerializer.BUFFER_LEN - 1) {
flush();
pos = mPos;
}
mText[pos] = c;
mPos = pos + 1;
}
private void append(char[] buf, int i, final int length) throws IOException {
if (length > FastXmlSerializer.BUFFER_LEN) {
final int end = i + length;
while (i < end) {
int next = i + FastXmlSerializer.BUFFER_LEN;
append(buf, i, next < end ? FastXmlSerializer.BUFFER_LEN : end
- i);
i = next;
}
return;
}
int pos = mPos;
if (pos + length > FastXmlSerializer.BUFFER_LEN) {
flush();
pos = mPos;
}
System.arraycopy(buf, i, mText, pos, length);
mPos = pos + length;
}
private void append(String str) throws IOException {
append(str, 0, str.length());
}
private void append(String str, int i, final int length) throws IOException {
if (length > FastXmlSerializer.BUFFER_LEN) {
final int end = i + length;
while (i < end) {
int next = i + FastXmlSerializer.BUFFER_LEN;
append(str, i, next < end ? FastXmlSerializer.BUFFER_LEN : end
- i);
i = next;
}
return;
}
int pos = mPos;
if (pos + length > FastXmlSerializer.BUFFER_LEN) {
flush();
pos = mPos;
}
str.getChars(i, i + length, mText, pos);
mPos = pos + length;
}
@Override
public XmlSerializer attribute(String namespace, String name, String value)
throws IOException, IllegalArgumentException, IllegalStateException {
append(' ');
if (namespace != null) {
append(namespace);
append(':');
}
append(name);
append("=\"");
escapeAndAppendString(value);
append('"');
return this;
}
@Override
public void cdsect(String text) throws IOException,
IllegalArgumentException, IllegalStateException {
throw new UnsupportedOperationException();
}
@Override
public void comment(String text) throws IOException,
IllegalArgumentException, IllegalStateException {
throw new UnsupportedOperationException();
}
@Override
public void docdecl(String text) throws IOException,
IllegalArgumentException, IllegalStateException {
throw new UnsupportedOperationException();
}
@Override
public void endDocument() throws IOException, IllegalArgumentException,
IllegalStateException {
flush();
}
@Override
public XmlSerializer endTag(String namespace, String name)
throws IOException, IllegalArgumentException, IllegalStateException {
if (mInTag) {
append(" />\n");
} else {
append("\n");
}
mInTag = false;
return this;
}
@Override
public void entityRef(String text) throws IOException,
IllegalArgumentException, IllegalStateException {
throw new UnsupportedOperationException();
}
private void escapeAndAppendString(char[] buf, int start, int len)
throws IOException {
final char NE = (char) FastXmlSerializer.ESCAPE_TABLE.length;
final String[] escapes = FastXmlSerializer.ESCAPE_TABLE;
int end = start + len;
int lastPos = start;
int pos;
for (pos = start; pos < end; pos++) {
char c = buf[pos];
if (c >= NE) {
continue;
}
String escape = escapes[c];
if (escape == null) {
continue;
}
if (lastPos < pos) {
append(buf, lastPos, pos - lastPos);
}
lastPos = pos + 1;
append(escape);
}
if (lastPos < pos) {
append(buf, lastPos, pos - lastPos);
}
}
private void escapeAndAppendString(final String string) throws IOException {
final int N = string.length();
final char NE = (char) FastXmlSerializer.ESCAPE_TABLE.length;
final String[] escapes = FastXmlSerializer.ESCAPE_TABLE;
int lastPos = 0;
int pos;
for (pos = 0; pos < N; pos++) {
char c = string.charAt(pos);
if (c >= NE) {
continue;
}
String escape = escapes[c];
if (escape == null) {
continue;
}
if (lastPos < pos) {
append(string, lastPos, pos - lastPos);
}
lastPos = pos + 1;
append(escape);
}
if (lastPos < pos) {
append(string, lastPos, pos - lastPos);
}
}
@Override
public void flush() throws IOException {
// Log.i("PackageManager", "flush mPos=" + mPos);
if (mPos > 0) {
if (mOutputStream != null) {
CharBuffer charBuffer = CharBuffer.wrap(mText, 0, mPos);
CoderResult result = mCharset.encode(charBuffer, mBytes, true);
while (true) {
if (result.isError()) {
throw new IOException(result.toString());
} else if (result.isOverflow()) {
flushBytes();
result = mCharset.encode(charBuffer, mBytes, true);
continue;
}
break;
}
flushBytes();
mOutputStream.flush();
} else {
mWriter.write(mText, 0, mPos);
mWriter.flush();
}
mPos = 0;
}
}
private void flushBytes() throws IOException {
int position;
if ((position = mBytes.position()) > 0) {
mBytes.flip();
mOutputStream.write(mBytes.array(), 0, position);
mBytes.clear();
}
}
@Override
public int getDepth() {
throw new UnsupportedOperationException();
}
@Override
public boolean getFeature(String name) {
throw new UnsupportedOperationException();
}
@Override
public String getName() {
throw new UnsupportedOperationException();
}
@Override
public String getNamespace() {
throw new UnsupportedOperationException();
}
@Override
public String getPrefix(String namespace, boolean generatePrefix)
throws IllegalArgumentException {
throw new UnsupportedOperationException();
}
@Override
public Object getProperty(String name) {
throw new UnsupportedOperationException();
}
@Override
public void ignorableWhitespace(String text) throws IOException,
IllegalArgumentException, IllegalStateException {
throw new UnsupportedOperationException();
}
@Override
public void processingInstruction(String text) throws IOException,
IllegalArgumentException, IllegalStateException {
throw new UnsupportedOperationException();
}
@Override
public void setFeature(String name, boolean state)
throws IllegalArgumentException, IllegalStateException {
if (name.equals("http://xmlpull.org/v1/doc/features.html#indent-output")) {
return;
}
throw new UnsupportedOperationException();
}
@Override
public void setOutput(OutputStream os, String encoding) throws IOException,
IllegalArgumentException, IllegalStateException {
if (os == null) {
throw new IllegalArgumentException();
}
try {
mCharset = Charset.forName(encoding).newEncoder();
} catch (IllegalCharsetNameException e) {
throw (UnsupportedEncodingException) new UnsupportedEncodingException(
encoding).initCause(e);
} catch (UnsupportedCharsetException e) {
throw (UnsupportedEncodingException) new UnsupportedEncodingException(
encoding).initCause(e);
}
mOutputStream = os;
}
@Override
public void setOutput(Writer writer) throws IOException,
IllegalArgumentException, IllegalStateException {
mWriter = writer;
}
@Override
public void setPrefix(String prefix, String namespace) throws IOException,
IllegalArgumentException, IllegalStateException {
throw new UnsupportedOperationException();
}
@Override
public void setProperty(String name, Object value)
throws IllegalArgumentException, IllegalStateException {
throw new UnsupportedOperationException();
}
@Override
public void startDocument(String encoding, Boolean standalone)
throws IOException, IllegalArgumentException, IllegalStateException {
append("\n");
}
@Override
public XmlSerializer startTag(String namespace, String name)
throws IOException, IllegalArgumentException, IllegalStateException {
if (mInTag) {
append(">\n");
}
append('<');
if (namespace != null) {
append(namespace);
append(':');
}
append(name);
mInTag = true;
return this;
}
@Override
public XmlSerializer text(char[] buf, int start, int len)
throws IOException, IllegalArgumentException, IllegalStateException {
if (mInTag) {
append(">");
mInTag = false;
}
escapeAndAppendString(buf, start, len);
return this;
}
@Override
public XmlSerializer text(String text) throws IOException,
IllegalArgumentException, IllegalStateException {
if (mInTag) {
append(">");
mInTag = false;
}
escapeAndAppendString(text);
return this;
}
}
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