366 lines
12 KiB
Java
366 lines
12 KiB
Java
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/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.common;
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import org.xmlpull.v1.XmlSerializer;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.OutputStreamWriter;
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import java.io.UnsupportedEncodingException;
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import java.io.Writer;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.charset.Charset;
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import java.nio.charset.CharsetEncoder;
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import java.nio.charset.CoderResult;
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import java.nio.charset.IllegalCharsetNameException;
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import java.nio.charset.UnsupportedCharsetException;
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/**
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* This is a quick and dirty implementation of XmlSerializer that isn't horribly
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* painfully slow like the normal one. It only does what is needed for the
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* specific XML files being written with it.
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*/
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public class FastXmlSerializer implements XmlSerializer {
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private static final String ESCAPE_TABLE[] = new String[] {
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null, null, null, null, null, null, null, null, // 0-7
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null, null, null, null, null, null, null, null, // 8-15
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null, null, null, null, null, null, null, null, // 16-23
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null, null, null, null, null, null, null, null, // 24-31
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null, null, """, null, null, null, "&", null, // 32-39
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null, null, null, null, null, null, null, null, // 40-47
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null, null, null, null, null, null, null, null, // 48-55
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null, null, null, null, "<", null, ">", null, // 56-63
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};
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private static final int BUFFER_LEN = 8192;
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private final char[] mText = new char[BUFFER_LEN];
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private int mPos;
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private Writer mWriter;
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private OutputStream mOutputStream;
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private CharsetEncoder mCharset;
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private ByteBuffer mBytes = ByteBuffer.allocate(BUFFER_LEN);
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private boolean mInTag;
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private void append(char c) throws IOException {
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int pos = mPos;
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if (pos >= (BUFFER_LEN-1)) {
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flush();
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pos = mPos;
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}
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mText[pos] = c;
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mPos = pos+1;
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}
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private void append(String str, int i, final int length) throws IOException {
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if (length > BUFFER_LEN) {
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final int end = i + length;
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while (i < end) {
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int next = i + BUFFER_LEN;
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append(str, i, next<end ? BUFFER_LEN : (end-i));
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i = next;
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}
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return;
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}
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int pos = mPos;
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if ((pos+length) > BUFFER_LEN) {
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flush();
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pos = mPos;
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}
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str.getChars(i, i+length, mText, pos);
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mPos = pos + length;
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}
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private void append(char[] buf, int i, final int length) throws IOException {
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if (length > BUFFER_LEN) {
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final int end = i + length;
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while (i < end) {
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int next = i + BUFFER_LEN;
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append(buf, i, next<end ? BUFFER_LEN : (end-i));
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i = next;
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}
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return;
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}
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int pos = mPos;
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if ((pos+length) > BUFFER_LEN) {
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flush();
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pos = mPos;
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}
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System.arraycopy(buf, i, mText, pos, length);
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mPos = pos + length;
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}
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private void append(String str) throws IOException {
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append(str, 0, str.length());
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}
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private void escapeAndAppendString(final String string) throws IOException {
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final int N = string.length();
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final char NE = (char)ESCAPE_TABLE.length;
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final String[] escapes = ESCAPE_TABLE;
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int lastPos = 0;
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int pos;
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for (pos=0; pos<N; pos++) {
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char c = string.charAt(pos);
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if (c >= NE) continue;
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String escape = escapes[c];
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if (escape == null) continue;
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if (lastPos < pos) append(string, lastPos, pos-lastPos);
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lastPos = pos + 1;
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append(escape);
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}
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if (lastPos < pos) append(string, lastPos, pos-lastPos);
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}
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private void escapeAndAppendString(char[] buf, int start, int len) throws IOException {
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final char NE = (char)ESCAPE_TABLE.length;
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final String[] escapes = ESCAPE_TABLE;
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int end = start+len;
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int lastPos = start;
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int pos;
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for (pos=start; pos<end; pos++) {
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char c = buf[pos];
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if (c >= NE) continue;
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String escape = escapes[c];
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if (escape == null) continue;
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if (lastPos < pos) append(buf, lastPos, pos-lastPos);
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lastPos = pos + 1;
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append(escape);
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}
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if (lastPos < pos) append(buf, lastPos, pos-lastPos);
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}
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public XmlSerializer attribute(String namespace, String name, String value) throws IOException,
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IllegalArgumentException, IllegalStateException {
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append(' ');
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if (namespace != null) {
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append(namespace);
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append(':');
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}
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append(name);
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append("=\"");
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escapeAndAppendString(value);
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append('"');
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return this;
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}
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public void cdsect(String text) throws IOException, IllegalArgumentException,
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IllegalStateException {
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throw new UnsupportedOperationException();
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}
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public void comment(String text) throws IOException, IllegalArgumentException,
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IllegalStateException {
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throw new UnsupportedOperationException();
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}
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public void docdecl(String text) throws IOException, IllegalArgumentException,
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IllegalStateException {
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throw new UnsupportedOperationException();
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}
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public void endDocument() throws IOException, IllegalArgumentException, IllegalStateException {
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flush();
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}
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public XmlSerializer endTag(String namespace, String name) throws IOException,
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IllegalArgumentException, IllegalStateException {
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if (mInTag) {
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append(" />\n");
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} else {
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append("</");
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if (namespace != null) {
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append(namespace);
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append(':');
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}
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append(name);
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append(">\n");
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}
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mInTag = false;
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return this;
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}
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public void entityRef(String text) throws IOException, IllegalArgumentException,
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IllegalStateException {
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throw new UnsupportedOperationException();
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}
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private void flushBytes() throws IOException {
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int position;
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if ((position = mBytes.position()) > 0) {
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mBytes.flip();
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mOutputStream.write(mBytes.array(), 0, position);
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mBytes.clear();
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}
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}
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public void flush() throws IOException {
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//Log.i("PackageManager", "flush mPos=" + mPos);
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if (mPos > 0) {
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if (mOutputStream != null) {
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CharBuffer charBuffer = CharBuffer.wrap(mText, 0, mPos);
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CoderResult result = mCharset.encode(charBuffer, mBytes, true);
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while (true) {
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if (result.isError()) {
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throw new IOException(result.toString());
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} else if (result.isOverflow()) {
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flushBytes();
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result = mCharset.encode(charBuffer, mBytes, true);
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continue;
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}
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break;
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}
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flushBytes();
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mOutputStream.flush();
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} else {
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mWriter.write(mText, 0, mPos);
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mWriter.flush();
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}
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mPos = 0;
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}
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}
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public int getDepth() {
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throw new UnsupportedOperationException();
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}
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public boolean getFeature(String name) {
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throw new UnsupportedOperationException();
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}
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public String getName() {
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throw new UnsupportedOperationException();
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}
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public String getNamespace() {
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throw new UnsupportedOperationException();
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}
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public String getPrefix(String namespace, boolean generatePrefix)
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throws IllegalArgumentException {
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throw new UnsupportedOperationException();
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}
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public Object getProperty(String name) {
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throw new UnsupportedOperationException();
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}
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public void ignorableWhitespace(String text) throws IOException, IllegalArgumentException,
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IllegalStateException {
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throw new UnsupportedOperationException();
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}
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public void processingInstruction(String text) throws IOException, IllegalArgumentException,
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IllegalStateException {
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throw new UnsupportedOperationException();
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}
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public void setFeature(String name, boolean state) throws IllegalArgumentException,
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IllegalStateException {
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if (name.equals("http://xmlpull.org/v1/doc/features.html#indent-output")) {
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return;
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}
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throw new UnsupportedOperationException();
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}
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public void setOutput(OutputStream os, String encoding) throws IOException,
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IllegalArgumentException, IllegalStateException {
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if (os == null)
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throw new IllegalArgumentException();
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if (true) {
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try {
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mCharset = Charset.forName(encoding).newEncoder();
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} catch (IllegalCharsetNameException e) {
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throw (UnsupportedEncodingException) (new UnsupportedEncodingException(
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encoding).initCause(e));
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} catch (UnsupportedCharsetException e) {
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throw (UnsupportedEncodingException) (new UnsupportedEncodingException(
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encoding).initCause(e));
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}
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mOutputStream = os;
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} else {
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setOutput(
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encoding == null
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? new OutputStreamWriter(os)
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: new OutputStreamWriter(os, encoding));
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}
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}
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public void setOutput(Writer writer) throws IOException, IllegalArgumentException,
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IllegalStateException {
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mWriter = writer;
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}
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public void setPrefix(String prefix, String namespace) throws IOException,
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IllegalArgumentException, IllegalStateException {
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throw new UnsupportedOperationException();
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}
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public void setProperty(String name, Object value) throws IllegalArgumentException,
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IllegalStateException {
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throw new UnsupportedOperationException();
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}
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public void startDocument(String encoding, Boolean standalone) throws IOException,
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IllegalArgumentException, IllegalStateException {
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append("<?xml version='1.0' encoding='utf-8' standalone='"
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+ (standalone ? "yes" : "no") + "' ?>\n");
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}
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public XmlSerializer startTag(String namespace, String name) throws IOException,
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IllegalArgumentException, IllegalStateException {
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if (mInTag) {
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append(">\n");
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}
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append('<');
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if (namespace != null) {
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append(namespace);
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append(':');
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}
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append(name);
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mInTag = true;
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return this;
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}
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public XmlSerializer text(char[] buf, int start, int len) throws IOException,
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IllegalArgumentException, IllegalStateException {
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if (mInTag) {
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append(">");
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mInTag = false;
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}
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escapeAndAppendString(buf, start, len);
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return this;
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}
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public XmlSerializer text(String text) throws IOException, IllegalArgumentException,
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IllegalStateException {
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if (mInTag) {
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append(">");
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mInTag = false;
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}
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escapeAndAppendString(text);
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return this;
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}
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}
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