| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.layoutlib.bridge.impl; |
| |
| |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| |
| import java.io.BufferedInputStream; |
| import java.io.ByteArrayInputStream; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * A factory for {@link XmlPullParser}. |
| * |
| */ |
| public class ParserFactory { |
| |
| public final static boolean LOG_PARSER = false; |
| |
| private final static String ENCODING = "UTF-8"; //$NON-NLS-1$ |
| |
| // Used to get a new XmlPullParser from the client. |
| @Nullable |
| private static com.android.ide.common.rendering.api.ParserFactory sParserFactory; |
| |
| public static void setParserFactory( |
| @Nullable com.android.ide.common.rendering.api.ParserFactory parserFactory) { |
| sParserFactory = parserFactory; |
| } |
| |
| @NonNull |
| public static XmlPullParser create(@NonNull File f) |
| throws XmlPullParserException, FileNotFoundException { |
| return create(f, false); |
| } |
| |
| public static XmlPullParser create(@NonNull File f, boolean isLayout) |
| throws XmlPullParserException, FileNotFoundException { |
| InputStream stream = new FileInputStream(f); |
| return create(stream, f.getName(), f.length(), isLayout); |
| } |
| @NonNull |
| public static XmlPullParser create(@NonNull InputStream stream, @Nullable String name) |
| throws XmlPullParserException { |
| return create(stream, name, -1, false); |
| } |
| |
| @NonNull |
| private static XmlPullParser create(@NonNull InputStream stream, @Nullable String name, |
| long size, boolean isLayout) throws XmlPullParserException { |
| XmlPullParser parser = instantiateParser(name); |
| |
| stream = readAndClose(stream, name, size); |
| |
| parser.setInput(stream, ENCODING); |
| if (isLayout) { |
| try { |
| return new LayoutParserWrapper(parser).peekTillLayoutStart(); |
| } catch (IOException e) { |
| throw new XmlPullParserException(null, parser, e); |
| } |
| } |
| return parser; |
| } |
| |
| @NonNull |
| public static XmlPullParser instantiateParser(@Nullable String name) |
| throws XmlPullParserException { |
| if (sParserFactory == null) { |
| throw new XmlPullParserException("ParserFactory not initialized."); |
| } |
| XmlPullParser parser = sParserFactory.createParser(name); |
| parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true); |
| return parser; |
| } |
| |
| @NonNull |
| private static InputStream readAndClose(@NonNull InputStream stream, @Nullable String name, |
| long size) throws XmlPullParserException { |
| // just a sanity check. It's doubtful we'll have such big files! |
| if (size > Integer.MAX_VALUE) { |
| throw new XmlPullParserException("File " + name + " is too big to be parsed"); |
| } |
| int intSize = (int) size; |
| |
| // create a buffered reader to facilitate reading. |
| BufferedInputStream bufferedStream = new BufferedInputStream(stream); |
| try { |
| int avail; |
| if (intSize != -1) { |
| avail = intSize; |
| } else { |
| // get the size to read. |
| avail = bufferedStream.available(); |
| } |
| |
| // create the initial buffer and read it. |
| byte[] buffer = new byte[avail]; |
| int read = stream.read(buffer); |
| |
| // this is the easy case. |
| if (read == intSize) { |
| return new ByteArrayInputStream(buffer); |
| } |
| |
| // check if there is more to read (read() does not necessarily read all that |
| // available() returned!) |
| while ((avail = bufferedStream.available()) > 0) { |
| if (read + avail > buffer.length) { |
| // just allocate what is needed. We're mostly reading small files |
| // so it shouldn't be too problematic. |
| byte[] moreBuffer = new byte[read + avail]; |
| System.arraycopy(buffer, 0, moreBuffer, 0, read); |
| buffer = moreBuffer; |
| } |
| |
| read += stream.read(buffer, read, avail); |
| } |
| |
| // return a new stream encapsulating this buffer. |
| return new ByteArrayInputStream(buffer); |
| |
| } catch (IOException e) { |
| throw new XmlPullParserException("Failed to read " + name, null, e); |
| } finally { |
| try { |
| bufferedStream.close(); |
| } catch (IOException ignored) { |
| } |
| } |
| } |
| } |