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/*
* Copyright (C) 2015 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.sdklib.repository;
import com.google.common.collect.Lists;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.List;
import java.util.logging.Logger;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.stream.StreamSource;
/**
* Utilities related to the respository XSDs.
*/
public class RepoXsdUtil {
public static final String NODE_IMPORT = "import";
public static final String NODE_INCLUDE = "include";
public static final String ATTR_SCHEMA_LOCATION = "schemaLocation";
/**
* Gets StreamSources for the given xsd (implied by the name and version), as well as any xsds imported or included by the main one.
*
* @param rootElement The root of the filename of the XML schema. This is by convention the same
* as the root element declared by the schema.
* @param version The XML schema revision number, an integer >= 1.
*/
public static StreamSource[] getXsdStream(final String rootElement, int version) {
String filename = String.format("%1$s-%2$02d.xsd", rootElement, version); //$NON-NLS-1$
final List<StreamSource> streams = Lists.newArrayList();
InputStream stream = null;
try {
stream = RepoXsdUtil.class.getResourceAsStream(filename);
if (stream == null) {
filename = String.format("%1$s-%2$d.xsd", rootElement, version); //$NON-NLS-1$
stream = RepoXsdUtil.class.getResourceAsStream(filename);
}
if (stream == null) {
// Try the alternate schemas that are not published yet.
// This allows us to internally test with new schemas before the
// public repository uses it.
filename = String.format("-%1$s-%2$02d.xsd", rootElement, version); //$NON-NLS-1$
stream = RepoXsdUtil.class.getResourceAsStream(filename);
}
// Parse the schema and find any imports or includes so we can return them as well.
// Currently transitive includes are not supported.
SAXParserFactory.newInstance().newSAXParser().parse(stream, new DefaultHandler() {
@Override
public void startElement(String uri, String localName, String name, Attributes attributes) throws SAXException {
name = name.substring(name.indexOf(':') + 1);
if (name.equals(NODE_IMPORT) || name.equals(NODE_INCLUDE)) {
String importFile = attributes.getValue(ATTR_SCHEMA_LOCATION);
streams.add(new StreamSource(RepoXsdUtil.class.getResourceAsStream(importFile)));
}
}
});
// create and add the first stream again, since SaxParser closes the original one
streams.add(new StreamSource(RepoXsdUtil.class.getResourceAsStream(filename)));
} catch (Exception e) {
// Some implementations seem to return null on failure,
// others throw an exception. We want to return null.
return null;
}
return streams.toArray(new StreamSource[streams.size()]);
}
}
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