com.facebook.buck.test.XmlTestResultParser.java Source code

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Here is the source code for com.facebook.buck.test.XmlTestResultParser.java

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/*
 * Copyright 2012-present Facebook, Inc.
 *
 * 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.facebook.buck.test;

import com.facebook.buck.test.result.type.ResultType;
import com.facebook.buck.util.XmlDomParser;
import com.google.common.base.Charsets;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.io.Files;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

import java.io.File;
import java.io.IOException;
import java.io.StringReader;
import java.util.List;

public class XmlTestResultParser {

    /** Utility Class:  Do not instantiate. */
    private XmlTestResultParser() {
    }

    public static TestCaseSummary parse(File xmlFile) throws IOException {
        String xmlFileContents = Files.toString(xmlFile, Charsets.UTF_8);

        try {
            return doParse(xmlFileContents);
        } catch (NumberFormatException e) {
            // This is an attempt to track down an inexplicable error that we have observed in the wild.
            String message = createDetailedExceptionMessage(xmlFile, xmlFileContents);
            throw new RuntimeException(message, e);
        }
    }

    private static TestCaseSummary doParse(String xml) throws IOException {
        Document doc = XmlDomParser.parse(new InputSource(new StringReader(xml)), /* namespaceAware */ true);
        Element root = doc.getDocumentElement();
        Preconditions.checkState("testcase".equals(root.getTagName()));
        String testCaseName = root.getAttribute("name");

        NodeList testElements = doc.getElementsByTagName("test");
        List<TestResultSummary> testResults = Lists.newArrayListWithCapacity(testElements.getLength());
        for (int i = 0; i < testElements.getLength(); i++) {
            Element node = (Element) testElements.item(i);
            String testName = node.getAttribute("name");
            long time = Long.parseLong(node.getAttribute("time"));
            String typeString = node.getAttribute("type");
            ResultType type = ResultType.valueOf(typeString);

            String message;
            String stacktrace;
            if (type == ResultType.SUCCESS) {
                message = null;
                stacktrace = null;
            } else {
                message = node.getAttribute("message");
                stacktrace = node.getAttribute("stacktrace");
            }

            NodeList stdoutElements = node.getElementsByTagName("stdout");
            String stdOut;
            if (stdoutElements.getLength() == 1) {
                stdOut = stdoutElements.item(0).getTextContent();
            } else {
                stdOut = null;
            }

            NodeList stderrElements = node.getElementsByTagName("stderr");
            String stdErr;
            if (stderrElements.getLength() == 1) {
                stdErr = stderrElements.item(0).getTextContent();
            } else {
                stdErr = null;
            }

            TestResultSummary testResult = new TestResultSummary(testCaseName, testName, type, time, message,
                    stacktrace, stdOut, stdErr);
            testResults.add(testResult);
        }

        return new TestCaseSummary(testCaseName, testResults);
    }

    private static String createDetailedExceptionMessage(File xmlFile, String xmlFileContents) {
        String message = "Error parsing test result data in " + xmlFile.getAbsolutePath() + ".\n"
                + "File contents:\n" + xmlFileContents;
        return message;
    }
}