/*
* Copyright 2012 the original author or authors.
*
* 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 org.gradle.launcher.daemon.client;
import org.gradle.api.JavaVersion;
import org.gradle.internal.jvm.Jvm;
import org.gradle.internal.jvm.UnsupportedJavaRuntimeException;
import org.gradle.launcher.daemon.configuration.DaemonParameters;
import org.gradle.process.internal.ExecHandleBuilder;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class JvmVersionValidator {
void validate(DaemonParameters parameters) {
if (parameters.getEffectiveJavaHome().equals(Jvm.current().getJavaHome())) {
return;
}
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
ExecHandleBuilder builder = new ExecHandleBuilder();
builder.setWorkingDir(new File(".").getAbsolutePath());
builder.setCommandLine(parameters.getEffectiveJavaExecutable(), "-version");
builder.setStandardOutput(new ByteArrayOutputStream());
builder.setErrorOutput(outputStream);
builder.build().start().waitForFinish().assertNormalExitValue();
JavaVersion javaVersion = parseJavaVersionCommandOutput(new BufferedReader(new InputStreamReader(new ByteArrayInputStream(outputStream.toByteArray()))));
if (!javaVersion.isJava6Compatible()) {
throw UnsupportedJavaRuntimeException.configuredWithUnsupportedVersion("Gradle", JavaVersion.VERSION_1_6, javaVersion);
}
}
static JavaVersion parseJavaVersionCommandOutput(BufferedReader reader) {
try {
String versionStr = reader.readLine();
while (versionStr != null) {
Matcher matcher = Pattern.compile("(?:java|openjdk) version \"(.+?)\"").matcher(versionStr);
if (matcher.matches()) {
return JavaVersion.toVersion(matcher.group(1));
}
versionStr = reader.readLine();
}
} catch (IOException e) {
throw new org.gradle.api.UncheckedIOException(e);
}
throw new RuntimeException("Could not determine Java version.");
}
}