ProcessConfiguration.java

/*
 * Copyright 2010-2013 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.springframework.cloud.stream.modules.test.gemfire.process;

import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

/**
 * The ProcessContext class is a container encapsulating configuration and context meta-data for a running process.
 * @author John Blum
 * @see java.lang.ProcessBuilder
 * @since 1.5.0
 */
public class ProcessConfiguration {

	private final boolean redirectingErrorStream;

	private final File workingDirectory;

	private final List<String> command;

	private final Map<String, String> environment;

	public static ProcessConfiguration create(final ProcessBuilder processBuilder) {
		Assert.notNull(processBuilder, "The ProcessBuilder used to construct, configure and start the Process must " +
				"not" +
				" be null!");

		return new ProcessConfiguration(processBuilder.command(), processBuilder.directory(),
				processBuilder.environment(), processBuilder.redirectErrorStream());
	}

	public ProcessConfiguration(final List<String> command, final File workingDirectory,
			final Map<String, String> environment, final boolean redirectingErrorStream) {

		Assert.notEmpty(command, "The command used to run the process must be specified!");

		Assert.isTrue((workingDirectory != null && workingDirectory.isDirectory()), String.format(
				"The process working directory (%1$s) is not valid!", workingDirectory));

		this.command = new ArrayList<String>(command);
		this.workingDirectory = workingDirectory;
		this.redirectingErrorStream = redirectingErrorStream;

		this.environment = (environment != null
				? Collections.unmodifiableMap(new HashMap<String, String>(environment))
				: Collections.<String, String>emptyMap());
	}

	public List<String> getCommand() {
		return Collections.unmodifiableList(command);
	}

	public String getCommandString() {
		return StringUtils.arrayToDelimitedString(getCommand().toArray(), " ");
	}

	public Map<String, String> getEnvironment() {
		return environment;
	}

	public boolean isRedirectingErrorStream() {
		return redirectingErrorStream;
	}

	public File getWorkingDirectory() {
		return workingDirectory;
	}

	@Override
	public String toString() {
		return "{ command = ".concat(getCommandString())
				.concat(", workingDirectory = ".concat(getWorkingDirectory().getAbsolutePath()))
				.concat(", redirectingErrorStream = ".concat(String.valueOf(isRedirectingErrorStream())))
				.concat(", environment = ".concat(String.valueOf(getEnvironment())))
				.concat(" }");
	}

}