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Jodd Core tools and huge number of utilities.
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// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

package jodd.system;


import java.util.ArrayList;

abstract class JavaInfo extends HostInfo {

	private final String JAVA_VERSION = SystemUtil.get("java.version");
	private final int JAVA_VERSION_NUMBER = detectJavaVersionNumber();
	private final String JAVA_VENDOR = SystemUtil.get("java.vendor");
	private final String JAVA_VENDOR_URL = SystemUtil.get("java.vendor.url");
	private final String JAVA_SPECIFICATION_VERSION = SystemUtil.get("java.specification.version");
	private final String JAVA_SPECIFICATION_NAME = SystemUtil.get("java.specification.name");
	private final String JAVA_SPECIFICATION_VENDOR = SystemUtil.get("java.specification.vendor");
	private final String[] JRE_PACKAGES = buildJrePackages(JAVA_VERSION_NUMBER);

	/**
	 * Returns Java version string, as specified in system property.
	 * Returned string contain major version, minor version and revision.
	 */
	public String getJavaVersion() {
		return JAVA_VERSION;
	}

	/**
	 * Returns unified Java version as an integer.
	 */
	public int getJavaVersionNumber() {
		return JAVA_VERSION_NUMBER;
	}

	/**
	 * Returns Java vendor.
	 */
	public String getJavaVendor() {
		return JAVA_VENDOR;
	}

	/**
	 * Returns Java vendor URL.
	 */
	public String getJavaVendorURL() {
		return JAVA_VENDOR_URL;
	}

	/**
	 * Retrieves the version of the currently running JVM.
	 */
	public String getJavaSpecificationVersion() {
		return JAVA_SPECIFICATION_VERSION;
	}

	public final String getJavaSpecificationName() {
		return JAVA_SPECIFICATION_NAME;
	}

	public final String getJavaSpecificationVendor() {
		return JAVA_SPECIFICATION_VENDOR;
	}

	// ---------------------------------------------------------------- packages

	/**
	 * Returns list of packages, build into runtime jars.
	 */
	public String[] getJrePackages() {
		return JRE_PACKAGES;
	}

	/**
	 * Builds a set of java core packages.
	 */
	private String[] buildJrePackages(final int javaVersionNumber) {
		final ArrayList packages = new ArrayList<>();

		switch (javaVersionNumber) {
			case 9:
			case 8:
			case 7:
			case 6:
			case 5:
				// in Java1.5, the apache stuff moved
				packages.add("com.sun.org.apache");
				// fall through...
			case 4:
				if (javaVersionNumber == 4) {
					packages.add("org.apache.crimson");
					packages.add("org.apache.xalan");
					packages.add("org.apache.xml");
					packages.add("org.apache.xpath");
				}
				packages.add("org.ietf.jgss");
				packages.add("org.w3c.dom");
				packages.add("org.xml.sax");
				// fall through...
			case 3:
				packages.add("org.omg");
				packages.add("com.sun.corba");
				packages.add("com.sun.jndi");
				packages.add("com.sun.media");
				packages.add("com.sun.naming");
				packages.add("com.sun.org.omg");
				packages.add("com.sun.rmi");
				packages.add("sunw.io");
				packages.add("sunw.util");
				// fall through...
			case 2:
				packages.add("com.sun.java");
				packages.add("com.sun.image");
				// fall through...
			case 1:
			default:
				// core stuff
				packages.add("sun");
				packages.add("java");
				packages.add("javax");
				break;
		}

		return packages.toArray(new String[0]);
	}



	// ---------------------------------------------------------------- java checks

	private int detectJavaVersionNumber() {
		String javaVersion = JAVA_VERSION;

		final int lastDashNdx = javaVersion.lastIndexOf('-');
		if (lastDashNdx != -1) {
			javaVersion = javaVersion.substring(0, lastDashNdx);
		}

		if (javaVersion.startsWith("1.")) {
			// up to java 8
			final int index = javaVersion.indexOf('.', 2);
			return Integer.parseInt(javaVersion.substring(2, index));
		} else {
			final int index = javaVersion.indexOf('.');
			return Integer.parseInt(index == -1 ? javaVersion : javaVersion.substring(0, index));
		}
	}

	/**
	 * Checks if the currently running JVM is at least compliant
	 * with provided JDK version.
	 */
	public boolean isAtLeastJavaVersion(final int version) {
		return JAVA_VERSION_NUMBER >= version;
	}

	/**
	 * Checks if the currently running JVM is equal to provided version.
	 */
	public boolean isJavaVersion(final int version) {
		return JAVA_VERSION_NUMBER == version;
	}

	@Override
	public String toString() {
		return
			super.toString() +
			"\nJava version:       " + getJavaVersion() +
			"\nJava vendor:        " + getJavaVendor() +
			"\nJava vendor URL:    " + getJavaVendorURL() +
			"\nJava spec. name:    " + getJavaSpecificationName() +
			"\nJava spec. version: " + getJavaSpecificationVersion() +
			"\nJava spec. vendor:  " + getJavaSpecificationVendor();
	}
}