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⏎ com/sun/mail/util/PropUtil.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2018 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://oss.oracle.com/licenses/CDDL+GPL-1.1
 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.mail.util;

import java.util.*;
import javax.mail.Session;

/**
 * Utilities to make it easier to get property values.
 * Properties can be strings or type-specific value objects.
 *
 * @author Bill Shannon
 */
public class PropUtil {

    // No one should instantiate this class.
    private PropUtil() {
    }

    /**
     * Get an integer valued property.
     *
     * @param	props	the properties
     * @param	name	the property name
     * @param	def	default value if property not found
     * @return		the property value
     */
    public static int getIntProperty(Properties props, String name, int def) {
	return getInt(getProp(props, name), def);
    }

    /**
     * Get a boolean valued property.
     *
     * @param	props	the properties
     * @param	name	the property name
     * @param	def	default value if property not found
     * @return		the property value
     */
    public static boolean getBooleanProperty(Properties props,
				String name, boolean def) {
	return getBoolean(getProp(props, name), def);
    }

    /**
     * Get an integer valued property.
     *
     * @param	session	the Session
     * @param	name	the property name
     * @param	def	default value if property not found
     * @return		the property value
     */
    @Deprecated
    public static int getIntSessionProperty(Session session,
				String name, int def) {
	return getInt(getProp(session.getProperties(), name), def);
    }

    /**
     * Get a boolean valued property.
     *
     * @param	session	the Session
     * @param	name	the property name
     * @param	def	default value if property not found
     * @return		the property value
     */
    @Deprecated
    public static boolean getBooleanSessionProperty(Session session,
				String name, boolean def) {
	return getBoolean(getProp(session.getProperties(), name), def);
    }

    /**
     * Get a boolean valued System property.
     *
     * @param	name	the property name
     * @param	def	default value if property not found
     * @return		the property value
     */
    public static boolean getBooleanSystemProperty(String name, boolean def) {
	try {
	    return getBoolean(getProp(System.getProperties(), name), def);
	} catch (SecurityException sex) {
	    // fall through...
	}

	/*
	 * If we can't get the entire System Properties object because
	 * of a SecurityException, just ask for the specific property.
	 */
	try {
	    String value = System.getProperty(name);
	    if (value == null)
		return def;
	    if (def)
		return !value.equalsIgnoreCase("false");
	    else
		return value.equalsIgnoreCase("true");
	} catch (SecurityException sex) {
	    return def;
	}
    }

    /**
     * Get the value of the specified property.
     * If the "get" method returns null, use the getProperty method,
     * which might cascade to a default Properties object.
     */
    private static Object getProp(Properties props, String name) {
	Object val = props.get(name);
	if (val != null)
	    return val;
	else
	    return props.getProperty(name);
    }

    /**
     * Interpret the value object as an integer,
     * returning def if unable.
     */
    private static int getInt(Object value, int def) {
	if (value == null)
	    return def;
	if (value instanceof String) {
	    try {
		return Integer.parseInt((String)value);
	    } catch (NumberFormatException nfex) { }
	}
	if (value instanceof Integer)
	    return ((Integer)value).intValue();
	return def;
    }

    /**
     * Interpret the value object as a boolean,
     * returning def if unable.
     */
    private static boolean getBoolean(Object value, boolean def) {
	if (value == null)
	    return def;
	if (value instanceof String) {
	    /*
	     * If the default is true, only "false" turns it off.
	     * If the default is false, only "true" turns it on.
	     */
	    if (def)
		return !((String)value).equalsIgnoreCase("false");
	    else
		return ((String)value).equalsIgnoreCase("true");
	}
	if (value instanceof Boolean)
	    return ((Boolean)value).booleanValue();
	return def;
    }
}

⏎ com/sun/mail/util/PropUtil.java

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