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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/rmi/activation/ActivationGroupDesc.java | |
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Diffstat (limited to 'libjava/classpath/java/rmi/activation/ActivationGroupDesc.java')
-rw-r--r-- | libjava/classpath/java/rmi/activation/ActivationGroupDesc.java | 433 |
1 files changed, 433 insertions, 0 deletions
diff --git a/libjava/classpath/java/rmi/activation/ActivationGroupDesc.java b/libjava/classpath/java/rmi/activation/ActivationGroupDesc.java new file mode 100644 index 000000000..a0c88ec0a --- /dev/null +++ b/libjava/classpath/java/rmi/activation/ActivationGroupDesc.java @@ -0,0 +1,433 @@ +/* ActivationGroupDesc.java -- the RMI activation group descriptor + Copyright (c) 1996, 1997, 1998, 1999, 2004, 2006 + Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.rmi.activation; + +import gnu.java.rmi.activation.DefaultActivationGroup; + +import java.io.Serializable; +import java.rmi.MarshalledObject; +import java.util.Arrays; +import java.util.Enumeration; +import java.util.Iterator; +import java.util.Properties; +import java.util.TreeSet; +import java.util.zip.Adler32; + +/** + * Contains information, necessary to create of recreate the activation objects. + * The group descriptor contains: + * <ul> + * <li>The name of the group's class. This class is derived from the + * {@link ActivationGroup}.</li> + * <li>The group class code location.</li> + * <li>The marshalled object that contains the group specific initialization + * information</li> + * </ul> + * The groups are created by the {@link ActivationGroup#createGroup} method that + * expectes the group class to have the two parameter constructor, the first + * parameter being the {@link ActivationGroupID} and the second the + * {@link MarshalledObject}. + * + * @author Audrius Meskauskas (audriusa@bioinformatics.org) (from stub) + */ +public final class ActivationGroupDesc + implements Serializable +{ + /** + * Contains the startup options for the {@link ActivationGroup} + * implementations. Allows to override system properties and specify other + * options for the implementation groups. + * + * @author Audrius Meskauskas (audriusa@bioinformatics.org) (from stub) + */ + public static class CommandEnvironment + implements Serializable + { + + /** + * Use the SVUID for interoperability. + */ + static final long serialVersionUID = 6165754737887770191L; + + /** + * The zero size string array used as argv value when null is passed. + */ + private static final String[] NO_ARGS = new String[0]; + + /** + * The path to the java executable (or null for using default jre). + */ + final String command; + + /** + * The extra parameters (may be empty array but never null). + */ + final String[] options; + + /** + * Create the new command environment. + * + * @param commandPatch the full path (and name) to the java executable of + * null for using the default executable. + * @param args extra options that will be used when creating the activation + * group. Null has the same effect as the empty list. + */ + public CommandEnvironment(String commandPatch, String[] args) + { + command = commandPatch; + if (args != null) + options = args; + else + options = NO_ARGS; + } + + /** + * Get the path to the java executable. + * + * @return the path to the java executable or null for using the default + * jre. + */ + public String getCommandPath() + { + return command; + } + + /** + * Get the additional command options. + * + * @return the command options array, may be empty string + */ + public String[] getCommandOptions() + { + return options; + } + + /** + * Compare for content equality. + */ + public boolean equals(Object obj) + { + if (obj instanceof CommandEnvironment) + { + CommandEnvironment that = (CommandEnvironment) obj; + + if (command == null || that.command == null) + { + // Use direct comparison if null is involved. + if (command != that.command) + return false; + } + else + { + // Use .equals if null is not involved. + if (! this.command.equals(that.command)) + return false; + } + + return Arrays.equals(options, that.options); + } + else + return false; + } + + /** + * Get the hash code. + */ + public int hashCode() + { + int h = command == null ? 0 : command.hashCode(); + for (int i = 0; i < options.length; i++) + h ^= options[i].hashCode(); + + return h; + } + } + + /** + * Use the SVUID for interoperability. + */ + static final long serialVersionUID = - 4936225423168276595L; + + /** + * The group class name or null for the default group class implementation. + */ + final String className; + + /** + * The group class download location URL (codebase), ignored by the + * default implementation. + */ + final String location; + + /** + * The group initialization data. + */ + final MarshalledObject<?> data; + + /** + * The path to the group jre and the parameters of this jre, may be + * null for the default jre. + */ + final ActivationGroupDesc.CommandEnvironment env; + + /** + * The properties that override the system properties. + */ + final Properties props; + + /** + * The cached hash code. + */ + transient long hash; + + /** + * Create the new activation group descriptor that will use the default + * activation group implementation with the given properties and + * environment. + * + * @param aProperties the properties that override the system properties + * @param environment the command line (and parameters), indicating, where to + * find the jre executable and with that parameters to call it. May + * be null if the default executable should be used. In this case, + * the activation group with the null name (the system default group) + * will be created. + */ + public ActivationGroupDesc(Properties aProperties, + ActivationGroupDesc.CommandEnvironment environment) + { + this(DefaultActivationGroup.class.getName(), null, null, aProperties, + environment); + } + + /** + * Create the new activation group descriptor. + * + * @param aClassName the name of the group implementation class. The null + * value indicates the default implementation. + * @param aLocation the location, from where the group implementation class + * should be loaded (ignored for the system default implementation). + * @param aData the group intialization data + * @param aProperties the properties that will override the system properties + * of the new group. These properties will be translated into -D + * options. + * @param environment the record, containing path to the jre executable and + * start options for the jre or null for using the default jre and + * options. + */ + public ActivationGroupDesc(String aClassName, String aLocation, + MarshalledObject<?> aData, Properties aProperties, + ActivationGroupDesc.CommandEnvironment environment) + { + className = aClassName; + location = aLocation; + data = aData; + props = aProperties; + env = environment; + } + + /** + * Get the activation group class name. + * + * @return the activation group class name (null for default implementation) + */ + public String getClassName() + { + return className; + } + + /** + * Get the location, from where the group class will be loaded + * + * @return the location, from where the implementation should be loaded (null + * for the default implementation) + */ + public String getLocation() + { + return location; + } + + /** + * Get the group intialization data. + * + * @return the group intialization data in the marshalled form. + */ + public MarshalledObject<?> getData() + { + return data; + } + + /** + * Get the overridded system properties. + * + * @return the overridden group system properties. + */ + public Properties getPropertyOverrides() + { + return props; + } + + /** + * Get the group command environment, containing path to the jre executable + * and startup options. + * + * @return the command environment or null if the default environment should + * be used. + */ + public ActivationGroupDesc.CommandEnvironment getCommandEnvironment() + { + return env; + } + + /** + * Compare for the content equality. + */ + public boolean equals(Object obj) + { + if (obj instanceof ActivationGroupDesc) + { + ActivationGroupDesc that = (ActivationGroupDesc) obj; + + // Ensure the hashcodes are computed. + if (hash == 0) + hashCode(); + if (that.hash == 0) + that.hashCode(); + + // We compare the hash fields as they are type long rather than int. + if (hash != that.hash) + return false; + + if (! eq(className, that.className)) + return false; + if (! eq(data, that.data)) + return false; + if (! eq(env, that.env)) + return false; + if (! eq(location, that.location)) + return false; + + // Compare the properties. + if (eq(props, that.props)) + return true; + + if (props.size() != that.props.size()) + return false; + + Enumeration en = props.propertyNames(); + Object key, value; + + while (en.hasMoreElements()) + { + key = en.nextElement(); + if (! that.props.containsKey(key)) + return false; + if (! eq(props.get(key), that.props.get(key))) + return false; + } + return true; + } + else + return false; + } + + /** + * Compare for direct equality if one or both parameters are null, otherwise + * call .equals. + */ + static boolean eq(Object a, Object b) + { + if (a == null || b == null) + return a == b; + else + return a.equals(b); + } + + /** + * Return the hashcode. + */ + public int hashCode() + { + if (hash==0) + { + // Using Adler32 - the hashcode is cached, will be computed only + // once and due need to scan properties is the expensive operation + // anyway. Reliability is more important. + Adler32 adler = new Adler32(); + if (className!=null) + adler.update(className.getBytes()); + if (data!=null) + adler.update(data.hashCode()); + if (env!=null) + adler.update(env.hashCode()); + if (location!=null) + adler.update(location.getBytes()); + if (props!=null) + { + Enumeration en = props.propertyNames(); + + // Using the intermediate sorted set to ensure that the + // properties are sorted. + TreeSet pr = new TreeSet(); + + Object key; + Object value; + while (en.hasMoreElements()) + { + key = en.nextElement(); + if (key!=null) + pr.add(key); + } + + Iterator it = pr.iterator(); + while (it.hasNext()) + { + key = it.next(); + value = props.get(key); + adler.update(key.hashCode()); + if (value!=null) + adler.update(value.hashCode()); + } + } + hash = adler.getValue(); + } + return (int) hash; + } + +} |