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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/javax/print/PrintServiceLookup.java
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+/* PrintServiceLookup.java --
+ Copyright (C) 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 javax.print;
+
+import gnu.classpath.ServiceFactory;
+import gnu.javax.print.CupsPrintServiceLookup;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Iterator;
+
+import javax.print.attribute.AttributeSet;
+
+
+/**
+ * <code>PrintServiceLookup</code> implementations provide a way to lookup
+ * print services based on different constraints.
+ * <p>
+ * Implementations are located and loaded automatically through the SPI JAR
+ * file specification. Therefore implementation classes must provide a default
+ * constructor for instantiation. Furthermore, applications are able to
+ * register further instances directly at runtime.
+ * </p><p>
+ * If an SecurityManager is installed implementors should call
+ * <code>checkPrintJobAccess()</code> to disable access for untrusted code.
+ * This check is to be made in every lookup service implementation for
+ * flexibility. Print services registered by applications through
+ * <code>registerService(PrintService)</code> are suppressed in the
+ * lookup results if a security manager is installed and disallows access.
+ * </p>
+ *
+ * @author Michael Koch (konqueror@gmx.de)
+ * @author Wolfgang Baer (WBaer@gmx.de)
+ */
+public abstract class PrintServiceLookup
+{
+
+ private static final CupsPrintServiceLookup systemProvider;
+ private static final HashSet printServices;
+ private static final HashSet printServiceLookups;
+
+ static
+ {
+ systemProvider = new CupsPrintServiceLookup();
+
+ printServices = new HashSet();
+ printServiceLookups = new HashSet();
+
+ // check for service providers
+ Iterator it = ServiceFactory.lookupProviders(PrintServiceLookup.class);
+
+ while (it.hasNext())
+ printServiceLookups.add(it.next());
+ }
+
+ /**
+ * Constructs a <code>PrintServiceLookup</code> object.
+ */
+ public PrintServiceLookup()
+ {
+ // nothing to do here
+ }
+
+ /**
+ * Explicitly registers the provided print service lookup implementation.
+ * <p>
+ * The registration will silently fail (returning <code>false</code>) if
+ * the lookup service is already registered or the registration somehow
+ * else fails.
+ * </p>
+ *
+ * @param sp the print service lookup implementation to register.
+ * @return <code>true</code> if registered, <code>false</code> otherwise.
+ */
+ public static boolean registerServiceProvider(PrintServiceLookup sp)
+ {
+ return printServiceLookups.add(sp);
+ }
+
+ /**
+ * Explicitly registers the provided print service instance.
+ * <p>
+ * The registration will silently fail (returning <code>false</code>) if
+ * the print service instance is already registered or the registration
+ * somehow else fails.
+ * </p>
+ * @param service the single print service to register.
+ * @return <code>true</code> if registered, <code>false</code> otherwise.
+ */
+ public static boolean registerService(PrintService service)
+ {
+ if (service instanceof StreamPrintService)
+ return false;
+
+ // security
+ try
+ {
+ SecurityManager sm = System.getSecurityManager();
+ if (sm != null)
+ sm.checkPrintJobAccess();
+
+ return printServices.add(service);
+ }
+ catch (SecurityException se)
+ {
+ return false;
+ }
+ }
+
+ /**
+ * Searches print services capable of printing in the given document flavor
+ * which supports the specified printing attributes.
+ *
+ * @param flavor the document flavor to support. If <code>null</code> this
+ * constraint is ignored during lookup.
+ * @param attributes the printing attributes to support. If
+ * <code>null</code> this constraint is ignored during lookup.
+ * @return The resulting available print services, or an array of length 0
+ * if none is found.
+ */
+ public static final PrintService[] lookupPrintServices(DocFlavor flavor,
+ AttributeSet attributes)
+ {
+ ArrayList result = new ArrayList();
+
+ PrintService[] services =
+ systemProvider.getPrintServices(flavor, attributes);
+ result.addAll(Arrays.asList(services));
+
+ for (Iterator it = printServiceLookups.iterator(); it.hasNext(); )
+ {
+ PrintServiceLookup lookup = (PrintServiceLookup) it.next();
+ services = lookup.getPrintServices(flavor, attributes);
+ result.addAll(Arrays.asList(services));
+ }
+
+ for (Iterator it = printServices.iterator(); it.hasNext(); )
+ {
+ PrintService service = (PrintService) it.next();
+ if (systemProvider.checkPrintService(flavor, attributes, service))
+ result.add(service);
+ }
+
+ return (PrintService[]) result.toArray(new PrintService[result.size()]);
+ }
+
+ /**
+ * Searches print services capable of multi document printing in all of the
+ * given document flavors and supporting the specified printing attributes.
+ *
+ * @param flavors the document flavors to support. If <code>null</code> this
+ * constraint is ignored during lookup.
+ * @param attributes the printing attributes to support. If
+ * <code>null</code> this constraint is ignored during lookup.
+ * @return The resulting available multi document print services, or an
+ * array of length 0 if none is found.
+ */
+ public static final MultiDocPrintService[] lookupMultiDocPrintServices(
+ DocFlavor[] flavors, AttributeSet attributes)
+ {
+ ArrayList result = new ArrayList();
+
+ MultiDocPrintService[] services =
+ systemProvider.getMultiDocPrintServices(flavors, attributes);
+ result.addAll(Arrays.asList(services));
+
+ for (Iterator it = printServiceLookups.iterator(); it.hasNext(); )
+ {
+ PrintServiceLookup lookup = (PrintServiceLookup) it.next();
+ services = lookup.getMultiDocPrintServices(flavors, attributes);
+ result.addAll(Arrays.asList(services));
+ }
+
+ for (Iterator it = printServices.iterator(); it.hasNext(); )
+ {
+ PrintService service = (PrintService) it.next();
+ if (systemProvider.checkMultiDocPrintService(flavors, attributes, service))
+ result.add(service);
+ }
+
+ return (MultiDocPrintService[]) result.toArray(
+ new MultiDocPrintService[result.size()]);
+ }
+
+
+ /**
+ * Searches the default print service in the current environment.
+ * <p>
+ * If multiple lookup services are registered and each has a default
+ * print service the result is not specified. Usually the default
+ * print service of the native platform lookup service is returned.
+ * </p><p>
+ * The GNU classpath implementation will return the CUPS default
+ * printing service as the default print service, if available.
+ * </p><p>
+ * The default print service may be overriden by users through
+ * the property <code>javax.print.defaultPrinter</code>. A service
+ * specified must be found to be returned as the default.
+ * </p>
+ *
+ * @return The default print service, or <code>null</code> if none found.
+ */
+ public static final PrintService lookupDefaultPrintService()
+ {
+ // TODO Find out what the property controls and use it
+ // String defaultPrinter = System.getProperty("javax.print.defaultPrinter");
+
+ // first test for platform specified default services
+ PrintService service = systemProvider.getDefaultPrintService();
+
+ if (service != null)
+ return service;
+
+ // none available by systemDefaultProvider
+ // search in other registered ones and take first
+ for (Iterator it = printServiceLookups.iterator(); it.hasNext(); )
+ {
+ service = ((PrintServiceLookup) it.next()).getDefaultPrintService();
+ if (service != null)
+ return service;
+ }
+
+ return null;
+ }
+
+ /**
+ * Not to be called directly by applications.
+ *
+ * @return The default lookup service of the implementing lookup service or
+ * <code>null</code> if there is no default one.
+ */
+ public abstract PrintService getDefaultPrintService();
+
+ /**
+ * Not to be called directly by applications.
+ *
+ * @param flavors the document flavors which have to be supported.
+ * @param attributes the attributes which have to be supported.
+ *
+ * @return The multidoc print services of the implementing lookup service
+ * for the given parameters, or an array of length 0 if none is available.
+ */
+ public abstract MultiDocPrintService[]
+ getMultiDocPrintServices(DocFlavor[] flavors, AttributeSet attributes);
+
+ /**
+ * Not to be called directly by applications.
+ *
+ * @return All known print services of the implementing lookup service
+ * regardless of supported features, or an array of length 0 if none is
+ * available.
+ */
+ public abstract PrintService[] getPrintServices();
+
+ /**
+ * Not to be called directly by applications.
+ *
+ * @param flavor the document flavor which has to be supported.
+ * @param attributes the attributes which have to be supported.
+ *
+ * @return The print services of the implementing lookup service
+ * for the given parameters, or an array of length 0 if none is available.
+ */
+ public abstract PrintService[]
+ getPrintServices(DocFlavor flavor, AttributeSet attributes);
+}