Automatic command list generation requires knowing what commands
are available to this runtime, and what name those commands can be
called as by the end-user. This lightweight wrappers carries the
data from the Command annotation, possibly filling in the name of
the command by generating it from the implementation class name.
Signed-off-by: Shawn O. Pearce <spearce@xxxxxxxxxxx>
---
.../src/org/spearce/jgit/pgm/CommandRef.java | 151 ++++++++++++++++++++
1 files changed, 151 insertions(+), 0 deletions(-)
create mode 100644 org.spearce.jgit.pgm/src/org/spearce/jgit/pgm/CommandRef.java
diff --git a/org.spearce.jgit.pgm/src/org/spearce/jgit/pgm/CommandRef.java b/org.spearce.jgit.pgm/src/org/spearce/jgit/pgm/CommandRef.java
new file mode 100644
index 0000000..40400a7
--- /dev/null
+++ b/org.spearce.jgit.pgm/src/org/spearce/jgit/pgm/CommandRef.java
@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) 2008, Shawn O. Pearce <spearce@xxxxxxxxxxx>
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - 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.
+ *
+ * - Neither the name of the Git Development Community nor the
+ * names of its contributors may be used to endorse or promote
+ * products derived from this software without specific prior
+ * written permission.
+ *
+ * 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 OWNER 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 org.spearce.jgit.pgm;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+/**
+ * Description of a command (a {@link TextBuiltin} subclass.
+ * <p>
+ * These descriptions are lightweight compared to creating a command instance
+ * and are therefore suitable for catalogs of "known" commands without linking
+ * the command's implementation and creating a dummy instance of the command.
+ */
+public class CommandRef {
+ private final Class<? extends TextBuiltin> impl;
+
+ private final String name;
+
+ private String usage;
+
+ boolean common;
+
+ CommandRef(final Class<? extends TextBuiltin> clazz) {
+ this(clazz, guessName(clazz));
+ }
+
+ CommandRef(final Class<? extends TextBuiltin> clazz, final Command cmd) {
+ this(clazz, cmd.name().length() > 0 ? cmd.name() : guessName(clazz));
+ usage = cmd.usage();
+ common = cmd.common();
+ }
+
+ private CommandRef(final Class<? extends TextBuiltin> clazz, final String cn) {
+ impl = clazz;
+ name = cn;
+ usage = "";
+ }
+
+ private static String guessName(final Class<? extends TextBuiltin> clazz) {
+ final StringBuilder s = new StringBuilder();
+ if (clazz.getName().startsWith("org.spearce.jgit.pgm.debug."))
+ s.append("debug-");
+
+ boolean lastWasDash = true;
+ for (final char c : clazz.getSimpleName().toCharArray()) {
+ if (Character.isUpperCase(c)) {
+ if (!lastWasDash)
+ s.append('-');
+ lastWasDash = !lastWasDash;
+ s.append(Character.toLowerCase(c));
+ } else {
+ s.append(c);
+ }
+ }
+ return s.toString();
+ }
+
+ /**
+ * @return name the command is invoked as from the command line.
+ */
+ public String getName() {
+ return name;
+ }
+
+ /**
+ * @return one line description of the command's feature set.
+ */
+ public String getUsage() {
+ return usage;
+ }
+
+ /**
+ * @return true if this command is considered to be commonly used.
+ */
+ public boolean isCommon() {
+ return common;
+ }
+
+ /**
+ * @return name of the Java class which implements this command.
+ */
+ public String getImplementationClassName() {
+ return impl.getName();
+ }
+
+ /**
+ * @return a new instance of the command implementation.
+ */
+ public TextBuiltin create() {
+ final Constructor<? extends TextBuiltin> c;
+ try {
+ c = impl.getDeclaredConstructor();
+ } catch (SecurityException e) {
+ throw new RuntimeException("Cannot create command " + getName(), e);
+ } catch (NoSuchMethodException e) {
+ throw new RuntimeException("Cannot create command " + getName(), e);
+ }
+ c.setAccessible(true);
+
+ final TextBuiltin r;
+ try {
+ r = c.newInstance();
+ } catch (InstantiationException e) {
+ throw new RuntimeException("Cannot create command " + getName(), e);
+ } catch (IllegalAccessException e) {
+ throw new RuntimeException("Cannot create command " + getName(), e);
+ } catch (IllegalArgumentException e) {
+ throw new RuntimeException("Cannot create command " + getName(), e);
+ } catch (InvocationTargetException e) {
+ throw new RuntimeException("Cannot create command " + getName(), e);
+ }
+ r.setCommandName(getName());
+ return r;
+ }
+}
--
1.6.0.rc0.182.gb96c7
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