1 files changed, 177 insertions, 0 deletions
diff --git a/src/proguard/shrink/UsagePrinter.java b/src/proguard/shrink/UsagePrinter.java
new file mode 100644
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+++ b/src/proguard/shrink/UsagePrinter.java
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+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ *             of Java bytecode.
+ *
+ * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu)
+ *
+ * This program 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 of the License, or (at your option)
+ * any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+package proguard.shrink;
+
+import proguard.classfile.*;
+import proguard.classfile.util.*;
+import proguard.classfile.visitor.*;
+
+import java.io.PrintStream;
+
+
+/**
+ * This ClassVisitor prints out the classes and class members that have been
+ * marked as being used (or not used).
+ *
+ * @see UsageMarker
+ *
+ * @author Eric Lafortune
+ */
+public class UsagePrinter
+extends      SimplifiedVisitor
+implements   ClassVisitor,
+             MemberVisitor
+{
+    private final UsageMarker usageMarker;
+    private final boolean     printUnusedItems;
+    private final PrintStream ps;
+
+    // A field to remember the class name, if a header is needed for class members.
+    private String      className;
+
+
+    /**
+     * Creates a new UsagePrinter that prints to <code>System.out</code>.
+     * @param usageMarker      the usage marker that was used to mark the
+     *                         classes and class members.
+     * @param printUnusedItems a flag that indicates whether only unused items
+     *                         should be printed, or alternatively, only used
+     *                         items.
+     */
+    public UsagePrinter(UsageMarker usageMarker,
+                        boolean     printUnusedItems)
+    {
+        this(usageMarker, printUnusedItems, System.out);
+    }
+
+
+    /**
+     * Creates a new UsagePrinter that prints to the given stream.
+     * @param usageMarker      the usage marker that was used to mark the
+     *                         classes and class members.
+     * @param printUnusedItems a flag that indicates whether only unused items
+     *                         should be printed, or alternatively, only used
+     *                         items.
+     * @param printStream      the stream to which to print.
+     */
+    public UsagePrinter(UsageMarker usageMarker,
+                        boolean     printUnusedItems,
+                        PrintStream printStream)
+    {
+        this.usageMarker      = usageMarker;
+        this.printUnusedItems = printUnusedItems;
+        this.ps               = printStream;
+    }
+
+
+    // Implementations for ClassVisitor.
+
+    public void visitProgramClass(ProgramClass programClass)
+    {
+        if (usageMarker.isUsed(programClass))
+        {
+            if (printUnusedItems)
+            {
+                className = programClass.getName();
+
+                programClass.fieldsAccept(this);
+                programClass.methodsAccept(this);
+
+                className = null;
+            }
+            else
+            {
+                ps.println(ClassUtil.externalClassName(programClass.getName()));
+            }
+        }
+        else
+        {
+            if (printUnusedItems)
+            {
+                ps.println(ClassUtil.externalClassName(programClass.getName()));
+            }
+        }
+    }
+
+
+    // Implementations for MemberVisitor.
+
+    public void visitProgramField(ProgramClass programClass, ProgramField programField)
+    {
+        if (usageMarker.isUsed(programField) ^ printUnusedItems)
+        {
+            printClassNameHeader();
+
+            ps.println("    " +
+                       lineNumberRange(programClass, programField) +
+                       ClassUtil.externalFullFieldDescription(
+                           programField.getAccessFlags(),
+                           programField.getName(programClass),
+                           programField.getDescriptor(programClass)));
+        }
+    }
+
+
+    public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
+    {
+        if (usageMarker.isUsed(programMethod) ^ printUnusedItems)
+        {
+            printClassNameHeader();
+
+            ps.println("    " +
+                       lineNumberRange(programClass, programMethod) +
+                       ClassUtil.externalFullMethodDescription(
+                           programClass.getName(),
+                           programMethod.getAccessFlags(),
+                           programMethod.getName(programClass),
+                           programMethod.getDescriptor(programClass)));
+        }
+    }
+
+
+    // Small utility methods.
+
+    /**
+     * Prints the class name field. The field is then cleared, so it is not
+     * printed again.
+     */
+    private void printClassNameHeader()
+    {
+        if (className != null)
+        {
+            ps.println(ClassUtil.externalClassName(className) + ":");
+            className = null;
+        }
+    }
+
+
+    /**
+     * Returns the line number range of the given class member, followed by a
+     * colon, or just an empty String if no range is available.
+     */
+    private static String lineNumberRange(ProgramClass programClass, ProgramMember programMember)
+    {
+        String range = programMember.getLineNumberRange(programClass);
+        return range != null ?
+            (range + ":") :
+            "";
+    }
+}