--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/com/go/trove/classfile/LocalVariableTableAttr.java	Sat Mar 21 11:00:06 2009 +0000
@@ -0,0 +1,275 @@
+/* ====================================================================
+ * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
+ * ====================================================================
+ * The Tea Software License, Version 1.1
+ *
+ * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. 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.
+ *
+ * 3. The end-user documentation included with the redistribution,
+ *    if any, must include the following acknowledgment:
+ *       "This product includes software developed by the
+ *        Walt Disney Internet Group (http://opensource.go.com/)."
+ *    Alternately, this acknowledgment may appear in the software itself,
+ *    if and wherever such third-party acknowledgments normally appear.
+ *
+ * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
+ *    not be used to endorse or promote products derived from this
+ *    software without prior written permission. For written
+ *    permission, please contact opensource@dig.com.
+ *
+ * 5. Products derived from this software may not be called "Tea",
+ *    "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
+ *    "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
+ *    written permission of the Walt Disney Internet Group.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 WALT DISNEY INTERNET GROUP OR ITS
+ * 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.
+ * ====================================================================
+ *
+ * For more information about Tea, please see http://opensource.go.com/.
+ */
+
+package com.go.trove.classfile;
+
+import java.util.*;
+import java.io.*;
+
+/******************************************************************************
+ * This class corresponds to the LocalVariableTable_attribute structure as 
+ * defined in section 4.7.7 of <i>The Java Virtual Machine Specification</i>.
+ * 
+ * @author Brian S O'Neill
+ * @version
+ * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/11/27 <!-- $-->
+ */
+class LocalVariableTableAttr extends Attribute {
+    private List mEntries = new ArrayList(10);
+    private List mCleanEntries;
+    private int mRangeCount;
+    
+    public LocalVariableTableAttr(ConstantPool cp) {
+        super(cp, LOCAL_VARIABLE_TABLE);
+    }
+    
+    /**
+     * Add an entry into the LocalVariableTableAttr.
+     */
+    public void addEntry(LocalVariable localVar) {
+        String varName = localVar.getName();
+        if (varName != null) {
+            ConstantUTFInfo name = ConstantUTFInfo.make(mCp, varName);
+            ConstantUTFInfo descriptor = 
+                ConstantUTFInfo.make(mCp, localVar.getType().toString());
+
+            mEntries.add(new Entry(localVar, name, descriptor));
+        }
+
+        mCleanEntries = null;
+    }
+    
+    public int getLength() {
+        clean();
+        return 2 + 10 * mRangeCount;
+    }
+    
+    public void writeDataTo(DataOutput dout) throws IOException {
+        dout.writeShort(mRangeCount);
+
+        int size = mCleanEntries.size();
+        for (int i=0; i<size; i++) {
+            Entry entry = (Entry)mEntries.get(i);
+            LocalVariable localVar = entry.mLocalVar;
+
+            SortedSet ranges = localVar.getLocationRangeSet();
+
+            int name_index = entry.mName.getIndex();
+            int descriptor_index = entry.mDescriptor.getIndex();
+            int index = localVar.getNumber();
+
+            check("local variable table entry name index", name_index);
+            check("local variable table entry descriptor index", 
+                  descriptor_index);
+            check("local variable table entry index", index);
+
+            Iterator it = ranges.iterator();
+            while (it.hasNext()) {
+                LocationRange range = (LocationRange)it.next();
+
+                Location startLocation = range.getStartLocation();
+                Location endLocation = range.getEndLocation();
+
+                int start_pc = startLocation.getLocation();
+                int length = endLocation.getLocation() - start_pc - 1;
+
+                check("local variable table entry start PC", start_pc);
+
+                dout.writeShort(start_pc);
+                dout.writeShort(length);
+                dout.writeShort(name_index);
+                dout.writeShort(descriptor_index);
+                dout.writeShort(index);
+            }
+        }
+    }
+
+    private void check(String type, int addr) throws RuntimeException {
+        if (addr < 0 || addr > 65535) {
+            throw new RuntimeException("Value for " + type + " out of " +
+                                       "valid range: " + addr);
+        }
+    }
+
+    private void clean() {
+        if (mCleanEntries != null) {
+            return;
+        }
+
+        // Clean out entries that are incomplete or bogus.
+
+        int size = mEntries.size();
+        mCleanEntries = new ArrayList(size);
+        mRangeCount = 0;
+
+    outer:
+        for (int i=0; i<size; i++) {
+            Entry entry = (Entry)mEntries.get(i);
+            LocalVariable localVar = entry.mLocalVar;
+
+            SortedSet ranges = localVar.getLocationRangeSet();
+            if (ranges == null || ranges.size() == 0) {
+                continue;
+            }
+
+            Iterator it = ranges.iterator();
+            while (it.hasNext()) {
+                LocationRange range = (LocationRange)it.next();
+
+                Location startLocation = range.getStartLocation();
+                Location endLocation = range.getEndLocation();
+
+                if (startLocation == null || endLocation == null) {
+                    continue outer;
+                }
+
+                int start_pc = startLocation.getLocation();
+                int length = endLocation.getLocation() - start_pc - 1;
+
+                if (length < 0) {
+                    continue outer;
+                }
+            }
+            
+            mCleanEntries.add(entry);
+            mRangeCount += entry.getRangeCount();
+        }
+    }
+
+    static Attribute define(ConstantPool cp,
+                            String name,
+                            int length,
+                            DataInput din) throws IOException {
+
+        LocalVariableTableAttr locals = new LocalVariableTableAttr(cp);
+
+        int size = din.readUnsignedShort();
+        for (int i=0; i<size; i++) {
+            int start_pc = din.readUnsignedShort();
+            int end_pc = start_pc + din.readUnsignedShort() + 1;
+            int name_index = din.readUnsignedShort();
+            int descriptor_index = din.readUnsignedShort();
+            final int index = din.readUnsignedShort();
+
+            final ConstantUTFInfo varName = 
+                (ConstantUTFInfo)cp.getConstant(name_index);
+            final ConstantUTFInfo varDesc = 
+                (ConstantUTFInfo)cp.getConstant(descriptor_index);
+
+            final Location startLocation = new FixedLocation(start_pc);
+            final Location endLocation = new FixedLocation(end_pc);
+
+            SortedSet ranges = new TreeSet();
+            ranges.add(new LocationRangeImpl(startLocation, endLocation));
+            final SortedSet fRanges =
+                Collections.unmodifiableSortedSet(ranges);
+
+            LocalVariable localVar = new LocalVariable() {
+                private String mName;
+                private TypeDescriptor mType;
+
+                {
+                    mName = varName.getValue();
+                    mType = TypeDescriptor.parseTypeDesc(varDesc.getValue());
+                }
+
+                public String getName() {
+                    return mName;
+                }
+
+                public void setName(String name) {
+                    mName = name;
+                }
+
+                public TypeDescriptor getType() {
+                    return mType;
+                }
+                
+                public boolean isDoubleWord() {
+                    Class clazz = mType.getClassArg();
+                    return (clazz == double.class || clazz == long.class);
+                }
+                
+                public int getNumber() {
+                    return index;
+                }
+
+                public SortedSet getLocationRangeSet() {
+                    return fRanges;
+                }
+            };
+
+            Entry entry = new Entry(localVar, varName, varDesc);
+            locals.mEntries.add(entry);
+        }
+
+        return locals;
+    }
+
+    private static class Entry {
+        public LocalVariable mLocalVar;
+        public ConstantUTFInfo mName;
+        public ConstantUTFInfo mDescriptor;
+
+        public Entry(LocalVariable localVar,
+                     ConstantUTFInfo name, ConstantUTFInfo descriptor) {
+
+            mLocalVar = localVar;
+            mName = name;
+            mDescriptor = descriptor;
+        }
+
+        public int getRangeCount() {
+            return mLocalVar.getLocationRangeSet().size();
+        }
+    }
+}