--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/com/go/trove/classfile/ExceptionHandler.java	Sat Mar 21 11:00:06 2009 +0000
@@ -0,0 +1,178 @@
+/* ====================================================================
+ * 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.io.*;
+
+/******************************************************************************
+ * This class corresponds to the exception_table structure as defined in
+ * section 4.7.4 of <i>The Java Virtual Machine Specification</i>.
+ *
+ * @author Brian S O'Neill
+ * @version
+ * <!--$$Revision: 1.1 $-->, <!--$$JustDate:-->  9/07/00 <!-- $-->
+ */
+public class ExceptionHandler implements LocationRange {
+    private Location mStart;
+    private Location mEnd;
+    private Location mCatch;
+    private ConstantClassInfo mCatchType;
+    
+    /**
+     * @param startLocation
+     * @param endLocation
+     * @param catchLocation
+     * @param catchType if null, then catch every object.
+     */
+    public ExceptionHandler(Location startLocation,
+                            Location endLocation,
+                            Location catchLocation,
+                            ConstantClassInfo catchType) {
+        mStart = startLocation;
+        mEnd = endLocation;
+        mCatch = catchLocation;
+        mCatchType = catchType;
+    }
+    
+    public Location getStartLocation() {
+        return mStart;
+    }
+    
+    public Location getEndLocation() {
+        return mEnd;
+    }
+    
+    public Location getCatchLocation() {
+        return mCatch;
+    }
+    
+    /**
+     * Returns null if every object is caught by this handler.
+     */
+    public ConstantClassInfo getCatchType() {
+        return mCatchType;
+    }
+
+    public int compareTo(Object obj) {
+        if (this == obj) {
+            return 0;
+        }
+
+        LocationRange other = (LocationRange)obj;
+
+        int result = getStartLocation().compareTo(other.getStartLocation());
+
+        if (result == 0) {
+            result = getEndLocation().compareTo(other.getEndLocation());
+        }
+
+        if (result == 0 && obj instanceof ExceptionHandler) {
+            result = getCatchLocation().compareTo
+                (((ExceptionHandler)other).getCatchLocation());
+        }
+
+        return result;
+    }
+    
+    public void writeTo(DataOutput dout) throws IOException {
+        int start_pc = getStartLocation().getLocation();
+        int end_pc = getEndLocation().getLocation();
+        int handler_pc = getCatchLocation().getLocation();
+        int catch_type;
+        ConstantClassInfo catchType = getCatchType();
+        if (catchType == null) {
+            catch_type = 0;
+        }
+        else {
+            catch_type = catchType.getIndex();
+        }
+
+        check("exception start PC", start_pc);
+        check("exception end PC", end_pc);
+        check("exception handler PC", handler_pc);
+
+        dout.writeShort(start_pc);
+        dout.writeShort(end_pc);
+        dout.writeShort(handler_pc);
+        dout.writeShort(catch_type);
+    }
+
+    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);
+
+        }
+    }
+
+    static ExceptionHandler readFrom(ConstantPool cp,
+                                     DataInput din) throws IOException {
+        int start_pc = din.readUnsignedShort();
+        int end_pc = din.readUnsignedShort();
+        int handler_pc = din.readUnsignedShort();
+        int catch_type = din.readUnsignedShort();
+
+        ConstantClassInfo catchTypeConstant;
+        if (catch_type == 0) {
+            catchTypeConstant = null;
+        }
+        else {
+            catchTypeConstant = (ConstantClassInfo)cp.getConstant(catch_type);
+        }
+
+        return new ExceptionHandler(new FixedLocation(start_pc),
+                                    new FixedLocation(end_pc),
+                                    new FixedLocation(handler_pc),
+                                    catchTypeConstant);
+    }
+}