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+/* ValueFactory.java -- factory to create JDWP Values
+ Copyright (C) 2007 Free Software Foundation
+
+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 gnu.classpath.jdwp.value;
+
+import gnu.classpath.jdwp.JdwpConstants;
+import gnu.classpath.jdwp.VMIdManager;
+import gnu.classpath.jdwp.exception.InvalidClassException;
+import gnu.classpath.jdwp.exception.InvalidObjectException;
+import gnu.classpath.jdwp.exception.InvalidTagException;
+import gnu.classpath.jdwp.exception.JdwpInternalErrorException;
+import gnu.classpath.jdwp.id.ObjectId;
+import gnu.classpath.jdwp.util.JdwpString;
+
+import java.nio.ByteBuffer;
+
+/**
+ * A factory to create JDWP Values.
+ *
+ * @author Kyle Galloway <kgallowa@redhat.com>
+ */
+public class ValueFactory
+{
+ /**
+ * Creates a new Value of appropriate type for the value in the ByteBuffer
+ * by reading the tag byte from the front of the buffer.
+ *
+ * @param bb contains the Object
+ * @return A new Value of appropriate type
+ * @throws JdwpInternalErrorException
+ * @throws InvalidObjectException
+ */
+ public static Value createFromTagged(ByteBuffer bb)
+ throws JdwpInternalErrorException, InvalidObjectException, InvalidTagException
+ {
+ return create(bb, bb.get());
+ }
+
+ /**
+ * Creates a new Value of appropriate type for the value in the ByteBuffer
+ * by checking the type of the Class passed in.
+ *
+ * @param bb contains the Object
+ * @param type a Class representing the type of the value in the ByteBuffer
+ * @return A new Value of appropriate type
+ * @throws JdwpInternalErrorException
+ * @throws InvalidObjectException
+ */
+ public static Value createFromUntagged(ByteBuffer bb, Class type)
+ throws JdwpInternalErrorException, InvalidObjectException, InvalidClassException
+ {
+ byte tag = getTagForClass(type);
+
+ try
+ {
+ return create(bb, tag);
+ }
+ catch (InvalidTagException ite)
+ {
+ throw new InvalidClassException(ite);
+ }
+ }
+
+ /**
+ * Creates a new Value of appropriate type for the value in the ByteBuffer.
+ *
+ * @param bb contains the Object
+ * @param tag a byte representing the type of the object
+ * @return A new Value of appropriate type
+ * @throws JdwpInternalErrorException
+ * @throws InvalidObjectException
+ */
+ private static Value create(ByteBuffer bb, byte tag)
+ throws JdwpInternalErrorException, InvalidObjectException, InvalidTagException
+ {
+ Value val = null;
+ switch(tag)
+ {
+ case JdwpConstants.Tag.BYTE:
+ val = new ByteValue(bb.get());
+ break;
+ case JdwpConstants.Tag.BOOLEAN:
+ val = new BooleanValue((bb.get() != 0));
+ break;
+ case JdwpConstants.Tag.CHAR:
+ val = new CharValue(bb.getChar());
+ break;
+ case JdwpConstants.Tag.SHORT:
+ val = new ShortValue(bb.getShort());
+ break;
+ case JdwpConstants.Tag.INT:
+ val = new IntValue(bb.getInt());
+ break;
+ case JdwpConstants.Tag.FLOAT:
+ val = new FloatValue(bb.getFloat());
+ break;
+ case JdwpConstants.Tag.LONG:
+ val = new LongValue(bb.getLong());
+ break;
+ case JdwpConstants.Tag.DOUBLE:
+ val = new DoubleValue(bb.getDouble());
+ break;
+ case JdwpConstants.Tag.VOID:
+ val = new VoidValue();
+ break;
+ case JdwpConstants.Tag.ARRAY:
+ case JdwpConstants.Tag.THREAD:
+ case JdwpConstants.Tag.OBJECT:
+ case JdwpConstants.Tag.THREAD_GROUP:
+ case JdwpConstants.Tag.CLASS_LOADER:
+ case JdwpConstants.Tag.CLASS_OBJECT:
+ ObjectId oid = VMIdManager.getDefault().readObjectId(bb);
+ val = new ObjectValue(oid.getObject());
+ break;
+ case JdwpConstants.Tag.STRING:
+ val = new StringValue(JdwpString.readString(bb));
+ break;
+ default:
+ throw new InvalidTagException(tag);
+ }
+
+ return val;
+ }
+
+ /**
+ * Creates a tag for the type of the class.
+ *
+ * @param klass the type to get a tag for
+ * @return a byte tag representing the class
+ * @throws JdwpInternalErrorException
+ * @throws InvalidObjectException
+ */
+ private static byte getTagForClass(Class klass)
+ throws JdwpInternalErrorException
+ {
+ byte tag;
+
+ if (klass.isPrimitive())
+ {
+ if (klass == byte.class)
+ tag = JdwpConstants.Tag.BYTE;
+ else if (klass == boolean.class)
+ tag = JdwpConstants.Tag.BOOLEAN;
+ else if (klass == char.class)
+ tag = JdwpConstants.Tag.CHAR;
+ else if (klass == short.class)
+ tag = JdwpConstants.Tag.SHORT;
+ else if (klass == int.class)
+ tag = JdwpConstants.Tag.INT;
+ else if (klass == float.class)
+ tag = JdwpConstants.Tag.FLOAT;
+ else if (klass == long.class)
+ tag = JdwpConstants.Tag.LONG;
+ else if (klass == double.class)
+ tag = JdwpConstants.Tag.DOUBLE;
+ else if (klass == void.class)
+ tag = JdwpConstants.Tag.VOID;
+ else
+ throw new JdwpInternalErrorException("Invalid primitive class");
+ }
+ else
+ {
+ tag = JdwpConstants.Tag.OBJECT;
+ }
+
+ return tag;
+ }
+
+ /**
+ * Create a value type for an Object of type determined by a Class. This is
+ * a special case where a value needs to be created, but the value to create
+ * it for is already in an object, not in a buffer.
+ *
+ * @param value the Object to convert to a Value
+ * @param type the Class type of the object
+ * @return a new Value representing this object
+ */
+ public static Value createFromObject(Object value, Class type)
+ {
+ Value val = null;
+
+ if (type.isPrimitive())
+ {
+ if (type == byte.class)
+ val = new ByteValue(((Byte) value).byteValue());
+ else if (type == boolean.class)
+ val = new BooleanValue(((Boolean) value).booleanValue());
+ else if (type == char.class)
+ val = new CharValue(((Character) value).charValue());
+ else if (type == short.class)
+ val = new ShortValue(((Short) value).shortValue());
+ else if (type == int.class)
+ val = new IntValue(((Integer) value).intValue());
+ else if (type == float.class)
+ val = new FloatValue(((Float) value).floatValue());
+ else if (type == long.class)
+ val = new LongValue(((Long) value).longValue());
+ else if (type == double.class)
+ val = new DoubleValue(((Double) value).doubleValue());
+ else if (type == void.class)
+ val = new VoidValue();
+ }
+ else
+ {
+ if (type.isAssignableFrom(String.class))
+ val = new StringValue ((String) value);
+ else
+ val = new ObjectValue(value);
+ }
+
+ return val;
+ }
+}