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jeremybenn |
/* ScannerState.java
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.beans.encoder;
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import java.util.HashMap;
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/** <p>Provides the infrastructure for the state machine and the transition
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* mechanism.</p>
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*
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* <p>Each states knows a set of successor. There can be one successor for
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* every transition variant. Furthermore a state knows about a default
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* successor which is taken when there is no special setup for a
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* transition.</p>
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*
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* @author Robert Schuster (robertschuster@fsfe.org)
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*
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*/
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public abstract class ScannerState
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{
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static final int TRANSITION_METHOD_INVOCATION = 0;
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static final int TRANSITION_STATIC_METHOD_INVOCATION = 1;
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static final int TRANSITION_STATIC_FIELD_ACCESS = 2;
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static final int TRANSITION_CLASS_RESOLUTION = 3;
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static final int TRANSITION_OBJECT_INSTANTIATION = 4;
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static final int TRANSITION_PRIMITIVE_INSTANTIATION = 5;
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static final int TRANSITION_OBJECT_ARRAY_INSTANTIATION = 6;
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static final int TRANSITION_PRIMITIVE_ARRAY_INSTANTIATION = 7;
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static final int TRANSITION_ARRAY_SET = 8;
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static final int TRANSITION_ARRAY_GET = 9;
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static final int TRANSITION_LIST_SET = 10;
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static final int TRANSITION_LIST_GET = 11;
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static final int TRANSITION_NULL_OBJECT = 12;
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static final int TRANSITION_STRING_REFERENCE = 13;
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static final int TRANSITION_OBJECT_REFERENCE = 14;
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static final int TRANSITION_FIRST = 0;
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static final int TRANSITION_LAST = 14;
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static final String DEFAULT_STATE_NAME = "default";
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String defaultSuccessor = DEFAULT_STATE_NAME;
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static String[] transitionNames = { "METHOD_INVOCATION", "STATIC_METHOD_INVOCATION",
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"STATIC_FIELD_ACCESS", "CLASS_RESOLUTION",
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"OBJECT_INSTANTIATION",
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"PRIMITIVE_INSTANTIATION", "OBJECT_ARRAY_INSTANTIATION",
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"PRIMITIVE_ARRAY_INSTANTIATION",
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"ARRAY_SET", "ARRAY_GET", "LIST_SET", "LIST_GET",
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"NULL_OBJECT", "STRING_REFERENCE", "OBJECT_REFERENCE" };
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/**
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* Stores the transition setup as the relation
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* transition->successor's state name.
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*/
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HashMap transitions = new HashMap();
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int calls;
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Context context;
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String name;
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final void init(String newName)
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{
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assert (name == null);
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name = newName;
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}
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final String getName()
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{
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return name;
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}
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final void enter(Context ctx)
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{
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calls++;
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context = ctx;
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enterImpl(ctx);
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}
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protected void enterImpl(Context ctx)
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{
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}
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final Context context()
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{
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return context;
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}
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final int getCalls()
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{
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return calls;
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}
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/**
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* <p>Stores a successor's state name for a certain transition.</p>
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*
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* <p>This method is only used at the configuration time of the state
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* machine.</p>
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*
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* @param transition One of the transition constants.
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* @param stateName The state name of the successor.
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*/
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final void putSuccessor(int transition, String stateName)
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{
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assert (transition >= TRANSITION_FIRST && transition <= TRANSITION_LAST) :
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"Transition identifier '" + transition + "' is unknown.";
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transitions.put(new Integer(transition), stateName);
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}
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/** <p>Retrieves a the state name of a successor for the given transition
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* constant.</p>
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*
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* <p>Returns the default successor's state name if no special setup was
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* prepared.</p>
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*
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* @param transition One of the transition constants.
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* @return The state name of the successor.
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*/
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final String getSuccessor(int transition)
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{
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String state = (String) transitions.get(new Integer(transition));
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return (state == null) ? defaultSuccessor : state;
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}
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/**
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* Sets the name for the default successor state.
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*
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* @param newDefaultSuccessor The default successor's state name.
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*/
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final void setDefaultSuccessor(String newDefaultSuccessor)
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{
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defaultSuccessor = newDefaultSuccessor;
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}
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abstract void methodInvocation(String methodName);
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abstract void staticMethodInvocation(String className, String methodName);
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abstract void staticFieldAccess(String className, String fieldName);
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abstract void classResolution(String className);
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abstract void objectInstantiation(String className, ObjectId objectId);
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abstract void primitiveInstantiation(String primitiveName,
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String valueAsString);
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abstract void objectArrayInstantiation(String arrayClassName, String lengthAsString, ObjectId objectId);
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abstract void primitiveArrayInstantiation(String arrayClassName, String lengthAsString, ObjectId objectId);
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abstract void arraySet(String indexAsString);
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abstract void arrayGet(String indexAsString);
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abstract void listGet();
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abstract void listSet();
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abstract void nullObject();
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abstract void stringReference(String string);
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abstract void objectReference(ObjectId id);
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/**
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* <p>A special event that does not provoke a direct transition.</p>
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*
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* <p>Instead the transition is done by the <code>ScanEngine</code>: It goes
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* back to the previous state and just uses this method to inform the state
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* about this happening.</p>
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*/
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abstract void end();
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void enter()
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{
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}
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}
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