/*

 * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * This source code is provided to illustrate the usage of a given feature

 * or technique and has been deliberately simplified. Additional steps

 * required for a production-quality application, such as security checks,

 * input validation and proper error handling, might not be present in

 * this sample code.

 */

package com.sun.tools.example.debug.gui;

import java.io.*;

import java.util.*;

import com.sun.jdi.*;

import com.sun.tools.example.debug.event.*;

/**

 * Manage the list of source files.

 * Origin of SourceListener events.

 */

public class SourceManager {

    //### TODO: The source cache should be aged, and some cap

    //### put on memory consumption by source files loaded into core.

    private List<SourceModel> sourceList;

    private SearchPath sourcePath;

    private ArrayList<SourceListener> sourceListeners = new ArrayList<SourceListener>();

    private Map<ReferenceType, SourceModel> classToSource = new HashMap<ReferenceType, SourceModel>();

    private Environment env;

    /**

     * Hold on to it so it can be removed.

     */

    private SMClassListener classListener = new SMClassListener();

    public SourceManager(Environment env) {

        this(env, new SearchPath(""));

    }

    public SourceManager(Environment env, SearchPath sourcePath) {

        this.env = env;

        this.sourceList = new LinkedList<SourceModel>();

        this.sourcePath = sourcePath;

        env.getExecutionManager().addJDIListener(classListener);

    }

    /**

     * Set path for access to source code.

     */

    public void setSourcePath(SearchPath sp) {

        sourcePath = sp;

        // Old cached sources are now invalid.

        sourceList = new LinkedList<SourceModel>();

        notifySourcepathChanged();

        classToSource = new HashMap<ReferenceType, SourceModel>();

    }

    public void addSourceListener(SourceListener l) {

        sourceListeners.add(l);

    }

    public void removeSourceListener(SourceListener l) {

        sourceListeners.remove(l);

    }

    private void notifySourcepathChanged() {

        ArrayList<SourceListener> l = new ArrayList<SourceListener>(sourceListeners);

        SourcepathChangedEvent evt = new SourcepathChangedEvent(this);

        for (int i = 0; i < l.size(); i++) {

            l.get(i).sourcepathChanged(evt);

        }

    }

    /**

     * Get path for access to source code.

     */

    public SearchPath getSourcePath() {

        return sourcePath;

    }

    /**

     * Get source object associated with a Location.

     */

    public SourceModel sourceForLocation(Location loc) {

        return sourceForClass(loc.declaringType());

    }

    /**

     * Get source object associated with a class or interface.

     * Returns null if not available.

     */

    public SourceModel sourceForClass(ReferenceType refType) {

        SourceModel sm = classToSource.get(refType);

        if (sm != null) {

            return sm;

        }

        try {

            String filename = refType.sourceName();

            String refName = refType.name();

            int iDot = refName.lastIndexOf('.');

            String pkgName = (iDot >= 0)? refName.substring(0, iDot+1) : "";

            String full = pkgName.replace('.', File.separatorChar) + filename;

            File path = sourcePath.resolve(full);

            if (path != null) {

                sm = sourceForFile(path);

                classToSource.put(refType, sm);

                return sm;

            }

            return null;

        } catch (AbsentInformationException e) {

            return null;

        }

    }

    /**

     * Get source object associated with an absolute file path.

     */

    //### Use hash table for this?

    public SourceModel sourceForFile(File path) {

        Iterator<SourceModel> iter = sourceList.iterator();

        SourceModel sm = null;

        while (iter.hasNext()) {

            SourceModel candidate = iter.next();

            if (candidate.fileName().equals(path)) {

                sm = candidate;

                iter.remove();    // Will move to start of list.

                break;

            }

        }

        if (sm == null && path.exists()) {

            sm = new SourceModel(env, path);

        }

        if (sm != null) {

            // At start of list for faster access

            sourceList.add(0, sm);

        }

        return sm;

    }

    private class SMClassListener extends JDIAdapter

                                   implements JDIListener {

        @Override

        public void classPrepare(ClassPrepareEventSet e) {

            ReferenceType refType = e.getReferenceType();

            SourceModel sm = sourceForClass(refType);

            if (sm != null) {

                sm.addClass(refType);

            }

        }

        @Override

        public void classUnload(ClassUnloadEventSet e) {

            //### iterate through looking for (e.getTypeName()).

            //### then remove it.

        }

    }

}