/*

 * Copyright (c) 2012, 2014, 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

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 */

package com.sun.tools.sjavac;

import java.io.File;

import java.util.HashMap;

import java.util.HashSet;

import java.util.Map;

import java.util.Set;

import com.sun.tools.javac.util.Assert;

/**

 * The build state class captures the source code and generated artifacts

 * from a build. There are usually two build states, the previous one (prev),

 * loaded from the javac_state file, and the current one (now).

 *

 *  <p><b>This is NOT part of any supported API.

 *  If you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 */

public class BuildState {

    private Map<String,Module> modules = new HashMap<>();

    private Map<String,Package> packages = new HashMap<>();

    private Map<String,Source> sources = new HashMap<>();

    private Map<String,File> artifacts = new HashMap<>();

    // Map from package to a set of packages that depend on said package.

    private Map<String,Set<String>> dependents = new HashMap<>();

    public  Map<String,Module> modules() { return modules; }

    public  Map<String,Package> packages() { return packages; }

    public  Map<String,Source> sources() { return sources; }

    public  Map<String,File> artifacts() { return artifacts; }

    public  Map<String,Set<String>> dependents() { return dependents; }

    /**

     * Lookup a module from a name. Create the module if it does

     * not exist yet.

     */

    public Module lookupModule(String mod) {

        Module m = modules.get(mod);

        if (m == null) {

            m = new Module(mod, "???");

            modules.put(mod, m);

        }

        return m;

    }

    /**

     * Find a module from a given package name. For example:

     * The package name "base:java.lang" will fetch the module named "base".

     * The package name ":java.net" will fetch the default module.

     */

    Module findModuleFromPackageName(String pkg) {

        int cp = pkg.indexOf(':');

        Assert.check(cp != -1);

        String mod = pkg.substring(0, cp);

        return lookupModule(mod);

    }

    /**

     * Store references to all packages, sources and artifacts for all modules

     * into the build state. I.e. flatten the module tree structure

     * into global maps stored in the BuildState for easy access.

     *

     * @param m The set of modules.

     */

    public void flattenPackagesSourcesAndArtifacts(Map<String,Module> m) {

        modules = m;

        // Extract all the found packages.

        for (Module i : modules.values()) {

            for (Map.Entry<String,Package> j : i.packages().entrySet()) {

                Package p = packages.get(j.getKey());

                // Check that no two different packages are stored under same name.

                Assert.check(p == null || p == j.getValue());

                if (p == null) {

                    p = j.getValue();

                    packages.put(j.getKey(),j.getValue());

                }

                for (Map.Entry<String,Source> k : p.sources().entrySet()) {

                    Source s = sources.get(k.getKey());

                    // Check that no two different sources are stored under same name.

                    Assert.check(s == null || s == k.getValue());

                    if (s == null) {

                        s = k.getValue();

                        sources.put(k.getKey(), k.getValue());

                    }

                }

                for (Map.Entry<String,File> g : p.artifacts().entrySet()) {

                    File f = artifacts.get(g.getKey());

                    // Check that no two artifacts are stored under the same file.

                    Assert.check(f == null || f == g.getValue());

                    if (f == null) {

                        f = g.getValue();

                        artifacts.put(g.getKey(), g.getValue());

                    }

                }

            }

        }

    }

    /**

     * Store references to all artifacts found in the module tree into the maps

     * stored in the build state.

     *

     * @param m The set of modules.

     */

    public void flattenArtifacts(Map<String,Module> m) {

        modules = m;

        // Extract all the found packages.

        for (Module i : modules.values()) {

            for (Map.Entry<String,Package> j : i.packages().entrySet()) {

                Package p = packages.get(j.getKey());

                // Check that no two different packages are stored under same name.

                Assert.check(p == null || p == j.getValue());

                p = j.getValue();

                packages.put(j.getKey(),j.getValue());

                for (Map.Entry<String,File> g : p.artifacts().entrySet()) {

                    File f = artifacts.get(g.getKey());

                    // Check that no two artifacts are stored under the same file.

                    Assert.check(f == null || f == g.getValue());

                    artifacts.put(g.getKey(), g.getValue());

                }

            }

        }

    }

    /**

     * Calculate the package dependents (ie the reverse of the dependencies).

     */

    public void calculateDependents() {

        dependents = new HashMap<>();

        for (String s : packages.keySet()) {

            Package p = packages.get(s);

            for (String d : p.dependencies()) {

                Set<String> ss = dependents.get(d);

                if (ss == null) {

                    ss = new HashSet<>();

                    dependents.put(d, ss);

                }

                // Add the dependent information to the global dependent map.

                ss.add(s);

                Package dp = packages.get(d);

                // Also add the dependent information to the package specific map.

                // Normally, you do not compile java.lang et al. Therefore

                // there are several packages that p depends upon that you

                // do not have in your state database. This is perfectly fine.

                if (dp != null) {

                    // But this package did exist in the state database.

                    dp.addDependent(p.name());

                }

            }

        }

    }

    /**

     * Verify that the setModules method above did the right thing when

     * running through the module->package->source structure.

     */

    public void checkInternalState(String msg, boolean linkedOnly, Map<String,Source> srcs) {

        boolean baad = false;

        Map<String,Source> original = new HashMap<>();

        Map<String,Source> calculated = new HashMap<>();

        for (String s : sources.keySet()) {

            Source ss = sources.get(s);

            if (ss.isLinkedOnly() == linkedOnly) {

                calculated.put(s,ss);

            }

        }

        for (String s : srcs.keySet()) {

            Source ss = srcs.get(s);

            if (ss.isLinkedOnly() == linkedOnly) {

                original.put(s,ss);

            }

        }

        if (original.size() != calculated.size()) {

            Log.error("INTERNAL ERROR "+msg+" original and calculated are not the same size!");

            baad = true;

        }

        if (!original.keySet().equals(calculated.keySet())) {

            Log.error("INTERNAL ERROR "+msg+" original and calculated do not have the same domain!");

            baad = true;

        }

        if (!baad) {

            for (String s : original.keySet()) {

                Source s1 = original.get(s);

                Source s2 = calculated.get(s);

                if (s1 == null || s2 == null || !s1.equals(s2)) {

                    Log.error("INTERNAL ERROR "+msg+" original and calculated have differing elements for "+s);

                }

                baad = true;

            }

        }

        if (baad) {

            for (String s : original.keySet()) {

                Source ss = original.get(s);

                Source sss = calculated.get(s);

                if (sss == null) {

                    Log.error("The file "+s+" does not exist in calculated tree of sources.");

                }

            }

            for (String s : calculated.keySet()) {

                Source ss = calculated.get(s);

                Source sss = original.get(s);

                if (sss == null) {

                    Log.error("The file "+s+" does not exist in original set of found sources.");

                }

            }

        }

    }

    /**

     * Load a module from the javac state file.

     */

    public Module loadModule(String l) {

        Module m = Module.load(l);

        modules.put(m.name(), m);

        return m;

    }

    /**

     * Load a package from the javac state file.

     */

    public Package loadPackage(Module lastModule, String l) {

        Package p = Package.load(lastModule, l);

        lastModule.addPackage(p);

        packages.put(p.name(), p);

        return p;

    }

    /**

     * Load a source from the javac state file.

     */

    public Source loadSource(Package lastPackage, String l, boolean is_generated) {

        Source s = Source.load(lastPackage, l, is_generated);

        lastPackage.addSource(s);

        sources.put(s.name(), s);

        return s;

    }

    /**

     * During an incremental compile we need to copy the old javac state

     * information about packages that were not recompiled.

     */

    public void copyPackagesExcept(BuildState prev, Set<String> recompiled, Set<String> removed) {

        for (String pkg : prev.packages().keySet()) {

            // Do not copy recompiled or removed packages.

            if (recompiled.contains(pkg) || removed.contains(pkg)) continue;

            Module mnew = findModuleFromPackageName(pkg);

            Package pprev = prev.packages().get(pkg);

            mnew.addPackage(pprev);

            // Do not forget to update the flattened data.

            packages.put(pkg, pprev);

        }

    }

}