com.github.ferstl.depgraph.dependency.AggregatingGraphFactory.java Source code

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Here is the source code for com.github.ferstl.depgraph.dependency.AggregatingGraphFactory.java

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/*
 * Copyright (c) 2014 - 2016 by Stefan Ferstl <st.ferstl@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.ferstl.depgraph.dependency;

import java.util.Collection;
import java.util.List;
import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
import org.apache.maven.project.MavenProject;
import com.github.ferstl.depgraph.graph.GraphBuilder;

/**
 * A graph factory that creates a dependency graph from a multi-module project. Child modules are treated as
 * dependencies of the parent project. The created graph is the <strong>union</strong> of the child modules' dependency
 * graphs.
 */
public class AggregatingGraphFactory implements GraphFactory {

    private final MavenGraphAdapter mavenGraphAdapter;
    private final ArtifactFilter globalFilter;
    private final GraphBuilder<DependencyNode> graphBuilder;
    private final boolean includeParentProjects;

    public AggregatingGraphFactory(MavenGraphAdapter mavenGraphAdapter, ArtifactFilter globalFilter,
            GraphBuilder<DependencyNode> graphBuilder, boolean includeParentProjects) {
        this.mavenGraphAdapter = mavenGraphAdapter;
        this.globalFilter = globalFilter;
        this.graphBuilder = graphBuilder;
        this.includeParentProjects = includeParentProjects;
    }

    @Override
    public String createGraph(MavenProject parent) {
        this.graphBuilder.graphName(parent.getArtifactId());

        if (this.includeParentProjects) {
            buildModuleTree(parent, this.graphBuilder);
        }

        List<MavenProject> collectedProjects = parent.getCollectedProjects();
        for (MavenProject collectedProject : collectedProjects) {
            // Process project only if its artifact is not filtered
            if (isPartOfGraph(collectedProject)) {
                this.mavenGraphAdapter.buildDependencyGraph(collectedProject, this.globalFilter, this.graphBuilder);
            }
        }

        // Add the project as single node if the graph is empty
        Artifact artifact = parent.getArtifact();
        if (this.graphBuilder.isEmpty() && this.globalFilter.include(artifact)) {
            this.graphBuilder.addNode(new DependencyNode(artifact));
        }

        return this.graphBuilder.toString();
    }

    private void buildModuleTree(MavenProject parentProject, GraphBuilder<DependencyNode> graphBuilder) {
        Collection<MavenProject> collectedProjects = parentProject.getCollectedProjects();
        for (MavenProject collectedProject : collectedProjects) {
            MavenProject child = collectedProject;
            MavenProject parent = collectedProject.getParent();

            while (parent != null) {
                DependencyNode parentNode = filterProject(parent);
                DependencyNode childNode = filterProject(child);

                graphBuilder.addEdge(parentNode, childNode);

                // Stop if we reached the original parent project!
                if (parent.equals(parentProject)) {
                    break;
                }

                child = parent;
                parent = parent.getParent();
            }
        }
    }

    private boolean isPartOfGraph(MavenProject project) {
        boolean isIncluded = this.globalFilter.include(project.getArtifact());
        // Project is not filtered and is a parent project
        if (isIncluded && project.getModules().size() > 0) {
            return this.includeParentProjects;
        }

        return isIncluded;
    }

    private DependencyNode filterProject(MavenProject project) {
        Artifact artifact = project.getArtifact();
        if (this.globalFilter.include(artifact)) {
            return new DependencyNode(artifact);
        }

        return null;
    }

}