org.jvnet.maven.plugin.antrun.GraphVisitors Maven / Gradle / Ivy

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This extended antrun maven plugin enables users not only to run ant scripts embedded in the POM, but also to reference maven dependencies using Ant task classes. This enables the user to delegate more complex tasks to Ant such as constructing file-based installation distros.

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package org.jvnet.maven.plugin.antrun;

import java.util.Arrays;
import java.util.Collection;

/**
 * Factories for {@link GraphVisitor}.
 *
 * @author Kohsuke Kawaguchi
 */
public class GraphVisitors {
    /**
     * Combines multiple {@link GraphVisitor} by AND-ing its output.
     * Can be used to create intersections.
     */
    public static GraphVisitor and(GraphVisitor... visitors) {
        return and(Arrays.asList(visitors));
    }

    /**
     * Combines multiple {@link GraphVisitor} by AND-ing its output.
     * Can be used to create intersections.
     */
    public static GraphVisitor and(final Collection visitors) {
        return new GraphVisitor() {
            public boolean visit(DependencyGraph.Edge edge) {
                for (GraphVisitor v : visitors) {
                    if(!v.visit(edge))
                        return false;
                }
                return true;
            }

            public boolean visit(DependencyGraph.Node node) {
                for (GraphVisitor v : visitors) {
                    if(!v.visit(node))
                        return false;
                }
                return true;
            }
        };
    }

    /**
     * Combines multiple {@link GraphVisitor} by OR-ing its output.
     * Can be used to create unions.
     */
    public static GraphVisitor or(GraphVisitor... visitors) {
        return or(Arrays.asList(visitors));
    }

    /**
     * Combines multiple {@link GraphVisitor} by OR-ing its output.
     * Can be used to create unions.
     */
    public static GraphVisitor or(final Collection visitors) {
        return new GraphVisitor() {
            public boolean visit(DependencyGraph.Edge edge) {
                for (GraphVisitor v : visitors) {
                    if(v.visit(edge))
                        return true;
                }
                return false;
            }

            public boolean visit(DependencyGraph.Node node) {
                for (GraphVisitor v : visitors) {
                    if(!v.visit(node))
                        return true;
                }
                return false;
            }
        };
    }

    /**
     * Obtains a {@link GraphVisitor} that does boolean-negation of the current {@link GraphVisitor}.
     */
    public static GraphVisitor not(final GraphVisitor graph) {
        return new GraphVisitor() {
            public boolean visit(DependencyGraph.Edge edge) {
                return !graph.visit(edge);
            }

            public boolean visit(DependencyGraph.Node node) {
                return !graph.visit(node);
            }
        };
    }
}