src/main/java/org/apache/maven/plugins/pmd/CpdViolationCheckMojo.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.maven.plugins.pmd;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.annotations.Execute;
import org.apache.maven.plugins.annotations.LifecyclePhase;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.plugins.pmd.model.CpdErrorDetail;
import org.apache.maven.plugins.pmd.model.CpdFile;
import org.apache.maven.plugins.pmd.model.Duplication;
import org.apache.maven.plugins.pmd.model.io.xpp3.CpdXpp3Reader;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;

/**
 * Fails the build if there were any CPD violations in the source code.
 *
 * @version $Id$
 * @since 2.0
 */
@Mojo(name = "cpd-check", defaultPhase = LifecyclePhase.VERIFY, threadSafe = true)
@Execute(goal = "cpd")
public class CpdViolationCheckMojo extends AbstractPmdViolationCheckMojo<Duplication> {
    /**
     * Default constructor. Initializes with the correct {@link ExcludeDuplicationsFromFile}.
     */
    public CpdViolationCheckMojo() {
        super(new ExcludeDuplicationsFromFile());
    }

    /**
     * Skip the CPD violation checks. Most useful on the command line via "-Dcpd.skip=true".
     */
    @Parameter(property = "cpd.skip", defaultValue = "false")
    private boolean skip;

    /**
     * Whether to fail the build if the validation check fails.
     *
     * @since 3.0
     */
    @Parameter(property = "cpd.failOnViolation", defaultValue = "true", required = true)
    protected boolean failOnViolation;

    /**
     * {@inheritDoc}
     */
    public void execute() throws MojoExecutionException, MojoFailureException {
        if (skip) {
            getLog().info("Skipping CPD execution");
            return;
        }

        executeCheck("cpd.xml", "duplication", "CPD duplication", 10);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void printError(Duplication item, String severity) {
        int lines = item.getLines();

        StringBuilder buff = new StringBuilder(100);
        buff.append("CPD ").append(severity).append(": Found ");
        buff.append(lines).append(" lines of duplicated code at locations:");
        this.getLog().info(buff.toString());

        for (CpdFile file : item.getFiles()) {
            buff.setLength(0);
            buff.append("    ");
            buff.append(file.getPath());
            buff.append(" line ").append(file.getLine());
            this.getLog().info(buff.toString());
        }

        this.getLog().debug("CPD " + severity + ": Code Fragment ");
        this.getLog().debug(item.getCodefragment());
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected List<Duplication> getErrorDetails(File cpdFile) throws XmlPullParserException, IOException {
        try (InputStream in = new FileInputStream(cpdFile)) {
            CpdXpp3Reader reader = new CpdXpp3Reader();
            CpdErrorDetail details = reader.read(in, false);
            return details.getDuplications();
        }
    }

    @Override
    protected int getPriority(Duplication errorDetail) {
        return 0;
    }

    @Override
    protected ViolationDetails<Duplication> newViolationDetailsInstance() {
        return new ViolationDetails<>();
    }

    @Override
    public boolean isFailOnViolation() {
        return failOnViolation;
    }
}