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Apache Ant integration for PMD.
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/*
 * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
 */

package net.sourceforge.pmd.ant;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.FileSet;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.types.Reference;

import net.sourceforge.pmd.ant.internal.PMDTaskImpl;
import net.sourceforge.pmd.lang.rule.RulePriority;

/**
 * PMD Ant task. Setters of this class are interpreted by Ant as properties
 * settable in the XML. This is therefore published API.
 *
 * Runs PMD analysis via ant. The ant task looks like this:
 *
 * {@code
 *   
 *     
 *         
 *             
 *         
 *     
 *     
 *
 *     
 *       
 *         rulesets/java/quickstart.xml
 *         config/my-ruleset.xml
 *         
 *             
 *         
 *       
 *     
 *   
 * }
 *
 * Required: rulesetfiles/ruleset, fileset
 */
public class PMDTask extends Task {

    private Path classpath;
    private Path auxClasspath;
    private final List formatters = new ArrayList<>();
    private final List filesets = new ArrayList<>();
    private boolean failOnError;
    private boolean failOnRuleViolation;
    private final List relativizePathsWith = new ArrayList<>();
    private String suppressMarker;
    private String rulesetFiles;
    private String encoding;
    private int threads = 1; // same default as in PMDParameters (CLI)
    private int minimumPriority = RulePriority.LOW.getPriority(); // inclusive
    private int maxRuleViolations = 0;
    private String failuresPropertyName;
    private SourceLanguage sourceLanguage;
    private String cacheLocation;
    private boolean noCache;
    private final Collection nestedRules = new ArrayList<>();

    @Override
    public void execute() throws BuildException {
        validate();

        ClassLoader oldClassloader = Thread.currentThread().getContextClassLoader();
        Thread.currentThread().setContextClassLoader(PMDTask.class.getClassLoader());
        try {
            PMDTaskImpl mirror = new PMDTaskImpl(this);
            mirror.execute();
        } catch (Exception e) {
            throw new BuildException(e);
        } finally {
            Thread.currentThread().setContextClassLoader(oldClassloader);
        }
    }

    private void validate() throws BuildException {
        if (formatters.isEmpty()) {
            Formatter defaultFormatter = new Formatter();
            defaultFormatter.setType("text");
            defaultFormatter.setToConsole(true);
            formatters.add(defaultFormatter);
        } else {
            for (Formatter f : formatters) {
                if (f.isNoOutputSupplied()) {
                    throw new BuildException("toFile or toConsole needs to be specified in Formatter");
                }
            }
        }

        if (rulesetFiles == null) {
            if (nestedRules.isEmpty()) {
                throw new BuildException("No rulesets specified");
            }
            rulesetFiles = getNestedRuleSetFiles();
        }
    }

    private String getNestedRuleSetFiles() {
        final StringBuilder sb = new StringBuilder();
        for (Iterator it = nestedRules.iterator(); it.hasNext();) {
            RuleSetWrapper rs = it.next();
            sb.append(rs.getFile());
            if (it.hasNext()) {
                sb.append(',');
            }
        }
        return sb.toString();
    }

    public void setSuppressMarker(String suppressMarker) {
        this.suppressMarker = suppressMarker;
    }

    public void setFailOnError(boolean fail) {
        this.failOnError = fail;
    }

    public void setFailOnRuleViolation(boolean fail) {
        this.failOnRuleViolation = fail;
    }

    public void setMaxRuleViolations(int max) {
        if (max >= 0) {
            this.maxRuleViolations = max;
            this.failOnRuleViolation = true;
        }
    }

    public void setRuleSetFiles(String ruleSets) {
        this.rulesetFiles = ruleSets;
    }

    public void setEncoding(String sourceEncoding) {
        this.encoding = sourceEncoding;
    }

    public void setThreads(int threads) {
        this.threads = threads;
    }

    public void setFailuresPropertyName(String failuresPropertyName) {
        this.failuresPropertyName = failuresPropertyName;
    }

    public void setMinimumPriority(int minPriority) {
        this.minimumPriority = minPriority;
    }

    public void addFileset(FileSet set) {
        filesets.add(set);
    }

    public void addFormatter(Formatter f) {
        formatters.add(f);
    }

    public void addConfiguredSourceLanguage(SourceLanguage version) {
        this.sourceLanguage = version;
    }

    public void setClasspath(Path classpath) {
        this.classpath = classpath;
    }

    public Path getClasspath() {
        return classpath;
    }

    public Path createClasspath() {
        if (classpath == null) {
            classpath = new Path(getProject());
        }
        return classpath.createPath();
    }

    public void setClasspathRef(Reference r) {
        createClasspath().setRefid(r);
    }

    public void setAuxClasspath(Path auxClasspath) {
        this.auxClasspath = auxClasspath;
    }

    public Path getAuxClasspath() {
        return auxClasspath;
    }

    public Path createAuxClasspath() {
        if (auxClasspath == null) {
            auxClasspath = new Path(getProject());
        }
        return auxClasspath.createPath();
    }

    public void setAuxClasspathRef(Reference r) {
        createAuxClasspath().setRefid(r);
    }

    public void addRuleset(RuleSetWrapper r) {
        nestedRules.add(r);
    }

    public List getFormatters() {
        return formatters;
    }

    public List getFilesets() {
        return filesets;
    }

    public boolean isFailOnError() {
        return failOnError;
    }

    public boolean isFailOnRuleViolation() {
        return failOnRuleViolation;
    }

    public String getSuppressMarker() {
        return suppressMarker;
    }

    public String getRulesetFiles() {
        return rulesetFiles;
    }

    public String getEncoding() {
        return encoding;
    }

    public int getThreads() {
        return threads;
    }

    public int getMinimumPriority() {
        return minimumPriority;
    }

    public int getMaxRuleViolations() {
        return maxRuleViolations;
    }

    public String getFailuresPropertyName() {
        return failuresPropertyName;
    }

    public SourceLanguage getSourceLanguage() {
        return sourceLanguage;
    }

    public Collection getNestedRules() {
        return nestedRules;
    }

    public String getCacheLocation() {
        return cacheLocation;
    }

    public void setCacheLocation(String cacheLocation) {
        this.cacheLocation = cacheLocation;
    }


    public boolean isNoCache() {
        return noCache;
    }

    public void setNoCache(boolean noCache) {
        this.noCache = noCache;
    }

    public void addRelativizePathsWith(Path relativizePathsWith) {
        this.relativizePathsWith.add(relativizePathsWith);
    }

    public List getRelativizePathsWith() {
        return relativizePathsWith;
    }
}