# RulesChecker.java

    /*******************************************************************************
     * Copyright (c) 2009, 2013 Mountainminds GmbH & Co. KG and Contributors
     * All rights reserved. This program and the accompanying materials
     * are made available under the terms of the Eclipse Public License v1.0
     * which accompanies this distribution, and is available at
     * http://www.eclipse.org/legal/epl-v10.html
     *
     * Contributors:
     *    Marc R. Hoffmann - initial API and implementation
     *
     *******************************************************************************/
    package org.jacoco.report.check;

    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.Collection;
    import java.util.List;

    import org.jacoco.core.analysis.IBundleCoverage;
    import org.jacoco.core.data.ExecutionData;
    import org.jacoco.core.data.SessionInfo;
    import org.jacoco.report.ILanguageNames;
    import org.jacoco.report.IReportGroupVisitor;
    import org.jacoco.report.IReportVisitor;
    import org.jacoco.report.ISourceFileLocator;
    import org.jacoco.report.JavaNames;

    /**
     * Formatter which checks a set of given rules and reports violations to a
     * {@link IViolationsOutput} instance.
     */
    public class RulesChecker {

    	private List<Rule> rules;
    	private ILanguageNames languageNames;

    	/**
    	 * New formatter instance.
    	 */
    	public RulesChecker() {
    		this.rules = new ArrayList<Rule>();
    		this.setLanguageNames(new JavaNames());
    	}

    	/**
    	 * Sets the rules to check by this formatter.
    	 *
    	 * @param rules
    	 *            rules to check
    	 */
    	public void setRules(final List<Rule> rules) {
    		this.rules = rules;
    	}

    	/**
    	 * Sets the implementation for language name display for message formatting.
    	 * Java language names are defined by default.
    	 *
    	 * @param languageNames
    	 *            converter for language specific names
    	 */
    	public void setLanguageNames(final ILanguageNames languageNames) {
    		this.languageNames = languageNames;
    	}

    	/**
    	 * Creates a new visitor to process the configured checks.
    	 *
    	 * @param output
    	 *            call-back to report violations to
    	 * @return visitor to emit the report data to
    	 */
    	public IReportVisitor createVisitor(final IViolationsOutput output) {
    		final BundleChecker bundleChecker = new BundleChecker(rules,
    				languageNames, output);
    		return new IReportVisitor() {

    			public IReportGroupVisitor visitGroup(final String name)
    					throws IOException {
    				return this;
    			}

    			public void visitBundle(final IBundleCoverage bundle,
    					final ISourceFileLocator locator) throws IOException {
    				bundleChecker.checkBundle(bundle);
    			}

    			public void visitInfo(final List<SessionInfo> sessionInfos,
    					final Collection<ExecutionData> executionData)
    					throws IOException {
    			}

    			public void visitEnd() throws IOException {
    			}
    		};
    	}

    }