enforcer-rules/src/main/java/org/apache/maven/plugins/enforcer/DefaultEnforcementRuleHelper.java

package org.apache.maven.plugins.enforcer;

/*
 * 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.
 */

import java.io.File;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Supplier;

import org.apache.maven.enforcer.rule.api.EnforcerRuleHelper;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.plugin.logging.Log;
import org.codehaus.plexus.PlexusContainer;
import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
import org.codehaus.plexus.component.repository.exception.ComponentLookupException;

/**
 * Default implementation of the EnforcementRuleHelper interface. This is used to help retrieve information from the
 * session and provide useful elements like the log.
 *
 * @author <a href="mailto:brianf@apache.org">Brian Fox</a>
 */
public class DefaultEnforcementRuleHelper
    implements EnforcerRuleHelper
{

    /** The log. */
    private Log log;

    /** The evaluator. */
    private ExpressionEvaluator evaluator;

    /** The container. */
    private PlexusContainer container;

    /** A cache. */
    private Map<String, Object> cache;

    /**
     * Instantiates a new default enforcement rule helper.
     *
     * @param session the session
     * @param evaluator the evaluator
     * @param log the log
     * @param container the container
     */
    public DefaultEnforcementRuleHelper( MavenSession session, ExpressionEvaluator evaluator, Log log,
                                         PlexusContainer container )
    {
        this.evaluator = evaluator;
        this.log = log;
        if ( container != null )
        {
            this.container = container;
        }
        else
        {
            this.container = session.getContainer();
        }

        this.cache = new HashMap<>();
    }

    @Override
    public Log getLog()
    {
        return log;
    }

    @Override
    public File alignToBaseDirectory( File theFile )
    {
        return evaluator.alignToBaseDirectory( theFile );
    }

    @Override
    public Object evaluate( String theExpression )
        throws ExpressionEvaluationException
    {
        return evaluator.evaluate( theExpression );
    }

    @Override
    public <T> T getComponent( Class<T> clazz )
        throws ComponentLookupException
    {
        return container.lookup( clazz );
    }

    @Override
    public Object getComponent( String theComponentKey )
        throws ComponentLookupException
    {
        return container.lookup( theComponentKey );
    }

    @Override
    public Object getComponent( String theRole, String theRoleHint )
        throws ComponentLookupException
    {
        return container.lookup( theRole, theRoleHint );
    }

    @Override
    public List<Object> getComponentList( String theRole )
        throws ComponentLookupException
    {
        return container.lookupList( theRole );
    }

    @Override
    public Map<String, Object> getComponentMap( String theRole )
        throws ComponentLookupException
    {
        return container.lookupMap( theRole );
    }
    
    @Override
    public <T> T getComponent( Class<T> clazz, String roleHint )
        throws ComponentLookupException
    {
        return container.lookup( clazz, roleHint );
    }

    @Override
    public PlexusContainer getContainer()
    {
        return container;
    }

    @Override
    public Object getCache( String key, Supplier<?> producer )
    {
        return cache.computeIfAbsent( key, ( x ) -> producer.get() );
    }
}