org.codehaus.mojo.groovy.tools.ProvidersMojo Maven / Gradle / Ivy

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Provides support for execution, compilation and other facets of Groovy development.
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/*
 * Copyright (C) 2006-2007 the original author or authors.
 *
 * Licensed 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.codehaus.mojo.groovy.tools;

import java.net.URL;
import java.net.URLClassLoader;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;

import org.codehaus.mojo.groovy.ProviderMojoSupport;
import org.codehaus.mojo.groovy.feature.Feature;
import org.codehaus.mojo.groovy.feature.Provider;
import org.codehaus.mojo.groovy.feature.ProviderManager;
import org.codehaus.mojo.groovy.feature.ProviderRegistry;
import org.codehaus.mojo.groovy.feature.ProviderSelector;

/**
 * Displays information about the Groovy runtime providers which are configured and selected.
 *
 * @goal providers
 * @requiresProject false
 * @since 1.0-beta-3
 *
 * @author Jason Dillon
 * @version $Id: ProvidersMojo.java 5524 2007-10-25 07:29:37Z user57 $
 */
public class ProvidersMojo
    extends ProviderMojoSupport
{
    protected void doExecute() throws Exception {
        // logEnvironment();

        ProviderManager manager = getProviderManager();
        log.debug("Provider manager: {}", manager);

        ProviderRegistry registry = manager.getRegistry();
        log.debug("Provider registry: {}", registry);

        ProviderSelector selector = manager.getSelector();
        log.debug("Provider selector: {}", selector);

        // Before we can get the list of registered providers, we need to select one first,
        // so pick the default and save any failure for later inspection

        Provider selected = null;
        Throwable selectFailure = null;
        try {
            selected = provider();
            log.debug("Selected: {}", selected);
        }
        catch (Throwable t) {
            log.debug("Selection failure: " + t, t);
            selectFailure = t;
        }

        log.info("");

        log.info("Provider selection: {}", getProviderSelection());
        log.info("");
        
        Map providers = registry.providers();
        if (providers == null || providers.isEmpty()) {
            log.info("No providers registered");
        }
        else {
            log.info("Found {} registered providers:", String.valueOf(providers.size()));

            for (Iterator iter = providers.keySet().iterator(); iter.hasNext();) {
                String key = (String) iter.next();
                Provider provider = (Provider) providers.get(key);

                logProvider(provider, "    ");

                log.info("");
            }

            if (selected != null) {
                log.info("Selected provider:");
                log.info("    {}", selected);
            }
            else if (selectFailure != null) {
                log.info("No provider was selected; Failures occured while selecting: {}", selectFailure.toString());
            }
            else {
                log.info("No provider was selected and no failure was detected; The gods must be crazy...");
            }
        }

        log.info("");
    }

    protected void logEnvironment() {
        URL[] urls = ((URLClassLoader)getClass().getClassLoader()).getURLs();

        log.debug("ClassLoader Class-Path:");

        for (int i=0; i