com.github.maven_nar.NarProperties.java Source code

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Here is the source code for com.github.maven_nar.NarProperties.java

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/*
 * #%L
 * Native ARchive plugin for Maven
 * %%
 * Copyright (C) 2002 - 2014 NAR Maven Plugin developers.
 * %%
 * 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.
 * #L%
 */
package com.github.maven_nar;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import java.util.Enumeration;
import java.util.LinkedHashSet;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.util.PropertyUtils;

public class NarProperties {

    private final static String AOL_PROPERTIES = "aol.properties";
    private final static String CUSTOM_AOL_PROPERTY_KEY = "nar.aolProperties";
    private static NarProperties instance;

    /**
     * Retrieve the NarProperties
     * 
     * @param project
     *          may be null
     * @return
     * @throws MojoFailureException
     */
    public static NarProperties getInstance(final MavenProject project) throws MojoFailureException {
        if (instance == null) {
            instance = new NarProperties(project);
        }
        return instance;
    }

    /**
     * Programmatically inject properties (and possibly overwrite existing
     * properties)
     * 
     * @param project
     *          the current maven project
     * @param properties
     *          the properties from input stream
     */
    public static void inject(final MavenProject project, final InputStream properties)
            throws MojoFailureException {
        final Properties defaults = PropertyUtils.loadProperties(properties);
        final NarProperties nar = getInstance(project);
        nar.properties.putAll(defaults);
    }

    private final Properties properties;

    private NarProperties(final MavenProject project) throws MojoFailureException {

        final Properties defaults = PropertyUtils.loadProperties(NarUtil.class.getResourceAsStream(AOL_PROPERTIES));
        if (defaults == null) {
            throw new MojoFailureException(
                    "NAR: Could not load default properties file: '" + AOL_PROPERTIES + "'.");
        }

        this.properties = new Properties(defaults);
        FileInputStream fis = null;
        String customPropertyLocation = null;
        try {
            if (project != null) {
                customPropertyLocation = project.getProperties().getProperty(CUSTOM_AOL_PROPERTY_KEY);
                if (customPropertyLocation == null) {
                    // Try and read from the system property in case it's specified there
                    customPropertyLocation = System.getProperties().getProperty(CUSTOM_AOL_PROPERTY_KEY);
                }
                fis = new FileInputStream(customPropertyLocation != null ? customPropertyLocation
                        : project.getBasedir() + File.separator + AOL_PROPERTIES);
                this.properties.load(fis);
            }
        } catch (final FileNotFoundException e) {
            if (customPropertyLocation != null) {
                // We tried loading from a custom location - so throw the exception
                throw new MojoFailureException(
                        "NAR: Could not load custom properties file: '" + customPropertyLocation + "'.");
            }
        } catch (final IOException e) {
            // ignore (FIXME)
        } finally {
            try {
                if (fis != null) {
                    fis.close();
                }
            } catch (final IOException e) {
                // ignore
            }
        }

    }

    public Collection<String> getKnownAOLs() {
        final Collection<String> result = new LinkedHashSet<String>();
        final Pattern pattern = Pattern.compile("([^.]+)\\.([^.]+)\\.([^.]+).*");
        final Enumeration<?> e = this.properties.propertyNames();
        while (e.hasMoreElements()) {
            final Object key = e.nextElement();
            if (key instanceof String) {
                final Matcher matcher = pattern.matcher((String) key);
                if (matcher.matches()) {
                    result.add(matcher.group(1) + "-" + matcher.group(2) + "-" + matcher.group(3));
                }
            }
        }
        return result;
    }

    public String getProperty(final String key) {
        return this.properties.getProperty(key);
    }
}