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Thorntail: Meta SPI

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/**
 * Copyright 2015-2017 Red Hat, Inc, and individual contributors.
 *
 * 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.wildfly.swarm.spi.meta;

import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import java.util.HashSet;

import org.jboss.shrinkwrap.descriptor.api.Descriptors;
import org.jboss.shrinkwrap.descriptor.api.webapp31.WebAppDescriptor;
import org.jboss.shrinkwrap.descriptor.api.webcommon31.ServletType;

/**
 * @author Ken Finnigan
 */
public abstract class WebXmlFractionDetector implements FractionDetector {

    @Override
    public String extensionToDetect() {
        return "xml";
    }

    @Override
    public boolean detectionComplete() {
        return detectionComplete;
    }

    @Override
    public boolean wasDetected() {
        return detected;
    }

    @Override
    public void detect(PathSource element) {
        if (!detectionComplete() && element != null) {
            try (InputStream input = element.getInputStream()) {
                webXMl = Descriptors.importAs(WebAppDescriptor.class)
                        .fromStream(input);
            } catch (IOException e) {
            }

            if (webXMl != null && doDetect()) {
                    detected = true;
                    detectionComplete = true;
                }
            }
    }

    public void hasServlet(String servletClass) {
        this.servletClasses.add(servletClass);
    }

    protected boolean doDetect() {
        long servletsFound =
                this.webXMl.getAllServlet()
                        .stream()
                        .map(ServletType::getServletClass)
                        .filter(c -> servletClasses.contains(c))
                        .count();

        if (servletsFound > 0) {
            return true;
        }
        return false;
    }

    private boolean detected = false;

    private boolean detectionComplete = false;

    private Collection servletClasses = new HashSet<>();

    protected WebAppDescriptor webXMl;
}