com.bmuschko.gradle.tomcat.internal.utils.TomcatThreadContextClassLoader.groovy Maven / Gradle / Ivy

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/*
 * Copyright 2014 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 com.bmuschko.gradle.tomcat.internal.utils

class TomcatThreadContextClassLoader implements ThreadContextClassLoader {
    /**
     * {@inheritDoc}
     */
    @Override
    void withClasspath(Set tomcatClasspathFiles, Closure closure) {
        ClassLoader originalClassLoader = getClass().classLoader

        try {
            Thread.currentThread().contextClassLoader = createClassLoader(tomcatClasspathFiles)
            closure.resolveStrategy = Closure.DELEGATE_FIRST
            closure.delegate = this
            closure()
        }
        finally {
            Thread.currentThread().contextClassLoader = originalClassLoader
        }
    }

    /**
     * Creates the classloader with the given classpath files.
     *
     * @param classpathFiles Classpath files
     * @return URL classloader
     */
    private URLClassLoader createClassLoader(Set tomcatClasspathFiles) {
        new URLClassLoader(toURLArray(tomcatClasspathFiles), ClassLoader.systemClassLoader.parent)
    }

    /**
     * Creates URL array from a set of files.
     *
     * @param files Files
     * @return URL array
     */
    private URL[] toURLArray(Set files) {
        files.collect { file -> file.toURI().toURL() } as URL[]
    }
}