org.jboss.modules.AbstractResourceLoader Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.jboss.modules;
import java.io.IOException;
import java.net.URL;
import java.util.Collection;
import java.util.Collections;
import java.util.jar.Attributes;
import java.util.jar.Manifest;
/**
* An abstract resource loader implementation.
*
* @author Carlo de Wolf
* @author Richard Opalka
*/
public abstract class AbstractResourceLoader implements ResourceLoader {
/**
* Construct a new instance.
*/
protected AbstractResourceLoader() {
}
private static String getDefinedAttribute(Attributes.Name name, Attributes entryAttribute, Attributes mainAttribute) {
final String value = entryAttribute == null ? null : entryAttribute.getValue(name);
return value == null ? mainAttribute == null ? null : mainAttribute.getValue(name) : value;
}
/**
* Convenience method to get a package specification from a {@code Manifest}.
*
* @param name the (dot-separated) package name
* @param manifest the {@code Manifest} instance
* @param rootUrl the code source URL
* @return the package specification
*/
protected static PackageSpec getPackageSpec(final String name, final Manifest manifest, final URL rootUrl) {
final PackageSpec spec = new PackageSpec();
if (manifest == null) {
return null;
}
final Attributes mainAttribute = manifest.getMainAttributes();
final String path = name.replace('.', '/').concat("/");
final Attributes entryAttribute = manifest.getAttributes(path);
spec.setSpecTitle(getDefinedAttribute(Attributes.Name.SPECIFICATION_TITLE, entryAttribute, mainAttribute));
spec.setSpecVersion(getDefinedAttribute(Attributes.Name.SPECIFICATION_VERSION, entryAttribute, mainAttribute));
spec.setSpecVendor(getDefinedAttribute(Attributes.Name.SPECIFICATION_VENDOR, entryAttribute, mainAttribute));
spec.setImplTitle(getDefinedAttribute(Attributes.Name.IMPLEMENTATION_TITLE, entryAttribute, mainAttribute));
spec.setImplVersion(getDefinedAttribute(Attributes.Name.IMPLEMENTATION_VERSION, entryAttribute, mainAttribute));
spec.setImplVendor(getDefinedAttribute(Attributes.Name.IMPLEMENTATION_VENDOR, entryAttribute, mainAttribute));
if (Boolean.parseBoolean(getDefinedAttribute(Attributes.Name.SEALED, entryAttribute, mainAttribute))) {
spec.setSealBase(rootUrl);
}
return spec;
}
public String getRootName() {
return "";
}
public ClassSpec getClassSpec(final String fileName) throws IOException {
return null;
}
public PackageSpec getPackageSpec(final String name) throws IOException {
return null;
}
public Resource getResource(final String name) {
return null;
}
public String getLibrary(final String name) {
return null;
}
public Collection getPaths() {
return Collections.emptySet();
}
}