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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
*
* 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 io.fd.hc2vpp.docs.core;
import static java.lang.String.format;
import io.fd.hc2vpp.docs.api.Operation;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import org.objectweb.asm.ClassReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Scans provided class for reference under specified crud method
*/
public class CoverageScanner {
private static final Logger LOG = LoggerFactory.getLogger(CoverageScanner.class);
private final Class<?> classToScan;
private final Operation.CrudOperation crudOperation;
private final Class<?> referenceClass;
public CoverageScanner(final Class<?> classToScan,
final Operation.CrudOperation crudOperation,
final Class<?> referenceClass) {
this.classToScan = classToScan;
this.crudOperation = crudOperation;
this.referenceClass = referenceClass;
}
static ClassReader loadClass(String className) {
try (InputStream classStream =
CoverageScanner.class.getClassLoader().getResourceAsStream(className + ".class")) {
return new ClassReader(classStream);
} catch (IOException e) {
throw new IllegalStateException(format("Unable to load bytecode for class %s", className), e);
}
}
public Set<PluginMethodReference> scan() {
LOG.debug("Scanning class {}", classToScan.getName());
final ClassReader classReader = loadClass(byteCodeStyleReference(classToScan.getName()));
final Set<PluginMethodReference> foundReferences = Collections.synchronizedSet(new HashSet<>());
classReader.accept(new MethodDelegatingClassVisitor(byteCodeStyleReference(classToScan.getName()),
crudOperation.getMethodReference(), byteCodeStyleReference(referenceClass.getPackage().getName()),
foundReferences, null), ClassReader.SKIP_DEBUG);
return foundReferences;
}
// converts java style reference to bytecode-style name(with slashes instead of dots)
private static String byteCodeStyleReference(final String javaStyleName) {
return javaStyleName.replace(".", "/");
}
}
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