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Implementation of mmm-code-api for Java.
/* Copyright (c) The m-m-m Team, Licensed under the Apache License, Version 2.0
* http://www.apache.org/licenses/LICENSE-2.0 */
package io.github.mmm.code.impl.java;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.lang.reflect.WildcardType;
import java.security.CodeSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import io.github.mmm.code.api.CodeName;
import io.github.mmm.code.api.element.CodeElementWithDeclaringType;
import io.github.mmm.code.api.element.CodeElementWithTypeVariables;
import io.github.mmm.code.api.node.CodeNode;
import io.github.mmm.code.api.type.CodeTypeVariable;
import io.github.mmm.code.base.AbstractBaseContextWithCache;
import io.github.mmm.code.base.BaseContext;
import io.github.mmm.code.base.arg.BaseOperationArg;
import io.github.mmm.code.base.element.BaseElement;
import io.github.mmm.code.base.element.BaseElementWithDeclaringType;
import io.github.mmm.code.base.loader.BaseLoader;
import io.github.mmm.code.base.member.BaseOperation;
import io.github.mmm.code.base.node.BaseNodeItem;
import io.github.mmm.code.base.source.BaseSource;
import io.github.mmm.code.base.source.BaseSourceImpl;
import io.github.mmm.code.base.source.BaseSourceProvider;
import io.github.mmm.code.base.type.BaseArrayType;
import io.github.mmm.code.base.type.BaseGenericType;
import io.github.mmm.code.base.type.BaseParameterizedType;
import io.github.mmm.code.base.type.BaseType;
import io.github.mmm.code.base.type.BaseTypeVariable;
import io.github.mmm.code.base.type.BaseTypeVariables;
import io.github.mmm.code.base.type.BaseTypeWildcard;
/**
* Implementation of {@link io.github.mmm.code.api.CodeContext} for Java.
*
* @author Joerg Hohwiller (hohwille at users.sourceforge.net)
* @since 1.0.0
*/
public abstract class JavaContext extends AbstractBaseContextWithCache {
private static final Logger LOG = LoggerFactory.getLogger(JavaContext.class);
/**
* The constructor.
*
* @param source the top-level {@link #getSource() source}.
*/
protected JavaContext(BaseSourceImpl source) {
super(source);
}
/**
* The constructor.
*
* @param source the top-level {@link #getSource() source}.
* @param sourceProvider the {@link BaseSourceProvider}.
*/
public JavaContext(BaseSourceImpl source, BaseSourceProvider sourceProvider) {
super(source, sourceProvider);
}
/**
* @return the root {@link JavaContext context} responsible for the fundamental code (from JDK).
*/
@Override
public abstract JavaRootContext getRootContext();
@Override
protected BaseType getTypeFromCache(String qualifiedName) { // make visible
return super.getTypeFromCache(qualifiedName);
}
@Override
public BaseGenericType getType(Type type, CodeElementWithDeclaringType declaringElement) {
if (type instanceof Class) {
return getType((Class) type);
} else if (type instanceof ParameterizedType) {
ParameterizedType parameterizedType = (ParameterizedType) type;
return new BaseParameterizedType((BaseElement) declaringElement, parameterizedType);
} else if (type instanceof TypeVariable) {
TypeVariable typeVar = (TypeVariable) type;
if (declaringElement instanceof BaseType) {
BaseType declaringType = (BaseType) declaringElement;
assert (typeVar.getGenericDeclaration() == declaringType.getReflectiveObject());
return new BaseTypeVariable(declaringType.getTypeParameters(), typeVar);
} else if (declaringElement instanceof BaseOperation) {
BaseOperation operation = (BaseOperation) declaringElement;
if (typeVar.getGenericDeclaration() == operation.getReflectiveObject()) {
return new BaseTypeVariable(operation.getTypeParameters(), typeVar);
}
}
BaseTypeVariable typeVariable = (BaseTypeVariable) findTypeVariable(declaringElement, typeVar.getName());
if (typeVariable != null) {
return typeVariable;
}
LOG.warn("Could not find type variable {} in {}", typeVar, declaringElement);
return new BaseTypeVariable((BaseTypeVariables) declaringElement.getDeclaringType().getTypeParameters(), typeVar);
} else if (type instanceof WildcardType) {
WildcardType wildcard = (WildcardType) type;
BaseNodeItem parent;
if (declaringElement instanceof BaseParameterizedType) {
parent = ((BaseParameterizedType) declaringElement).getTypeParameters();
} else {
parent = (BaseNodeItem) declaringElement;
}
return new BaseTypeWildcard(parent, wildcard);
} else if (type instanceof GenericArrayType) {
return new BaseArrayType((BaseElementWithDeclaringType) declaringElement, type);
} else {
throw new IllegalStateException(type.getClass().getSimpleName());
}
}
private static CodeTypeVariable findTypeVariable(CodeNode node, String name) {
CodeElementWithTypeVariables elementWithTypeVariables = findElementWithTypeVariables(node);
if (elementWithTypeVariables != null) {
return elementWithTypeVariables.getTypeParameters().get(name, true);
}
return null;
}
private static CodeElementWithTypeVariables findElementWithTypeVariables(CodeNode node) {
if (node instanceof CodeElementWithTypeVariables) {
return (CodeElementWithTypeVariables) node;
} else if (node instanceof BaseOperationArg) {
BaseOperationArg arg = (BaseOperationArg) node;
BaseOperation operation = arg.getDeclaringOperation();
if (operation != null) {
return operation;
} else {
return arg.getDeclaringType();
}
} else if (node instanceof BaseGenericType) {
return findElementWithTypeVariables(node.getParent());
} else if (node instanceof BaseTypeVariables) {
return findElementWithTypeVariables(node.getParent());
} else {
throw new IllegalStateException(node.getClass().getSimpleName());
}
}
/**
* @return the {@link ClassLoader} used by this context to load byte-code.
*/
public abstract ClassLoader getClassLoader();
/**
* Implementation of {@link BaseLoader} to load classes from byte-code.
*
* @see JavaContext#getLoader()
*/
protected class JavaClassLoader implements BaseLoader {
private final ClassLoader classLoader;
/**
* The constructor.
*/
public JavaClassLoader() {
this(Thread.currentThread().getContextClassLoader());
}
/**
* The constructor.
*
* @param classloader the explicit {@link ClassLoader} to use.
*/
public JavaClassLoader(ClassLoader classloader) {
super();
this.classLoader = classloader;
}
@Override
public BaseSource getSource() {
return JavaContext.this.getSource();
}
@Override
public BaseContext getContext() {
return JavaContext.this;
}
/**
* @return the {@link ClassLoader} used to load byte-code.
*/
public ClassLoader getClassLoader() {
return this.classLoader;
}
@Override
public BaseType getType(String qualifiedName) {
if (this.classLoader != null) {
Class clazz = null;
try {
clazz = this.classLoader.loadClass(qualifiedName);
if (clazz.isArray()) {
throw new IllegalArgumentException(qualifiedName);
}
return (BaseType) getContext().getType(clazz);
} catch (ClassNotFoundException | NoClassDefFoundError e) {
if (LOG.isTraceEnabled()) {
LOG.debug("Class {} not found.", qualifiedName, e);
} else {
LOG.debug("Class {} not found: {}", qualifiedName, e.toString());
}
}
}
BaseType type = getSource().getLoader().getType(parseName(qualifiedName));
if (type != null) {
// TODO make or create as system immutable to prevent eager init
type.setImmutable();
}
return type;
}
@Override
public BaseType getType(CodeName qualifiedName) {
return getType(qualifiedName.getFullName());
}
@Override
public BaseGenericType getType(Class clazz) {
if (clazz.isArray()) {
BaseGenericType componentType = getType(clazz.getComponentType());
return componentType.createArray();
}
CodeSource codeSource = clazz.getProtectionDomain().getCodeSource();
BaseSource source = getOrCreateSource(codeSource);
if (source == null) {
return null;
}
return source.getLoader().getType(clazz);
}
}
}
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