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223 lines (197 loc) · 7.55 KB
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/*
* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package com.sun.source.util;
import java.lang.reflect.Method;
import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.ErrorType;
import javax.lang.model.type.TypeMirror;
import javax.tools.Diagnostic;
import javax.tools.JavaCompiler.CompilationTask;
import com.sun.source.tree.CatchTree;
import com.sun.source.tree.ClassTree;
import com.sun.source.tree.CompilationUnitTree;
import com.sun.source.tree.MethodTree;
import com.sun.source.tree.Scope;
import com.sun.source.tree.Tree;
/**
* Bridges JSR 199, JSR 269, and the Tree API.
*
* @author Peter von der Ahé
*/
@jdk.Exported
public abstract class Trees {
/**
* Gets a Trees object for a given CompilationTask.
* @param task the compilation task for which to get the Trees object
* @throws IllegalArgumentException if the task does not support the Trees API.
*/
public static Trees instance(CompilationTask task) {
String taskClassName = task.getClass().getName();
if (!taskClassName.equals("com.sun.tools.javac.api.JavacTaskImpl")
&& !taskClassName.equals("com.sun.tools.javac.api.BasicJavacTask"))
throw new IllegalArgumentException();
return getJavacTrees(CompilationTask.class, task);
}
/**
* Gets a Trees object for a given ProcessingEnvironment.
* @param env the processing environment for which to get the Trees object
* @throws IllegalArgumentException if the env does not support the Trees API.
*/
public static Trees instance(ProcessingEnvironment env) {
if (!env.getClass().getName().equals("com.sun.tools.javac.processing.JavacProcessingEnvironment"))
throw new IllegalArgumentException();
return getJavacTrees(ProcessingEnvironment.class, env);
}
static Trees getJavacTrees(Class<?> argType, Object arg) {
try {
ClassLoader cl = arg.getClass().getClassLoader();
Class<?> c = Class.forName("com.sun.tools.javac.api.JavacTrees", false, cl);
argType = Class.forName(argType.getName(), false, cl);
Method m = c.getMethod("instance", new Class<?>[] { argType });
return (Trees) m.invoke(null, new Object[] { arg });
} catch (Throwable e) {
throw new AssertionError(e);
}
}
/**
* Gets a utility object for obtaining source positions.
*/
public abstract SourcePositions getSourcePositions();
/**
* Gets the Tree node for a given Element.
* Returns null if the node can not be found.
*/
public abstract Tree getTree(Element element);
/**
* Gets the ClassTree node for a given TypeElement.
* Returns null if the node can not be found.
*/
public abstract ClassTree getTree(TypeElement element);
/**
* Gets the MethodTree node for a given ExecutableElement.
* Returns null if the node can not be found.
*/
public abstract MethodTree getTree(ExecutableElement method);
/**
* Gets the Tree node for an AnnotationMirror on a given Element.
* Returns null if the node can not be found.
*/
public abstract Tree getTree(Element e, AnnotationMirror a);
/**
* Gets the Tree node for an AnnotationValue for an AnnotationMirror on a given Element.
* Returns null if the node can not be found.
*/
public abstract Tree getTree(Element e, AnnotationMirror a, AnnotationValue v);
/**
* Gets the path to tree node within the specified compilation unit.