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Spice up your java: Automatic Resource Management, automatic generation of getters, setters, equals, hashCode and toString, and more!
/*
* Copyright (C) 2009-2013 The Project Lombok Authors.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.javac;
import static lombok.javac.JavacTreeMaker.TreeTag.treeTag;
import static lombok.javac.JavacTreeMaker.TypeTag.typeTag;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.lang.model.type.NoType;
import javax.lang.model.type.TypeKind;
import javax.lang.model.type.TypeVisitor;
import lombok.javac.JavacTreeMaker.TreeTag;
import lombok.javac.JavacTreeMaker.TypeTag;
import com.sun.tools.javac.code.Source;
import com.sun.tools.javac.code.Type;
import com.sun.tools.javac.main.JavaCompiler;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.JCClassDecl;
import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCFieldAccess;
import com.sun.tools.javac.tree.JCTree.JCIdent;
import com.sun.tools.javac.tree.JCTree.JCLiteral;
import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
/**
* Container for static utility methods relevant to lombok's operation on javac.
*/
public class Javac {
private Javac() {
// prevent instantiation
}
/** Matches any of the 8 primitive names, such as {@code boolean}. */
private static final Pattern PRIMITIVE_TYPE_NAME_PATTERN = Pattern.compile("^(boolean|byte|short|int|long|float|double|char)$");
private static final Pattern VERSION_PARSER = Pattern.compile("^(\\d{1,6})\\.(\\d{1,6}).*$");
private static final Pattern SOURCE_PARSER = Pattern.compile("^JDK(\\d{1,6})_(\\d{1,6}).*$");
private static final AtomicInteger compilerVersion = new AtomicInteger(-1);
/**
* Returns the version of this java compiler, i.e. the JDK that it shipped in. For example, for javac v1.7, this returns {@code 7}.
*/
public static int getJavaCompilerVersion() {
int cv = compilerVersion.get();
if (cv != -1) return cv;
/* Main algorithm: Use JavaCompiler's intended method to do this */ {
Matcher m = VERSION_PARSER.matcher(JavaCompiler.version());
if (m.matches()) {
int major = Integer.parseInt(m.group(1));
int minor = Integer.parseInt(m.group(2));
if (major == 1) {
compilerVersion.set(minor);
return minor;
}
}
}
/* Fallback algorithm one: Check Source's values. Lets hope oracle never releases a javac that recognizes future versions for -source */ {
String name = Source.values()[Source.values().length - 1].name();
Matcher m = SOURCE_PARSER.matcher(name);
if (m.matches()) {
int major = Integer.parseInt(m.group(1));
int minor = Integer.parseInt(m.group(2));
if (major == 1) {
compilerVersion.set(minor);
return minor;
}
}
}
compilerVersion.set(6);
return 6;
}
private static final Class DOCCOMMENTTABLE_CLASS;
static {
Class c = null;
try {
c = Class.forName("com.sun.tools.javac.tree.DocCommentTable");
} catch (Throwable ignore) {}
DOCCOMMENTTABLE_CLASS = c;
}
public static boolean instanceOfDocCommentTable(Object o) {
return DOCCOMMENTTABLE_CLASS != null && DOCCOMMENTTABLE_CLASS.isInstance(o);
}
/**
* Checks if the given expression (that really ought to refer to a type
* expression) represents a primitive type.
*/
public static boolean isPrimitive(JCExpression ref) {
String typeName = ref.toString();
return PRIMITIVE_TYPE_NAME_PATTERN.matcher(typeName).matches();
}
/**
* Turns an expression into a guessed intended literal. Only works for
* literals, as you can imagine.
*
* Will for example turn a TrueLiteral into 'Boolean.valueOf(true)'.
*/
public static Object calculateGuess(JCExpression expr) {
if (expr instanceof JCLiteral) {
JCLiteral lit = (JCLiteral) expr;
if (lit.getKind() == com.sun.source.tree.Tree.Kind.BOOLEAN_LITERAL) {
return ((Number) lit.value).intValue() == 0 ? false : true;
}
return lit.value;
} else if (expr instanceof JCIdent || expr instanceof JCFieldAccess) {
String x = expr.toString();
if (x.endsWith(".class")) x = x.substring(0, x.length() - 6);
else {
int idx = x.lastIndexOf('.');
if (idx > -1) x = x.substring(idx + 1);
}
return x;
} else
return null;
}
public static final TypeTag CTC_BOOLEAN = typeTag("BOOLEAN");
public static final TypeTag CTC_INT = typeTag("INT");
public static final TypeTag CTC_DOUBLE = typeTag("DOUBLE");
public static final TypeTag CTC_FLOAT = typeTag("FLOAT");
public static final TypeTag CTC_SHORT = typeTag("SHORT");
public static final TypeTag CTC_BYTE = typeTag("BYTE");
public static final TypeTag CTC_LONG = typeTag("LONG");
public static final TypeTag CTC_CHAR = typeTag("CHAR");
public static final TypeTag CTC_VOID = typeTag("VOID");
public static final TypeTag CTC_NONE = typeTag("NONE");
public static final TypeTag CTC_BOT = typeTag("BOT");
public static final TypeTag CTC_CLASS = typeTag("CLASS");
public static final TreeTag CTC_NOT_EQUAL = treeTag("NE");
public static final TreeTag CTC_POS = treeTag("POS");
public static final TreeTag CTC_NEG = treeTag("NEG");
public static final TreeTag CTC_NOT = treeTag("NOT");
public static final TreeTag CTC_COMPL = treeTag("COMPL");
public static final TreeTag CTC_BITXOR = treeTag("BITXOR");
public static final TreeTag CTC_UNSIGNED_SHIFT_RIGHT = treeTag("USR");
public static final TreeTag CTC_MUL = treeTag("MUL");
public static final TreeTag CTC_PLUS = treeTag("PLUS");
public static final TreeTag CTC_EQUAL = treeTag("EQ");
public static final TreeTag CTC_PREINC = treeTag("PREINC");
public static final TreeTag CTC_PREDEC = treeTag("PREDEC");
private static final Method getExtendsClause, getEndPosition, storeEnd;
static {
getExtendsClause = getMethod(JCClassDecl.class, "getExtendsClause", new Class[0]);
getExtendsClause.setAccessible(true);
if (getJavaCompilerVersion() < 8) {
getEndPosition = getMethod(DiagnosticPosition.class, "getEndPosition", java.util.Map.class);
storeEnd = getMethod(java.util.Map.class, "put", Object.class, Object.class);
} else {
getEndPosition = getMethod(DiagnosticPosition.class, "getEndPosition", "com.sun.tools.javac.tree.EndPosTable");
Method storeEndMethodTemp;
Class endPosTable;
try {
endPosTable = Class.forName("com.sun.tools.javac.tree.EndPosTable");
} catch (ClassNotFoundException ex) {
throw sneakyThrow(ex);
}
try {
storeEndMethodTemp = endPosTable.getMethod("storeEnd", JCTree.class, int.class);
} catch (NoSuchMethodException e) {
try {
endPosTable = Class.forName("com.sun.tools.javac.parser.JavacParser$AbstractEndPosTable");
storeEndMethodTemp = endPosTable.getDeclaredMethod("storeEnd", JCTree.class, int.class);
} catch (NoSuchMethodException ex) {
throw sneakyThrow(ex);
} catch (ClassNotFoundException ex) {
throw sneakyThrow(ex);
}
}
storeEnd = storeEndMethodTemp;
}
getEndPosition.setAccessible(true);
storeEnd.setAccessible(true);
}
private static Method getMethod(Class clazz, String name, Class... paramTypes) {
try {
return clazz.getMethod(name, paramTypes);
} catch (NoSuchMethodException e) {
throw sneakyThrow(e);
}
}
private static Method getMethod(Class clazz, String name, String... paramTypes) {
try {
Class[] c = new Class[paramTypes.length];
for (int i = 0; i < paramTypes.length; i++) c[i] = Class.forName(paramTypes[i]);
return clazz.getMethod(name, c);
} catch (NoSuchMethodException e) {
throw sneakyThrow(e);
} catch (ClassNotFoundException e) {
throw sneakyThrow(e);
}
}
public static JCTree getExtendsClause(JCClassDecl decl) {
try {
return (JCTree) getExtendsClause.invoke(decl);
} catch (IllegalAccessException e) {
throw sneakyThrow(e);
} catch (InvocationTargetException e) {
throw sneakyThrow(e.getCause());
}
}
public static Object getDocComments(JCCompilationUnit cu) {
try {
return JCCOMPILATIONUNIT_DOCCOMMENTS.get(cu);
} catch (IllegalAccessException e) {
throw sneakyThrow(e);
}
}
public static void initDocComments(JCCompilationUnit cu) {
try {
JCCOMPILATIONUNIT_DOCCOMMENTS.set(cu, new HashMap());
} catch (IllegalArgumentException e) {
// That's fine - we're on JDK8, we'll fix that later.
} catch (IllegalAccessException e) {
throw sneakyThrow(e);
}
}
public static int getEndPosition(DiagnosticPosition pos, JCCompilationUnit top) {
try {
Object endPositions = JCCOMPILATIONUNIT_ENDPOSITIONS.get(top);
return (Integer) getEndPosition.invoke(pos, endPositions);
} catch (IllegalAccessException e) {
throw sneakyThrow(e);
} catch (InvocationTargetException e) {
throw sneakyThrow(e.getCause());
}
}
public static void storeEnd(JCTree tree, int pos, JCCompilationUnit top) {
try {
Object endPositions = JCCOMPILATIONUNIT_ENDPOSITIONS.get(top);
storeEnd.invoke(endPositions, tree, pos);
} catch (IllegalAccessException e) {
throw sneakyThrow(e);
} catch (InvocationTargetException e) {
throw sneakyThrow(e.getCause());
}
}
private static final Class JC_VOID_TYPE, JC_NO_TYPE;
static {
Class c = null;
try {
c = Class.forName("com.sun.tools.javac.code.Type$JCVoidType");
} catch (Throwable ignore) {}
JC_VOID_TYPE = c;
c = null;
try {
c = Class.forName("com.sun.tools.javac.code.Type$JCNoType");
} catch (Throwable ignore) {}
JC_NO_TYPE = c;
}
public static Type createVoidType(JavacTreeMaker maker, TypeTag tag) {
if (Javac.getJavaCompilerVersion() < 8) {
return new JCNoType(((Integer) tag.value).intValue());
} else {
try {
if (CTC_VOID.equals(tag)) {
return (Type) JC_VOID_TYPE.newInstance();
} else {
return (Type) JC_NO_TYPE.newInstance();
}
} catch (IllegalAccessException e) {
throw sneakyThrow(e);
} catch (InstantiationException e) {
throw sneakyThrow(e);
}
}
}
private static class JCNoType extends Type implements NoType {
public JCNoType(int tag) {
super(tag, null);
}
@Override
public TypeKind getKind() {
if (tag == ((Integer) CTC_VOID.value).intValue()) return TypeKind.VOID;
if (tag == ((Integer) CTC_NONE.value).intValue()) return TypeKind.NONE;
throw new AssertionError("Unexpected tag: " + tag);
}
@Override
public R accept(TypeVisitor v, P p) {
return v.visitNoType(this, p);
}
}
private static final Field JCCOMPILATIONUNIT_ENDPOSITIONS, JCCOMPILATIONUNIT_DOCCOMMENTS;
static {
Field f = null;
try {
f = JCCompilationUnit.class.getDeclaredField("endPositions");
} catch (NoSuchFieldException e) {}
JCCOMPILATIONUNIT_ENDPOSITIONS = f;
f = null;
try {
f = JCCompilationUnit.class.getDeclaredField("docComments");
} catch (NoSuchFieldException e) {}
JCCOMPILATIONUNIT_DOCCOMMENTS = f;
}
static RuntimeException sneakyThrow(Throwable t) {
if (t == null) throw new NullPointerException("t");
Javac.sneakyThrow0(t);
return null;
}
@SuppressWarnings("unchecked")
private static void sneakyThrow0(Throwable t) throws T {
throw (T)t;
}
}
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