diff -r 000000000000 -r 5198affdb915 emul/mini/src/main/java/java/lang/reflect/Constructor.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/emul/mini/src/main/java/java/lang/reflect/Constructor.java Mon Jan 28 18:12:47 2013 +0100 @@ -0,0 +1,683 @@ +/* + * Copyright (c) 1996, 2010, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +package java.lang.reflect; + +import sun.reflect.ConstructorAccessor; +import sun.reflect.Reflection; +import sun.reflect.generics.repository.ConstructorRepository; +import sun.reflect.generics.factory.CoreReflectionFactory; +import sun.reflect.generics.factory.GenericsFactory; +import sun.reflect.generics.scope.ConstructorScope; +import java.lang.annotation.Annotation; +import java.util.Map; +import sun.reflect.annotation.AnnotationParser; +import java.lang.annotation.AnnotationFormatError; +import java.lang.reflect.Modifier; + +/** + * {@code Constructor} provides information about, and access to, a single + * constructor for a class. + * + *

{@code Constructor} permits widening conversions to occur when matching the + * actual parameters to newInstance() with the underlying + * constructor's formal parameters, but throws an + * {@code IllegalArgumentException} if a narrowing conversion would occur. + * + * @param the class in which the constructor is declared + * + * @see Member + * @see java.lang.Class + * @see java.lang.Class#getConstructors() + * @see java.lang.Class#getConstructor(Class[]) + * @see java.lang.Class#getDeclaredConstructors() + * + * @author Kenneth Russell + * @author Nakul Saraiya + */ +public final + class Constructor extends AccessibleObject implements + GenericDeclaration, + Member { + + private Class clazz; + private int slot; + private Class[] parameterTypes; + private Class[] exceptionTypes; + private int modifiers; + // Generics and annotations support + private transient String signature; + // generic info repository; lazily initialized + private transient ConstructorRepository genericInfo; + private byte[] annotations; + private byte[] parameterAnnotations; + + // Generics infrastructure + // Accessor for factory + private GenericsFactory getFactory() { + // create scope and factory + return CoreReflectionFactory.make(this, ConstructorScope.make(this)); + } + + // Accessor for generic info repository + private ConstructorRepository getGenericInfo() { + // lazily initialize repository if necessary + if (genericInfo == null) { + // create and cache generic info repository + genericInfo = + ConstructorRepository.make(getSignature(), + getFactory()); + } + return genericInfo; //return cached repository + } + + private volatile ConstructorAccessor constructorAccessor; + // For sharing of ConstructorAccessors. This branching structure + // is currently only two levels deep (i.e., one root Constructor + // and potentially many Constructor objects pointing to it.) + private Constructor root; + + /** + * Package-private constructor used by ReflectAccess to enable + * instantiation of these objects in Java code from the java.lang + * package via sun.reflect.LangReflectAccess. + */ + Constructor(Class declaringClass, + Class[] parameterTypes, + Class[] checkedExceptions, + int modifiers, + int slot, + String signature, + byte[] annotations, + byte[] parameterAnnotations) + { + this.clazz = declaringClass; + this.parameterTypes = parameterTypes; + this.exceptionTypes = checkedExceptions; + this.modifiers = modifiers; + this.slot = slot; + this.signature = signature; + this.annotations = annotations; + this.parameterAnnotations = parameterAnnotations; + } + + /** + * Package-private routine (exposed to java.lang.Class via + * ReflectAccess) which returns a copy of this Constructor. The copy's + * "root" field points to this Constructor. + */ + Constructor copy() { + // This routine enables sharing of ConstructorAccessor objects + // among Constructor objects which refer to the same underlying + // method in the VM. (All of this contortion is only necessary + // because of the "accessibility" bit in AccessibleObject, + // which implicitly requires that new java.lang.reflect + // objects be fabricated for each reflective call on Class + // objects.) + Constructor res = new Constructor<>(clazz, + parameterTypes, + exceptionTypes, modifiers, slot, + signature, + annotations, + parameterAnnotations); + res.root = this; + // Might as well eagerly propagate this if already present + res.constructorAccessor = constructorAccessor; + return res; + } + + /** + * Returns the {@code Class} object representing the class that declares + * the constructor represented by this {@code Constructor} object. + */ + public Class getDeclaringClass() { + return clazz; + } + + /** + * Returns the name of this constructor, as a string. This is + * the binary name of the constructor's declaring class. + */ + public String getName() { + return getDeclaringClass().getName(); + } + + /** + * Returns the Java language modifiers for the constructor + * represented by this {@code Constructor} object, as an integer. The + * {@code Modifier} class should be used to decode the modifiers. + * + * @see Modifier + */ + public int getModifiers() { + return modifiers; + } + + /** + * Returns an array of {@code TypeVariable} objects that represent the + * type variables declared by the generic declaration represented by this + * {@code GenericDeclaration} object, in declaration order. Returns an + * array of length 0 if the underlying generic declaration declares no type + * variables. + * + * @return an array of {@code TypeVariable} objects that represent + * the type variables declared by this generic declaration + * @throws GenericSignatureFormatError if the generic + * signature of this generic declaration does not conform to + * the format specified in + * The Java™ Virtual Machine Specification + * @since 1.5 + */ + public TypeVariable>[] getTypeParameters() { + if (getSignature() != null) { + return (TypeVariable>[])getGenericInfo().getTypeParameters(); + } else + return (TypeVariable>[])new TypeVariable[0]; + } + + + /** + * Returns an array of {@code Class} objects that represent the formal + * parameter types, in declaration order, of the constructor + * represented by this {@code Constructor} object. Returns an array of + * length 0 if the underlying constructor takes no parameters. + * + * @return the parameter types for the constructor this object + * represents + */ + public Class[] getParameterTypes() { + return (Class[]) parameterTypes.clone(); + } + + + /** + * Returns an array of {@code Type} objects that represent the formal + * parameter types, in declaration order, of the method represented by + * this {@code Constructor} object. Returns an array of length 0 if the + * underlying method takes no parameters. + * + *

If a formal parameter type is a parameterized type, + * the {@code Type} object returned for it must accurately reflect + * the actual type parameters used in the source code. + * + *

If a formal parameter type is a type variable or a parameterized + * type, it is created. Otherwise, it is resolved. + * + * @return an array of {@code Type}s that represent the formal + * parameter types of the underlying method, in declaration order + * @throws GenericSignatureFormatError + * if the generic method signature does not conform to the format + * specified in + * The Java™ Virtual Machine Specification + * @throws TypeNotPresentException if any of the parameter + * types of the underlying method refers to a non-existent type + * declaration + * @throws MalformedParameterizedTypeException if any of + * the underlying method's parameter types refer to a parameterized + * type that cannot be instantiated for any reason + * @since 1.5 + */ + public Type[] getGenericParameterTypes() { + if (getSignature() != null) + return getGenericInfo().getParameterTypes(); + else + return getParameterTypes(); + } + + + /** + * Returns an array of {@code Class} objects that represent the types + * of exceptions declared to be thrown by the underlying constructor + * represented by this {@code Constructor} object. Returns an array of + * length 0 if the constructor declares no exceptions in its {@code throws} clause. + * + * @return the exception types declared as being thrown by the + * constructor this object represents + */ + public Class[] getExceptionTypes() { + return (Class[])exceptionTypes.clone(); + } + + + /** + * Returns an array of {@code Type} objects that represent the + * exceptions declared to be thrown by this {@code Constructor} object. + * Returns an array of length 0 if the underlying method declares + * no exceptions in its {@code throws} clause. + * + *

If an exception type is a type variable or a parameterized + * type, it is created. Otherwise, it is resolved. + * + * @return an array of Types that represent the exception types + * thrown by the underlying method + * @throws GenericSignatureFormatError + * if the generic method signature does not conform to the format + * specified in + * The Java™ Virtual Machine Specification + * @throws TypeNotPresentException if the underlying method's + * {@code throws} clause refers to a non-existent type declaration + * @throws MalformedParameterizedTypeException if + * the underlying method's {@code throws} clause refers to a + * parameterized type that cannot be instantiated for any reason + * @since 1.5 + */ + public Type[] getGenericExceptionTypes() { + Type[] result; + if (getSignature() != null && + ( (result = getGenericInfo().getExceptionTypes()).length > 0 )) + return result; + else + return getExceptionTypes(); + } + + /** + * Compares this {@code Constructor} against the specified object. + * Returns true if the objects are the same. Two {@code Constructor} objects are + * the same if they were declared by the same class and have the + * same formal parameter types. + */ + public boolean equals(Object obj) { + if (obj != null && obj instanceof Constructor) { + Constructor other = (Constructor)obj; + if (getDeclaringClass() == other.getDeclaringClass()) { + /* Avoid unnecessary cloning */ + Class[] params1 = parameterTypes; + Class[] params2 = other.parameterTypes; + if (params1.length == params2.length) { + for (int i = 0; i < params1.length; i++) { + if (params1[i] != params2[i]) + return false; + } + return true; + } + } + } + return false; + } + + /** + * Returns a hashcode for this {@code Constructor}. The hashcode is + * the same as the hashcode for the underlying constructor's + * declaring class name. + */ + public int hashCode() { + return getDeclaringClass().getName().hashCode(); + } + + /** + * Returns a string describing this {@code Constructor}. The string is + * formatted as the constructor access modifiers, if any, + * followed by the fully-qualified name of the declaring class, + * followed by a parenthesized, comma-separated list of the + * constructor's formal parameter types. For example: + * 

+     *    public java.util.Hashtable(int,float)
+     *
+ * + *

The only possible modifiers for constructors are the access + * modifiers {@code public}, {@code protected} or + * {@code private}. Only one of these may appear, or none if the + * constructor has default (package) access. + */ + public String toString() { + try { + StringBuffer sb = new StringBuffer(); + int mod = getModifiers() & Modifier.constructorModifiers(); + if (mod != 0) { + sb.append(Modifier.toString(mod) + " "); + } + sb.append(Field.getTypeName(getDeclaringClass())); + sb.append("("); + Class[] params = parameterTypes; // avoid clone + for (int j = 0; j < params.length; j++) { + sb.append(Field.getTypeName(params[j])); + if (j < (params.length - 1)) + sb.append(","); + } + sb.append(")"); + Class[] exceptions = exceptionTypes; // avoid clone + if (exceptions.length > 0) { + sb.append(" throws "); + for (int k = 0; k < exceptions.length; k++) { + sb.append(exceptions[k].getName()); + if (k < (exceptions.length - 1)) + sb.append(","); + } + } + return sb.toString(); + } catch (Exception e) { + return "<" + e + ">"; + } + } + + /** + * Returns a string describing this {@code Constructor}, + * including type parameters. The string is formatted as the + * constructor access modifiers, if any, followed by an + * angle-bracketed comma separated list of the constructor's type + * parameters, if any, followed by the fully-qualified name of the + * declaring class, followed by a parenthesized, comma-separated + * list of the constructor's generic formal parameter types. + * + * If this constructor was declared to take a variable number of + * arguments, instead of denoting the last parameter as + * "Type[]", it is denoted as + * "Type...". + * + * A space is used to separate access modifiers from one another + * and from the type parameters or return type. If there are no + * type parameters, the type parameter list is elided; if the type + * parameter list is present, a space separates the list from the + * class name. If the constructor is declared to throw + * exceptions, the parameter list is followed by a space, followed + * by the word "{@code throws}" followed by a + * comma-separated list of the thrown exception types. + * + *

The only possible modifiers for constructors are the access + * modifiers {@code public}, {@code protected} or + * {@code private}. Only one of these may appear, or none if the + * constructor has default (package) access. + * + * @return a string describing this {@code Constructor}, + * include type parameters + * + * @since 1.5 + */ + public String toGenericString() { + try { + StringBuilder sb = new StringBuilder(); + int mod = getModifiers() & Modifier.constructorModifiers(); + if (mod != 0) { + sb.append(Modifier.toString(mod) + " "); + } + TypeVariable[] typeparms = getTypeParameters(); + if (typeparms.length > 0) { + boolean first = true; + sb.append("<"); + for(TypeVariable typeparm: typeparms) { + if (!first) + sb.append(","); + // Class objects can't occur here; no need to test + // and call Class.getName(). + sb.append(typeparm.toString()); + first = false; + } + sb.append("> "); + } + sb.append(Field.getTypeName(getDeclaringClass())); + sb.append("("); + Type[] params = getGenericParameterTypes(); + for (int j = 0; j < params.length; j++) { + String param = (params[j] instanceof Class)? + Field.getTypeName((Class)params[j]): + (params[j].toString()); + if (isVarArgs() && (j == params.length - 1)) // replace T[] with T... + param = param.replaceFirst("\\[\\]$", "..."); + sb.append(param); + if (j < (params.length - 1)) + sb.append(","); + } + sb.append(")"); + Type[] exceptions = getGenericExceptionTypes(); + if (exceptions.length > 0) { + sb.append(" throws "); + for (int k = 0; k < exceptions.length; k++) { + sb.append((exceptions[k] instanceof Class)? + ((Class)exceptions[k]).getName(): + exceptions[k].toString()); + if (k < (exceptions.length - 1)) + sb.append(","); + } + } + return sb.toString(); + } catch (Exception e) { + return "<" + e + ">"; + } + } + + /** + * Uses the constructor represented by this {@code Constructor} object to + * create and initialize a new instance of the constructor's + * declaring class, with the specified initialization parameters. + * Individual parameters are automatically unwrapped to match + * primitive formal parameters, and both primitive and reference + * parameters are subject to method invocation conversions as necessary. + * + *

If the number of formal parameters required by the underlying constructor + * is 0, the supplied {@code initargs} array may be of length 0 or null. + * + *

If the constructor's declaring class is an inner class in a + * non-static context, the first argument to the constructor needs + * to be the enclosing instance; see section 15.9.3 of + * The Java™ Language Specification. + * + *

If the required access and argument checks succeed and the + * instantiation will proceed, the constructor's declaring class + * is initialized if it has not already been initialized. + * + *

If the constructor completes normally, returns the newly + * created and initialized instance. + * + * @param initargs array of objects to be passed as arguments to + * the constructor call; values of primitive types are wrapped in + * a wrapper object of the appropriate type (e.g. a {@code float} + * in a {@link java.lang.Float Float}) + * + * @return a new object created by calling the constructor + * this object represents + * + * @exception IllegalAccessException if this {@code Constructor} object + * is enforcing Java language access control and the underlying + * constructor is inaccessible. + * @exception IllegalArgumentException if the number of actual + * and formal parameters differ; if an unwrapping + * conversion for primitive arguments fails; or if, + * after possible unwrapping, a parameter value + * cannot be converted to the corresponding formal + * parameter type by a method invocation conversion; if + * this constructor pertains to an enum type. + * @exception InstantiationException if the class that declares the + * underlying constructor represents an abstract class. + * @exception InvocationTargetException if the underlying constructor + * throws an exception. + * @exception ExceptionInInitializerError if the initialization provoked + * by this method fails. + */ + public T newInstance(Object ... initargs) + throws InstantiationException, IllegalAccessException, + IllegalArgumentException, InvocationTargetException + { + if (!override) { + if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { + Class caller = Reflection.getCallerClass(2); + + checkAccess(caller, clazz, null, modifiers); + } + } + if ((clazz.getModifiers() & Modifier.ENUM) != 0) + throw new IllegalArgumentException("Cannot reflectively create enum objects"); + ConstructorAccessor ca = constructorAccessor; // read volatile + if (ca == null) { + ca = acquireConstructorAccessor(); + } + return (T) ca.newInstance(initargs); + } + + /** + * Returns {@code true} if this constructor was declared to take + * a variable number of arguments; returns {@code false} + * otherwise. + * + * @return {@code true} if an only if this constructor was declared to + * take a variable number of arguments. + * @since 1.5 + */ + public boolean isVarArgs() { + return (getModifiers() & Modifier.VARARGS) != 0; + } + + /** + * Returns {@code true} if this constructor is a synthetic + * constructor; returns {@code false} otherwise. + * + * @return true if and only if this constructor is a synthetic + * constructor as defined by + * The Java™ Language Specification. + * @since 1.5 + */ + public boolean isSynthetic() { + return Modifier.isSynthetic(getModifiers()); + } + + // NOTE that there is no synchronization used here. It is correct + // (though not efficient) to generate more than one + // ConstructorAccessor for a given Constructor. However, avoiding + // synchronization will probably make the implementation more + // scalable. + private ConstructorAccessor acquireConstructorAccessor() { + // First check to see if one has been created yet, and take it + // if so. + ConstructorAccessor tmp = null; + if (root != null) tmp = root.getConstructorAccessor(); + if (tmp != null) { + constructorAccessor = tmp; + } else { + // Otherwise fabricate one and propagate it up to the root + tmp = reflectionFactory.newConstructorAccessor(this); + setConstructorAccessor(tmp); + } + + return tmp; + } + + // Returns ConstructorAccessor for this Constructor object, not + // looking up the chain to the root + ConstructorAccessor getConstructorAccessor() { + return constructorAccessor; + } + + // Sets the ConstructorAccessor for this Constructor object and + // (recursively) its root + void setConstructorAccessor(ConstructorAccessor accessor) { + constructorAccessor = accessor; + // Propagate up + if (root != null) { + root.setConstructorAccessor(accessor); + } + } + + int getSlot() { + return slot; + } + + String getSignature() { + return signature; + } + + byte[] getRawAnnotations() { + return annotations; + } + + byte[] getRawParameterAnnotations() { + return parameterAnnotations; + } + + /** + * @throws NullPointerException {@inheritDoc} + * @since 1.5 + */ + public T getAnnotation(Class annotationClass) { + if (annotationClass == null) + throw new NullPointerException(); + + return (T) declaredAnnotations().get(annotationClass); + } + + /** + * @since 1.5 + */ + public Annotation[] getDeclaredAnnotations() { + return AnnotationParser.toArray(declaredAnnotations()); + } + + private transient Map, Annotation> declaredAnnotations; + + private synchronized Map, Annotation> declaredAnnotations() { + if (declaredAnnotations == null) { + declaredAnnotations = AnnotationParser.parseAnnotations( + annotations, sun.misc.SharedSecrets.getJavaLangAccess(). + getConstantPool(getDeclaringClass()), + getDeclaringClass()); + } + return declaredAnnotations; + } + + /** + * Returns an array of arrays that represent the annotations on the formal + * parameters, in declaration order, of the method represented by + * this {@code Constructor} object. (Returns an array of length zero if the + * underlying method is parameterless. If the method has one or more + * parameters, a nested array of length zero is returned for each parameter + * with no annotations.) The annotation objects contained in the returned + * arrays are serializable. The caller of this method is free to modify + * the returned arrays; it will have no effect on the arrays returned to + * other callers. + * + * @return an array of arrays that represent the annotations on the formal + * parameters, in declaration order, of the method represented by this + * Constructor object + * @since 1.5 + */ + public Annotation[][] getParameterAnnotations() { + int numParameters = parameterTypes.length; + if (parameterAnnotations == null) + return new Annotation[numParameters][0]; + + Annotation[][] result = AnnotationParser.parseParameterAnnotations( + parameterAnnotations, + sun.misc.SharedSecrets.getJavaLangAccess(). + getConstantPool(getDeclaringClass()), + getDeclaringClass()); + if (result.length != numParameters) { + Class declaringClass = getDeclaringClass(); + if (declaringClass.isEnum() || + declaringClass.isAnonymousClass() || + declaringClass.isLocalClass() ) + ; // Can't do reliable parameter counting + else { + if (!declaringClass.isMemberClass() || // top-level + // Check for the enclosing instance parameter for + // non-static member classes + (declaringClass.isMemberClass() && + ((declaringClass.getModifiers() & Modifier.STATIC) == 0) && + result.length + 1 != numParameters) ) { + throw new AnnotationFormatError( + "Parameter annotations don't match number of parameters"); + } + } + } + return result; + } +}