From 0d4d227907e64eae08255f7f993e9bd0820b9d67 Mon Sep 17 00:00:00 2001 From: Tom Tromey Date: Tue, 5 Aug 2003 19:50:54 +0000 Subject: [PATCH] Method.java: Updated status comment. * java/lang/reflect/Method.java: Updated status comment. Imported javadoc from Classpath and re-ordered methods. * java/lang/reflect/Constructor.java: Reindented. Updated status comment. Imported javadoc from Classpath and re-ordered methods. From-SVN: r70184 --- libjava/ChangeLog | 8 + libjava/java/lang/reflect/Constructor.java | 236 +++++++++++++++------ libjava/java/lang/reflect/Method.java | 228 +++++++++++++++----- 3 files changed, 357 insertions(+), 115 deletions(-) diff --git a/libjava/ChangeLog b/libjava/ChangeLog index 4c80d200836..be7d6505378 100644 --- a/libjava/ChangeLog +++ b/libjava/ChangeLog @@ -1,3 +1,11 @@ +2003-08-05 Tom Tromey + + * java/lang/reflect/Method.java: Updated status comment. + Imported javadoc from Classpath and re-ordered methods. + * java/lang/reflect/Constructor.java: Reindented. Updated + status comment. Imported javadoc from Classpath and re-ordered + methods. + 2003-08-05 Thomas Fitzsimmons * gnu/java/awt/peer/gtk/GtkComponentPeer.java (postKeyEvent): diff --git a/libjava/java/lang/reflect/Constructor.java b/libjava/java/lang/reflect/Constructor.java index 4a30e2ae394..53db35a6975 100644 --- a/libjava/java/lang/reflect/Constructor.java +++ b/libjava/java/lang/reflect/Constructor.java @@ -1,6 +1,6 @@ // Constructor.java - Represents a constructor for a class. -/* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation +/* Copyright (C) 1998, 1999, 2000, 2001, 2003 Free Software Foundation This file is part of libgcj. @@ -11,88 +11,196 @@ details. */ package java.lang.reflect; /** - * @author Tom Tromey - * @date December 12, 1998 + * The Constructor class represents a constructor of a class. It also allows + * dynamic creation of an object, via reflection. Invocation on Constructor + * objects knows how to do widening conversions, but throws + * {@link IllegalArgumentException} if a narrowing conversion would be + * necessary. You can query for information on this Constructor regardless + * of location, but construction access may be limited by Java language + * access controls. If you can't do it in the compiler, you can't normally + * do it here either.

+ * + * Note: This class returns and accepts types as Classes, even + * primitive types; there are Class types defined that represent each + * different primitive type. They are java.lang.Boolean.TYPE, + * java.lang.Byte.TYPE,, also available as boolean.class, + * byte.class, etc. These are not to be confused with the + * classes java.lang.Boolean, java.lang.Byte, etc., which are + * real classes.

+ * + * Also note that this is not a serializable class. It is entirely feasible + * to make it serializable using the Externalizable interface, but this is + * on Sun, not me. + * + * @author John Keiser + * @author Eric Blake + * @author Tom Tromey + * @see Member + * @see Class + * @see java.lang.Class#getConstructor(Object[]) + * @see java.lang.Class#getDeclaredConstructor(Object[]) + * @see java.lang.Class#getConstructors() + * @see java.lang.Class#getDeclaredConstructors() + * @since 1.1 + * @status updated to 1.4 */ -/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3 - * "The Java Language Specification", ISBN 0-201-63451-1 - * plus online API docs for JDK 1.2 beta from http://www.javasoft.com. - * Status: Incomplete: needs a private constructor, and - * newInstance() needs to be written. - */ - public final class Constructor extends AccessibleObject implements Member { - public boolean equals (Object obj) - { - if (! (obj instanceof Constructor)) - return false; - Constructor c = (Constructor) obj; - return declaringClass == c.declaringClass && offset == c.offset; - } + /** + * This class is uninstantiable except from native code. + */ + private Constructor () + { + } + /** + * Gets the class that declared this constructor. + * @return the class that declared this member + */ public Class getDeclaringClass () - { - return declaringClass; - } - - public Class[] getExceptionTypes () - { - if (exception_types == null) - getType(); - return (Class[]) exception_types.clone(); - } - - public native int getModifiers (); + { + return declaringClass; + } + /** + * Gets the name of this constructor (the non-qualified name of the class + * it was declared in). + * @return the name of this constructor + */ public String getName () { return declaringClass.getName(); } + /** + * Gets the modifiers this constructor uses. Use the Modifier + * class to interpret the values. A constructor can only have a subset of the + * following modifiers: public, private, protected. + * + * @return an integer representing the modifiers to this Member + * @see Modifier + */ + public native int getModifiers (); + + /** + * Get the parameter list for this constructor, in declaration order. If the + * constructor takes no parameters, returns a 0-length array (not null). + * + * @return a list of the types of the constructor's parameters + */ public Class[] getParameterTypes () - { - if (parameter_types == null) - getType (); - return (Class[]) parameter_types.clone(); - } + { + if (parameter_types == null) + getType (); + return (Class[]) parameter_types.clone(); + } + /** + * Get the exception types this constructor says it throws, in no particular + * order. If the constructor has no throws clause, returns a 0-length array + * (not null). + * + * @return a list of the types in the constructor's throws clause + */ + public Class[] getExceptionTypes () + { + if (exception_types == null) + getType(); + return (Class[]) exception_types.clone(); + } + + /** + * Compare two objects to see if they are semantically equivalent. + * Two Constructors are semantically equivalent if they have the same + * declaring class and the same parameter list. + * + * @param o the object to compare to + * @return true if they are equal; false if not. + */ + public boolean equals (Object obj) + { + if (! (obj instanceof Constructor)) + return false; + Constructor c = (Constructor) obj; + return declaringClass == c.declaringClass && offset == c.offset; + } + + /** + * Get the hash code for the Constructor. + * + * @return the hash code for the object + */ public int hashCode () - { - // FIXME. - return getName().hashCode() + declaringClass.getName().hashCode(); - } + { + // FIXME. + return getName().hashCode() + declaringClass.getName().hashCode(); + } - // Update cached values from method descriptor in class. - private native void getType (); + /** + * Get a String representation of the Constructor. A Constructor's String + * representation is "<modifier> <classname>(<paramtypes>) + * throws <exceptions>", where everything after ')' is omitted if + * there are no exceptions.
Example: + * public java.io.FileInputStream(java.lang.Runnable) + * throws java.io.FileNotFoundException + * + * @return the String representation of the Constructor + */ + public String toString () + { + if (parameter_types == null) + getType (); + StringBuffer b = new StringBuffer (); + Modifier.toString(getModifiers(), b); + b.append(" "); + Method.appendClassName (b, declaringClass); + b.append("("); + for (int i = 0; i < parameter_types.length; ++i) + { + Method.appendClassName (b, parameter_types[i]); + if (i < parameter_types.length - 1) + b.append(","); + } + b.append(")"); + return b.toString(); + } + /** + * Create a new instance by invoking the constructor. Arguments are + * automatically unwrapped and widened, if needed.

+ * + * If this class is abstract, you will get an + * InstantiationException. If the constructor takes 0 + * arguments, you may use null or a 0-length array for args.

+ * + * If this Constructor enforces access control, your runtime context is + * evaluated, and you may have an IllegalAccessException if + * you could not create this object in similar compiled code. If the class + * is uninitialized, you trigger class initialization, which may end in a + * ExceptionInInitializerError.

+ * + * Then, the constructor is invoked. If it completes normally, the return + * value will be the new object. If it completes abruptly, the exception is + * wrapped in an InvocationTargetException. + * + * @param args the arguments to the constructor + * @return the newly created object + * @throws IllegalAccessException if the constructor could not normally be + * called by the Java code (i.e. it is not public) + * @throws IllegalArgumentException if the number of arguments is incorrect; + * or if the arguments types are wrong even with a widening + * conversion + * @throws InstantiationException if the class is abstract + * @throws InvocationTargetException if the constructor throws an exception + * @throws ExceptionInInitializerError if construction triggered class + * initialization, which then failed + */ public native Object newInstance (Object[] args) throws InstantiationException, IllegalAccessException, - IllegalArgumentException, InvocationTargetException; + IllegalArgumentException, InvocationTargetException; - public String toString () - { - if (parameter_types == null) - getType (); - StringBuffer b = new StringBuffer (); - Modifier.toString(getModifiers(), b); - b.append(" "); - Method.appendClassName (b, declaringClass); - b.append("("); - for (int i = 0; i < parameter_types.length; ++i) - { - Method.appendClassName (b, parameter_types[i]); - if (i < parameter_types.length - 1) - b.append(","); - } - b.append(")"); - return b.toString(); - } - - // Can't create these. - private Constructor () - { - } + // Update cached values from method descriptor in class. + private native void getType (); // Declaring class. private Class declaringClass; diff --git a/libjava/java/lang/reflect/Method.java b/libjava/java/lang/reflect/Method.java index 7bd0a312511..3e0507fcaa1 100644 --- a/libjava/java/lang/reflect/Method.java +++ b/libjava/java/lang/reflect/Method.java @@ -1,6 +1,6 @@ // Method.java - Represent method of class or interface. -/* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation +/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation This file is part of libgcj. @@ -13,43 +13,92 @@ package java.lang.reflect; import gnu.gcj.RawData; /** - * @author Tom Tromey - * @date December 12, 1998 + * The Method class represents a member method of a class. It also allows + * dynamic invocation, via reflection. This works for both static and + * instance methods. Invocation on Method objects knows how to do + * widening conversions, but throws {@link IllegalArgumentException} if + * a narrowing conversion would be necessary. You can query for information + * on this Method regardless of location, but invocation access may be limited + * by Java language access controls. If you can't do it in the compiler, you + * can't normally do it here either.

+ * + * Note: This class returns and accepts types as Classes, even + * primitive types; there are Class types defined that represent each + * different primitive type. They are java.lang.Boolean.TYPE, + * java.lang.Byte.TYPE,, also available as boolean.class, + * byte.class, etc. These are not to be confused with the + * classes java.lang.Boolean, java.lang.Byte, etc., which are + * real classes.

+ * + * Also note that this is not a serializable class. It is entirely feasible + * to make it serializable using the Externalizable interface, but this is + * on Sun, not me. + * + * @author John Keiser + * @author Eric Blake + * @author Tom Tromey + * @see Member + * @see Class + * @see java.lang.Class#getMethod(String,Object[]) + * @see java.lang.Class#getDeclaredMethod(String,Object[]) + * @see java.lang.Class#getMethods() + * @see java.lang.Class#getDeclaredMethods() + * @since 1.1 + * @status updated to 1.4 */ -/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3 - * "The Java Language Specification", ISBN 0-201-63451-1 - * plus online API docs for JDK 1.2 beta from http://www.javasoft.com. - * Status: Complete, but not correct: access checks aren't done. - */ - public final class Method extends AccessibleObject implements Member { - public boolean equals (Object obj) + /** + * This class is uninstantiable. + */ + private Method () { - if (! (obj instanceof Method)) - return false; - Method m = (Method) obj; - return declaringClass == m.declaringClass && offset == m.offset; } + /** + * Gets the class that declared this method, or the class where this method + * is a non-inherited member. + * @return the class that declared this member + */ public Class getDeclaringClass () { return declaringClass; } - public Class[] getExceptionTypes () - { - if (exception_types == null) - getType(); - return (Class[]) exception_types.clone(); - } + /** + * Gets the name of this method. + * @return the name of this method + */ + public native String getName (); + /** + * Gets the modifiers this method uses. Use the Modifier + * class to interpret the values. A method can only have a subset of the + * following modifiers: public, private, protected, abstract, static, + * final, synchronized, native, and strictfp. + * + * @return an integer representing the modifiers to this Member + * @see Modifier + */ public native int getModifiers (); - public native String getName (); - - private native void getType (); + /** + * Gets the return type of this method. + * @return the type of this method + */ + public Class getReturnType () + { + if (return_type == null) + getType(); + return return_type; + } + /** + * Get the parameter list for this method, in declaration order. If the + * method takes no parameters, returns a 0-length array (not null). + * + * @return a list of the types of the method's parameters + */ public Class[] getParameterTypes () { if (parameter_types == null) @@ -57,43 +106,57 @@ public final class Method extends AccessibleObject implements Member return (Class[]) parameter_types.clone(); } - public Class getReturnType () + /** + * Get the exception types this method says it throws, in no particular + * order. If the method has no throws clause, returns a 0-length array + * (not null). + * + * @return a list of the types in the method's throws clause + */ + public Class[] getExceptionTypes () { - if (return_type == null) + if (exception_types == null) getType(); - return return_type; + return (Class[]) exception_types.clone(); } - public int hashCode () + /** + * Compare two objects to see if they are semantically equivalent. + * Two Methods are semantically equivalent if they have the same declaring + * class, name, and parameter list. This ignores different exception + * clauses or return types. + * + * @param o the object to compare to + * @return true if they are equal; false if not + */ + public boolean equals (Object obj) { - // FIXME. - return getName().hashCode() + declaringClass.getName().hashCode(); + if (! (obj instanceof Method)) + return false; + Method m = (Method) obj; + return declaringClass == m.declaringClass && offset == m.offset; } - public native Object invoke (Object obj, Object[] args) - throws IllegalAccessException, IllegalArgumentException, - InvocationTargetException; - - // Append a class name to a string buffer. We try to print the - // fully-qualified name, the way that a Java programmer would expect - // it to be written. Weirdly, Class has no appropriate method for - // this. - static void appendClassName (StringBuffer buf, Class k) + /** + * Get the hash code for the Method. + * + * @return the hash code for the object + */ + public int hashCode () { - if (k.isArray ()) - { - appendClassName (buf, k.getComponentType ()); - buf.append ("[]"); - } - else - { - // This is correct for primitive and reference types. Really - // we'd like `Main$Inner' to be printed as `Main.Inner', I - // think, but that is a pain. - buf.append (k.getName ()); - } + // FIXME. + return getName().hashCode() + declaringClass.getName().hashCode(); } + /** + * Get a String representation of the Method. A Method's String + * representation is "<modifiers> <returntype> + * <methodname>(<paramtypes>) throws <exceptions>", where + * everything after ')' is omitted if there are no exceptions.
Example: + * public static int run(java.lang.Runnable,int) + * + * @return the String representation of the Method + */ public String toString () { if (parameter_types == null) @@ -128,8 +191,71 @@ public final class Method extends AccessibleObject implements Member return b.toString(); } - private Method () + /** + * Invoke the method. Arguments are automatically unwrapped and widened, + * and the result is automatically wrapped, if needed.

+ * + * If the method is static, o will be ignored. Otherwise, + * the method uses dynamic lookup as described in JLS 15.12.4.4. You cannot + * mimic the behavior of nonvirtual lookup (as in super.foo()). This means + * you will get a NullPointerException if o is + * null, and an IllegalArgumentException if it is incompatible + * with the declaring class of the method. If the method takes 0 arguments, + * you may use null or a 0-length array for args.

+ * + * Next, if this Method enforces access control, your runtime context is + * evaluated, and you may have an IllegalAccessException if + * you could not acces this method in similar compiled code. If the method + * is static, and its class is uninitialized, you trigger class + * initialization, which may end in a + * ExceptionInInitializerError.

+ * + * Finally, the method is invoked. If it completes normally, the return value + * will be null for a void method, a wrapped object for a primitive return + * method, or the actual return of an Object method. If it completes + * abruptly, the exception is wrapped in an + * InvocationTargetException. + * + * @param o the object to invoke the method on + * @param args the arguments to the method + * @return the return value of the method, wrapped in the appropriate + * wrapper if it is primitive + * @throws IllegalAccessException if the method could not normally be called + * by the Java code (i.e. it is not public) + * @throws IllegalArgumentException if the number of arguments is incorrect; + * if the arguments types are wrong even with a widening conversion; + * or if o is not an instance of the class or interface + * declaring this method + * @throws InvocationTargetException if the method throws an exception + * @throws NullPointerException if o is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static method triggered + * class initialization, which then failed + */ + public native Object invoke (Object obj, Object[] args) + throws IllegalAccessException, IllegalArgumentException, + InvocationTargetException; + + private native void getType (); + + // Append a class name to a string buffer. We try to print the + // fully-qualified name, the way that a Java programmer would expect + // it to be written. Weirdly, Class has no appropriate method for + // this. + static void appendClassName (StringBuffer buf, Class k) { + if (k.isArray ()) + { + appendClassName (buf, k.getComponentType ()); + buf.append ("[]"); + } + else + { + // This is correct for primitive and reference types. Really + // we'd like `Main$Inner' to be printed as `Main.Inner', I + // think, but that is a pain. + buf.append (k.getName ()); + } } // Declaring class. -- 2.30.2