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authorTom Tromey <tromey@gcc.gnu.org>2005-07-16 00:30:23 +0000
committerTom Tromey <tromey@gcc.gnu.org>2005-07-16 00:30:23 +0000
commitf911ba985aa7fe0096c386c5be385ac5825ea527 (patch)
treea0b991cf5866ae1d616639b906ac001811d74508 /libjava/classpath/java/lang/StackTraceElement.java
parent6f4434b39b261de5317dc81ddfdd94d2e1d62b11 (diff)
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Initial revision
From-SVN: r102074
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+/* StackTraceElement.java -- One function call or call stack element
+ Copyright (C) 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.lang;
+
+import java.io.Serializable;
+
+/**
+ * One function call or stack trace element. Gives information about
+ * the execution point such as the source file name, the line number,
+ * the fully qualified class name, the method name and whether this method
+ * is native, if this information is known.
+ *
+ * @author Mark Wielaard (mark@klomp.org)
+ * @author Eric Blake (ebb9@email.byu.edu)
+ * @since 1.4
+ * @status updated to 1.4
+ */
+public final class StackTraceElement implements Serializable
+{
+ /**
+ * Compatible with JDK 1.4+.
+ */
+ private static final long serialVersionUID = 6992337162326171013L;
+
+ /**
+ * The name of the file, null if unknown.
+ *
+ * @serial the source code filename, if known
+ */
+ private final String fileName;
+
+ /**
+ * The line number in the file, negative if unknown.
+ *
+ * @serial the source code line number, if known
+ */
+ private final int lineNumber;
+
+ /**
+ * The fully qualified class name, null if unknown.
+ *
+ * @serial the enclosing class, if known
+ */
+ private final String declaringClass;
+
+ /**
+ * The method name in the class, null if unknown.
+ *
+ * @serial the enclosing method, if known
+ */
+ private final String methodName;
+
+ /** Whether the method is native. */
+ private final transient boolean isNative;
+
+ /**
+ * A package local constructor for the StackTraceElement class, to be
+ * called by the Virtual Machine as part of Throwable.fillInStackTrace.
+ * There are no public constructors defined for this class. Creation
+ * of new elements is implementation specific.
+ *
+ * @param fileName the name of the file, null if unknown
+ * @param lineNumber the line in the file, negative if unknown
+ * @param className the fully qualified name of the class, null if unknown
+ * @param methodName the name of the method, null if unknown
+ * @param isNative true if native, false otherwise
+ */
+ StackTraceElement(String fileName, int lineNumber, String className,
+ String methodName, boolean isNative)
+ {
+ this.fileName = fileName;
+ this.lineNumber = lineNumber;
+ this.declaringClass = className;
+ this.methodName = methodName;
+ this.isNative = isNative;
+ }
+
+ /**
+ * Returns the name of the file, or null if unknown. This is usually
+ * obtained from the <code>SourceFile</code> attribute of the class file
+ * format, if present.
+ *
+ * @return the file name
+ */
+ public String getFileName()
+ {
+ return fileName;
+ }
+
+ /**
+ * Returns the line number in the file, or a negative number if unknown.
+ * This is usually obtained from the <code>LineNumberTable</code> attribute
+ * of the method in the class file format, if present.
+ *
+ * @return the line number
+ */
+ public int getLineNumber()
+ {
+ return lineNumber;
+ }
+
+ /**
+ * Returns the fully qualified class name, or null if unknown.
+ *
+ * @return the class name
+ */
+ public String getClassName()
+ {
+ return declaringClass;
+ }
+
+ /**
+ * Returns the method name in the class, or null if unknown. If the
+ * execution point is in a constructor, the name is
+ * <code>&lt;init&gt;</code>; if the execution point is in the class
+ * initializer, the name is <code>&lt;clinit&gt;</code>.
+ *
+ * @return the method name
+ */
+ public String getMethodName()
+ {
+ return methodName;
+ }
+
+ /**
+ * Returns true if the method is native, or false if it is not or unknown.
+ *
+ * @return whether the method is native
+ */
+ public boolean isNativeMethod()
+ {
+ return isNative;
+ }
+
+ /**
+ * Returns a string representation of this stack trace element. The
+ * returned String is implementation specific. This implementation
+ * returns the following String: "[class][.][method]([file][:line])".
+ * If the fully qualified class name or the method is unknown it is
+ * omitted including the point seperator. If the source file name is
+ * unknown it is replaced by "Unknown Source" if the method is not native
+ * or by "Native Method" if the method is native. If the line number
+ * is unknown it and the colon are omitted.
+ *
+ * @return a string representation of this execution point
+ */
+ public String toString()
+ {
+ StringBuffer sb = new StringBuffer();
+ if (declaringClass != null)
+ {
+ sb.append(declaringClass);
+ if (methodName != null)
+ sb.append('.');
+ }
+ if (methodName != null)
+ sb.append(methodName);
+ sb.append(" (");
+ if (fileName != null)
+ sb.append(fileName);
+ else
+ sb.append(isNative ? "Native Method" : "Unknown Source");
+ if (lineNumber >= 0)
+ sb.append(':').append(lineNumber);
+ sb.append(')');
+ return sb.toString();
+ }
+
+ /**
+ * Returns true if the given object is also a StackTraceElement and all
+ * attributes, except the native flag, are equal (either the same attribute
+ * between the two elments are null, or both satisfy Object.equals).
+ *
+ * @param o the object to compare
+ * @return true if the two are equal
+ */
+ public boolean equals(Object o)
+ {
+ if (! (o instanceof StackTraceElement))
+ return false;
+ StackTraceElement e = (StackTraceElement) o;
+ return equals(fileName, e.fileName)
+ && lineNumber == e.lineNumber
+ && equals(declaringClass, e.declaringClass)
+ && equals(methodName, e.methodName);
+ }
+
+ /**
+ * Returns the hashCode of this StackTraceElement. This implementation
+ * computes the hashcode by xor-ing the hashcode of all attributes except
+ * the native flag.
+ *
+ * @return the hashcode
+ */
+ public int hashCode()
+ {
+ return hashCode(fileName) ^ lineNumber ^ hashCode(declaringClass)
+ ^ hashCode(methodName);
+ }
+
+ /**
+ * Compare two objects according to Collection semantics.
+ *
+ * @param o1 the first object
+ * @param o2 the second object
+ * @return o1 == null ? o2 == null : o1.equals(o2)
+ */
+ private static boolean equals(Object o1, Object o2)
+ {
+ return o1 == null ? o2 == null : o1.equals(o2);
+ }
+
+ /**
+ * Hash an object according to Collection semantics.
+ *
+ * @param o the object to hash
+ * @return o1 == null ? 0 : o1.hashCode()
+ */
+ private static int hashCode(Object o)
+ {
+ return o == null ? 0 : o.hashCode();
+ }
+}
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