--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.base/share/classes/java/lang/StackTraceElement.java Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,221 @@
+/*
+ * Copyright (c) 2000, 2013, 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;
+
+import java.util.Objects;
+
+/**
+ * An element in a stack trace, as returned by {@link
+ * Throwable#getStackTrace()}. Each element represents a single stack frame.
+ * All stack frames except for the one at the top of the stack represent
+ * a method invocation. The frame at the top of the stack represents the
+ * execution point at which the stack trace was generated. Typically,
+ * this is the point at which the throwable corresponding to the stack trace
+ * was created.
+ *
+ * @since 1.4
+ * @author Josh Bloch
+ */
+public final class StackTraceElement implements java.io.Serializable {
+ // Normally initialized by VM (public constructor added in 1.5)
+ private String declaringClass;
+ private String methodName;
+ private String fileName;
+ private int lineNumber;
+
+ /**
+ * Creates a stack trace element representing the specified execution
+ * point.
+ *
+ * @param declaringClass the fully qualified name of the class containing
+ * the execution point represented by the stack trace element
+ * @param methodName the name of the method containing the execution point
+ * represented by the stack trace element
+ * @param fileName the name of the file containing the execution point
+ * represented by the stack trace element, or {@code null} if
+ * this information is unavailable
+ * @param lineNumber the line number of the source line containing the
+ * execution point represented by this stack trace element, or
+ * a negative number if this information is unavailable. A value
+ * of -2 indicates that the method containing the execution point
+ * is a native method
+ * @throws NullPointerException if {@code declaringClass} or
+ * {@code methodName} is null
+ * @since 1.5
+ */
+ public StackTraceElement(String declaringClass, String methodName,
+ String fileName, int lineNumber) {
+ this.declaringClass = Objects.requireNonNull(declaringClass, "Declaring class is null");
+ this.methodName = Objects.requireNonNull(methodName, "Method name is null");
+ this.fileName = fileName;
+ this.lineNumber = lineNumber;
+ }
+
+ /**
+ * Returns the name of the source file containing the execution point
+ * represented by this stack trace element. Generally, this corresponds
+ * to the {@code SourceFile} attribute of the relevant {@code class}
+ * file (as per <i>The Java Virtual Machine Specification</i>, Section
+ * 4.7.7). In some systems, the name may refer to some source code unit
+ * other than a file, such as an entry in source repository.
+ *
+ * @return the name of the file containing the execution point
+ * represented by this stack trace element, or {@code null} if
+ * this information is unavailable.
+ */
+ public String getFileName() {
+ return fileName;
+ }
+
+ /**
+ * Returns the line number of the source line containing the execution
+ * point represented by this stack trace element. Generally, this is
+ * derived from the {@code LineNumberTable} attribute of the relevant
+ * {@code class} file (as per <i>The Java Virtual Machine
+ * Specification</i>, Section 4.7.8).
+ *
+ * @return the line number of the source line containing the execution
+ * point represented by this stack trace element, or a negative
+ * number if this information is unavailable.
+ */
+ public int getLineNumber() {
+ return lineNumber;
+ }
+
+ /**
+ * Returns the fully qualified name of the class containing the
+ * execution point represented by this stack trace element.
+ *
+ * @return the fully qualified name of the {@code Class} containing
+ * the execution point represented by this stack trace element.
+ */
+ public String getClassName() {
+ return declaringClass;
+ }
+
+ /**
+ * Returns the name of the method containing the execution point
+ * represented by this stack trace element. If the execution point is
+ * contained in an instance or class initializer, this method will return
+ * the appropriate <i>special method name</i>, {@code <init>} or
+ * {@code <clinit>}, as per Section 3.9 of <i>The Java Virtual
+ * Machine Specification</i>.
+ *
+ * @return the name of the method containing the execution point
+ * represented by this stack trace element.
+ */
+ public String getMethodName() {
+ return methodName;
+ }
+
+ /**
+ * Returns true if the method containing the execution point
+ * represented by this stack trace element is a native method.
+ *
+ * @return {@code true} if the method containing the execution point
+ * represented by this stack trace element is a native method.
+ */
+ public boolean isNativeMethod() {
+ return lineNumber == -2;
+ }
+
+ /**
+ * Returns a string representation of this stack trace element. The
+ * format of this string depends on the implementation, but the following
+ * examples may be regarded as typical:
+ * <ul>
+ * <li>
+ * {@code "MyClass.mash(MyClass.java:9)"} - Here, {@code "MyClass"}
+ * is the <i>fully-qualified name</i> of the class containing the
+ * execution point represented by this stack trace element,
+ * {@code "mash"} is the name of the method containing the execution
+ * point, {@code "MyClass.java"} is the source file containing the
+ * execution point, and {@code "9"} is the line number of the source
+ * line containing the execution point.
+ * <li>
+ * {@code "MyClass.mash(MyClass.java)"} - As above, but the line
+ * number is unavailable.
+ * <li>
+ * {@code "MyClass.mash(Unknown Source)"} - As above, but neither
+ * the file name nor the line number are available.
+ * <li>
+ * {@code "MyClass.mash(Native Method)"} - As above, but neither
+ * the file name nor the line number are available, and the method
+ * containing the execution point is known to be a native method.
+ * </ul>
+ * @see Throwable#printStackTrace()
+ */
+ public String toString() {
+ return getClassName() + "." + methodName +
+ (isNativeMethod() ? "(Native Method)" :
+ (fileName != null && lineNumber >= 0 ?
+ "(" + fileName + ":" + lineNumber + ")" :
+ (fileName != null ? "("+fileName+")" : "(Unknown Source)")));
+ }
+
+ /**
+ * Returns true if the specified object is another
+ * {@code StackTraceElement} instance representing the same execution
+ * point as this instance. Two stack trace elements {@code a} and
+ * {@code b} are equal if and only if:
+ * <pre>{@code
+ * equals(a.getFileName(), b.getFileName()) &&
+ * a.getLineNumber() == b.getLineNumber()) &&
+ * equals(a.getClassName(), b.getClassName()) &&
+ * equals(a.getMethodName(), b.getMethodName())
+ * }</pre>
+ * where {@code equals} has the semantics of {@link
+ * java.util.Objects#equals(Object, Object) Objects.equals}.
+ *
+ * @param obj the object to be compared with this stack trace element.
+ * @return true if the specified object is another
+ * {@code StackTraceElement} instance representing the same
+ * execution point as this instance.
+ */
+ public boolean equals(Object obj) {
+ if (obj==this)
+ return true;
+ if (!(obj instanceof StackTraceElement))
+ return false;
+ StackTraceElement e = (StackTraceElement)obj;
+ return e.declaringClass.equals(declaringClass) &&
+ e.lineNumber == lineNumber &&
+ Objects.equals(methodName, e.methodName) &&
+ Objects.equals(fileName, e.fileName);
+ }
+
+ /**
+ * Returns a hash code value for this stack trace element.
+ */
+ public int hashCode() {
+ int result = 31*declaringClass.hashCode() + methodName.hashCode();
+ result = 31*result + Objects.hashCode(fileName);
+ result = 31*result + lineNumber;
+ return result;
+ }
+
+ private static final long serialVersionUID = 6992337162326171013L;
+}