JDK14/Java14源码在线阅读
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* Copyright (c) 2016, 2019, 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
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*/
package jdk.jfr.consumer;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.time.Duration;
import java.time.Instant;
import java.time.OffsetDateTime;
import java.util.Comparator;
import java.util.List;
import java.util.Objects;
import jdk.jfr.Timespan;
import jdk.jfr.Timestamp;
import jdk.jfr.ValueDescriptor;
import jdk.jfr.internal.consumer.JdkJfrConsumer;
import jdk.jfr.internal.consumer.ObjectFactory;
import jdk.jfr.internal.PrivateAccess;
import jdk.jfr.internal.Type;
import jdk.jfr.internal.consumer.ObjectContext;
import jdk.jfr.internal.tool.PrettyWriter;
/**
* A complex data type that consists of one or more fields.
* <p>
* This class provides methods to select and query nested objects by passing a
* dot {@code "."} delimited {@code String} object (for instance,
* {@code "aaa.bbb"}). A method evaluates a nested object from left to right,
* and if a part is {@code null}, it throws {@code NullPointerException}.
*
* @since 9
*/
public class RecordedObject {
static{
JdkJfrConsumer access = new JdkJfrConsumer() {
public List<Type> readTypes(RecordingFile file) throws IOException {
return file.readTypes();
}
public boolean isLastEventInChunk(RecordingFile file) {
return file.isLastEventInChunk();
}
@Override
public Object getOffsetDataTime(RecordedObject event, String name) {
return event.getOffsetDateTime(name);
}
@Override
public RecordedClass newRecordedClass(ObjectContext objectContext, long id, Object[] values) {
return new RecordedClass(objectContext, id, values);
}
@Override
public RecordedClassLoader newRecordedClassLoader(ObjectContext objectContext, long id, Object[] values) {
return new RecordedClassLoader(objectContext, id, values);
}
@Override
public Comparator<? super RecordedEvent> eventComparator() {
return new Comparator<RecordedEvent>() {
@Override
public int compare(RecordedEvent e1, RecordedEvent e2) {
return Long.compare(e1.endTimeTicks, e2.endTimeTicks);
}
};
}
@Override
public RecordedStackTrace newRecordedStackTrace(ObjectContext objectContext, Object[] values) {
return new RecordedStackTrace(objectContext, values);
}
@Override
public RecordedThreadGroup newRecordedThreadGroup(ObjectContext objectContext, Object[] values) {
return new RecordedThreadGroup(objectContext, values);
}
@Override
public RecordedFrame newRecordedFrame(ObjectContext objectContext, Object[] values) {
return new RecordedFrame(objectContext, values);
}
@Override
public RecordedThread newRecordedThread(ObjectContext objectContext, long id, Object[] values) {
return new RecordedThread(objectContext, id, values);
}
@Override
public RecordedMethod newRecordedMethod(ObjectContext objectContext, Object[] values) {
return new RecordedMethod(objectContext, values);
}
@Override
public RecordedEvent newRecordedEvent(ObjectContext objectContext, Object[] values, long startTimeTicks, long endTimeTicks) {
return new RecordedEvent(objectContext, values, startTimeTicks, endTimeTicks);
}
@Override
public void setStartTicks(RecordedEvent event, long startTicks) {
event.startTimeTicks = startTicks;
}
@Override
public void setEndTicks(RecordedEvent event, long endTicks) {
event.endTimeTicks = endTicks;
}
@Override
public Object[] eventValues(RecordedEvent event) {
return event.objects;
}
};
JdkJfrConsumer.setAccess(access);
}
private final static class UnsignedValue {
private final Object o;
UnsignedValue(Object o) {
this.o = o;
}
Object value() {
return o;
}
}
final Object[] objects;
final ObjectContext objectContext;
// package private, not to be subclassed outside this package
RecordedObject(ObjectContext objectContext, Object[] objects) {
this.objectContext = objectContext;
this.objects = objects;
}
// package private
final <T> T getTyped(String name, Class<T> clazz, T defaultValue) {
// Unnecessary to check field presence twice, but this
// will do for now.
if (!hasField(name)) {
return defaultValue;
}
T object = getValue(name);
if (object == null || object.getClass().isAssignableFrom(clazz)) {
return object;
} else {
return defaultValue;
}
}
/**
* Returns {@code true} if a field with the given name exists, {@code false}
* otherwise.
*
* @param name name of the field to get, not {@code null}
*
* @return {@code true} if the field exists, {@code false} otherwise.
*
* @see #getFields()
*/
public boolean hasField(String name) {
Objects.requireNonNull(name);
for (ValueDescriptor v : objectContext.fields) {
if (v.getName().equals(name)) {
return true;
}
}
int dotIndex = name.indexOf(".");
if (dotIndex > 0) {
String structName = name.substring(0, dotIndex);
for (ValueDescriptor v : objectContext.fields) {
if (!v.getFields().isEmpty() && v.getName().equals(structName)) {
RecordedObject child = getValue(structName);
if (child != null) {
return child.hasField(name.substring(dotIndex + 1));
}
}
}
}
return false;
}
/**
* Returns the value of the field with the given name.
* <p>
* The return type may be a primitive type or a subclass of
* {@link RecordedObject}.
* <p>
* It's possible to index into a nested object by using {@code "."} (for
* instance {@code "thread.group.parent.name}").
* <p>
* A field might change or be removed in a future JDK release. A best practice
* for callers of this method is to validate the field before attempting access.
* <p>
* Example
*
* <pre>
* <code>
* if (event.hasField("intValue")) {
* int intValue = event.getValue("intValue");
* System.out.println("Int value: " + intValue);
* }
*
* if (event.hasField("objectClass")) {
* RecordedClass clazz = event.getValue("objectClass");
* System.out.println("Class name: " + clazz.getName());
* }
*
* if (event.hasField("sampledThread")) {
* RecordedThread sampledThread = event.getValue("sampledThread");
* System.out.println("Sampled thread: " + sampledThread.getName());
* }
* </code>
* </pre>
*
* @param <T> the return type
* @param name of the field to get, not {@code null}
* @throws IllegalArgumentException if no field called {@code name} exists
*
* @return the value, can be {@code null}
*
* @see #hasField(String)
*
*/
final public <T> T getValue(String name) {
@SuppressWarnings("unchecked")
T t = (T) getValue(name, false);
return t;
}
protected Object objectAt(int index) {
return objects[index];
}
private Object getValue(String name, boolean allowUnsigned) {
Objects.requireNonNull(name);
int index = 0;
for (ValueDescriptor v : objectContext.fields) {
if (name.equals(v.getName())) {
Object object = objectAt(index);
if (object == null) {
// error or missing
return null;
}
if (v.getFields().isEmpty()) {
if (allowUnsigned && PrivateAccess.getInstance().isUnsigned(v)) {
// Types that are meaningless to widen
if (object instanceof Character || object instanceof Long) {
return object;
}
return new UnsignedValue(object);
}
return object; // primitives and primitive arrays
} else {
if (object instanceof RecordedObject) {
// known types from factory
return object;
}
// must be array type
Object[] array = (Object[]) object;
if (v.isArray()) {
// struct array
return structifyArray(v, array, 0);
}
// struct
return new RecordedObject(objectContext.getInstance(v), (Object[]) object);
}
}
index++;
}
int dotIndex = name.indexOf(".");
if (dotIndex > 0) {
String structName = name.substring(0, dotIndex);
for (ValueDescriptor v : objectContext.fields) {
if (!v.getFields().isEmpty() && v.getName().equals(structName)) {
RecordedObject child = getValue(structName);
String subName = name.substring(dotIndex + 1);
if (child != null) {
return child.getValue(subName, allowUnsigned);
} else {
// Call getValueDescriptor to trigger IllegalArgumentException if the name is
// incorrect. Type can't be validate due to type erasure
getValueDescriptor(v.getFields(), subName, null);
throw new NullPointerException("Field value for \"" + structName + "\" was null. Can't access nested field \"" + subName + "\"");
}
}
}
}
throw new IllegalArgumentException("Could not find field with name " + name);
}
// Returns the leaf value descriptor matches both name or value, or throws an
// IllegalArgumentException
private ValueDescriptor getValueDescriptor(List<ValueDescriptor> descriptors, String name, String leafType) {
int dotIndex = name.indexOf(".");
if (dotIndex > 0) {
String first = name.substring(0, dotIndex);
String second = name.substring(dotIndex + 1);
for (ValueDescriptor v : descriptors) {
if (v.getName().equals(first)) {
List<ValueDescriptor> fields = v.getFields();
if (!fields.isEmpty()) {
return getValueDescriptor(v.getFields(), second, leafType);
}
}
}
throw new IllegalArgumentException("Attempt to get unknown field \"" + first + "\"");
}
for (ValueDescriptor v : descriptors) {
if (v.getName().equals(name)) {
if (leafType != null && !v.getTypeName().equals(leafType)) {
throw new IllegalArgumentException("Attempt to get " + v.getTypeName() + " field \"" + name + "\" with illegal data type conversion " + leafType);
}
return v;
}
}
throw new IllegalArgumentException("\"Attempt to get unknown field \"" + name + "\"");
}
// Gets a value, but checks that type and name is correct first
// This is to prevent a call to getString on a thread field, that is
// null to succeed.
private <T> T getTypedValue(String name, String typeName) {
Objects.requireNonNull(name);
// Validate name and type first
getValueDescriptor(objectContext.fields, name, typeName);
return getValue(name);
}
private Object[] structifyArray(ValueDescriptor v, Object[] array, int dimension) {
if (array == null) {
return null;
}
Object[] structArray = new Object[array.length];
ObjectContext objContext = objectContext.getInstance(v);
for (int i = 0; i < structArray.length; i++) {
Object arrayElement = array[i];
if (dimension == 0) {
// No general way to handle structarrays
// without invoking ObjectFactory for every instance (which may require id)
if (isStackFrameType(v.getTypeName())) {
structArray[i] = new RecordedFrame(objContext, (Object[]) arrayElement);
} else {
structArray[i] = new RecordedObject(objContext, (Object[]) arrayElement);
}
} else {
structArray[i] = structifyArray(v, (Object[]) arrayElement, dimension - 1);
}
}
return structArray;
}
private boolean isStackFrameType(String typeName) {
if (ObjectFactory.STACK_FRAME_VERSION_1.equals(typeName)) {
return true;
}
if (ObjectFactory.STACK_FRAME_VERSION_2.equals(typeName)) {
return true;
}
return false;
}
/**
* Returns an immutable list of the fields for this object.
*
* @return the fields, not {@code null}
*/
public List<ValueDescriptor> getFields() {
return objectContext.fields;
}
/**
* Returns the value of a field of type {@code boolean}.
* <p>
* It's possible to index into a nested object using {@code "."} (for example,
* {@code "aaa.bbb"}).
* <p>
* A field might change or be removed in a future JDK release. A best practice
* for callers of this method is to validate the field before attempting access.
*
* @param name name of the field to get, not {@code null}
*
* @return the value of the field, {@code true} or {@code false}
*
* @throws IllegalArgumentException if the field doesn't exist, or the field is
* not of type {@code boolean}
*
* @see #hasField(String)
* @see #getValue(String)
*/
public final boolean getBoolean(String name) {
Object o = getValue(name);
if (o instanceof Boolean) {
return ((Boolean) o).booleanValue();
}
throw newIllegalArgumentException(name, "boolean");
}
/**
* Returns the value of a field of type {@code byte}.
* <p>
* It's possible to index into a nested object using {@code "."} (for example,
* {@code "foo.bar"}).
* <p>
* A field might change or be removed in a future JDK release. A best practice
* for callers of this method is to validate the field before attempting access.
*
* @param name of the field to get, not {@code null}
*
* @return the value of the field
*
* @throws IllegalArgumentException if the field doesn't exist, or the field is
* not of type {@code byte}
*
* @see #hasField(String)
* @see #getValue(String)
*/
public final byte getByte(String name) {
Object o = getValue(name);
if (o instanceof Byte) {
return ((Byte) o).byteValue();
}
throw newIllegalArgumentException(name, "byte");
}
/**
* Returns the value of a field of type {@code char}.
* <p>
* It's possible to index into a nested object using {@code "."} (for example,
* {@code "aaa.bbb"}).
* <p>
* A field might change or be removed in a future JDK release. A best practice
* for callers of this method is to validate the field before attempting access.
*
* @param name of the field to get, not {@code null}
*
* @return the value of the field as a {@code char}
*
* @throws IllegalArgumentException if the field doesn't exist, or the field is
* not of type {@code char}
*
* @see #hasField(String)
* @see #getValue(String)
*/
public final char getChar(String name) {
Object o = getValue(name);
if (o instanceof Character) {
return ((Character) o).charValue();
}
throw newIllegalArgumentException(name, "char");
}
/**
* Returns the value of a field of type {@code short} or of another primitive
* type convertible to type {@code short} by a widening conversion.
* <p>
* This method can be used on the following types: {@code short} and {@code byte}.
* <p>
* If the field has the {@code @Unsigned} annotation and is of a narrower type
* than {@code short}, then the value is returned as an unsigned.
* <p>
* It's possible to index into a nested object using {@code "."} (for example,
* {@code "aaa.bbb"}).
* <p>
* A field might change or be removed in a future JDK release. A best practice
* for callers of this method is to validate the field before attempting access.
*
* @param name of the field to get, not {@code null}
*
* @return the value of the field converted to type {@code short}
*
* @throws IllegalArgumentException if the field doesn't exist, or the field
* value can't be converted to the type {@code short} by a widening
* conversion
*
* @see #hasField(String)
* @set #getValue(String)
*/
public final short getShort(String name) {
Object o = getValue(name, true);
if (o instanceof Short) {
return ((Short) o).shortValue();
}
if (o instanceof Byte) {
return ((Byte) o).byteValue();
}
if (o instanceof UnsignedValue) {
Object u = ((UnsignedValue) o).value();
if (u instanceof Short) {
return ((Short) u).shortValue();
}
if (u instanceof Byte) {
return (short) Byte.toUnsignedInt(((Byte) u));
}
}
throw newIllegalArgumentException(name, "short");
}
/**
* Returns the value of a field of type {@code int} or of another primitive type
* that is convertible to type {@code int} by a widening conversion.
* <p>
* This method can be used on fields of the following types: {@code int},
* {@code short}, {@code char}, and {@code byte}.
* <p>
* If the field has the {@code @Unsigned} annotation and is of a narrower type
* than {@code int}, then the value will be returned as an unsigned.
* <p>
* It's possible to index into a nested object using {@code "."} (for example,
* {@code "aaa.bbb"}).
* <p>
* A field might change or be removed in a future JDK release. A best practice
* for callers of this method is to validate the field before attempting access.
*
* @param name of the field to get, not {@code null}
*
* @return the value of the field converted to type {@code int}
*
* @throws IllegalArgumentException if the field doesn't exist, or the field
* value can't be converted to the type {@code int} by a widening
* conversion
*
* @see #hasField(String)
* @set #getValue(String)
*/
public final int getInt(String name) {
Object o = getValue(name, true);
if (o instanceof Integer) {
return ((Integer) o).intValue();
}
if (o instanceof Short) {
return ((Short) o).intValue();
}
if (o instanceof Character) {
return ((Character) o).charValue();
}
if (o instanceof Byte) {
return ((Byte) o).intValue();
}
if (o instanceof UnsignedValue) {
Object u = ((UnsignedValue) o).value();
if (u instanceof Integer) {
return ((Integer) u).intValue();
}
if (u instanceof Short) {
return Short.toUnsignedInt(((Short) u));
}
if (u instanceof Byte) {
return Byte.toUnsignedInt(((Byte) u));
}
}
throw newIllegalArgumentException(name, "int");
}
/**
* Returns the value of a field of type {@code float} or of another primitive
* type convertible to type {@code float} by a widening conversion.
* <p>
* This method can be used on fields of the following types: {@code float},
* {@code long}, {@code int}, {@code short}, {@code char}, and {@code byte}.
* <p>
* It's possible to index into a nested object using {@code "."} (for example,
* {@code "aaa.bbb"}).
* <p>
* A field might change or be removed in a future JDK release. A best practice
* for callers of this method is to validate the field before attempting access.
*
* @param name of the field to get, not {@code null}
*
* @return the value of the field converted to type {@code float}
*
* @throws IllegalArgumentException if the field doesn't exist, or the field
* value can't be converted to the type {@code float} by a widening
* conversion
*
* @see #hasField(String)
* @set #getValue(String)
*/
public final float getFloat(String name) {
Object o = getValue(name);
if (o instanceof Float) {
return ((Float) o).floatValue();
}
if (o instanceof Long) {
return ((Long) o).floatValue();
}
if (o instanceof Integer) {
return ((Integer) o).floatValue();
}
if (o instanceof Short) {
return ((Short) o).floatValue();
}
if (o instanceof Byte) {
return ((Byte) o).byteValue();
}
if (o instanceof Character) {
return ((Character) o).charValue();
}
throw newIllegalArgumentException(name, "float");
}
/**
* Returns the value of a field of type {@code long} or of another primitive
* type that is convertible to type {@code long} by a widening conversion.
* <p>
* This method can be used on fields of the following types: {@code long},
* {@code int}, {@code short}, {@code char}, and {@code byte}.
* <p>
* If the field has the {@code @Unsigned} annotation and is of a narrower type
* than {@code long}, then the value will be returned as an unsigned.
* <p>
* It's possible to index into a nested object using {@code "."} (for example,
* {@code "aaa.bbb"}).
* <p>
* A field might change or be removed in a future JDK release. A best practice
* for callers of this method is to validate the field before attempting access.
*
* @param name of the field to get, not {@code null}
*
* @return the value of the field converted to type {@code long}
*
* @throws IllegalArgumentException if the field doesn't exist, or the field
* value can't be converted to the type {@code long} via a widening
* conversion
*
* @see #hasField(String)
* @set #getValue(String)
*/
public final long getLong(String name) {
Object o = getValue(name, true);
if (o instanceof Long) {
return ((Long) o).longValue();
}
if (o instanceof Integer) {
return ((Integer) o).longValue();
}
if (o instanceof Short) {
return ((Short) o).longValue();
}
if (o instanceof Character) {
return ((Character) o).charValue();
}
if (o instanceof Byte) {
return ((Byte) o).longValue();
}
if (o instanceof UnsignedValue) {
Object u = ((UnsignedValue) o).value();
if (u instanceof Integer) {
return Integer.toUnsignedLong(((Integer) u));
}
if (u instanceof Short) {
return Short.toUnsignedLong(((Short) u));
}
if (u instanceof Byte) {
return Byte.toUnsignedLong(((Byte) u));
}
}
throw newIllegalArgumentException(name, "long");
}
/**
* Returns the value of a field of type {@code double} or of another primitive
* type that is convertible to type {@code double} by a widening conversion.
* <p>
* This method can be used on fields of the following types: {@code double}, {@code float},
* {@code long}, {@code int}, {@code short}, {@code char}, and {@code byte}.
* <p>
* It's possible to index into a nested object using {@code "."} (for example,
* {@code "aaa.bbb"}).
* <p>
* A field might change or be removed in a future JDK release. A best practice
* for callers of this method is to validate the field before attempting access.
*
* @param name of the field to get, not {@code null}
*
* @return the value of the field converted to type {@code double}
*
* @throws IllegalArgumentException if the field doesn't exist, or the field
* value can't be converted to the type {@code double} by a widening
* conversion
*
* @see #hasField(String)
* @set #getValue(String)
*/
public final double getDouble(String name) {
Object o = getValue(name);
if (o instanceof Double) {
return ((Double) o).doubleValue();
}
if (o instanceof Float) {
return ((Float) o).doubleValue();
}
if (o instanceof Long) {
return ((Long) o).doubleValue();
}
if (o instanceof Integer) {
return ((Integer) o).doubleValue();
}
if (o instanceof Short) {
return ((Short) o).doubleValue();
}
if (o instanceof Byte) {
return ((Byte) o).byteValue();
}
if (o instanceof Character) {
return ((Character) o).charValue();
}
throw newIllegalArgumentException(name, "double");
}
/**
* Returns the value of a field of type {@code String}.
* <p>
* It's possible to index into a nested object using {@code "."} (for example,
* {@code "foo.bar"}).
* <p>
* A field might change or be removed in a future JDK release. A best practice
* for callers of this method is to validate the field before attempting access.
*
* @param name of the field to get, not {@code null}
*
* @return the value of the field as a {@code String}, can be {@code null}
*
* @throws IllegalArgumentException if the field doesn't exist, or the field
* isn't of type {@code String}
*
* @see #hasField(String)
* @set #getValue(String)
*/
public final String getString(String name) {
return getTypedValue(name, "java.lang.String");
}
/**
* Returns the value of a timespan field.
* <p>
* This method can be used on fields annotated with {@code @Timespan}, and of
* the following types: {@code long}, {@code int}, {@code short}, {@code char},
* and {@code byte}.
* <p>
* It's possible to index into a nested object using {@code "."} (for example,
* {@code "aaa.bbb"}).
* <p>
* A field might change or be removed in a future JDK release. A best practice
* for callers of this method is to validate the field before attempting access.
*
* @param name of the field to get, not {@code null}
*
* @return a time span represented as a {@code Duration}, not {@code null}
*
* @throws IllegalArgumentException if the field doesn't exist, or the field
* value can't be converted to a {@code Duration} object
*
* @see #hasField(String)
* @set #getValue(String)
*/
public final Duration getDuration(String name) {
Object o = getValue(name);
if (o instanceof Long) {
return getDuration(((Long) o).longValue(), name);
}
if (o instanceof Integer) {
return getDuration(((Integer) o).longValue(), name);
}
if (o instanceof Short) {
return getDuration(((Short) o).longValue(), name);
}
if (o instanceof Character) {
return getDuration(((Character) o).charValue(), name);
}
if (o instanceof Byte) {
return getDuration(((Byte) o).longValue(), name);
}
if (o instanceof UnsignedValue) {
Object u = ((UnsignedValue) o).value();
if (u instanceof Integer) {
return getDuration(Integer.toUnsignedLong((Integer) u), name);
}
if (u instanceof Short) {
return getDuration(Short.toUnsignedLong((Short) u), name);
}
if (u instanceof Byte) {
return getDuration(Short.toUnsignedLong((Byte) u), name);
}
}
throw newIllegalArgumentException(name, "java,time.Duration");
}
private Duration getDuration(long timespan, String name) throws InternalError {
ValueDescriptor v = getValueDescriptor(objectContext.fields, name, null);
if (timespan == Long.MIN_VALUE) {
return Duration.ofSeconds(Long.MIN_VALUE, 0);
}
Timespan ts = v.getAnnotation(Timespan.class);
if (ts != null) {
switch (ts.value()) {
case Timespan.MICROSECONDS:
return Duration.ofNanos(1000 * timespan);
case Timespan.SECONDS:
return Duration.ofSeconds(timespan);
case Timespan.MILLISECONDS:
return Duration.ofMillis(timespan);
case Timespan.NANOSECONDS:
return Duration.ofNanos(timespan);
case Timespan.TICKS:
return Duration.ofNanos(objectContext.convertTimespan(timespan));
}
throw new IllegalArgumentException("Attempt to get " + v.getTypeName() + " field \"" + name + "\" with illegal timespan unit " + ts.value());
}
throw new IllegalArgumentException("Attempt to get " + v.getTypeName() + " field \"" + name + "\" with missing @Timespan");
}
/**
* Returns the value of a timestamp field.
* <p>
* This method can be used on fields annotated with {@code @Timestamp}, and of
* the following types: {@code long}, {@code int}, {@code short}, {@code char}
* and {@code byte}.
* <p>
* It's possible to index into a nested object using {@code "."} (for example,
* {@code "aaa.bbb"}).
* <p>
* A field might change or be removed in a future JDK release. A best practice
* for callers of this method is to validate the field before attempting access.
*
* @param name of the field to get, not {@code null}
*
* @return a timstamp represented as an {@code Instant}, not {@code null}
*
* @throws IllegalArgumentException if the field doesn't exist, or the field
* value can't be converted to an {@code Instant} object
*
* @see #hasField(String)
* @set #getValue(String)
*/
public final Instant getInstant(String name) {
Object o = getValue(name, true);
if (o instanceof Long) {
return getInstant(((Long) o).longValue(), name);
}
if (o instanceof Integer) {
return getInstant(((Integer) o).longValue(), name);
}
if (o instanceof Short) {
return getInstant(((Short) o).longValue(), name);
}
if (o instanceof Character) {
return getInstant(((Character) o).charValue(), name);
}
if (o instanceof Byte) {
return getInstant(((Byte) o).longValue(), name);
}
if (o instanceof UnsignedValue) {
Object u = ((UnsignedValue) o).value();
if (u instanceof Integer) {
return getInstant(Integer.toUnsignedLong((Integer) u), name);
}
if (u instanceof Short) {
return getInstant(Short.toUnsignedLong((Short) u), name);
}
if (u instanceof Byte) {
return getInstant(Short.toUnsignedLong((Byte) u), name);
}
}
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