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/*
* Copyright (c) 1997, 2021 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package com.oracle.webservices.api.message;
import com.sun.istack.NotNull;
import com.sun.istack.Nullable;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.AbstractMap;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;
/**
* A set of "properties" that can be accessed via strongly-typed fields
* as well as reflexibly through the property name.
*
* @author Kohsuke Kawaguchi
*/
@SuppressWarnings("SuspiciousMethodCalls")
public abstract class BasePropertySet implements PropertySet {
/**
* Creates a new instance of TypedMap.
*/
protected BasePropertySet() {
}
private Map mapView;
/**
* Represents the list of strongly-typed known properties
* (keyed by property names.)
*
*
* Just giving it an alias to make the use of this class more fool-proof.
*/
protected static class PropertyMap extends HashMap {
// the entries are often being iterated through so performance can be improved
// by their caching instead of iterating through the original (immutable) map each time
transient PropertyMapEntry[] cachedEntries = null;
PropertyMapEntry[] getPropertyMapEntries() {
if (cachedEntries == null) {
cachedEntries = createPropertyMapEntries();
}
return cachedEntries;
}
private PropertyMapEntry[] createPropertyMapEntries() {
final PropertyMapEntry[] modelEntries = new PropertyMapEntry[size()];
int i = 0;
for (final Entry e : entrySet()) {
modelEntries[i++] = new PropertyMapEntry(e.getKey(), e.getValue());
}
return modelEntries;
}
}
/**
* PropertyMapEntry represents a Map.Entry in the PropertyMap with more efficient access.
*/
static public class PropertyMapEntry {
public PropertyMapEntry(String k, Accessor v) {
key = k; value = v;
}
String key;
Accessor value;
}
/**
* Map representing the Fields and Methods annotated with {@link PropertySet.Property}.
* Model of {@link PropertySet} class.
*
*
* At the end of the derivation chain this method just needs to be implemented
* as:
*
*
* private static final PropertyMap model;
* static {
* model = parse(MyDerivedClass.class);
* }
* protected PropertyMap getPropertyMap() {
* return model;
* }
*
* or if the implementation is in different Java module.
*
* private static final PropertyMap model;
* static {
* model = parse(MyDerivedClass.class, MethodHandles.lookup());
* }
* protected PropertyMap getPropertyMap() {
* return model;
* }
*
* @return the map of strongly-typed known properties keyed by property names
*/
protected abstract PropertyMap getPropertyMap();
/**
* This method parses a class for fields and methods with {@link PropertySet.Property}.
*
* @param clazz Class to be parsed
* @return the map of strongly-typed known properties keyed by property names
* @see #parse(java.lang.Class, java.lang.invoke.MethodHandles.Lookup)
*/
protected static PropertyMap parse(final Class clazz) {
return parse(clazz, MethodHandles.lookup());
}
/**
* This method parses a class for fields and methods with {@link PropertySet.Property}.
*
* @param clazz Class to be parsed
* @param caller the caller lookup object
* @return the map of strongly-typed known properties keyed by property names
* @throws NullPointerException if {@code clazz} or {@code caller} is {@code null}
* @throws SecurityException if denied by the security manager
* @throws RuntimeException if any of the other access checks specified above fails
* @since 3.0.1
*/
protected static PropertyMap parse(final Class clazz, final MethodHandles.Lookup caller) {
Class cl = Objects.requireNonNull(clazz, "clazz must not be null");
MethodHandles.Lookup lookup = Objects.requireNonNull(caller, "caller must not be null");
try {
return AccessController.doPrivileged((PrivilegedExceptionAction) () -> {
PropertyMap props = new PropertyMap();
for (Class c = cl; c != Object.class; c = c.getSuperclass()) {
MethodHandles.Lookup privateLookup = AccessorFactory.createPrivateLookup(c, lookup);
for (Field f : c.getDeclaredFields()) {
Property cp = f.getAnnotation(Property.class);
if (cp != null) {
for (String value : cp.value()) {
props.put(value, AccessorFactory.createAccessor(f, value, privateLookup));
}
}
}
for (Method m : c.getDeclaredMethods()) {
Property cp = m.getAnnotation(Property.class);
if (cp != null) {
String name = m.getName();
assert name.startsWith("get") || name.startsWith("is");
String setName = name.startsWith("is")
? "set" + name.substring(2) // isFoo -> setFoo
: 's' + name.substring(1); // getFoo -> setFoo
Method setter;
try {
setter = cl.getMethod(setName, m.getReturnType());
} catch (NoSuchMethodException e) {
setter = null; // no setter
}
for (String value : cp.value()) {
props.put(value, AccessorFactory.createAccessor(m, setter, value, privateLookup));
}
}
}
}
return props;
});
} catch (PrivilegedActionException ex) {
Throwable t = ex.getCause();
// TODO9: use InaccessibleObjectException on JDK 9+ instead
throw new RuntimeException(t);
}
}
/**
* Represents a typed property defined on a {@link PropertySet}.
*/
protected interface Accessor {
String getName();
boolean hasValue(PropertySet props);
Object get(PropertySet props);
void set(PropertySet props, Object value);
}
static final class FieldAccessor implements Accessor {
/**
* Field with the annotation.
*/
private final Field f;
/**
* One of the values in {@link Property} annotation on {@link #f}.
*/
private final String name;
protected FieldAccessor(Field f, String name) {
this.f = f;
f.setAccessible(true);
this.name = name;
}
@Override
public String getName() {
return name;
}
@Override
public boolean hasValue(PropertySet props) {
return get(props)!=null;
}
@Override
public Object get(PropertySet props) {
try {
return f.get(props);
} catch (IllegalAccessException e) {
throw new AssertionError();
}
}
@Override
public void set(PropertySet props, Object value) {
try {
f.set(props,value);
} catch (IllegalAccessException e) {
throw new AssertionError();
}
}
}
static final class MethodAccessor implements Accessor {
/**
* Getter method.
*/
private final @NotNull Method getter;
/**
* Setter method.
* Some property is read-only.
*/
private final @Nullable Method setter;
/**
* One of the values in {@link Property} annotation on {@link #getter}.
*/
private final String name;
protected MethodAccessor(Method getter, Method setter, String value) {
this.getter = getter;
this.setter = setter;
this.name = value;
getter.setAccessible(true);
if (setter!=null) {
setter.setAccessible(true);
}
}
@Override
public String getName() {
return name;
}
@Override
public boolean hasValue(PropertySet props) {
return get(props)!=null;
}
@Override
public Object get(PropertySet props) {
try {
return getter.invoke(props);
} catch (IllegalAccessException e) {
throw new AssertionError();
} catch (InvocationTargetException e) {
handle(e);
return 0; // never reach here
}
}
@Override
public void set(PropertySet props, Object value) {
if(setter==null) {
throw new ReadOnlyPropertyException(getName());
}
try {
setter.invoke(props,value);
} catch (IllegalAccessException e) {
throw new AssertionError();
} catch (InvocationTargetException e) {
handle(e);
}
}
/**
* Since we don't expect the getter/setter to throw a checked exception,
* it should be possible to make the exception propagation transparent.
* That's what we are trying to do here.
*/
private Exception handle(InvocationTargetException e) {
Throwable t = e.getTargetException();
if (t instanceof Error) {
throw (Error)t;
}
if (t instanceof RuntimeException) {
throw (RuntimeException)t;
}
throw new Error(e);
}
}
/**
* Class allowing to work with PropertySet object as with a Map; it doesn't only allow to read properties from
* the map but also to modify the map in a way it is in sync with original strongly typed fields. It also allows
* (if necessary) to store additional properties those can't be found in strongly typed fields.
*
* @see com.sun.xml.ws.api.PropertySet#asMap() method
*/
final class MapView extends HashMap {
// flag if it should allow store also different properties
// than the from strongly typed fields
boolean extensible;
MapView(boolean extensible) {
super(getPropertyMap().getPropertyMapEntries().length);
this.extensible = extensible;
initialize();
}
public void initialize() {
// iterate (cached) array instead of map to speed things up ...
PropertyMapEntry[] entries = getPropertyMap().getPropertyMapEntries();
for (PropertyMapEntry entry : entries) {
super.put(entry.key, entry.value);
}
}
@Override
public Object get(Object key) {
Object o = super.get(key);
if (o instanceof Accessor) {
return ((Accessor) o).get(BasePropertySet.this);
} else {
return o;
}
}
@Override
public Set> entrySet() {
Set> entries = new HashSet>();
for (String key : keySet()) {
entries.add(new SimpleImmutableEntry(key, get(key)));
}
return entries;
}
@Override
public Object put(String key, Object value) {
Object o = super.get(key);
if (o != null && o instanceof Accessor) {
Object oldValue = ((Accessor) o).get(BasePropertySet.this);
((Accessor) o).set(BasePropertySet.this, value);
return oldValue;
} else {
if (extensible) {
return super.put(key, value);
} else {
throw new IllegalStateException("Unknown property [" + key + "] for PropertySet [" +
BasePropertySet.this.getClass().getName() + "]");
}
}
}
@Override
public void clear() {
for (String key : keySet()) {
remove(key);
}
}
@Override
public Object remove(Object key) {
Object o;
o = super.get(key);
if (o instanceof Accessor) {
((Accessor)o).set(BasePropertySet.this, null);
}
return super.remove(key);
}
}
@Override
public boolean containsKey(Object key) {
Accessor sp = getPropertyMap().get(key);
if (sp != null) {
return sp.get(this) != null;
}
return false;
}
/**
* Gets the name of the property.
*
* @param key
* This field is typed as {@link Object} to follow the {@link Map#get(Object)}
* convention, but if anything but {@link String} is passed, this method
* just returns null.
*/
@Override
public Object get(Object key) {
Accessor sp = getPropertyMap().get(key);
if (sp != null) {
return sp.get(this);
}
throw new IllegalArgumentException("Undefined property "+key);
}
/**
* Sets a property.
*
*
* Implementation Note
*
* This method is slow. Code inside JAX-WS should define strongly-typed
* fields in this class and access them directly, instead of using this.
*
* @throws ReadOnlyPropertyException
* if the given key is an alias of a strongly-typed field,
* and if the name object given is not assignable to the field.
*
* @see Property
*/
@Override
public Object put(String key, Object value) {
Accessor sp = getPropertyMap().get(key);
if(sp!=null) {
Object old = sp.get(this);
sp.set(this,value);
return old;
} else {
throw new IllegalArgumentException("Undefined property "+key);
}
}
/**
* Checks if this {@link PropertySet} supports a property of the given name.
*/
@Override
public boolean supports(Object key) {
return getPropertyMap().containsKey(key);
}
@Override
public Object remove(Object key) {
Accessor sp = getPropertyMap().get(key);
if(sp!=null) {
Object old = sp.get(this);
sp.set(this,null);
return old;
} else {
throw new IllegalArgumentException("Undefined property "+key);
}
}
/**
* Creates a {@link Map} view of this {@link PropertySet}.
*
*
* This map is partially live, in the sense that values you set to it
* will be reflected to {@link PropertySet}.
*
*
* However, this map may not pick up changes made
* to {@link PropertySet} after the view is created.
*
* @deprecated use newer implementation {@link PropertySet#asMap()} which produces
* readwrite {@link Map}
*
* @return
* always non-null valid instance.
*/
@Deprecated
@Override
public final Map createMapView() {
final Set> core = new HashSet>();
createEntrySet(core);
return new AbstractMap() {
@Override
public Set> entrySet() {
return core;
}
};
}
/**
* Creates a modifiable {@link Map} view of this {@link PropertySet}.
*
* Changes done on this {@link Map} or on {@link PropertySet} object work in both directions - values made to
* {@link Map} are reflected to {@link PropertySet} and changes done using getters/setters on {@link PropertySet}
* object are automatically reflected in this {@link Map}.
*
* If necessary, it also can hold other values (not present on {@link PropertySet}) -
* see {@link BasePropertySet#mapAllowsAdditionalProperties()}
*
* @return always non-null valid instance.
*/
@Override
public Map asMap() {
if (mapView == null) {
mapView = createView();
}
return mapView;
}
protected Map createView() {
return new MapView(mapAllowsAdditionalProperties());
}
/**
* Used when constructing the {@link MapView} for this object - it controls if the {@link MapView} servers only to
* access strongly typed values or allows also different values
*
* @return true if {@link Map} should allow also properties not defined as strongly typed fields
*/
protected boolean mapAllowsAdditionalProperties() {
return false;
}
protected void createEntrySet(Set> core) {
for (final Entry e : getPropertyMap().entrySet()) {
core.add(new Entry() {
@Override
public String getKey() {
return e.getKey();
}
@Override
public Object getValue() {
return e.getValue().get(BasePropertySet.this);
}
@Override
public Object setValue(Object value) {
Accessor acc = e.getValue();
Object old = acc.get(BasePropertySet.this);
acc.set(BasePropertySet.this,value);
return old;
}
});
}
}
}