/*
* Copyright (c) 2005, 2006, 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.
*
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package com.sun.xml.internal.ws.api;
import com.sun.istack.internal.NotNull;
import com.sun.istack.internal.Nullable;
import com.sun.xml.internal.ws.api.message.Packet;
import com.sun.xml.internal.ws.util.ReadOnlyPropertyException;
import javax.xml.ws.handler.MessageContext;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.AbstractMap;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Map.Entry;
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 PropertySet {
/**
* Creates a new instance of TypedMap.
*/
protected PropertySet() {}
/**
* Marks a field on {@link PropertySet} as a
* property of {@link MessageContext}.
*
* <p>
* To make the runtime processing easy, this annotation
* must be on a public field (since the property name
* can be set through {@link Map} anyway, you won't be
* losing abstraction by doing so.)
*
* <p>
* For similar reason, this annotation can be only placed
* on a reference type, not primitive type.
*
* @see Packet
* @author Kohsuke Kawaguchi
*/
@Inherited
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD,ElementType.METHOD})
public @interface Property {
/**
* Name of the property.
*/
String[] value();
}
/**
* Represents the list of strongly-typed known propertyies
* (keyed by property names.)
*
* <p>
* Just giving it an alias to make the use of this class more fool-proof.
*/
protected static final class PropertyMap extends HashMap<String,Accessor> {}
/**
* Map representing the Fields and Methods annotated with {@link Property}.
* Model of {@link PropertySet} class.
*
* <p>
* At the end of the derivation chain this method just needs to be implemented
* as:
*
* <pre>
* private static final PropertyMap model;
* static {
* model = parse(MyDerivedClass.class);
* }
* protected PropertyMap getPropertyMap() {
* return model;
* }
* </pre>
*/
protected abstract PropertyMap getPropertyMap();
// maybe we can use this some time
///**
// * If all the properties defined on this {@link PropertySet} has a certain prefix
// * (such as, say, "javax.xml.ws.http."), then return it.
// *
// * <p>
// * Returning a non-null name from this method allows methods like
// * {@link #get(Object)} and {@link #put(String, Object)} to work faster.
// * This is especially so with {@link DistributedPropertySet}, so implementations
// * are encouraged to set a common prefix, as much as possible.
// *
// * <p>
// * Currently, this is used only by {@link DistributedPropertySet}.
// *
// * @return
// * Null if no such common prefix exists. Otherwise string like
// * "javax.xml.ws.http." (the dot at the last is usually preferrable,
// * so that properties like "javax.xml.ws.https.something" won't match.
// */
//protected abstract String getPropertyPrefix();
/**
* This method parses a class for fields and methods with {@link Property}.
*/
protected static PropertyMap parse(final Class clazz) {
// make all relevant fields and methods accessible.
// this allows runtime to skip the security check, so they runs faster.
return AccessController.doPrivileged(new PrivilegedAction<PropertyMap>() {
public PropertyMap run() {
PropertyMap props = new PropertyMap();
for( Class c=clazz; c!=null; c=c.getSuperclass()) {
for (Field f : c.getDeclaredFields()) {
Property cp = f.getAnnotation(Property.class);
if(cp!=null) {
for(String value : cp.value()) {
props.put(value, new FieldAccessor(f, value));
}
}
}
for (Method m : c.getDeclaredMethods()) {
Property cp = m.getAnnotation(Property.class);
if(cp!=null) {
String name = m.getName();
assert name.startsWith("get");
String setName = 's'+name.substring(1); // getFoo -> setFoo
Method setter;
try {
setter = clazz.getMethod(setName,m.getReturnType());
} catch (NoSuchMethodException e) {
setter = null; // no setter
}
for(String value : cp.value()) {
props.put(value, new MethodAccessor(m, setter, value));
}
}
}
}
return props;
}
});
}
/**
* 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;
}
public String getName() {
return name;
}
public boolean hasValue(PropertySet props) {
return get(props)!=null;
}
public Object get(PropertySet props) {
try {
return f.get(props);
} catch (IllegalAccessException e) {
throw new AssertionError();
}
}
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);
}
public String getName() {
return name;
}
public boolean hasValue(PropertySet props) {
return get(props)!=null;
}
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
}
}
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);
}
}
public final boolean containsKey(Object key) {
return get(key)!=null;
}
/**
* 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.
*/
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.
*
* <h3>Implementation Note</h3>
* 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
*/
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.
*/
public boolean supports(Object key) {
return getPropertyMap().containsKey(key);
}
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);
}
}
/**
* Lazily created view of {@link Property}s that
* forms the core of {@link #createMapView()}.
*/
/*package*/ Set<Entry<String,Object>> mapViewCore;
/**
* Creates a {@link Map} view of this {@link PropertySet}.
*
* <p>
* This map is partially live, in the sense that values you set to it
* will be reflected to {@link PropertySet}.
*
* <p>
* However, this map may not pick up changes made
* to {@link PropertySet} after the view is created.
*
* @return
* always non-null valid instance.
*/
public final Map<String,Object> createMapView() {
final Set<Entry<String,Object>> core = new HashSet<Entry<String,Object>>();
createEntrySet(core);
return new AbstractMap<String, Object>() {
public Set<Entry<String,Object>> entrySet() {
return core;
}
};
}
/*package*/ void createEntrySet(Set<Entry<String,Object>> core) {
for (final Entry<String, Accessor> e : getPropertyMap().entrySet()) {
core.add(new Entry<String, Object>() {
public String getKey() {
return e.getKey();
}
public Object getValue() {
return e.getValue().get(PropertySet.this);
}
public Object setValue(Object value) {
Accessor acc = e.getValue();
Object old = acc.get(PropertySet.this);
acc.set(PropertySet.this,value);
return old;
}
});
}
}
}