001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.xbean.naming.context;
018
019import java.util.Collections;
020import java.util.HashMap;
021import java.util.Map;
022
023import javax.naming.Context;
024import javax.naming.Name;
025import javax.naming.NamingException;
026import javax.naming.OperationNotSupportedException;
027
028import org.apache.xbean.naming.reference.CachingReference;
029
030/**
031 *
032 * @version $Rev: 417891 $ $Date: 2006-06-28 15:45:07 -0700 (Wed, 28 Jun 2006) $
033 */
034public class ImmutableContext extends AbstractContext {
035    private final Map<String, Object> localBindings;
036    private final Map<String, Object> absoluteIndex;
037
038    public ImmutableContext(Map<String, Object> bindings) throws NamingException {
039        this("", bindings, true);
040    }
041
042    public ImmutableContext(Map<String, Object> bindings, boolean cacheReferences) throws NamingException {
043        this("", bindings, cacheReferences);
044    }
045
046    public ImmutableContext(String nameInNamespace, Map<String, Object> bindings, boolean cacheReferences) throws NamingException {
047        super(nameInNamespace, ContextAccess.UNMODIFIABLE);
048
049        if (cacheReferences) {
050            bindings = CachingReference.wrapReferences(bindings, this);
051        }
052
053        Map<String, Object> localBindings = ContextUtil.createBindings(bindings, this);
054        this.localBindings = Collections.unmodifiableMap(localBindings);
055
056        Map<String, Object> globalBindings = ImmutableContext.buildAbsoluteIndex("", localBindings);
057        this.absoluteIndex = Collections.unmodifiableMap(globalBindings);
058    }
059
060    private static Map<String, Object> buildAbsoluteIndex(String nameInNamespace, Map<String, Object> bindings) {
061        String path = nameInNamespace;
062        if (path.length() > 0) {
063            path += "/";
064        }
065
066        Map<String, Object> globalBindings = new HashMap<String, Object>();
067        for (Map.Entry<String, Object> entry : bindings.entrySet()) {
068            String name = entry.getKey();
069            Object value = entry.getValue();
070            if (value instanceof NestedImmutableContext) {
071                NestedImmutableContext nestedContext = (NestedImmutableContext) value;
072                globalBindings.putAll(ImmutableContext.buildAbsoluteIndex(nestedContext.getNameInNamespace(), nestedContext.localBindings));
073            }
074            globalBindings.put(path + name, value);
075        }
076        return globalBindings;
077    }
078
079    protected Object getDeepBinding(String name) {
080        return absoluteIndex.get(name);
081    }
082
083    protected Map<String, Object> getBindings() {
084        return localBindings;
085    }
086
087    protected final void addDeepBinding(String name, Object value, boolean createIntermediateContexts) throws NamingException {
088        throw new OperationNotSupportedException("Context is immutable");
089    }
090
091    protected final boolean addBinding(String name, Object value, boolean rebind) throws NamingException {
092        throw new OperationNotSupportedException("Context is immutable");
093    }
094
095    protected final void removeDeepBinding(Name name, boolean pruneEmptyContexts) throws NamingException {
096        throw new OperationNotSupportedException("Context is immutable");
097    }
098
099    protected final boolean removeBinding(String name, boolean removeNotEmptyContext) throws NamingException {
100        throw new OperationNotSupportedException("Context is immutable");
101    }
102
103    public boolean isNestedSubcontext(Object value) {
104        if (value instanceof NestedImmutableContext) {
105            NestedImmutableContext context = (NestedImmutableContext) value;
106            return this == context.getImmutableContext();
107        }
108        return false;
109    }
110
111    public Context createNestedSubcontext(String path, Map bindings) {
112        return new NestedImmutableContext(path, bindings);
113    }
114
115    /**
116     * Nested context which shares the absolute index map in MapContext.
117     */
118    public final class NestedImmutableContext extends AbstractContext {
119        private final Map<String, Object> localBindings;
120        private final String pathWithSlash;
121
122        public NestedImmutableContext(String path, Map<String, Object> bindings) {
123            super(ImmutableContext.this.getNameInNamespace(path), ContextAccess.UNMODIFIABLE);
124
125            path = getNameInNamespace();
126            if (!path.endsWith("/")) path += "/";
127            this.pathWithSlash = path;
128
129            this.localBindings = Collections.unmodifiableMap(bindings);
130        }
131
132        protected Object getDeepBinding(String name) {
133            String absoluteName = pathWithSlash + name;
134            return absoluteIndex.get(absoluteName);
135        }
136
137        protected Map<String, Object> getBindings() {
138            return localBindings;
139        }
140
141        protected final void addDeepBinding(String name, Object value, boolean createIntermediateContexts) throws NamingException {
142            throw new OperationNotSupportedException("Context is immutable");
143        }
144
145        protected final boolean addBinding(String name, Object value, boolean rebind) throws NamingException {
146            throw new OperationNotSupportedException("Context is immutable");
147        }
148
149        protected final void removeDeepBinding(Name name, boolean pruneEmptyContexts) throws NamingException {
150            throw new OperationNotSupportedException("Context is immutable");
151        }
152
153        protected final boolean removeBinding(String name, boolean removeNotEmptyContext) throws NamingException {
154            throw new OperationNotSupportedException("Context is immutable");
155        }
156
157        public boolean isNestedSubcontext(Object value) {
158            if (value instanceof NestedImmutableContext) {
159                NestedImmutableContext context = (NestedImmutableContext) value;
160                return getImmutableContext() == context.getImmutableContext();
161            }
162            return false;
163        }
164
165        public Context createNestedSubcontext(String path, Map<String, Object> bindings) {
166            return new NestedImmutableContext(path, bindings);
167        }
168
169        protected ImmutableContext getImmutableContext() {
170            return ImmutableContext.this;
171        }
172    }
173}