Source Code Cross Referenced for FormatableHashtable.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » iapi » services » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.iapi.services.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:           Derby - Class org.apache.derby.iapi.services.io.FormatableHashtable
004:
005:           Licensed to the Apache Software Foundation (ASF) under one or more
006:           contributor license agreements.  See the NOTICE file distributed with
007:           this work for additional information regarding copyright ownership.
008:           The ASF licenses this file to you under the Apache License, Version 2.0
009:           (the "License"); you may not use this file except in compliance with
010:           the License.  You may obtain a copy of the License at
011:
012:              http://www.apache.org/licenses/LICENSE-2.0
013:
014:           Unless required by applicable law or agreed to in writing, software
015:           distributed under the License is distributed on an "AS IS" BASIS,
016:           WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017:           See the License for the specific language governing permissions and
018:           limitations under the License.
019:
020:         */
021:
022:        package org.apache.derby.iapi.services.io;
023:
024:        import org.apache.derby.iapi.services.io.ArrayInputStream;
025:
026:        import org.apache.derby.iapi.services.io.StoredFormatIds;
027:        import org.apache.derby.iapi.services.io.FormatIdUtil;
028:        import org.apache.derby.iapi.services.io.Formatable;
029:        import org.apache.derby.iapi.services.sanity.SanityManager;
030:
031:        import java.util.Hashtable;
032:        import java.util.Enumeration;
033:        import java.io.ObjectOutput;
034:        import java.io.ObjectInput;
035:        import java.io.IOException;
036:
037:        /**
038:         * A formatable holder for a java.util.Hashtable.
039:         * Used to avoid serializing Properties.
040:         */
041:        public class FormatableHashtable extends Hashtable implements 
042:                Formatable {
043:            /********************************************************
044:             **
045:             **	This class implements Formatable. That means that it
046:             **	can write itself to and from a formatted stream. If
047:             **	you add more fields to this class, make sure that you
048:             **	also write/read them with the writeExternal()/readExternal()
049:             **	methods.
050:             **
051:             **	If, inbetween releases, you add more fields to this class,
052:             **	then you should bump the version number emitted by the getTypeFormatId()
053:             **	method.
054:             **
055:             ********************************************************/
056:
057:            /**
058:             * Niladic constructor for formatable
059:             */
060:            public FormatableHashtable() {
061:            }
062:
063:            /**
064:             * Our special put method that wont barf
065:             * on a null value.
066:             * @see java.util.Hashtable
067:             */
068:            public Object put(Object key, Object value) {
069:                if (value == null) {
070:                    return remove(key);
071:                }
072:
073:                if (SanityManager.DEBUG) {
074:
075:                    if ((value instanceof  FormatableIntHolder)
076:                            || (value instanceof  FormatableLongHolder)
077:                            || ((value instanceof  java.io.Serializable)
078:                                    && (!(value instanceof  Formatable)) && (!(value instanceof  String)))) {
079:
080:                        if (!value.getClass().isArray()) {
081:
082:                            // System.out.println("key " + key + " class " + value.getClass());
083:                            //new Throwable().printStackTrace(System.out);
084:                            //System.exit(1);
085:                        }
086:                    }
087:                }
088:                return super .put(key, value);
089:            }
090:
091:            public void putInt(Object key, int value) {
092:
093:                super .put(key, new FormatableIntHolder(value));
094:            }
095:
096:            public int getInt(Object key) {
097:
098:                return ((FormatableIntHolder) get(key)).getInt();
099:            }
100:
101:            public void putLong(Object key, long value) {
102:
103:                super .put(key, new FormatableLongHolder(value));
104:            }
105:
106:            public long getLong(Object key) {
107:
108:                return ((FormatableLongHolder) get(key)).getLong();
109:            }
110:
111:            public void putBoolean(Object key, boolean value) {
112:
113:                putInt(key, value ? 1 : 0);
114:            }
115:
116:            public boolean getBoolean(Object key) {
117:
118:                return getInt(key) == 0 ? false : true;
119:
120:            }
121:
122:            //////////////////////////////////////////////
123:            //
124:            // FORMATABLE
125:            //
126:            //////////////////////////////////////////////
127:            /**
128:             * Write the hash table out.  Step through
129:             * the enumeration and write the strings out
130:             * in UTF.
131:             *
132:             * @param out write bytes here
133:             *
134:             * @exception IOException thrown on error
135:             */
136:            public void writeExternal(ObjectOutput out) throws IOException {
137:                out.writeInt(size());
138:                for (Enumeration e = keys(); e.hasMoreElements();) {
139:                    Object key = e.nextElement();
140:                    out.writeObject(key);
141:                    out.writeObject(get(key));
142:
143:                    if (SanityManager.DEBUG) {
144:                        Object value = get(key);
145:                        if (value instanceof  Formatable[]) {
146:                            SanityManager
147:                                    .THROWASSERT("you should be using FormatableArrayHolder rather than writing out an array of Formatables, otherwise you will get bad behavior for null Storables.  Your class is a "
148:                                            + value.getClass().getName());
149:                        }
150:                    }
151:                }
152:            }
153:
154:            /**
155:             * Read the hash table from a stream of stored objects.
156:             *
157:             * @param in read this.
158:             *
159:             * @exception IOException					thrown on error
160:             * @exception ClassNotFoundException		thrown on error
161:             */
162:            public void readExternal(ObjectInput in) throws IOException,
163:                    ClassNotFoundException {
164:                int size = in.readInt();
165:                for (; size > 0; size--) {
166:                    super .put(in.readObject(), in.readObject());
167:                }
168:            }
169:
170:            public void readExternal(ArrayInputStream in) throws IOException,
171:                    ClassNotFoundException {
172:                int size = in.readInt();
173:                for (; size > 0; size--) {
174:                    super .put(in.readObject(), in.readObject());
175:                }
176:            }
177:
178:            /**
179:             * Get the formatID which corresponds to this class.
180:             *
181:             *	@return	the formatID of this class
182:             */
183:            public int getTypeFormatId() {
184:                return StoredFormatIds.FORMATABLE_HASHTABLE_V01_ID;
185:            }
186:        }
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