Source Code Cross Referenced for MethodKey.java in  » Scripting » groovy-1.0 » org » codehaus » groovy » runtime » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » groovy 1.0 » org.codehaus.groovy.runtime 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: MethodKey.java 4661 2007-01-02 16:52:26Z blackdrag $
003:         *
004:         * Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
005:         *
006:         * Redistribution and use of this software and associated documentation
007:         * ("Software"), with or without modification, are permitted provided that the
008:         * following conditions are met:
009:         *  1. Redistributions of source code must retain copyright statements and
010:         * notices. Redistributions must also contain a copy of this document.
011:         *  2. Redistributions in binary form must reproduce the above copyright
012:         * notice, this list of conditions and the following disclaimer in the
013:         * documentation and/or other materials provided with the distribution.
014:         *  3. The name "groovy" must not be used to endorse or promote products
015:         * derived from this Software without prior written permission of The Codehaus.
016:         * For written permission, please contact info@codehaus.org.
017:         *  4. Products derived from this Software may not be called "groovy" nor may
018:         * "groovy" appear in their names without prior written permission of The
019:         * Codehaus. "groovy" is a registered trademark of The Codehaus.
020:         *  5. Due credit should be given to The Codehaus - http://groovy.codehaus.org/
021:         *
022:         * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY
023:         * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
024:         * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
025:         * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR
026:         * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
027:         * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
028:         * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
029:         * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
030:         * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
031:         * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
032:         * DAMAGE.
033:         *
034:         */
035:        package org.codehaus.groovy.runtime;
036:
037:        import java.util.ArrayList;
038:        import java.util.Collections;
039:        import java.util.List;
040:
041:        /**
042:         * An abstract base class for a key used for comparators and Map keys to lookup a method by
043:         * name and parameter types
044:         * 
045:         * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
046:         * @version $Revision: 4661 $
047:         */
048:        public abstract class MethodKey {
049:
050:            private int hash;
051:            private String name;
052:            private Class sender;
053:            private boolean isCallToSuper;
054:
055:            public MethodKey(Class sender, String name, boolean isCallToSuper) {
056:                this .sender = sender;
057:                this .name = name;
058:                this .isCallToSuper = isCallToSuper;
059:            }
060:
061:            /**
062:             * Creates an immutable copy that we can cache. 
063:             */
064:            public MethodKey createCopy() {
065:                int size = getParameterCount();
066:                Class[] paramTypes = new Class[size];
067:                for (int i = 0; i < size; i++) {
068:                    paramTypes[i] = getParameterType(i);
069:                }
070:                return new DefaultMethodKey(sender, name, paramTypes,
071:                        isCallToSuper);
072:            }
073:
074:            public boolean equals(Object that) {
075:                if (this  == that) {
076:                    return true;
077:                } else if (hashCode() == that.hashCode()
078:                        && that instanceof  MethodKey) {
079:                    return equals((MethodKey) that);
080:                }
081:                return false;
082:            }
083:
084:            public boolean equals(MethodKey that) {
085:                int size = getParameterCount();
086:                if (sender != that.sender)
087:                    return false;
088:                if (isCallToSuper != that.isCallToSuper)
089:                    return false;
090:                if (name.equals(that.name) && size == that.getParameterCount()) {
091:                    for (int i = 0; i < size; i++) {
092:                        if (!getParameterType(i).equals(
093:                                that.getParameterType(i))) {
094:                            return false;
095:                        }
096:                    }
097:                    return true;
098:                }
099:                return false;
100:            }
101:
102:            public int hashCode() {
103:                if (hash == 0) {
104:                    hash = createHashCode();
105:                    if (hash == 0) {
106:                        hash = 0xcafebabe;
107:                    }
108:                }
109:                return hash;
110:            }
111:
112:            public String toString() {
113:                return super .toString() + "[name:" + name + "; params:"
114:                        + getParamterTypes();
115:            }
116:
117:            public String getName() {
118:                return name;
119:            }
120:
121:            public List getParamterTypes() {
122:                int size = getParameterCount();
123:                if (size <= 0) {
124:                    return Collections.EMPTY_LIST;
125:                }
126:                List params = new ArrayList(size);
127:                for (int i = 0; i < size; i++) {
128:                    params.add(getParameterType(i));
129:                }
130:                return params;
131:            }
132:
133:            public abstract int getParameterCount();
134:
135:            public abstract Class getParameterType(int index);
136:
137:            protected int createHashCode() {
138:                int answer = name.hashCode();
139:                int size = getParameterCount();
140:
141:                /** @todo we should use the real Josh Bloch algorithm here */
142:
143:                // can't remember the exact Josh Bloch algorithm and I've not got the book handy
144:                // but its something like this IIRC
145:                for (int i = 0; i < size; i++) {
146:                    answer *= 37;
147:                    answer += 1 + getParameterType(i).hashCode();
148:                }
149:                answer *= 37;
150:                answer += isCallToSuper ? 1 : 0;
151:                answer *= 37;
152:                answer += 1 + sender.hashCode();
153:                return answer;
154:            }
155:        }
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