Source Code Cross Referenced for ChainedClosure.java in  » Library » Apache-common-Collections » org » apache » commons » collections » functors » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache common Collections » org.apache.commons.collections.functors 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Copyright 2001-2004 The Apache Software Foundation
003:         *
004:         *  Licensed under the Apache License, Version 2.0 (the "License");
005:         *  you may not use this file except in compliance with the License.
006:         *  You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         *  Unless required by applicable law or agreed to in writing, software
011:         *  distributed under the License is distributed on an "AS IS" BASIS,
012:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         *  See the License for the specific language governing permissions and
014:         *  limitations under the License.
015:         */
016:        package org.apache.commons.collections.functors;
017:
018:        import java.io.Serializable;
019:        import java.util.Collection;
020:        import java.util.Iterator;
021:
022:        import org.apache.commons.collections.Closure;
023:
024:        /**
025:         * Closure implementation that chains the specified closures together.
026:         * 
027:         * @since Commons Collections 3.0
028:         * @version $Revision: 348444 $ $Date: 2005-11-23 14:06:56 +0000 (Wed, 23 Nov 2005) $
029:         *
030:         * @author Stephen Colebourne
031:         */
032:        public class ChainedClosure implements  Closure, Serializable {
033:
034:            /** Serial version UID */
035:            private static final long serialVersionUID = -3520677225766901240L;
036:
037:            /** The closures to call in turn */
038:            private final Closure[] iClosures;
039:
040:            /**
041:             * Factory method that performs validation and copies the parameter array.
042:             * 
043:             * @param closures  the closures to chain, copied, no nulls
044:             * @return the <code>chained</code> closure
045:             * @throws IllegalArgumentException if the closures array is null
046:             * @throws IllegalArgumentException if any closure in the array is null
047:             */
048:            public static Closure getInstance(Closure[] closures) {
049:                FunctorUtils.validate(closures);
050:                if (closures.length == 0) {
051:                    return NOPClosure.INSTANCE;
052:                }
053:                closures = FunctorUtils.copy(closures);
054:                return new ChainedClosure(closures);
055:            }
056:
057:            /**
058:             * Create a new Closure that calls each closure in turn, passing the 
059:             * result into the next closure. The ordering is that of the iterator()
060:             * method on the collection.
061:             * 
062:             * @param closures  a collection of closures to chain
063:             * @return the <code>chained</code> closure
064:             * @throws IllegalArgumentException if the closures collection is null
065:             * @throws IllegalArgumentException if any closure in the collection is null
066:             */
067:            public static Closure getInstance(Collection closures) {
068:                if (closures == null) {
069:                    throw new IllegalArgumentException(
070:                            "Closure collection must not be null");
071:                }
072:                if (closures.size() == 0) {
073:                    return NOPClosure.INSTANCE;
074:                }
075:                // convert to array like this to guarantee iterator() ordering
076:                Closure[] cmds = new Closure[closures.size()];
077:                int i = 0;
078:                for (Iterator it = closures.iterator(); it.hasNext();) {
079:                    cmds[i++] = (Closure) it.next();
080:                }
081:                FunctorUtils.validate(cmds);
082:                return new ChainedClosure(cmds);
083:            }
084:
085:            /**
086:             * Factory method that performs validation.
087:             * 
088:             * @param closure1  the first closure, not null
089:             * @param closure2  the second closure, not null
090:             * @return the <code>chained</code> closure
091:             * @throws IllegalArgumentException if either closure is null
092:             */
093:            public static Closure getInstance(Closure closure1, Closure closure2) {
094:                if (closure1 == null || closure2 == null) {
095:                    throw new IllegalArgumentException(
096:                            "Closures must not be null");
097:                }
098:                Closure[] closures = new Closure[] { closure1, closure2 };
099:                return new ChainedClosure(closures);
100:            }
101:
102:            /**
103:             * Constructor that performs no validation.
104:             * Use <code>getInstance</code> if you want that.
105:             * 
106:             * @param closures  the closures to chain, not copied, no nulls
107:             */
108:            public ChainedClosure(Closure[] closures) {
109:                super ();
110:                iClosures = closures;
111:            }
112:
113:            /**
114:             * Execute a list of closures.
115:             * 
116:             * @param input  the input object passed to each closure
117:             */
118:            public void execute(Object input) {
119:                for (int i = 0; i < iClosures.length; i++) {
120:                    iClosures[i].execute(input);
121:                }
122:            }
123:
124:            /**
125:             * Gets the closures, do not modify the array.
126:             * @return the closures
127:             * @since Commons Collections 3.1
128:             */
129:            public Closure[] getClosures() {
130:                return iClosures;
131:            }
132:
133:        }
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