Source Code Cross Referenced for FlatFileEntityIterable.java in  » Testing » databene-benerator » org » databene » platform » flat » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » databene benerator » org.databene.platform.flat 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * (c) Copyright 2007 by Volker Bergmann. All rights reserved.
003:         *
004:         * Redistribution and use in source and binary forms, with or without
005:         * modification, is permitted under the terms of the
006:         * GNU General Public License.
007:         *
008:         * For redistributing this software or a derivative work under a license other
009:         * than the GPL-compatible Free Software License as defined by the Free
010:         * Software Foundation or approved by OSI, you must first obtain a commercial
011:         * license to this software product from Volker Bergmann.
012:         *
013:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
014:         * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
015:         * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
016:         * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
017:         * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
018:         * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
019:         * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
020:         * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
021:         * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
022:         * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
023:         * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
024:         * POSSIBILITY OF SUCH DAMAGE.
025:         */
026:
027:        package org.databene.platform.flat;
028:
029:        import org.databene.platform.array.Array2EntityConverter;
030:        import org.databene.platform.bean.ArrayPropertyExtractor;
031:        import org.databene.model.data.EntityIterable;
032:        import org.databene.model.data.Entity;
033:        import org.databene.model.data.EntityDescriptor;
034:        import org.databene.document.flat.FlatFileColumnDescriptor;
035:        import org.databene.document.flat.FlatFileLineIterable;
036:        import org.databene.document.flat.FlatFileUtil;
037:        import org.databene.commons.Converter;
038:        import org.databene.commons.SystemInfo;
039:        import org.databene.commons.converter.ArrayConverter;
040:        import org.databene.commons.converter.ConverterChain;
041:        import org.databene.commons.converter.ConvertingIterable;
042:        import org.databene.commons.converter.NoOpConverter;
043:        import org.databene.commons.format.PadFormat;
044:
045:        import java.util.Iterator;
046:
047:        /**
048:         * Reads Entities from a flat file.<br/>
049:         * <br/>
050:         * Created: 26.08.2007 12:16:08
051:         * @author Volker Bergmann
052:         */
053:        public class FlatFileEntityIterable extends
054:                ConvertingIterable<String[], Entity> implements  EntityIterable {
055:
056:            private String uri;
057:            private String encoding;
058:            private EntityDescriptor entityDescriptor;
059:            private FlatFileColumnDescriptor[] descriptors;
060:            private boolean initialized;
061:
062:            private Converter<String, String> preprocessor;
063:
064:            public FlatFileEntityIterable() {
065:                this (null, null, SystemInfo.fileEncoding());
066:            }
067:
068:            public FlatFileEntityIterable(String uri,
069:                    EntityDescriptor entityDescriptor, String encoding,
070:                    FlatFileColumnDescriptor... descriptors) {
071:                this (uri, entityDescriptor, new NoOpConverter<String>(),
072:                        encoding, descriptors);
073:            }
074:
075:            public FlatFileEntityIterable(String uri,
076:                    EntityDescriptor entityDescriptor,
077:                    Converter<String, String> preprocessor, String encoding,
078:                    FlatFileColumnDescriptor... descriptors) {
079:                super (null, null);
080:                this .uri = uri;
081:                this .encoding = encoding;
082:                this .entityDescriptor = entityDescriptor;
083:                this .descriptors = descriptors;
084:                this .preprocessor = preprocessor;
085:                this .initialized = false;
086:            }
087:
088:            // properties ------------------------------------------------------------------------------------------------------
089:
090:            public void setUri(String uri) {
091:                this .uri = uri;
092:            }
093:
094:            public String getEntity() {
095:                return entityDescriptor.getName();
096:            }
097:
098:            public void setEntity(String entity) {
099:                this .entityDescriptor = new EntityDescriptor(entity, false); // TODO v0.5 finalize case handling
100:            }
101:
102:            public void setProperties(String properties) {
103:                this .descriptors = FlatFileUtil.parseProperties(properties);
104:            }
105:
106:            // Iterable interface ----------------------------------------------------------------------------------------------
107:
108:            public Iterator<Entity> iterator() {
109:                if (!initialized)
110:                    init();
111:                return super .iterator();
112:            }
113:
114:            // private helpers -------------------------------------------------------------------------------------------------
115:
116:            private void init() {
117:                this .iterable = createIterable(uri, descriptors, encoding);
118:                this .converter = createConverter(entityDescriptor, descriptors);
119:            }
120:
121:            private Converter<String[], Entity> createConverter(
122:                    EntityDescriptor entityDescriptor,
123:                    FlatFileColumnDescriptor[] descriptors) {
124:                String[] featureNames = ArrayPropertyExtractor.convert(
125:                        descriptors, "name", String.class);
126:                Array2EntityConverter<String> a2eConverter = new Array2EntityConverter<String>(
127:                        entityDescriptor, featureNames);
128:                Converter<String[], String[]> aConv = new ArrayConverter<String, String>(
129:                        String.class, preprocessor);
130:                Converter<String[], Entity> converter = new ConverterChain<String[], Entity>(
131:                        aConv, a2eConverter);
132:                return converter;
133:            }
134:
135:            private static Iterable<String[]> createIterable(String uri,
136:                    FlatFileColumnDescriptor[] descriptors, String encoding) {
137:                PadFormat[] formats = ArrayPropertyExtractor.convert(
138:                        descriptors, "format", PadFormat.class);
139:                return new FlatFileLineIterable(uri, formats, true, encoding);
140:            }
141:
142:        }
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