Validation
001 package org.gxml.book.validation;
002
003 import java.io.InputStream;
004 import java.net.URI;
005 import java.util.LinkedList;
006 import java.util.List;
007
008 import org.gxml.book.common.SampleApp;
009 import org.gxml.sa.GxFragmentBuilder;
010 import org.gxml.sa.GxModel;
011 import org.gxml.sa.GxProcessingContext;
012 import org.gxml.xdm.Resolved;
013 import org.gxml.xdm.Resolver;
014 import org.gxml.xs.SmException;
015 import org.gxml.xs.SmExceptionCatcher;
016 import org.gxml.xs.SmExceptionHandler;
017 import org.gxml.xs.SmMetaLoadArgs;
018
019 import com.tibco.gxml.sa.common.helpers.DocumentBuilderFactory;
020 import com.tibco.gxml.sa.common.helpers.GxDocumentBuilder;
021 import com.tibco.gxml.sa.common.helpers.GxDocumentBuilderFactory;
022 import com.tibco.gxml.sa.common.helpers.SmAtomBridgeOnGxAtomBridgeAdapter;
023 import com.tibco.gxml.sa.processor.validation.GxContentValidator;
024 import com.tibco.gxml.sa.processor.validation.GxValidatorCache;
025 import com.tibco.gxml.sa.processor.validation.GxValidatorCacheFactory;
026 import com.tibco.gxml.sa.processor.validation.ValidatorCacheFactory;
027 import com.tibco.gxml.xs.W3cXmlSchemaParser;
028
029 public abstract class ValidationSample<I, U, N extends I, A extends I, S, T, X> extends SampleApp<I, U, N, A, S, T, X>
030 {
031 public void testByteStreamValidation() throws Exception
032 {
033 // Load a top-level schema into the processing context.
034 final List<Resolved<InputStream>> resources = new LinkedList<Resolved<InputStream>>();
035 resources.add(getResolver().resolveInputStream(new URI("PurchaseOrder.xsd")));
036
037 final SmExceptionCatcher errors = new SmExceptionCatcher();
038 final SmMetaLoadArgs args = new SmMetaLoadArgs();
039
040 final GxProcessingContext<I, U, N, A, S, T, X> pcx = newProcessingContext();
041
042 final W3cXmlSchemaParser<A, S> parser = new W3cXmlSchemaParser<A, S>(new SmAtomBridgeOnGxAtomBridgeAdapter<A, S>(pcx.getAtomBridge()));
043
044 for (final Resolved<InputStream> resource : resources)
045 {
046 pcx.register(parser.parse(resource.getLocation(), resource.getResource(), resource.getSystemId(), errors, args, pcx));
047 }
048
049 pcx.lock();
050
051 // Create a validator...
052 final GxValidatorCacheFactory<A, S, T> vcf = new ValidatorCacheFactory<I, U, N, A, S, T, X>(pcx);
053 final GxValidatorCache<A, S, T> vc = vcf.newValidatorCache();
054 final GxContentValidator<A, S, T> validator = vc.newContentValidator();
055
056 // Set the downstream event handler which contains annotations and typed content.
057 // validator.setGxContentHandler(/* ...*/null);
058 validator.setExceptionHandler(errors);
059
060 // The document node that we wish to validate.
061 final Resolved<InputStream> xmlInput = getResolver().resolveInputStream(new URI("PurchaseOrder.xml"));
062
063 final GxDocumentBuilderFactory<N, S> factory = new DocumentBuilderFactory<I, U, N, A, S, T, X>(pcx);
064
065 final GxDocumentBuilder<N> builder = factory.newDocumentBuilder();
066
067 final N document = builder.parse(xmlInput.getResource(), xmlInput.getSystemId());
068
069 // Stream the document into the validator.
070 final GxModel<N, A, S, T> model = pcx.getModel();
071
072 model.stream(document, true, true, validator);
073
074 if (errors.size() > 0)
075 {
076 // You've got errors.'
077 }
078 }
079
080 public void testTreeValidation() throws Exception
081 {
082 final Resolver resolver = getResolver();
083
084 // Load a top-level schema into the processing context.
085 final List<Resolved<InputStream>> resources = new LinkedList<Resolved<InputStream>>();
086 resources.add(getResolver().resolveInputStream(new URI("PurchaseOrder.xsd")));
087
088 final SmExceptionCatcher errors = new SmExceptionCatcher();
089 final SmMetaLoadArgs args = new SmMetaLoadArgs();
090
091 final GxProcessingContext<I, U, N, A, S, T, X> pcx = newProcessingContext();
092 final W3cXmlSchemaParser<A, S> parser = new W3cXmlSchemaParser<A, S>(new SmAtomBridgeOnGxAtomBridgeAdapter<A, S>(pcx.getAtomBridge()));
093 for (final Resolved<InputStream> resource : resources)
094 {
095 pcx.register(parser.parse(resource.getLocation(), resource.getResource(), resource.getSystemId(), errors, args, pcx));
096 }
097 pcx.lock();
098 // The document node that we wish to validate.
099 @SuppressWarnings("unused")
100 final URI xmlLocation = new URI("PurchaseOrder.xml");
101 final URI xmlSystemId = new URI("PurchaseOrder.xml");
102 final Resolved<InputStream> xmlInput = resolver.resolveInputStream(xmlSystemId);
103
104 final GxDocumentBuilderFactory<N, S> factory = new DocumentBuilderFactory<I, U, N, A, S, T, X>(pcx);
105
106 final GxDocumentBuilder<N> builder = factory.newDocumentBuilder();
107
108 final N documentIn = builder.parse(xmlInput.getResource(), xmlInput.getSystemId());
109
110 @SuppressWarnings("unused")
111 final N documentOut = validate(documentIn, errors, pcx);
112
113 if (errors.size() > 0)
114 {
115 // You've got errors.'
116 for (@SuppressWarnings("unused")
117 final SmException error : errors)
118 {
119 // System.out.println(error.getLocalizedMessage());
120 }
121 }
122 }
123
124 /**
125 * This static function illustrates a helper function for validating a document tree. <br/>
126 * Note that we assume that the processing context is already loaded with meta-data.
127 *
128 * @param node
129 * The input document.
130 * @param errors
131 * The error handler.
132 * @param pcx
133 * The processing context.
134 */
135 public static <I, U, N extends I, A extends I, S, T, X> N validate(final N node, final SmExceptionHandler errors, final GxProcessingContext<I, U, N, A, S, T, X> pcx)
136 {
137 final GxValidatorCacheFactory<A, S, T> vcf = new ValidatorCacheFactory<I, U, N, A, S, T, X>(pcx);
138
139 // We already have a tree as input so we'll use the content validator'
140 // and stream the document in as a bunch of events (a bit like SAX, but not lexical).
141 final GxValidatorCache<A, S, T> vc = vcf.newValidatorCache();
142
143 final GxContentValidator<A, S, T> validator = vc.newContentValidator();
144
145 validator.setExceptionHandler(errors);
146
147 final GxModel<N, A, S, T> model = pcx.getModel();
148
149 // We want to produce a node so we'll need a fragment builder at the output.'
150 final GxFragmentBuilder<N, A, S, T> builder = pcx.newFragmentBuilder();
151
152 // Connect the pieces together so that the validation output builds a tree.
153 validator.setGxContentHandler(builder);
154
155 // Make it so!
156 model.stream(node, true, true, validator);
157
158 // Practice safe coding: We don't know what might happen if there are errors.'
159 final List<? extends N> nodes = builder.getNodes();
160 if (nodes.size() > 0)
161 {
162 return nodes.get(0);
163 }
164 else
165 {
166 return null;
167 }
168 }
169 }
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