1 files changed, 189 insertions, 0 deletions
diff --git a/sca-java-1.x/branches/sca-java-1.6.2/modules/domain-search/src/main/java/org/apache/tuscany/sca/domain/search/impl/HighlightingUtil.java b/sca-java-1.x/branches/sca-java-1.6.2/modules/domain-search/src/main/java/org/apache/tuscany/sca/domain/search/impl/HighlightingUtil.java
new file mode 100644
index 0000000000..ba8e1bf021
--- /dev/null
+++ b/sca-java-1.x/branches/sca-java-1.6.2/modules/domain-search/src/main/java/org/apache/tuscany/sca/domain/search/impl/HighlightingUtil.java
@@ -0,0 +1,189 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.domain.search.impl;
+
+import java.io.IOException;
+import java.io.StringReader;
+import java.util.Map;
+
+import org.apache.lucene.analysis.CachingTokenFilter;
+import org.apache.lucene.search.Query;
+import org.apache.lucene.search.highlight.Fragmenter;
+import org.apache.lucene.search.highlight.Highlighter;
+import org.apache.lucene.search.highlight.InvalidTokenOffsetsException;
+import org.apache.lucene.search.highlight.NullFragmenter;
+import org.apache.lucene.search.highlight.SimpleFragmenter;
+import org.apache.lucene.search.highlight.QueryScorer;
+import org.apache.tuscany.sca.domain.search.Result;
+
+/**
+ * @version $Rev$ $Date$
+ */
+final public class HighlightingUtil {
+
+    public static void highlightResult(Result result, Query query) {
+        highlightResult(result, query, new SimpleFragmenter(70));
+    }
+
+    public static void highlightResult(Result result, Query query, Fragmenter fragmenter) {
+        Map<String, Result> contents = result.getContents();
+
+        if (contents != null) {
+
+            for (Result content : contents.values()) {
+                highlightResult(content, query, fragmenter);
+            }
+
+        }
+
+        String highlightedText =
+            HighlightingUtil.bestFragmentHighlighted(result.getField(), query, result.getValue(), fragmenter);
+
+        // checks if something was highlighted before resetting the value
+        if (highlightedText != null && highlightedText.length() > 0) {
+            result.setValue(highlightedText);
+        }
+
+    }
+
+    public static String highlight(String field, Query query, String text) {
+        String highlightedText = bestFragmentHighlighted(field, query, text, new NullFragmenter());
+
+        if (highlightedText == null || text.length() >= highlightedText.length()) {
+            return text;
+        }
+
+        return highlightedText;
+
+    }
+
+    public static String bestFragmentHighlighted(String field, Query query, String text) throws IOException {
+        return bestFragmentHighlighted(field, query, text, new SimpleFragmenter(100));
+    }
+
+    public static String bestFragmentHighlighted(String field, Query query, String text, Fragmenter fragmenter) {
+
+        try {
+            CachingTokenFilter tokenStream =
+                new CachingTokenFilter(new DomainSearchAnalyzer().tokenStream(field, new StringReader(text)));
+
+			QueryScorer scorer = new QueryScorer(query, field, "");
+			scorer.init(tokenStream);
+			
+            Highlighter highlighter =
+                new Highlighter(new DomainSearchFormatter(), scorer);
+            highlighter.setTextFragmenter(fragmenter);
+            tokenStream.reset();
+
+            try {
+                return highlighter.getBestFragments(tokenStream, text, 2, " ... ");
+
+            } catch (InvalidTokenOffsetsException e) {
+                // could not create fragments, return empty string
+            }
+
+        } catch (IOException ex) {
+            // should never happen
+        }
+
+        return "";
+
+    }
+
+    public static String replaceHighlightMarkupBy(CharSequence text, String startHighlight, String endHighlight) {
+        StringBuilder sb = new StringBuilder();
+        int start = 0;
+        int end = 0;
+
+        for (int i = 0; i < text.length(); i++) {
+            char c = text.charAt(i);
+
+            if (start > 0) {
+
+                if (c == DomainSearchFormatter.HIGHLIGHT_START.charAt(start)) {
+                    start++;
+
+                    if (start == DomainSearchFormatter.HIGHLIGHT_START.length()) {
+                        sb.append(startHighlight);
+                        start = 0;
+
+                    }
+
+                } else {
+
+                    for (int j = 0; j < start; j++) {
+                        sb.append(DomainSearchFormatter.HIGHLIGHT_START.charAt(j));
+                    }
+
+                    start = 0;
+
+                }
+
+            } else if (end > 0) {
+
+                if (c == DomainSearchFormatter.HIGHLIGHT_END.charAt(end)) {
+                    end++;
+
+                    if (end == DomainSearchFormatter.HIGHLIGHT_END.length()) {
+                        sb.append(endHighlight);
+                        end = 0;
+
+                    }
+
+                } else {
+
+                    for (int j = 0; j < end; j++) {
+                        sb.append(DomainSearchFormatter.HIGHLIGHT_END.charAt(j));
+                    }
+
+                    end = 0;
+
+                }
+
+            } else if (c == DomainSearchFormatter.HIGHLIGHT_START.charAt(0)) {
+                start = 1;
+
+            } else if (c == DomainSearchFormatter.HIGHLIGHT_END.charAt(0)) {
+                end = 1;
+
+            } else {
+                sb.append(c);
+            }
+
+        }
+
+        if (start > 0) {
+
+            for (int j = 0; j < start; j++) {
+                sb.append(DomainSearchFormatter.HIGHLIGHT_START.charAt(j));
+            }
+
+        } else if (end > 0) {
+
+            for (int j = 0; j < start; j++) {
+                sb.append(DomainSearchFormatter.HIGHLIGHT_END.charAt(j));
+            }
+
+        }
+
+        return sb.toString();
+
+    }
+
+}