Introduced AbstractKeywordFilter as a com.sap.sse.common.filter.Filter

implementation that implements keyword filtering logic

java/com.sap.sse.common/src/com/sap/sse/common/filter/AbstractKeywordFilter.java

@@ -0,0 +1,47 @@
+package com.sap.sse.common.filter;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import com.sap.sse.common.Util;
+import com.sap.sse.common.filter.impl.KeywordMatcher;
+
+/**
+ * {@link Filter} implementation that matches the given objects using a {@link KeywordMatcher}.
+ *
+ * @param <T>
+ */
+public abstract class AbstractKeywordFilter<T> implements Filter<T> {
+
+    private final KeywordMatcher<T> matcher = new KeywordMatcher<T>() {
+        @Override
+        public Iterable<String> getStrings(T t) {
+            return AbstractKeywordFilter.this.getStrings(t);
+        }
+    };
+
+    private final Set<String> keywords = new HashSet<>();
+
+    /**
+     * Sets the keywords to use for matching of domain objects.
+     */
+    public void setKeywords(Iterable<String> keywords) {
+        this.keywords.clear();
+        Util.addAll(keywords, this.keywords);
+    }
+
+    /**
+     * @see KeywordMatcher#getStrings(Object)
+     */
+    public abstract Iterable<String> getStrings(T t);
+
+    @Override
+    public boolean matches(T t) {
+        return matcher.matches(keywords, t);
+    }
+
+    @Override
+    public String getName() {
+        return getClass().getSimpleName();
+    }
+}