Property constraint dictionary support

Constraint implementation support
Regular expression constraint


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2547 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/dictionary/constraint/RegexConstraint.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2005 Alfresco, Inc.
+ *
+ * Licensed under the Mozilla Public License version 1.1 
+ * with a permitted attribution clause. You may obtain a
+ * copy of the License at
+ *
+ *   http://www.alfresco.org/legal/license.txt
+ *
+ * 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.alfresco.repo.dictionary.constraint;
+
+
+import org.alfresco.service.cmr.dictionary.DictionaryException;
+import org.alfresco.service.cmr.repository.datatype.DefaultTypeConverter;
+
+/**
+ * Constraint implementation that performs regular expression comparisons.
+ * Where possible, the {@link org.alfresco.service.cmr.repository.datatype.DefaultTypeConverter type converter}
+ * will be used to first convert the value to a <code>String</code>, so the evaluation
+ * will be against the value's <code>String</code> equivalent.
+ * 
+ * @see java.lang.String#matches(java.lang.String)
+ * 
+ * @author Derek Hulley
+ */
+public class RegexConstraint extends AbstractConstraint
+{
+    public static final String CONSTRAINT_REGEX_NO_MATCH = "d_dictionary.constraint.regex.no_match";
+
+    private String expression;
+
+    /**
+     * Set the regular expression used to evaluate string values
+     * @param expression similar to the {@link String#matches(java.lang.String) argument
+     */
+    public void setExpression(String expression)
+    {
+        this.expression = expression;
+    }
+
+    public void initialize()
+    {
+        if (expression == null)
+        {
+            throw new DictionaryException(AbstractConstraint.ERR_PROP_NOT_SET, "expression");
+        }
+    }
+
+    public void evaluateSingleValue(Object value)
+    {
+        // convert the value to a String
+        String valueStr = DefaultTypeConverter.INSTANCE.convert(String.class, value);
+        boolean matches = valueStr.matches(expression);
+        if (!matches)
+        {
+            throw new DictionaryException(RegexConstraint.CONSTRAINT_REGEX_NO_MATCH, value, expression);
+        }
+    }
+}