| /* |
| * 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.uima.search; |
| |
| import java.io.Serializable; |
| |
| import org.apache.uima.util.XMLizable; |
| |
| /** |
| * Specifies a constraint that matches against annotations in the CAS. Filters are assigned to |
| * {@link IndexBuildItem}s in order to specify which annotation instnaces are subject to indexing |
| * according to the rule specified by the IndexBuildItem. |
| * <p> |
| * We support an open-ended schema for filters. Each Filter has a {@link #getSyntax() syntax} |
| * declaration and an {@link #getExpression() expression}. Each are arbitrary strings. The syntax |
| * declaration is intended to tell the indexer how to interpret the expression. Any given indexer |
| * implementation will declare which syntaxes it supports. |
| * <p> |
| * The only syntax the indexers are required to import is the <code>FeatureValue</code> syntax, |
| * which permits very simple expressions that test the values of features. Expressions using this |
| * syntax take the form <code><FeatureName> <Operator> <Literal></code>, where |
| * FeatureName is a CAS feature name, Operator is either =, !=, <, <=, >, or >=, and |
| * Literal is an integer, floating point number (no exponent syntax supported) or string literal |
| * enclosed in double quotes, with embedded quotes and backslashes escaped by a backslash. For |
| * example, the following are valid filters: |
| * <ul> |
| * <li>foo = "hello world"</li> |
| * <li>foo < 42 </li> |
| * <li>bar7 = "\"Blah,\" he said." |
| * <li>bar7 >= 0.5</li> |
| * </ul> |
| * This object implements the {@link XMLizable} interface and can be parsed from an XML |
| * representation. |
| * |
| * |
| */ |
| public interface Filter extends XMLizable, Serializable { |
| |
| /** |
| * Gets the declared syntax for this filter's expression. |
| * |
| * @return an identifier indicating the syntax used by this filter |
| */ |
| public String getSyntax(); |
| |
| /** |
| * Sets the declared syntax for this this filter's expression. |
| * |
| * @param aSyntax |
| * an identifier indicating the syntax used by this filter |
| */ |
| public void setSyntax(String aSyntax); |
| |
| /** |
| * Gets the filter expression. This is a string intended to be interpreted according to the |
| * {@link #getSyntax() syntax}. |
| * |
| * @return the filter expression |
| */ |
| public String getExpression(); |
| |
| /** |
| * Sets the filter expression. This is a string intended to be interpreted according to the |
| * {@link #getSyntax() syntax}. |
| * |
| * @param aExpression |
| * the filter expression |
| */ |
| public void setExpression(String aExpression); |
| |
| } |