001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.hadoop.tools.twitter;
031
032import java.util.ArrayList;
033import java.util.Collection;
034
035import org.hamcrest.Matcher;
036import static org.hamcrest.Matchers.*;
037
038import org.openimaj.util.pair.IndependentPair;
039
040import com.jayway.jsonassert.JsonAsserter;
041import static com.jayway.jsonassert.JsonAssert.*;
042
043/**
044 * Given a collection of JSONpath, treat each path as a filter and return true if
045 * a given json input matches every filter
046 * 
047 * @author Sina Samangooei (ss@ecs.soton.ac.uk)
048 *
049 */
050public class JsonPathFilterSet {
051        private ArrayList<IndependentPair<String,Matcher<?>>> filters;
052        
053        
054        /**
055         * @param paths the json paths against which to filter
056         */
057        public JsonPathFilterSet(Collection<String> paths) {
058                this();
059                if(paths == null) return;
060                for (String string : paths) {
061                        addString(string);
062                }
063        }
064        
065        private void addString(String string) {
066                System.out.println("Adding String: " + string);
067                String[] split = string.split(":==");
068                IndependentPair<String, Matcher<?>> r = null;
069                if(split.length == 1)
070                {
071                        r = new IndependentPair<String,Matcher<?>>(split[0], null);
072                }
073                else{
074                        r = new IndependentPair<String,Matcher<?>>(split[0],equalTo(split[1]));
075                }
076                this.filters.add(r);
077        }
078
079        /**
080         * @param paths the json paths against which to filter
081         */
082        public JsonPathFilterSet(String ... paths) {
083                this();
084                for (String string : paths) {
085                        addString(string);
086                }
087        }
088
089        private JsonPathFilterSet() {
090                this.filters = new ArrayList<IndependentPair<String,Matcher<?>>>();
091        }
092        
093        /**
094         * @param json the input to be checked
095         * @return true if the inputed json matches all filters
096         */
097        public boolean filter(String json){
098                JsonAsserter jass = with(json);
099                for (IndependentPair<String, Matcher<?>> filter : this.filters) {
100                        String path = filter.firstObject();
101                        Matcher<?> matcher = filter.secondObject();
102                        try{
103                                if(matcher==null)
104                                        jass = jass.assertNotNull(path);
105                                else
106                                        jass = jass.assertThat(path, matcher);
107                        }catch(AssertionError e){
108                                return false;
109                        }
110                }
111                return true;
112        }
113}