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      1 /*
      2  * Copyright (C) 2007 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package org.apache.harmony.xml.parsers;
     18 
     19 import java.util.Collections;
     20 import java.util.HashMap;
     21 import java.util.Map;
     22 import javax.xml.parsers.SAXParser;
     23 import org.apache.harmony.xml.ExpatReader;
     24 import org.xml.sax.Parser;
     25 import org.xml.sax.SAXException;
     26 import org.xml.sax.SAXNotRecognizedException;
     27 import org.xml.sax.SAXNotSupportedException;
     28 import org.xml.sax.XMLReader;
     29 import org.xml.sax.helpers.XMLReaderAdapter;
     30 
     31 /**
     32  * A SAX parser based on Expat.
     33  */
     34 final class SAXParserImpl extends SAXParser {
     35 
     36     private Map<String, Boolean> initialFeatures;
     37     private XMLReader reader;
     38     private Parser parser;
     39 
     40     SAXParserImpl(Map<String, Boolean> initialFeatures)
     41             throws SAXNotRecognizedException, SAXNotSupportedException {
     42         this.initialFeatures = initialFeatures.isEmpty()
     43                 ? Collections.<String, Boolean>emptyMap()
     44                 : new HashMap<String, Boolean>(initialFeatures);
     45         resetInternal();
     46     }
     47 
     48     private void resetInternal()
     49             throws SAXNotSupportedException, SAXNotRecognizedException {
     50         reader = new ExpatReader();
     51         for (Map.Entry<String,Boolean> entry : initialFeatures.entrySet()) {
     52             reader.setFeature(entry.getKey(), entry.getValue());
     53         }
     54     }
     55 
     56     @Override public void reset() {
     57         /*
     58          * The exceptions are impossible. If any features are unrecognized or
     59          * unsupported, construction of this instance would have failed.
     60          */
     61         try {
     62             resetInternal();
     63         } catch (SAXNotRecognizedException e) {
     64             throw new AssertionError();
     65         } catch (SAXNotSupportedException e) {
     66             throw new AssertionError();
     67         }
     68     }
     69 
     70     @Override
     71     public Parser getParser() {
     72         if (parser == null) {
     73             parser = new XMLReaderAdapter(reader);
     74         }
     75 
     76         return parser;
     77     }
     78 
     79     @Override
     80     public Object getProperty(String name) throws SAXNotRecognizedException,
     81             SAXNotSupportedException {
     82         return reader.getProperty(name);
     83     }
     84 
     85     @Override
     86     public XMLReader getXMLReader() {
     87         return reader;
     88     }
     89 
     90     @Override
     91     public boolean isNamespaceAware() {
     92         try {
     93             return reader.getFeature("http://xml.org/sax/features/namespaces");
     94         } catch (SAXException ex) {
     95             return false;
     96         }
     97     }
     98 
     99     @Override
    100     public boolean isValidating() {
    101         return false;
    102     }
    103 
    104     @Override
    105     public void setProperty(String name, Object value)
    106             throws SAXNotRecognizedException, SAXNotSupportedException {
    107         reader.setProperty(name, value);
    108     }
    109 }
    110