org.openedit.data.lucene.SearchResultStoredFieldVisitor.java Source code

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Here is the source code for org.openedit.data.lucene.SearchResultStoredFieldVisitor.java

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package org.openedit.data.lucene;

/*
 * 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.
 */

import java.io.IOException;
import java.util.Map;
import java.util.Set;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.FieldType;
import org.apache.lucene.document.StoredField;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.FieldInfo;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.StoredFieldVisitor;
import org.openedit.Data;

/**
 * A {@link StoredFieldVisitor} that creates a {@link Document} containing all
 * stored fields, or only specific requested fields provided to
 * {@link #DocumentStoredFieldVisitor(Set)}.
 * <p>
 * This is used by {@link IndexReader#document(int)} to load a document.
 * 
 */
public class SearchResultStoredFieldVisitor extends StoredFieldVisitor {
    /** Load all stored fields. */
    public SearchResultStoredFieldVisitor(Map inKeys) {
        fieldKeys = inKeys;
        int size = inKeys.size();
        if (size == 0) {
            size = 3;//at least id name sourcepath
        }
        fieldValues = new String[size];
    }

    protected Map<String, Integer> fieldKeys;

    public Map<String, Integer> getKeys() {
        return fieldKeys;
    }

    public void setKeys(Map<String, Integer> inKeys) {
        fieldKeys = inKeys;
    }

    public String[] getValues() {
        return fieldValues;
    }

    public void setValues(String[] inValues) {
        fieldValues = inValues;
    }

    protected String[] fieldValues;

    protected void putValue(String inKey, String inValue) {
        Integer index = fieldKeys.get(inKey);
        if (index == null) {
            index = fieldKeys.size();
            fieldKeys.put(inKey, index);
        }
        growTo(index);
        fieldValues[index] = inValue;
    }

    protected void growTo(Integer inIndex) {
        if (fieldValues.length <= inIndex) {
            String[] newsize = new String[inIndex + 1]; //grow only a little, this should not happen often
            System.arraycopy(fieldValues, 0, newsize, 0, fieldValues.length);
            fieldValues = newsize;
        }

    }

    @Override
    public void binaryField(FieldInfo fieldInfo, byte[] value) throws IOException {
        if (value.length > 0) {
            StoredField stored = new StoredField(fieldInfo.name, value);
            putValue(fieldInfo.name, stored.stringValue());
        }
    }

    @Override
    public void stringField(FieldInfo fieldInfo, String value) throws IOException {
        final FieldType ft = new FieldType(TextField.TYPE_STORED);
        ft.setStoreTermVectors(fieldInfo.hasVectors());
        ft.setIndexed(fieldInfo.isIndexed());
        ft.setOmitNorms(fieldInfo.omitsNorms());
        ft.setIndexOptions(fieldInfo.getIndexOptions());
        String val = new Field(fieldInfo.name, value, ft).stringValue();
        putValue(fieldInfo.name, val);
    }

    @Override
    public void intField(FieldInfo fieldInfo, int value) {
        StoredField stored = new StoredField(fieldInfo.name, value);
        putValue(fieldInfo.name, stored.stringValue());
    }

    @Override
    public void longField(FieldInfo fieldInfo, long value) {
        StoredField stored = new StoredField(fieldInfo.name, value);
        putValue(fieldInfo.name, stored.stringValue());
    }

    @Override
    public void floatField(FieldInfo fieldInfo, float value) {
        StoredField stored = new StoredField(fieldInfo.name, value);
        putValue(fieldInfo.name, stored.stringValue());
    }

    @Override
    public void doubleField(FieldInfo fieldInfo, double value) {
        StoredField stored = new StoredField(fieldInfo.name, value);
        putValue(fieldInfo.name, stored.stringValue());
    }

    @Override
    public Status needsField(FieldInfo fieldInfo) throws IOException {
        return Status.YES;
    }

    public Data createSearchResult() {
        SearchResultData data = new SearchResultData(fieldKeys, fieldValues);
        return data;
    }
}