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最新评论
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hanjiyun:
本人水平还有待提高,进步空间很大,看这些文章给我有很大的指导作 ...
JVM的内存管理 Ⅲ -
liuxinglanyue:
四年后的自己:这种方法 不靠谱。 使用javaagent的方式 ...
计算Java对象占用内存空间的大小(对于32位虚拟机而言) -
jaysoncn:
附件在哪里啊test.NoCertificationHttps ...
使用HttpClient过程中常见的一些问题 -
231fuchenxi:
你好,有redis,memlink,mysql的测试代码吗?可 ...
MemLink 性能测试 -
guyue1015:
[color=orange][/color][size=lar ...
JAVA同步机制
package org.apache.lucene.document; /** * 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.util.*; // for javadoc import org.apache.lucene.search.ScoreDoc; // for javadoc import org.apache.lucene.search.Searcher; // for javadoc import org.apache.lucene.index.IndexReader; // for javadoc /** Documents are the unit of indexing and search. * * A Document is a set of fields. Each field has a name and a textual value. * A field may be {@link Fieldable#isStored() stored} with the document, in which * case it is returned with search hits on the document. Thus each document * should typically contain one or more stored fields which uniquely identify * it. * * <p>Note that fields which are <i>not</i> {@link Fieldable#isStored() stored} are * <i>not</i> available in documents retrieved from the index, e.g. with {@link * ScoreDoc#doc}, {@link Searcher#doc(int)} or {@link * IndexReader#document(int)}. */ public final class Document implements java.io.Serializable { List<Fieldable> fields = new ArrayList<Fieldable>(); private float boost = 1.0f; /** Constructs a new document with no fields. */ public Document() {} /** Sets a boost factor for hits on any field of this document. This value * will be multiplied into the score of all hits on this document. * * <p>The default value is 1.0. * * <p>Values are multiplied into the value of {@link Fieldable#getBoost()} of * each field in this document. Thus, this method in effect sets a default * boost for the fields of this document. * * @see Fieldable#setBoost(float) */ public void setBoost(float boost) { this.boost = boost; } /** Returns, at indexing time, the boost factor as set by {@link #setBoost(float)}. * * <p>Note that once a document is indexed this value is no longer available * from the index. At search time, for retrieved documents, this method always * returns 1. This however does not mean that the boost value set at indexing * time was ignored - it was just combined with other indexing time factors and * stored elsewhere, for better indexing and search performance. (For more * information see the "norm(t,d)" part of the scoring formula in * {@link org.apache.lucene.search.Similarity Similarity}.) * * @see #setBoost(float) */ public float getBoost() { return boost; } /** * <p>Adds a field to a document. Several fields may be added with * the same name. In this case, if the fields are indexed, their text is * treated as though appended for the purposes of search.</p> * <p> Note that add like the removeField(s) methods only makes sense * prior to adding a document to an index. These methods cannot * be used to change the content of an existing index! In order to achieve this, * a document has to be deleted from an index and a new changed version of that * document has to be added.</p> */ public final void add(Fieldable field) { fields.add(field); } /** * <p>Removes field with the specified name from the document. * If multiple fields exist with this name, this method removes the first field that has been added. * If there is no field with the specified name, the document remains unchanged.</p> * <p> Note that the removeField(s) methods like the add method only make sense * prior to adding a document to an index. These methods cannot * be used to change the content of an existing index! In order to achieve this, * a document has to be deleted from an index and a new changed version of that * document has to be added.</p> */ public final void removeField(String name) { Iterator<Fieldable> it = fields.iterator(); while (it.hasNext()) { Fieldable field = it.next(); if (field.name().equals(name)) { it.remove(); return; } } } /** * <p>Removes all fields with the given name from the document. * If there is no field with the specified name, the document remains unchanged.</p> * <p> Note that the removeField(s) methods like the add method only make sense * prior to adding a document to an index. These methods cannot * be used to change the content of an existing index! In order to achieve this, * a document has to be deleted from an index and a new changed version of that * document has to be added.</p> */ public final void removeFields(String name) { Iterator<Fieldable> it = fields.iterator(); while (it.hasNext()) { Fieldable field = it.next(); if (field.name().equals(name)) { it.remove(); } } } /** Returns a field with the given name if any exist in this document, or * null. If multiple fields exists with this name, this method returns the * first value added. * Do not use this method with lazy loaded fields. */ public final Field getField(String name) { return (Field) getFieldable(name); } /** Returns a field with the given name if any exist in this document, or * null. If multiple fields exists with this name, this method returns the * first value added. */ public Fieldable getFieldable(String name) { for (Fieldable field : fields) { if (field.name().equals(name)) return field; } return null; } /** Returns the string value of the field with the given name if any exist in * this document, or null. If multiple fields exist with this name, this * method returns the first value added. If only binary fields with this name * exist, returns null. */ public final String get(String name) { for (Fieldable field : fields) { if (field.name().equals(name) && (!field.isBinary())) return field.stringValue(); } return null; } /** Returns a List of all the fields in a document. * <p>Note that fields which are <i>not</i> {@link Fieldable#isStored() stored} are * <i>not</i> available in documents retrieved from the * index, e.g. {@link Searcher#doc(int)} or {@link * IndexReader#document(int)}. */ public final List<Fieldable> getFields() { return fields; } private final static Field[] NO_FIELDS = new Field[0]; /** * Returns an array of {@link Field}s with the given name. * Do not use with lazy loaded fields. * This method returns an empty array when there are no * matching fields. It never returns null. * * @param name the name of the field * @return a <code>Field[]</code> array */ public final Field[] getFields(String name) { List<Field> result = new ArrayList<Field>(); for (Fieldable field : fields) { if (field.name().equals(name)) { result.add((Field) field); } } if (result.size() == 0) return NO_FIELDS; return result.toArray(new Field[result.size()]); } private final static Fieldable[] NO_FIELDABLES = new Fieldable[0]; /** * Returns an array of {@link Fieldable}s with the given name. * This method returns an empty array when there are no * matching fields. It never returns null. * * @param name the name of the field * @return a <code>Fieldable[]</code> array */ public Fieldable[] getFieldables(String name) { List<Fieldable> result = new ArrayList<Fieldable>(); for (Fieldable field : fields) { if (field.name().equals(name)) { result.add(field); } } if (result.size() == 0) return NO_FIELDABLES; return result.toArray(new Fieldable[result.size()]); } private final static String[] NO_STRINGS = new String[0]; /** * Returns an array of values of the field specified as the method parameter. * This method returns an empty array when there are no * matching fields. It never returns null. * @param name the name of the field * @return a <code>String[]</code> of field values */ public final String[] getValues(String name) { List<String> result = new ArrayList<String>(); for (Fieldable field : fields) { if (field.name().equals(name) && (!field.isBinary())) result.add(field.stringValue()); } if (result.size() == 0) return NO_STRINGS; return result.toArray(new String[result.size()]); } private final static byte[][] NO_BYTES = new byte[0][]; /** * Returns an array of byte arrays for of the fields that have the name specified * as the method parameter. This method returns an empty * array when there are no matching fields. It never * returns null. * * @param name the name of the field * @return a <code>byte[][]</code> of binary field values */ public final byte[][] getBinaryValues(String name) { List<byte[]> result = new ArrayList<byte[]>(); for (Fieldable field : fields) { if (field.name().equals(name) && (field.isBinary())) result.add(field.getBinaryValue()); } if (result.size() == 0) return NO_BYTES; return result.toArray(new byte[result.size()][]); } /** * Returns an array of bytes for the first (or only) field that has the name * specified as the method parameter. This method will return <code>null</code> * if no binary fields with the specified name are available. * There may be non-binary fields with the same name. * * @param name the name of the field. * @return a <code>byte[]</code> containing the binary field value or <code>null</code> */ public final byte[] getBinaryValue(String name) { for (Fieldable field : fields) { if (field.name().equals(name) && (field.isBinary())) return field.getBinaryValue(); } return null; } /** Prints the fields of a document for human consumption. */ @Override public final String toString() { StringBuilder buffer = new StringBuilder(); buffer.append("Document<"); for (int i = 0; i < fields.size(); i++) { Fieldable field = fields.get(i); buffer.append(field.toString()); if (i != fields.size()-1) buffer.append(" "); } buffer.append(">"); return buffer.toString(); } }
发表评论
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