Java tutorial
/* * Copyright Robert Newson * * Licensed 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 com.github.rnewson.couchdb.lucene.couchdb; import com.github.rnewson.couchdb.lucene.util.Analyzers; import org.apache.commons.lang.StringUtils; import org.apache.lucene.analysis.Analyzer; import org.json.JSONException; import org.json.JSONObject; import org.mozilla.javascript.Context; import org.mozilla.javascript.Function; import org.mozilla.javascript.ScriptableObject; import java.io.UnsupportedEncodingException; import java.math.BigInteger; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public final class View { private static final String DEFAULT_ANALYZER = "standard"; private static final String ANALYZER = "analyzer"; private static final String INDEX = "index"; private static final String DEFAULTS = "defaults"; private final JSONObject json; private final String name; public View(final String name, final JSONObject json) { if (!json.has(INDEX)) { throw new IllegalArgumentException(json + " is not an index"); } this.name = name; this.json = json; } public Analyzer getAnalyzer() throws JSONException { return Analyzers.getAnalyzer(json.optString(ANALYZER, DEFAULT_ANALYZER)); } public ViewSettings getDefaultSettings() throws JSONException { return json.has(DEFAULTS) ? new ViewSettings(json.getJSONObject(DEFAULTS)) : ViewSettings.getDefaultSettings(); } public String getFunction() throws JSONException { return trim(json.getString(INDEX)); } public Function compileFunction(final Context context, ScriptableObject scope) throws JSONException { return context.compileFunction(scope, getFunction(), null, 0, null); } public String getDigest() { try { final MessageDigest md = MessageDigest.getInstance("MD5"); md.update(toBytes(json.optString("analyzer"))); md.update(toBytes(json.optString("defaults"))); md.update(toBytes(json.optString("index"))); return new BigInteger(1, md.digest()).toString(Character.MAX_RADIX); } catch (final NoSuchAlgorithmException e) { throw new Error("MD5 support missing."); } } private static byte[] toBytes(final String str) { if (str == null) { return new byte[0]; } try { return str.getBytes("UTF-8"); } catch (final UnsupportedEncodingException e) { throw new Error("UTF-8 support missing."); } } private String trim(final String fun) { String result = fun; result = StringUtils.trim(result); result = StringUtils.removeStart(result, "\""); result = StringUtils.removeEnd(result, "\""); return result; } @Override public int hashCode() { return getDigest().hashCode(); } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj == null) { return false; } if (!(obj instanceof View)) { return false; } View other = (View) obj; return getDigest().equals(other.getDigest()); } @Override public String toString() { return String.format("View[name=%s, digest=%s]", name, getDigest()); } }