001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2008-2011 SonarSource
004     * mailto:contact AT sonarsource DOT com
005     *
006     * Sonar is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * Sonar is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public
017     * License along with Sonar; if not, write to the Free Software
018     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019     */
020    package org.sonar.duplications.statement;
021    
022    import java.util.List;
023    
024    import org.sonar.duplications.token.Token;
025    
026    public class Statement {
027    
028      private final int startLine;
029      private final int endLine;
030      private final String value;
031    
032      /**
033       * Cache for hash code.
034       */
035      private int hash;
036    
037      public Statement(int startLine, int endLine, String value) {
038        this.startLine = startLine;
039        this.endLine = endLine;
040        this.value = value;
041      }
042    
043      public Statement(List<Token> tokens) {
044        if (tokens == null || tokens.isEmpty()) {
045          throw new IllegalArgumentException("A statement can't be initialized with an empty list of tokens");
046        }
047        StringBuilder sb = new StringBuilder();
048        for (Token token : tokens) {
049          sb.append(token.getValue());
050        }
051        this.value = sb.toString();
052        this.startLine = tokens.get(0).getLine();
053        this.endLine = tokens.get(tokens.size() - 1).getLine();
054      }
055    
056      public int getStartLine() {
057        return startLine;
058      }
059    
060      public int getEndLine() {
061        return endLine;
062      }
063    
064      public String getValue() {
065        return value;
066      }
067    
068      @Override
069      public int hashCode() {
070        int h = hash;
071        if (h == 0) {
072          h = value.hashCode();
073          h = 31 * h + startLine;
074          h = 31 * h + endLine;
075          hash = h;
076        }
077        return h;
078      }
079    
080      @Override
081      public boolean equals(Object obj) {
082        if (!(obj instanceof Statement)) {
083          return false;
084        }
085        Statement other = (Statement) obj;
086        return startLine == other.startLine
087            && endLine == other.endLine
088            && value.equals(other.value);
089      }
090    
091      @Override
092      public String toString() {
093        return "[" + getStartLine() + "-" + getEndLine() + "] [" + getValue() + "]";
094      }
095    
096    }