72 lines
2.0 KiB
Java
72 lines
2.0 KiB
Java
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/*************************************************************************
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* Compilation: javac FileIndex.java
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* Execution: java FileIndex file1.txt file2.txt file3.txt ...
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* Dependencies: ST.java SET.java In.java StdIn.java StdOut.java
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* Data files: http://algs4.cs.princeton.edu/35applications/ex1.txt
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* http://algs4.cs.princeton.edu/35applications/ex2.txt
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* http://algs4.cs.princeton.edu/35applications/ex3.txt
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* http://algs4.cs.princeton.edu/35applications/ex4.txt
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*
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* % java FileIndex ex*.txt
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* age
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* ex3.txt
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* ex4.txt
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* best
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* ex1.txt
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* was
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* ex1.txt
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* ex2.txt
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* ex3.txt
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* ex4.txt
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*
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* % java FileIndex *.txt
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*
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* % java FileIndex *.java
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*
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*************************************************************************/
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import java.io.File;
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import edu.princeton.cs.introcs.In;
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import edu.princeton.cs.introcs.StdIn;
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import edu.princeton.cs.introcs.StdOut;
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public class FileIndex {
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public static void main(String[] args) {
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// key = word, value = set of files containing that word
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ST<String, SET<File>> st = new ST<String, SET<File>>();
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// create inverted index of all files
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StdOut.println("Indexing files");
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for (String filename : args) {
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StdOut.println(" " + filename);
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File file = new File(filename);
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In in = new In(file);
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while (!in.isEmpty()) {
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String word = in.readString();
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if (!st.contains(word)) st.put(word, new SET<File>());
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SET<File> set = st.get(word);
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set.add(file);
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}
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}
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// read queries from standard input, one per line
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while (!StdIn.isEmpty()) {
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String query = StdIn.readString();
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if (st.contains(query)) {
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SET<File> set = st.get(query);
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for (File file : set) {
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StdOut.println(" " + file.getName());
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}
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}
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}
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}
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}
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