Mercurial > hg > truffle
changeset 19687:787b5aa53401
Truffle: new factory method for files whose contents have already been read.
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
---|---|
date | Tue, 03 Mar 2015 16:54:43 -0800 |
parents | 10a1fc5e3209 |
children | 33bdafbf285d |
files | graal/com.oracle.truffle.api/src/com/oracle/truffle/api/source/Source.java |
diffstat | 1 files changed, 41 insertions(+), 2 deletions(-) [+] |
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--- a/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/source/Source.java Sat Feb 28 15:52:13 2015 -0800 +++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/source/Source.java Tue Mar 03 16:54:43 2015 -0800 @@ -1,5 +1,5 @@ /* - * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it @@ -122,6 +122,35 @@ } /** + * Gets the canonical representation of a source file, whose contents have already been read and + * need not be read again. It is confirmed that the file resolves to a file name, so it can be + * indexed by canonical path, but it is not confirmed to be readable. + * + * @param chars textual source code already read from the file + * @param fileName + * @return canonical representation of the file's contents. + * @throws IOException if the file cannot be found + * @throws IllegalArgumentException if there is already a Source indexed under this file name + */ + public static Source fromFileName(CharSequence chars, String fileName) throws IOException, IllegalArgumentException { + final WeakReference<Source> nameRef = filePathToSource.get(fileName); + Source source = nameRef == null ? null : nameRef.get(); + if (source == null) { + final File file = new File(fileName); + // We are going to trust that the fileName is readable. + final String path = file.getCanonicalPath(); + final WeakReference<Source> pathRef = filePathToSource.get(path); + source = pathRef == null ? null : pathRef.get(); + if (source == null) { + source = new FileSource(file, fileName, path, chars); + filePathToSource.put(path, new WeakReference<>(source)); + return source; + } + } + throw new IOException("Source already exists for file:" + fileName); + } + + /** * Creates a non-canonical source from literal text. If an already created literal source must * be retrievable by name, use {@link #asPseudoFile(CharSequence, String)}. * @@ -275,10 +304,13 @@ } /** - * Return the complete text of the code. + * Returns the complete text of the code. */ public abstract String getCode(); + /** + * Returns a subsection of the code test. + */ public String getCode(int charIndex, int charLength) { return getCode().substring(charIndex, charIndex + charLength); } @@ -542,9 +574,16 @@ private long timeStamp; // timestamp of the cache in the file system public FileSource(File file, String name, String path) { + this(file, name, path, null); + } + + public FileSource(File file, String name, String path, CharSequence chars) { this.file = file.getAbsoluteFile(); this.name = name; this.path = path; + if (chars != null) { + this.code = chars.toString(); + } } @Override