diff options
Diffstat (limited to 'framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/LazyFileOutputStream.java')
-rw-r--r-- | framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/LazyFileOutputStream.java | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/LazyFileOutputStream.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/LazyFileOutputStream.java new file mode 100644 index 00000000..7e5bf786 --- /dev/null +++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/LazyFileOutputStream.java @@ -0,0 +1,162 @@ +/* + * 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. + * + */ +package org.apache.tools.ant.util; + +import java.io.File; +import java.io.FileOutputStream; +import java.io.IOException; +import java.io.OutputStream; + +/** + * Class that delays opening the output file until the first bytes + * shall be written or the method {@link #open open} has been invoked + * explicitly. + * + * @since Ant 1.6 + */ +public class LazyFileOutputStream extends OutputStream { + + private FileOutputStream fos; + private File file; + private boolean append; + private boolean alwaysCreate; + private boolean opened = false; + private boolean closed = false; + + /** + * Creates a stream that will eventually write to the file with + * the given name and replace it. + * @param name the filename. + */ + public LazyFileOutputStream(String name) { + this(name, false); + } + + /** + * Creates a stream that will eventually write to the file with + * the given name and optionally append to instead of replacing + * it. + * @param name the filename. + * @param append if true append rather than replace. + */ + public LazyFileOutputStream(String name, boolean append) { + this(new File(name), append); + } + + /** + * Creates a stream that will eventually write to the file with + * the given name and replace it. + * @param f the file to create. + */ + public LazyFileOutputStream(File f) { + this(f, false); + } + + /** + * Creates a stream that will eventually write to the file with + * the given name and optionally append to instead of replacing + * it. + * @param file the file to create. + * @param append if true append rather than replace. + */ + public LazyFileOutputStream(File file, boolean append) { + this(file, append, false); + } + + /** + * Creates a stream that will eventually write to the file with + * the given name, optionally append to instead of replacing + * it, and optionally always create a file (even if zero length). + * @param file the file to create. + * @param append if true append rather than replace. + * @param alwaysCreate if true create the file even if nothing to write. + */ + public LazyFileOutputStream(File file, boolean append, + boolean alwaysCreate) { + this.file = file; + this.append = append; + this.alwaysCreate = alwaysCreate; + } + + /** + * Explicitly open the file for writing. + * + * <p>Returns silently if the file has already been opened.</p> + * @throws IOException if there is an error. + */ + public void open() throws IOException { + ensureOpened(); + } + + /** + * Close the file. + * @throws IOException if there is an error. + */ + public synchronized void close() throws IOException { + if (alwaysCreate && !closed) { + ensureOpened(); + } + if (opened) { + fos.close(); + } + closed = true; + } + + /** + * Delegates to the three-arg version. + * @param b the bytearray to write. + * @throws IOException if there is a problem. + */ + public void write(byte[] b) throws IOException { + write(b, 0, b.length); + } + + /** + * Write part of a byte array. + * @param b the byte array. + * @param offset write from this index. + * @param len the number of bytes to write. + * @throws IOException if there is a problem. + */ + public synchronized void write(byte[] b, int offset, int len) + throws IOException { + ensureOpened(); + fos.write(b, offset, len); + } + + /** + * Write a byte. + * @param b the byte to write. + * @throws IOException if there is a problem. + */ + public synchronized void write(int b) throws IOException { + ensureOpened(); + fos.write(b); + } + + private synchronized void ensureOpened() throws IOException { + if (closed) { + throw new IOException(file + " has already been closed."); + } + + if (!opened) { + fos = new FileOutputStream(file.getAbsolutePath(), append); + opened = true; + } + } +} |