concat.java

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/*
 *  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.taskdefs;

import java.io.File;
import java.io.Reader;
import java.io.Writer;
import java.io.FileReader;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.StringReader;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.Vector;

import org.apache.tools.ant.Task;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.ProjectComponent;
import org.apache.tools.ant.filters.util.ChainReaderHelper;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.types.FileSet;
import org.apache.tools.ant.types.FileList;
import org.apache.tools.ant.types.FilterChain;
import org.apache.tools.ant.types.Resource;
import org.apache.tools.ant.types.ResourceCollection;
import org.apache.tools.ant.types.resources.Restrict;
import org.apache.tools.ant.types.resources.Resources;
import org.apache.tools.ant.types.resources.FileResource;
import org.apache.tools.ant.types.resources.StringResource;
import org.apache.tools.ant.types.resources.selectors.Not;
import org.apache.tools.ant.types.resources.selectors.Exists;
import org.apache.tools.ant.types.resources.selectors.ResourceSelector;
import org.apache.tools.ant.util.ConcatResourceInputStream;
import org.apache.tools.ant.util.FileUtils;
import org.apache.tools.ant.util.ReaderInputStream;
import org.apache.tools.ant.util.StringUtils;

/**
 * This class contains the 'concat' task, used to concatenate a series
 * of files into a single stream. The destination of this stream may
 * be the system console, or a file. The following is a sample
 * invocation:
 *
 * <pre>
 * &lt;concat destfile=&quot;${build.dir}/index.xml&quot;
 *   append=&quot;false&quot;&gt;
 *
 *   &lt;fileset dir=&quot;${xml.root.dir}&quot;
 *     includes=&quot;*.xml&quot; /&gt;
 *
 * &lt;/concat&gt;
 * </pre>
 *
 */
public class Concat extends Task implements ResourceCollection {

    // The size of buffers to be used
    private static final int BUFFER_SIZE = 8192;

    private static final FileUtils FILE_UTILS = FileUtils.getFileUtils();

    private static final ResourceSelector EXISTS = new Exists();
    private static final ResourceSelector NOT_EXISTS = new Not(EXISTS);

    /**
     * sub element points to a file or contains text
     */
    public static class TextElement extends ProjectComponent {
        private String   value = "";
        private boolean  trimLeading = false;
        private boolean  trim = false;
        private boolean  filtering = true;
        private String   encoding = null;

        /**
         * whether to filter the text in this element
         * or not.
         *
         * @param filtering true if the text should be filtered.
         *                  the default value is true.
         */
        public void setFiltering(boolean filtering) {
            this.filtering = filtering;
        }

        /** return the filtering attribute */
        private boolean getFiltering() {
            return filtering;
        }

        /**
         * The encoding of the text element
         *
         * @param encoding the name of the charset used to encode
         */
        public void setEncoding(String encoding) {
            this.encoding = encoding;
        }

        /**
         * set the text using a file
         * @param file the file to use
         * @throws BuildException if the file does not exist, or cannot be
         *                        read
         */
        public void setFile(File file) throws BuildException {
            // non-existing files are not allowed
            if (!file.exists()) {
                throw new BuildException("File " + file + " does not exist.");
            }

            BufferedReader reader = null;
            try {
                if (this.encoding == null) {
                    reader = new BufferedReader(new FileReader(file));
                } else {
                    reader = new BufferedReader(
                        new InputStreamReader(new FileInputStream(file),
                                              this.encoding));
                }
                value = FileUtils.safeReadFully(reader);
            } catch (IOException ex) {
                throw new BuildException(ex);
            } finally {
                FileUtils.close(reader);
            }
        }

        /**
         * set the text using inline
         * @param value the text to place inline
         */
        public void addText(String value) {
            this.value += getProject().replaceProperties(value);
        }

        /**
         * s:^\s*:: on each line of input
         * @param strip if true do the trim
         */
        public void setTrimLeading(boolean strip) {
            this.trimLeading = strip;
        }

        /**
         * whether to call text.trim()
         * @param trim if true trim the text
         */
        public void setTrim(boolean trim) {
            this.trim = trim;
        }

        /**
         * @return the text, after possible trimming
         */
        public String getValue() {
            if (value == null) {
                value = "";
            }
            if (value.trim().length() == 0) {
                value = "";
            }
            if (trimLeading) {
                char[] current = value.toCharArray();
                StringBuffer b = new StringBuffer(current.length);
                boolean startOfLine = true;
                int pos = 0;
                while (pos < current.length) {
                    char ch = current[pos++];
                    if (startOfLine) {
                        if (ch == ' ' || ch == '\t') {
                            continue;
                        }
                        startOfLine = false;
                    }
                    b.append(ch);
                    if (ch == '\n' || ch == '\r') {
                        startOfLine = true;
                    }
                }
                value = b.toString();
            }
            if (trim) {
                value = value.trim();
            }
            return value;
        }
    }

    private interface ReaderFactory {
        Reader getReader(Object o) throws IOException;
    }

    /**
     * This class reads from each of the source files in turn.
     * The concatentated result can then be filtered as
     * a single stream.
     */
    private final class MultiReader extends Reader {
        private Reader reader = null;
        private int    lastPos = 0;
        private char[] lastChars = new char[eolString.length()];
        private boolean needAddSeparator = false;
        private Iterator readerSources;
        private ReaderFactory factory;

        private MultiReader(Iterator readerSources, ReaderFactory factory) {
            this.readerSources = readerSources;
            this.factory = factory;
        }

        private Reader getReader() throws IOException {
            if (reader == null && readerSources.hasNext()) {
                reader = factory.getReader(readerSources.next());
                Arrays.fill(lastChars, (char) 0);
            }
            return reader;
        }

        private void nextReader() throws IOException {
            close();
            reader = null;
        }

        /**
         * Read a character from the current reader object. Advance
         * to the next if the reader is finished.
         * @return the character read, -1 for EOF on the last reader.
         * @exception IOException - possibly thrown by the read for a reader
         *            object.
         */
        public int read() throws IOException {
            if (needAddSeparator) {
                int ret = eolString.charAt(lastPos++);
                if (lastPos >= eolString.length()) {
                    lastPos = 0;
                    needAddSeparator = false;
                }
                return ret;
            }
            while (getReader() != null) {
                int ch = getReader().read();
                if (ch == -1) {
                    nextReader();
                    if (isFixLastLine() && isMissingEndOfLine()) {
                        needAddSeparator = true;
                        lastPos = 0;
                    }
                } else {
                    addLastChar((char) ch);
                    return ch;
                }
            }
            return -1;
        }

        /**
         * Read into the buffer <code>cbuf</code>.
         * @param cbuf The array to be read into.
         * @param off The offset.
         * @param len The length to read.
         * @exception IOException - possibly thrown by the reads to the
         *            reader objects.
         */
        public int read(char[] cbuf, int off, int len)
            throws IOException {

            int amountRead = 0;
            while (getReader() != null || needAddSeparator) {
                if (needAddSeparator) {
                    cbuf[off] = eolString.charAt(lastPos++);
                    if (lastPos >= eolString.length()) {
                        lastPos = 0;
                        needAddSeparator = false;
                    }
                    len--;
                    off++;
                    amountRead++;
                    if (len == 0) {
                        return amountRead;
                    }
                    continue;
                }
                int nRead = getReader().read(cbuf, off, len);
                if (nRead == -1 || nRead == 0) {
                    nextReader();
                    if (isFixLastLine() && isMissingEndOfLine()) {
                        needAddSeparator = true;
                        lastPos = 0;
                    }
                } else {
                    if (isFixLastLine()) {
                        for (int i = nRead;
                                 i > (nRead - lastChars.length);
                                 --i) {
                            if (i <= 0) {
                                break;
                            }
                            addLastChar(cbuf[off + i - 1]);
                        }
                    }
                    len -= nRead;
                    off += nRead;
                    amountRead += nRead;
                    if (len == 0) {
                        return amountRead;
                    }
                }
            }
            if (amountRead == 0) {
                return -1;
            } else {
                return amountRead;
            }
        }

        /**
         * Close the current reader
         */
        public void close() throws IOException {
            if (reader != null) {
                reader.close();
            }
        }

        /**
         * if checking for end of line at end of file
         * add a character to the lastchars buffer
         */
        private void addLastChar(char ch) {
            for (int i = lastChars.length - 2; i >= 0; --i) {
                lastChars[i] = lastChars[i + 1];
            }
            lastChars[lastChars.length - 1] = ch;
        }

        /**
         * return true if the lastchars buffer does
         * not contain the lineseparator
         */
        private boolean isMissingEndOfLine() {
            for (int i = 0; i < lastChars.length; ++i) {
                if (lastChars[i] != eolString.charAt(i)) {
                    return true;
                }
            }
            return false;
        }

        private boolean isFixLastLine() {
            return fixLastLine && textBuffer == null;
        }
    }

    private final class ConcatResource extends Resource {
        private ResourceCollection c;

        private ConcatResource(ResourceCollection c) {
            this.c = c;
        }
        public InputStream getInputStream() throws IOException {
            if (binary) {
                ConcatResourceInputStream result = new ConcatResourceInputStream(c);
                result.setManagingComponent(this);
                return result;
            }
            Reader resourceReader = getFilteredReader(
                    new MultiReader(c.iterator(), resourceReaderFactory));
            Reader rdr;
            if (header == null && footer == null) {
                rdr = resourceReader;
            } else {
                int readerCount = 1;
                if (header != null) {
                    readerCount++;
                }
                if (footer != null) {
                    readerCount++;
                }
                Reader[] readers = new Reader[readerCount];
                int pos = 0;
                if (header != null) {
                    readers[pos] = new StringReader(header.getValue());
                    if (header.getFiltering()) {
                        readers[pos] = getFilteredReader(readers[pos]);
                    }
                    pos++;
                }
                readers[pos++] = resourceReader;
                if (footer != null) {
                    readers[pos] = new StringReader(footer.getValue());
                    if (footer.getFiltering()) {
                        readers[pos] = getFilteredReader(readers[pos]);
                    }
                }
                rdr = new MultiReader(Arrays.asList(readers).iterator(),
                        identityReaderFactory);
            }
            return outputEncoding == null ? new ReaderInputStream(rdr)
                    : new ReaderInputStream(rdr, outputEncoding);
        }
        public String getName() {
            return "concat (" + String.valueOf(c) + ")";
        }
    }

    // Attributes.

    /**
     * The destination of the stream. If <code>null</code>, the system
     * console is used.
     */
    private File destinationFile;

    /**
     * Whether or not the stream should be appended if the destination file
     * exists.
     * Defaults to <code>false</code>.
     */
    private boolean append;

    /**
     * Stores the input file encoding.
     */
    private String encoding;

    /** Stores the output file encoding. */
    private String outputEncoding;

    /** Stores the binary attribute */
    private boolean binary;

    // Child elements.

    /**
     * This buffer stores the text within the 'concat' element.
     */
    private StringBuffer textBuffer;

    /**
     * Stores a collection of file sets and/or file lists, used to
     * select multiple files for concatenation.
     */
    private ResourceCollection rc;