moving files around

common/common-io/src/main/java/com/twelvemonkeys/io/StringArrayReader.java

@@ -0,0 +1,185 @@
+/*
+ * Copyright (c) 2008, Harald Kuhr
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name "TwelveMonkeys" nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package com.twelvemonkeys.io;
+
+import java.io.StringReader;
+import java.io.IOException;
+import java.io.Reader;
+
+/**
+ * StringArrayReader
+ * <p/>
+ *
+ * @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
+ * @author last modified by $Author: haku $
+ * @version $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/io/StringArrayReader.java#2 $
+ */
+public class StringArrayReader extends StringReader {
+
+    private StringReader mCurrent;
+    private String[] mStrings;
+    protected final Object mLock;
+    private int mCurrentSting;
+    private int mMarkedString;
+    private int mMark;
+    private int mNext;
+
+    /**
+     * Create a new string array reader.
+     *
+     * @param pStrings {@code String}s providing the character stream.
+     */
+    public StringArrayReader(final String[] pStrings) {
+        super("");
+        if (pStrings == null) {
+            throw new NullPointerException("strings == null");
+        }
+
+        mLock = lock = pStrings; // NOTE: It's ok to sync on pStrings, as the
+                                 // reference can't change, only it's elements
+
+        mStrings = pStrings.clone(); // Defensive copy for content
+        nextReader();
+    }
+
+    protected final Reader nextReader() {
+        if (mCurrentSting >= mStrings.length) {
+            mCurrent = new EmptyReader();
+        }
+        else {
+            mCurrent = new StringReader(mStrings[mCurrentSting++]);
+        }
+        // NOTE: Reset mNext for every reader, and record marked reader in mark/reset methods!
+        mNext = 0;
+        
+        return mCurrent;
+    }
+
+    /**
+     * Check to make sure that the stream has not been closed
+     *
+     * @throws IOException if the stream is closed
+     */
+    protected final void ensureOpen() throws IOException {
+        if (mStrings == null) {
+            throw new IOException("Stream closed");
+        }
+    }
+
+    public void close() {
+        super.close();
+        mStrings = null;
+        mCurrent.close();
+    }
+
+    public void mark(int pReadLimit) throws IOException {
+        if (pReadLimit < 0){
+            throw new IllegalArgumentException("Read limit < 0");
+        }
+
+        synchronized (mLock) {
+            ensureOpen();
+            mMark = mNext;
+            mMarkedString = mCurrentSting;
+
+            mCurrent.mark(pReadLimit);
+        }
+    }
+
+    public void reset() throws IOException {
+        synchronized (mLock) {
+            ensureOpen();
+
+            if (mCurrentSting != mMarkedString) {
+                mCurrentSting = mMarkedString - 1;
+                nextReader();
+                mCurrent.skip(mMark);
+            }
+            else {
+                mCurrent.reset();
+            }
+
+            mNext = mMark;
+        }
+    }
+
+    public boolean markSupported() {
+        return true;
+    }
+
+    public int read() throws IOException {
+        synchronized (mLock) {
+            int read = mCurrent.read();
+
+            if (read < 0 && mCurrentSting < mStrings.length) {
+                nextReader();
+                return read(); // In case of empty strings
+            }
+
+            mNext++;
+
+            return read;
+        }
+    }
+
+    public int read(char pBuffer[], int pOffset, int pLength) throws IOException {
+        synchronized (mLock) {
+            int read = mCurrent.read(pBuffer, pOffset, pLength);
+
+            if (read < 0 && mCurrentSting < mStrings.length) {
+                nextReader();
+                return read(pBuffer, pOffset, pLength); // In case of empty strings
+            }
+
+            mNext += read;
+
+            return read;
+        }
+    }
+
+    public boolean ready() throws IOException {
+        return mCurrent.ready();
+    }
+
+    public long skip(long pChars) throws IOException {
+        synchronized (mLock) {
+            long skipped = mCurrent.skip(pChars);
+
+            if (skipped == 0 && mCurrentSting < mStrings.length) {
+                nextReader();
+                return skip(pChars);
+            }
+
+            mNext += skipped;
+
+            return skipped;
+        }
+    }
+
+}