Usage of new API, cleanups (reduced)

src/com/github/rjeschke/neetutils/Strings.java

+/*
+ * Copyright (C) 2012 René Jeschke <rene_jeschke@yahoo.de>
+ *
+ * Licensed 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 com.github.rjeschke.neetutils;
+
+import java.io.UnsupportedEncodingException;
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * String utility methods.
+ *
+ * @author René Jeschke (rene_jeschke@yahoo.de)
+ */
+public class Strings
+{
+    /**
+     * Produces a in Java usable string representation of the given String, wrapping it in quotes and escaping all relevant characters.
+     *
+     * @param str
+     *            The String to escape.
+     * @return Escape String or &quote;null&quote; if str is <code>null</code>
+     */
+    public final static String escapeString(final String str)
+    {
+        if (str == null)
+        {
+          return "null";
+        }
+
+        final StringBuilder sb = new StringBuilder();
+
+        sb.append('"');
+        for (int i = 0; i < str.length(); i++)
+        {
+            final char c = str.charAt(i);
+            switch (c)
+            {
+            case '\b':
+                sb.append("\\b");
+                break;
+            case '\f':
+                sb.append("\\f");
+                break;
+            case '\t':
+                sb.append("\\t");
+                break;
+            case '\n':
+                sb.append("\\n");
+                break;
+            case '\r':
+                sb.append("\\r");
+                break;
+            case '"':
+                sb.append("\\\"");
+                break;
+            default:
+                sb.append(c);
+                break;
+            }
+        }
+        sb.append('"');
+
+        return sb.toString();
+    }
+
+    public final static String replace(final String str, final char oldChar, final char newChar)
+    {
+        final StringBuilder sb = new StringBuilder();
+
+        for (int i = 0; i < str.length(); i++)
+        {
+            final char ch = str.charAt(i);
+            if (ch == oldChar)
+            {
+                sb.append(newChar);
+            }
+            else
+            {
+                sb.append(ch);
+            }
+        }
+
+        return sb.toString();
+    }
+
+    public final static List<String> split(final String str, final char ch)
+    {
+        final List<String> ret = new ArrayList<String>();
+
+        if (str != null)
+        {
+            int s = 0, e = 0;
+            while (e < str.length())
+            {
+                if (str.charAt(e) == ch)
+                {
+                    ret.add(str.substring(s, e));
+                    s = e + 1;
+                }
+                e++;
+            }
+            ret.add(str.substring(s, e));
+        }
+
+        return ret;
+    }
+
+    public final static List<String> trim(final List<String> strings)
+    {
+        for (int i = 0; i < strings.size(); i++)
+        {
+            final String s = strings.get(i);
+            if (s != null)
+            {
+                strings.set(i, s.trim());
+            }
+        }
+        return strings;
+    }
+
+    public final static boolean isEmpty(final String str)
+    {
+        return str == null || str.length() == 0;
+    }
+
+    public final static String collapseWhitespace(final String str)
+    {
+        final StringBuilder sb = new StringBuilder();
+        boolean wasWs = false;
+        for (int i = 0; i < str.length(); i++)
+        {
+            final char c = str.charAt(i);
+            if (Character.isWhitespace(c) || Character.isSpaceChar(c))
+            {
+                if (!wasWs)
+                {
+                    sb.append(' ');
+                    wasWs = true;
+                }
+            }
+            else
+            {
+                wasWs = false;
+                sb.append(c);
+            }
+        }
+        return sb.toString();
+    }
+
+    public final static String join(final Iterable<String> iterable, final String glue)
+    {
+        final StringBuilder sb = new StringBuilder();
+        int index = 0;
+        for (final String s : iterable)
+        {
+            if (index > 0)
+            {
+                sb.append(glue);
+            }
+            sb.append(s);
+            ++index;
+        }
+
+        return sb.toString();
+    }
+
+    public final static String join(final Iterable<String> iterable)
+    {
+        final StringBuilder sb = new StringBuilder();
+
+        for (final String s : iterable)
+        {
+            sb.append(s);
+        }
+
+        return sb.toString();
+    }
+
+    public final static List<String> splitLength(final String str, final int len)
+    {
+        final List<String> ret = new ArrayList<String>();
+        int todo = str.length();
+        int pos = 0;
+        while (todo > 0)
+        {
+            final int n = Math.min(todo, len);
+            ret.add(str.substring(pos, pos + n));
+            pos += n;
+            todo -= n;
+        }
+        return ret;
+    }
+
+    public final static int firstDiffIndex(final String a, final String b)
+    {
+        final int todo = Math.min(a.length(), b.length());
+        int i = 0;
+        for (; i < todo; i++)
+        {
+            if (a.charAt(i) != b.charAt(i))
+            {
+                break;
+            }
+        }
+        return i;
+    }
+
+    public final static String from(final byte[] bytes, final int offs, final int length, final Charset charset) throws UnsupportedEncodingException
+    {
+        return new String(bytes, offs, length, charset.name());
+    }
+
+    public final static String from(final byte[] bytes, final Charset charset) throws UnsupportedEncodingException
+    {
+        return new String(bytes, charset.name());
+    }
+
+    public final static String from(final byte[] bytes, final int offs, final int length) throws UnsupportedEncodingException
+    {
+        return new String(bytes, offs, length, Charsets.UTF8.name());
+    }
+
+    public final static String from(final byte[] bytes) throws UnsupportedEncodingException
+    {
+        return new String(bytes, Charsets.UTF8.name());
+    }
+}