Initial Jack import.

Change-Id: I953cf0a520195a7187d791b2885848ad0d5a9b43

1 files changed, 164 insertions, 0 deletions

diff --git a/guava/src/com/google/common/base/CaseFormat.java b/guava/src/com/google/common/base/CaseFormat.java
new file mode 100644
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+++ b/guava/src/com/google/common/base/CaseFormat.java
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+/*
+ * Copyright (C) 2006 The Guava Authors
+ *
+ * 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.google.common.base;
+
+import com.google.common.annotations.GwtCompatible;
+
+/**
+ * Utility class for converting between various ASCII case formats.
+ *
+ * @author Mike Bostock
+ * @since 1.0
+ */
+@GwtCompatible
+public enum CaseFormat {
+  /**
+   * Hyphenated variable naming convention, e.g., "lower-hyphen".
+   */
+  LOWER_HYPHEN(CharMatcher.is('-'), "-"),
+
+  /**
+   * C++ variable naming convention, e.g., "lower_underscore".
+   */
+  LOWER_UNDERSCORE(CharMatcher.is('_'), "_"),
+
+  /**
+   * Java variable naming convention, e.g., "lowerCamel".
+   */
+  LOWER_CAMEL(CharMatcher.inRange('A', 'Z'), ""),
+
+  /**
+   * Java and C++ class naming convention, e.g., "UpperCamel".
+   */
+  UPPER_CAMEL(CharMatcher.inRange('A', 'Z'), ""),
+
+  /**
+   * Java and C++ constant naming convention, e.g., "UPPER_UNDERSCORE".
+   */
+  UPPER_UNDERSCORE(CharMatcher.is('_'), "_");
+
+  private final CharMatcher wordBoundary;
+  private final String wordSeparator;
+
+  CaseFormat(CharMatcher wordBoundary, String wordSeparator) {
+    this.wordBoundary = wordBoundary;
+    this.wordSeparator = wordSeparator;
+  }
+
+  /**
+   * Converts the specified {@code String s} from this format to the specified {@code format}. A
+   * "best effort" approach is taken; if {@code s} does not conform to the assumed format, then the
+   * behavior of this method is undefined but we make a reasonable effort at converting anyway.
+   */
+  public String to(CaseFormat format, String s) {
+    if (format == null) {
+      throw new NullPointerException();
+    }
+    if (s == null) {
+      throw new NullPointerException();
+    }
+
+    if (format == this) {
+      return s;
+    }
+
+    /* optimize cases where no camel conversion is required */
+    switch (this) {
+      case LOWER_HYPHEN:
+        switch (format) {
+          case LOWER_UNDERSCORE:
+            return s.replace('-', '_');
+          case UPPER_UNDERSCORE:
+            return Ascii.toUpperCase(s.replace('-', '_'));
+        }
+        break;
+      case LOWER_UNDERSCORE:
+        switch (format) {
+          case LOWER_HYPHEN:
+            return s.replace('_', '-');
+          case UPPER_UNDERSCORE:
+            return Ascii.toUpperCase(s);
+        }
+        break;
+      case UPPER_UNDERSCORE:
+        switch (format) {
+          case LOWER_HYPHEN:
+            return Ascii.toLowerCase(s.replace('_', '-'));
+          case LOWER_UNDERSCORE:
+            return Ascii.toLowerCase(s);
+        }
+        break;
+    }
+
+    // otherwise, deal with camel conversion
+    StringBuilder out = null;
+    int i = 0;
+    int j = -1;
+    while ((j = wordBoundary.indexIn(s, ++j)) != -1) {
+      if (i == 0) {
+        // include some extra space for separators
+        out = new StringBuilder(s.length() + 4 * wordSeparator.length());
+        out.append(format.normalizeFirstWord(s.substring(i, j)));
+      } else {
+        out.append(format.normalizeWord(s.substring(i, j)));
+      }
+      out.append(format.wordSeparator);
+      i = j + wordSeparator.length();
+    }
+    if (i == 0) {
+      return format.normalizeFirstWord(s);
+    }
+    out.append(format.normalizeWord(s.substring(i)));
+    return out.toString();
+  }
+
+  private String normalizeFirstWord(String word) {
+    switch (this) {
+      case LOWER_CAMEL:
+        return Ascii.toLowerCase(word);
+      default:
+        return normalizeWord(word);
+    }
+  }
+
+  private String normalizeWord(String word) {
+    switch (this) {
+      case LOWER_HYPHEN:
+        return Ascii.toLowerCase(word);
+      case LOWER_UNDERSCORE:
+        return Ascii.toLowerCase(word);
+      case LOWER_CAMEL:
+        return firstCharOnlyToUpper(word);
+      case UPPER_CAMEL:
+        return firstCharOnlyToUpper(word);
+      case UPPER_UNDERSCORE:
+        return Ascii.toUpperCase(word);
+    }
+    throw new RuntimeException("unknown case: " + this);
+  }
+
+  private static String firstCharOnlyToUpper(String word) {
+    int length = word.length();
+    if (length == 0) {
+      return word;
+    }
+    return new StringBuilder(length)
+        .append(Ascii.toUpperCase(word.charAt(0)))
+        .append(Ascii.toLowerCase(word.substring(1)))
+        .toString();
+  }
+}