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Android example source code file (CharArrayBuffers.java)

This example Android source code file (CharArrayBuffers.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

a, chararraybuffers, string, z

The CharArrayBuffers.java Android example source code

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * 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 android.net.http;

import org.apache.http.util.CharArrayBuffer;
import org.apache.http.protocol.HTTP;

/**
 * Utility methods for working on CharArrayBuffers.
 * 
 * {@hide}
 */
class CharArrayBuffers {

    static final char uppercaseAddon = 'a' - 'A';

    /**
     * Returns true if the buffer contains the given string. Ignores leading
     * whitespace and case.
     *
     * @param buffer to search
     * @param beginIndex index at which we should start
     * @param str to search for
     */
    static boolean containsIgnoreCaseTrimmed(CharArrayBuffer buffer,
            int beginIndex, final String str) {
        int len = buffer.length();
        char[] chars = buffer.buffer();
        while (beginIndex < len && HTTP.isWhitespace(chars[beginIndex])) {
            beginIndex++;
        }
        int size = str.length();
        boolean ok = len >= beginIndex + size;
        for (int j=0; ok && (j<size); j++) {
            char a = chars[beginIndex+j];
            char b = str.charAt(j);
            if (a != b) {
                a = toLower(a);
                b = toLower(b);
                ok = a == b;
            }
        }
        return ok;
    }

    /**
     * Returns index of first occurence ch. Lower cases characters leading up
     * to first occurrence of ch.
     */
    static int setLowercaseIndexOf(CharArrayBuffer buffer, final int ch) {

        int beginIndex = 0;
        int endIndex = buffer.length();
        char[] chars = buffer.buffer();

        for (int i = beginIndex; i < endIndex; i++) {
            char current = chars[i];
            if (current == ch) {
                return i;
            } else if (current >= 'A' && current <= 'Z'){
                // make lower case
                current += uppercaseAddon;
                chars[i] = current;
            }
        }
        return -1;
    }

    private static char toLower(char c) {
        if (c >= 'A' && c <= 'Z'){
            c += uppercaseAddon;
        }
        return c;
    }
}

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