/*-
 * ============LICENSE_START=======================================================
 * ONAP : APPC
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Copyright (C) 2017 Amdocs
 * =============================================================================
 * 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.
 * 
 * ECOMP is a trademark and service mark of AT&T Intellectual Property.
 * ============LICENSE_END=========================================================
 */

package org.onap.appc.executor.impl;

import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.HashMap;


class CommonMethods {

    private static final HashMap m = new HashMap();

    static {
        m.put(34, "&quot;"); // < - less-than
        m.put(60, "&lt;");   // < - less-than
        m.put(62, "&gt;");   // > - greater-than
        m.put(38, "&amp;");   // & - Ampersand
    }

    static String escapeHtml(String source) {
        try {
            StringWriter writer = new StringWriter((int) (source.length() * 1.5));
            escape(writer, source);
            return writer.toString();
        } catch (IOException ioe) {
            ioe.printStackTrace();
            return null;
        }
    }

    private static void escape(Writer writer, String str) throws IOException {
        int len = str.length();
        for (int i = 0; i < len; i++) {
            char c = str.charAt(i);
            int ascii = (int) c;
            String entityName = (String) m.get(ascii);
            if (entityName == null) {
                if (c > 0x7F) {
                    writer.write("&#");
                    writer.write(Integer.toString(c, 10));
                    writer.write(';');
                } else {
                    writer.write(c);
                }
            } else {
                writer.write(entityName);
            }
        }
    }

}