com.newtranx.util.xml.XmlFilterReader.java Source code

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Here is the source code for com.newtranx.util.xml.XmlFilterReader.java

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/*
 * Copyright 2016 NewTranx Co. Ltd.
 *
 * 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.newtranx.util.xml;

import java.io.IOException;
import java.io.Reader;
import java.util.ArrayList;

import org.apache.commons.lang3.ArrayUtils;
import org.apache.xerces.util.XMLChar;

public class XmlFilterReader extends Reader {

    private Reader underlying;

    private ArrayList<Integer> toRemove = new ArrayList<Integer>();

    public XmlFilterReader(Reader underlying) {
        this.underlying = underlying;
    }

    @Override
    public int read(char[] cbuf, int off, int len) throws IOException {
        int ret = underlying.read(cbuf, off, len);
        for (int i = off; i < off + ret; i++) {
            if (!isValid(cbuf[i]))
                toRemove.add(i);
        }
        if (!toRemove.isEmpty()) {
            int[] indices = new int[toRemove.size()];
            for (int i = 0; i < indices.length; i++) {
                indices[i] = toRemove.get(i);
            }
            toRemove.clear();
            ret -= indices.length;
            char[] newArr = ArrayUtils.removeAll(cbuf, indices);
            System.arraycopy(newArr, off, cbuf, off, ret);
        }
        return ret;
    }

    @Override
    public void close() throws IOException {
        underlying.close();
    }

    private boolean isValid(char c) {
        return XMLChar.isValid(c);
    }

}