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/*
 * Copyright 2003-2017 MarkLogic Corporation
 *
 * 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.marklogic.dom;

import org.w3c.dom.CharacterData;
import org.w3c.dom.DOMException;

import com.marklogic.tree.ExpandedTree;

/**
 * A read-only W3C DOM Node implementation of MarkLogic's internal
 * representation of character data as stored in the expanded tree cache of a
 * forest on disk.
 * 
 * 
 * This interface is effectively read-only. Setters and update methods inherited
 * from org.w3c.Node are not supported and will raise an exception
 * if called.
 * 
 * 
 * @author jchen
 */
public abstract class CharacterDataImpl extends NodeImpl implements
    CharacterData {

    public CharacterDataImpl(ExpandedTree tree, int node) {
        super(tree, node);
    }

    /** Unsupported. */
    public void appendData(String arg) throws DOMException {
        throw new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR, null);
    }

    /** Unsupported. */
    public void deleteData(int offset, int count) throws DOMException {
        throw new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR, null);
    }

    public String getData() throws DOMException {
        return tree.getText(tree.nodeRepID[node]);
    }

    /** {@inheritDoc} */
    public int getLength() {
        return getData().length();
    }

    /** {@inheritDoc} */
    @Override
    public String getNodeValue() throws DOMException {
        return getData();
    }

    /** Unsupported. */
    public void insertData(int offset, String arg) throws DOMException {
        throw new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR, null);
    }

    /** Unsupported. */
    public void replaceData(int offset, int count, String arg)
        throws DOMException {
        throw new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR, null);
    }

    /** Unsupported. */
    public void setData(String data) throws DOMException {
        throw new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR, null);
    }

    /** {@inheritDoc} */
    public String substringData(int offset, int count) throws DOMException {
        if ((offset < 0) || (count < 0)) {
            throw new DOMException(DOMException.INDEX_SIZE_ERR, null);
        }
        String data = getData();
        if (offset > data.length()) {
            throw new DOMException(DOMException.INDEX_SIZE_ERR, null);
        }
        if (offset + count > data.length()) {
            return data.substring(offset);
        } else {
            return data.substring(offset, offset + count);
        }
    }
}