org.formix.dsx.XmlText.java Source code

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/****************************************************************************
 * Copyright 2009-2015 Jean-Philippe Gravel, P. Eng. CSDP
 * 
 * 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 org.formix.dsx;

import java.io.IOException;
import java.io.Writer;

import org.apache.commons.lang.NullArgumentException;
import org.apache.commons.lang.StringEscapeUtils;
import org.formix.dsx.utils.SUID;

/**
 * Represents a text within the XML tree.
 * 
 * @author jpgravel
 *
 */
public class XmlText implements XmlContent {

    private long id;
    private StringBuilder text;

    /**
     * Creates an empty XmlText instance.
     */
    public XmlText() {
        this("");
    }

    /**
     * Creates an XmlText instance with the given text.
     * 
     * @param text
     *            The text used to initialize this XmlText instance.
     */
    public XmlText(String text) {
        if (text == null) {
            throw new NullArgumentException("text");
        }
        this.text = new StringBuilder(text);
        this.id = -1;
    }

    @Override
    public long getId() {
        if (this.id == -1) {
            this.id = SUID.nextId();
        }
        return this.id;
    }

    /**
     * Gets the text value.
     * 
     * @return the text value;
     */
    public String getText() {
        return this.text.toString();
    }

    /**
     * Sets the text value.
     * 
     * @param text
     *            the text value.
     */
    public void setText(String text) {
        this.text = new StringBuilder(text);
    }

    /**
     * Appends a string to the current text.
     * 
     * @param value
     *            the string to append.
     */
    public void append(String value) {
        this.text.append(value);
    }

    @Override
    public String toXml() {
        return StringEscapeUtils.escapeXml(this.getText());
    }

    @Override
    public void write(Writer writer) throws IOException {
        writer.append(this.toXml());
    }

    @Override
    public String toString() {
        return this.getText();
    }

    @Override
    public boolean equals(Object o) {
        if (o == null)
            return false;
        if (!(o instanceof XmlText))
            return false;
        XmlText other = (XmlText) o;
        return this.id == other.id && this.toString().equals(other.toString());
    }

    @Override
    public int hashCode() {
        return this.getClass().getName().hashCode() ^ Long.hashCode(this.getId());
    }

}