Java XML String Transform toString(Collection c, String separator)

Description

Converts collection to a separated string.

License

Open Source License

Parameter

Parameter	Description
c	collection
separator	string to separate items

Return

collection items separated with given separator

Declaration

public static String toString(Collection<String> c, String separator) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2004, 2013 Richard Hoefter and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * /*from w ww.  j a  v a  2 s  .  co m*/
 * Contributors:
 *     Richard Hoefter (richard.hoefter@web.de) - initial API and implementation, bug 95300, bug 95297, bug 128104, bug 201180, bug 288830 
 *     IBM Corporation - NLS'ing and incorporating into Eclipse. 
 *                     - Bug 177833 Class created from combination of all utility classes of contribution 
 *                     - Bug 267459 Java project with an external jar file from C:\ on the build path throws a NPE during the Ant Buildfile generation.
 *                     - bug fixing
 *******************************************************************************/

import java.io.StringWriter;

import java.util.Collection;

import java.util.Iterator;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;

public class Main {
    /**
     * Convert document to formatted XML string.
     */
    public static String toString(Document doc)
            throws TransformerConfigurationException, TransformerFactoryConfigurationError, TransformerException {
        // NOTE: There are different transformer implementations in the wild,
        // which are configured differently
        // regarding the indent size:
        // Java 1.4: org.apache.xalan.transformer.TransformerIdentityImpl
        // Java 1.5:
        // com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl

        StringWriter writer = new StringWriter();
        Source source = new DOMSource(doc);
        Result result = new StreamResult(writer);
        TransformerFactory factory = TransformerFactory.newInstance();
        boolean indentFallback = false;
        try {
            // indent using TransformerImpl
            factory.setAttribute("indent-number", "4"); //$NON-NLS-1$ //$NON-NLS-2$
        } catch (IllegalArgumentException e) {
            // option not supported, set indent size below
            indentFallback = true;
        }
        Transformer transformer = factory.newTransformer();
        transformer.setOutputProperty(OutputKeys.INDENT, "yes"); //$NON-NLS-1$
        if (indentFallback) {
            // indent using TransformerIdentityImpl
            transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4"); //$NON-NLS-1$ //$NON-NLS-2$
        }
        transformer.transform(source, result);
        return writer.toString();
    }

    /**
     * Converts collection to a separated string.
     * 
     * @param c
     *            collection
     * @param separator
     *            string to separate items
     * @return collection items separated with given separator
     */
    public static String toString(Collection<String> c, String separator) {
        StringBuffer b = new StringBuffer();
        for (Iterator<String> iter = c.iterator(); iter.hasNext();) {
            b.append(iter.next());
            b.append(separator);
        }
        if (c.size() > 0) {
            b.delete(b.length() - separator.length(), b.length());
        }
        return b.toString();
    }
}

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