org.eclipse.birt.report.model.parser.Base64PropertyState.java Source code

Introduction

Here is the source code for org.eclipse.birt.report.model.parser.Base64PropertyState.java

Source

/*******************************************************************************
 * Copyright (c) 2004 Actuate Corporation.
 * 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
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/

package org.eclipse.birt.report.model.parser;

import java.io.UnsupportedEncodingException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.codec.binary.Base64;
import org.eclipse.birt.report.model.api.core.IStructure;
import org.eclipse.birt.report.model.api.util.StringUtil;
import org.eclipse.birt.report.model.core.DesignElement;
import org.eclipse.birt.report.model.metadata.PropertyDefn;
import org.xml.sax.SAXException;

/**
 * Parses the property that is encoded with base 64.
 */

public class Base64PropertyState extends CompatiblePropertyState {

    /**
     * The base 64 codec.
     */

    private Base64 base = new Base64();

    /**
     * Charset of the string.
     */

    private final String charSet;

    /**
     * Constructor.
     * 
     * @param theHandler
     * @param element
     * @param charSet
     */

    Base64PropertyState(ModuleParserHandler theHandler, DesignElement element, String charSet) {
        super(theHandler, element);
        assert charSet != null;
        this.charSet = charSet;
    }

    /**
     * Constructor.
     * 
     * @param theHandler
     * @param element
     * @param propDefn
     * @param struct
     * @param charSet
     */

    Base64PropertyState(ModuleParserHandler theHandler, DesignElement element, PropertyDefn propDefn,
            IStructure struct, String charSet) {
        super(theHandler, element, propDefn, struct);
        assert charSet != null;
        this.charSet = charSet;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.birt.report.model.util.AbstractParseState#end()
     */

    public void end() throws SAXException {
        String value = text.toString();
        value = getDecodedBase64Value(value);

        super.doEnd(value);
    }

    /**
     * Sets the image data value as base 64 string.
     * 
     * @param value
     *            the value to set
     */

    private String getDecodedBase64Value(String value) {
        String encodedValue = StringUtil.trimString(value);
        if (encodedValue == null)
            return null;

        // replace whitespace with the empty string.
        Pattern p = Pattern.compile("\\s"); //$NON-NLS-1$
        Matcher m = p.matcher(encodedValue);
        encodedValue = m.replaceAll(""); //$NON-NLS-1$

        byte[] data = null;

        try {
            data = base.decode(encodedValue.getBytes(charSet));
            if (data == null)
                return null;

            return new String(data, charSet);
        } catch (UnsupportedEncodingException e) {
            assert false;
            return null;
        }
    }
}