DaisySection.java

package org.androiddaisyreader.model;

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

public class DaisySection extends Section {

    public DaisySection() {
        // Use the Builder... not me...
    }

    public String getSmilFilename() {
        String[] values = splitHref(href);
        String smilFilename = values[0];
        return isSmilFilenameValid(smilFilename) ? smilFilename : null;
    }

    /**
     * Splits a Smil href. The href should be into 2 parts, the filename and the
     * id used to locate elements.
     * 
     * @return an array of string values split on the separator "#"
     */
    private String[] splitHref(String href) {
        return href.split("#");
    }

    /**
     * Gets the parts.
     * 
     * @param isDaisyFormat202 the is daisy format202 otherwise is daisy format
     * @return the parts
     */
    public Part[] getParts(boolean isDaisyFormat202) {
        try {
            if (isDaisyFormat202) {
                return Smil10Specification.getParts(bookContext,
                        bookContext.getResource(getSmilFilename()));
            } else {
                return Smil30Specification.getParts(bookContext,
                        bookContext.getResource(getSmilFilename()));
            }
        } catch (IOException e) {
            // TODO 20120301 jharty: refactor once I've sorted out the custom
            // exceptions
            throw new RuntimeException(e);
        }
    }

    public boolean hasParts() {
        return false;
    }

    /**
     * Checks if the SmilHref seems Valid
     * 
     * @param href in the format filename.smil#id
     * @return true if the SmilHref seems valid, else false.
     */
    private boolean isSmilHrefValid(String href) {
        String[] values = splitHref(href);
        if (values.length != 2) {
            return false;
        }
        if (!isSmilFilenameValid(values[0])) {
            return false;
        }
        // We can add more checks here. For now declare victory.
        return true;
    }

    /**
     * Simple helper method to validate the smil filename.
     * 
     * We can enhance this to suit our needs.
     * 
     * @param smilFilename
     * @return true if the filename seems to represent a smil file, else false.
     */
    public boolean isSmilFilenameValid(String smilFilename) {
        if (smilFilename.endsWith(".smil")) {
            return true;
        }
        return false;
    }

    public static class Builder {
        private DaisySection newInstance = new DaisySection();

        public Builder() {
            newInstance.navigables = new ArrayList<Navigable>();
        }

        public Builder addSection(Section section) {
            newInstance.navigables.add(section);
            return this;
        }

        public Builder setLevel(int level) {
            // Consider adding logic to protect the integrity of this Section
            newInstance.level = level;
            return this;
        }

        public Builder setParent(Navigable parent) {
            newInstance.parent = parent;
            return this;
        }

        public Builder setContext(BookContext context) {
            newInstance.bookContext = context;
            return this;
        }

        public Builder setTitle(String title) {
            newInstance.title = title;
            return this;
        }

        public DaisySection build() {
            return newInstance;
        }

        public int getLevel() {
            return newInstance.level;
        }

        public Builder setId(String id) {
            newInstance.id = id;
            return this;

        }

        public Builder setHref(String href) {
            if (newInstance.isSmilHrefValid(href)) {
                newInstance.href = href;
                return this;
            } else {
                throw new IllegalArgumentException(String.format(
                        "Smil Filename [%s] seems invalid", href));
            }
        }
    }
}