Example usage for javax.json JsonReaderFactory createReader

Introduction

In this page you can find the example usage for javax.json JsonReaderFactory createReader.

Prototype

JsonReader createReader(InputStream in);

Source Link

Document

Creates a JSON reader from a byte stream.

Usage

From source file:org.apache.johnzon.maven.plugin.ExampleToModelMojo.java

private void generate(final JsonReaderFactory readerFactory, final File source, final Writer writer,
        final String javaName) throws MojoExecutionException {
    JsonReader reader = null;// w w w .  java  2s.  com
    try {
        reader = readerFactory.createReader(new FileReader(source));
        final JsonStructure structure = reader.read();
        if (JsonArray.class.isInstance(structure) || !JsonObject.class.isInstance(structure)) { // quite redundant for now but to avoid surprises in future
            throw new MojoExecutionException(
                    "This plugin doesn't support array generation, generate the model (generic) and handle arrays in your code");
        }

        final JsonObject object = JsonObject.class.cast(structure);
        final Collection<String> imports = new TreeSet<String>();

        // while we browse the example tree just store imports as well, avoids a 2 passes processing duplicating imports logic
        final StringWriter memBuffer = new StringWriter();
        generateFieldsAndMethods(memBuffer, object, "    ", imports);

        if (header != null) {
            writer.write(header);
            writer.write('\n');
        }

        writer.write("package " + packageBase + ";\n\n");

        if (!imports.isEmpty()) {
            for (final String imp : imports) {
                writer.write("import " + imp + ";\n");
            }
            writer.write('\n');
        }

        writer.write("public class " + javaName + " {\n");
        writer.write(memBuffer.toString());
        writer.write("}\n");
    } catch (final IOException e) {
        throw new MojoExecutionException(e.getMessage(), e);
    } finally {
        if (reader != null) {
            reader.close();
        }
    }
}

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