specification.java

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/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.apache.tools.ant.taskdefs.optional.extension;

import java.text.ParseException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.Map;
import java.util.jar.Attributes;
import java.util.jar.Manifest;

import org.apache.tools.ant.util.StringUtils;

/**
 * <p>Utility class that represents either an available "Optional Package"
 * (formerly known as "Standard Extension") as described in the manifest
 * of a JAR file, or the requirement for such an optional package.</p>
 *
 * <p>For more information about optional packages, see the document
 * <em>Optional Package Versioning</em> in the documentation bundle for your
 * Java2 Standard Edition package, in file
 * <code>guide/extensions/versioning.html</code>.</p>
 *
 */
public final class Specification {

    private static final String MISSING = "Missing ";

    /**
     * Manifest Attribute Name object for SPECIFICATION_TITLE.
     */
    public static final Attributes.Name SPECIFICATION_TITLE
        = Attributes.Name.SPECIFICATION_TITLE;

    /**
     * Manifest Attribute Name object for SPECIFICATION_VERSION.
     */
    public static final Attributes.Name SPECIFICATION_VERSION
        = Attributes.Name.SPECIFICATION_VERSION;

    /**
     * Manifest Attribute Name object for SPECIFICATION_VENDOR.
     */
    public static final Attributes.Name SPECIFICATION_VENDOR
        = Attributes.Name.SPECIFICATION_VENDOR;

    /**
     * Manifest Attribute Name object for IMPLEMENTATION_TITLE.
     */
    public static final Attributes.Name IMPLEMENTATION_TITLE
        = Attributes.Name.IMPLEMENTATION_TITLE;

    /**
     * Manifest Attribute Name object for IMPLEMENTATION_VERSION.
     */
    public static final Attributes.Name IMPLEMENTATION_VERSION
        = Attributes.Name.IMPLEMENTATION_VERSION;

    /**
     * Manifest Attribute Name object for IMPLEMENTATION_VENDOR.
     */
    public static final Attributes.Name IMPLEMENTATION_VENDOR
        = Attributes.Name.IMPLEMENTATION_VENDOR;

    /**
     * Enum indicating that extension is compatible with other Package
     * Specification.
     */
    public static final Compatibility COMPATIBLE =
        new Compatibility("COMPATIBLE");

    /**
     * Enum indicating that extension requires an upgrade
     * of specification to be compatible with other Package Specification.
     */
    public static final Compatibility REQUIRE_SPECIFICATION_UPGRADE =
        new Compatibility("REQUIRE_SPECIFICATION_UPGRADE");

    /**
     * Enum indicating that extension requires a vendor
     * switch to be compatible with other Package Specification.
     */
    public static final Compatibility REQUIRE_VENDOR_SWITCH =
        new Compatibility("REQUIRE_VENDOR_SWITCH");

    /**
     * Enum indicating that extension requires an upgrade
     * of implementation to be compatible with other Package Specification.
     */
    public static final Compatibility REQUIRE_IMPLEMENTATION_CHANGE =
        new Compatibility("REQUIRE_IMPLEMENTATION_CHANGE");

    /**
     * This enum indicates that an extension is incompatible with
     * other Package Specification in ways other than other enums
     * indicate. For example, the other Package Specification
     * may have a different ID.
     */
    public static final Compatibility INCOMPATIBLE =
        new Compatibility("INCOMPATIBLE");

    /**
     * The name of the Package Specification.
     */
    private String specificationTitle;

    /**
     * The version number (dotted decimal notation) of the specification
     * to which this optional package conforms.
     */
    private DeweyDecimal specificationVersion;

    /**
     * The name of the company or organization that originated the
     * specification to which this specification conforms.
     */
    private String specificationVendor;

    /**
     * The title of implementation.
     */
    private String implementationTitle;

    /**
     * The name of the company or organization that produced this
     * implementation of this specification.
     */
    private String implementationVendor;

    /**
     * The version string for implementation. The version string is
     * opaque.
     */
    private String implementationVersion;

    /**
     * The sections of jar that the specification applies to.
     */
    private String[] sections;

    /**
     * Return an array of <code>Package Specification</code> objects.
     * If there are no such optional packages, a zero-length array is returned.
     *
     * @param manifest Manifest to be parsed
     * @return the Package Specifications extensions in specified manifest
     * @throws ParseException if the attributes of the specifications cannot
     * be parsed according to their expected formats.
     */
    public static Specification[] getSpecifications(final Manifest manifest)
        throws ParseException {
        if (null == manifest) {
            return new Specification[ 0 ];
        }

        final ArrayList results = new ArrayList();

        final Map entries = manifest.getEntries();
        final Iterator keys = entries.keySet().iterator();
        while (keys.hasNext()) {
            final String key = (String) keys.next();
            final Attributes attributes = (Attributes) entries.get(key);
            final Specification specification
                = getSpecification(key, attributes);
            if (null != specification) {
                results.add(specification);
            }
        }

        final ArrayList trimmedResults = removeDuplicates(results);
        return (Specification[]) trimmedResults.toArray(new Specification[trimmedResults.size()]);
    }

    /**
     * The constructor to create Package Specification object.
     * Note that every component is allowed to be specified
     * but only the specificationTitle is mandatory.
     *
     * @param specificationTitle the name of specification.
     * @param specificationVersion the specification Version.
     * @param specificationVendor the specification Vendor.
     * @param implementationTitle the title of implementation.
     * @param implementationVersion the implementation Version.
     * @param implementationVendor the implementation Vendor.
     */
    public Specification(final String specificationTitle,
                          final String specificationVersion,
                          final String specificationVendor,
                          final String implementationTitle,
                          final String implementationVersion,
                          final String implementationVendor) {
        this(specificationTitle, specificationVersion, specificationVendor,
              implementationTitle, implementationVersion, implementationVendor,
              null);
    }

    /**
     * The constructor to create Package Specification object.
     * Note that every component is allowed to be specified
     * but only the specificationTitle is mandatory.
     *
     * @param specificationTitle the name of specification.
     * @param specificationVersion the specification Version.
     * @param specificationVendor the specification Vendor.
     * @param implementationTitle the title of implementation.
     * @param implementationVersion the implementation Version.
     * @param implementationVendor the implementation Vendor.
     * @param sections the sections/packages that Specification applies to.
     */
    public Specification(final String specificationTitle,
                          final String specificationVersion,
                          final String specificationVendor,
                          final String implementationTitle,
                          final String implementationVersion,
                          final String implementationVendor,
                          final String[] sections) {
        this.specificationTitle = specificationTitle;
        this.specificationVendor = specificationVendor;

        if (null != specificationVersion) {
            try {
                this.specificationVersion
                    = new DeweyDecimal(specificationVersion);
            } catch (final NumberFormatException nfe) {
                final String error = "Bad specification version format '"
                    + specificationVersion + "' in '" + specificationTitle
                    + "'. (Reason: " + nfe + ")";
                throw new IllegalArgumentException(error);
            }
        }

        this.implementationTitle = implementationTitle;
        this.implementationVendor = implementationVendor;
        this.implementationVersion = implementationVersion;

        if (null == this.specificationTitle) {
            throw new NullPointerException("specificationTitle");
        }

        String[] copy = null;
        if (null != sections) {
            copy = new String[ sections.length ];
            System.arraycopy(sections, 0, copy, 0, sections.length);
        }
        this.sections = copy;
    }

    /**
     * Get the title of the specification.
     *
     * @return the title of speciication
     */
    public String getSpecificationTitle() {
        return specificationTitle;
    }

    /**
     * Get the vendor of the specification.
     *
     * @return the vendor of the specification.
     */
    public String getSpecificationVendor() {
        return specificationVendor;
    }

    /**
     * Get the title of the specification.
     *
     * @return the title of the specification.
     */
    public String getImplementationTitle() {
        return implementationTitle;
    }

    /**
     * Get the version of the specification.
     *
     * @return the version of the specification.
     */
    public DeweyDecimal getSpecificationVersion() {
        return specificationVersion;
    }

    /**
     * Get the vendor of the extensions implementation.
     *
     * @return the vendor of the extensions implementation.