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Diffstat (limited to 'common/src/main/java/at/gv/egovernment/moa/util/MOAEntityResolver.java')
| -rw-r--r-- | common/src/main/java/at/gv/egovernment/moa/util/MOAEntityResolver.java | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/common/src/main/java/at/gv/egovernment/moa/util/MOAEntityResolver.java b/common/src/main/java/at/gv/egovernment/moa/util/MOAEntityResolver.java new file mode 100644 index 000000000..02302cb65 --- /dev/null +++ b/common/src/main/java/at/gv/egovernment/moa/util/MOAEntityResolver.java @@ -0,0 +1,118 @@ +/* +* Copyright 2003 Federal Chancellery Austria +* +* Licensed 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 at.gv.egovernment.moa.util; + +import java.io.InputStream; + +import org.apache.xerces.util.URI; +import org.apache.xerces.util.URI.MalformedURIException; +import org.xml.sax.EntityResolver; +import org.xml.sax.InputSource; + +import at.gv.egovernment.moa.logging.LogMsg; +import at.gv.egovernment.moa.logging.Logger; + +/** + * An <code>EntityResolver</code> that looks up entities stored as + * local resources. + * + * <p>The following DTDs are mapped to local resources: + * <ul> + * <li>The XMLSchema.dtd</li> + * <li>The datatypes.dtd</li> + * </ul> + * </p> + * <p>For all other resources, an attempt is made to resolve them as resources, + * either absolute or relative to <code>Constants.SCHEMA_ROOT</code>. + * + * @author Patrick Peck + * @author Sven Aigner + */ +public class MOAEntityResolver implements EntityResolver { + + /** + * Resolve an entity. + * + * The <code>systemId</code> parameter is used to perform the lookup of the + * entity as a resource, either by interpreting the <code>systemId</code> as + * an absolute resource path, or by appending the last path component of + * <code>systemId</code> to <code>Constants.SCHEMA_ROOT</code>. + * + * @param publicId The public ID of the resource. + * @param systemId The system ID of the resource. + * @return An <code>InputSource</code> from which the entity can be read, or + * <code>null</code>, if the entity could not be found. + * @see org.xml.sax.EntityResolver#resolveEntity(java.lang.String, java.lang.String) + */ + public InputSource resolveEntity(String publicId, String systemId) { + InputStream stream; + int slashPos; + + if (Logger.isDebugEnabled()) { + Logger.debug( + new LogMsg("resolveEntity: p=" + publicId + " s=" + systemId)); + } + + if (publicId != null) { + // check if we can resolve some standard dtd's + if (publicId.equalsIgnoreCase("-//W3C//DTD XMLSchema 200102//EN")) { + return new InputSource( + getClass().getResourceAsStream( + Constants.SCHEMA_ROOT + "XMLSchema.dtd")); + } else if (publicId.equalsIgnoreCase("datatypes")) { + return new InputSource( + getClass().getResourceAsStream( + Constants.SCHEMA_ROOT + "datatypes.dtd")); + } + } else if (systemId != null) { + // get the URI path + try { + URI uri = new URI(systemId); + systemId = uri.getPath(); + if (!"file".equals(uri.getScheme()) || "".equals(systemId.trim())) { + return null; + } + } catch (MalformedURIException e) { + return null; + } + + // try to get the resource from the full path + stream = getClass().getResourceAsStream(systemId); + if (stream != null) { + InputSource source = new InputSource(stream); + + source.setSystemId(systemId); + return source; + } + + // try to get the resource from the last path component + slashPos = systemId.lastIndexOf('/'); + if (slashPos >= 0 && systemId.length() > slashPos) { + systemId = systemId.substring(slashPos + 1, systemId.length()); + stream = + getClass().getResourceAsStream(Constants.SCHEMA_ROOT + systemId); + if (stream != null) { + InputSource source = new InputSource(stream); + + source.setSystemId(systemId); + return source; + } + } + } + + return null; // nothing found - let the parser handle the entity + } +}
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