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Diffstat (limited to 'libjava/javax/imageio/metadata/IIOMetadata.java')
| -rw-r--r-- | libjava/javax/imageio/metadata/IIOMetadata.java | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/libjava/javax/imageio/metadata/IIOMetadata.java b/libjava/javax/imageio/metadata/IIOMetadata.java new file mode 100644 index 00000000000..bb96770dd15 --- /dev/null +++ b/libjava/javax/imageio/metadata/IIOMetadata.java @@ -0,0 +1,213 @@ +/* IIOMetadata.java -- + Copyright (C) 2004 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA +02111-1307 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package javax.imageio.metadata; + +/** + * @author Michael Koch (konqueror@gmx.de) + */ +public abstract class IIOMetadata +{ + protected IIOMetadataController controller; + protected IIOMetadataController defaultController; + protected String[] extraMetadataFormatClassNames; + protected String[] extraMetadataFormatNames; + protected String nativeMetadataFormatClassName; + protected String nativeMetadataFormatName; + protected boolean standardFormatSupported; + + /** + * Creates a <code>IIOMetaData</code> object. + */ + protected IIOMetadata() + { + // Do nothing here. + } + + /** + * Creates a <code>IIOMetaData</code> object with the given arguments. + * + * @param standardMetadataFormatSupported + * @param nativeMetadataFormatName + * @param nativeMetadataFormatClassName + * @param extraMetadataFormatNames + * @param extraMetadataFormatClassNames + * + * @throws IllegalArgumentException if extraMetadataFormatNames has length of + * zero or extraMetadataFormatNames and extraMetadataFormatClassNames are + * neither both null, not have the same length + */ + protected IIOMetadata(boolean standardMetadataFormatSupported, + String nativeMetadataFormatName, + String nativeMetadataFormatClassName, + String[] extraMetadataFormatNames, + String[] extraMetadataFormatClassNames) + { + if (extraMetadataFormatNames != null + && extraMetadataFormatNames.length == 0) + throw new IllegalArgumentException + ("extraMetadataFormatNames may not be empty"); + + if (((extraMetadataFormatNames == null) + && (extraMetadataFormatClassNames != null)) + || ((extraMetadataFormatNames != null) + && (extraMetadataFormatClassNames == null)) + || ((extraMetadataFormatNames != null) + && (extraMetadataFormatClassNames != null) + && (extraMetadataFormatNames.length != + extraMetadataFormatClassNames.length))) + throw new IllegalArgumentException + ("extraMetadataFormatNames and extraMetadataFormatClassNames " + + "have different lengths"); + + this.standardFormatSupported = standardMetadataFormatSupported; + this.nativeMetadataFormatName = nativeMetadataFormatName; + this.nativeMetadataFormatClassName = nativeMetadataFormatClassName; + this.extraMetadataFormatNames = extraMetadataFormatNames; + this.extraMetadataFormatClassNames = extraMetadataFormatClassNames; + } + + public boolean activateController() + { + if (! hasController()) + return false; + + return getDefaultController().activate(this); + } + + public IIOMetadataController getController() + { + return controller; + } + + public IIOMetadataController getDefaultController() + { + return defaultController; + } + + public String[] getExtraMetadataFormatNames() + { + return (String[]) extraMetadataFormatNames.clone(); + } + + public IIOMetadataFormat getMetadataFormat(String formatName) + { + if (formatName == null) + throw new IllegalArgumentException("formatName may not be null"); + + String formatClassName = null; + + if (isStandardMetadataFormatSupported() + && formatName.equals(nativeMetadataFormatName)) + formatClassName = nativeMetadataFormatClassName; + else + { + String[] extraFormatNames = getExtraMetadataFormatNames(); + + for (int i = extraFormatNames.length - 1; i >= 0; --i) + if (extraFormatNames[i].equals(formatName)) + { + formatClassName = extraFormatNames[i]; + break; + } + } + + if (formatClassName == null) + throw new IllegalArgumentException("unknown format"); + + IIOMetadataFormat format; + + try + { + format = (IIOMetadataFormat) Class.forName(formatClassName) + .newInstance(); + } + catch (Exception e) + { + IllegalStateException ise = new IllegalStateException(); + ise.initCause(e); + throw ise; + } + + return format; + } + + public String[] getMetadataFormatNames() + { + String[] formatNames = getExtraMetadataFormatNames(); + + if (isStandardMetadataFormatSupported()) + { + // Combine native metadata format name and extra metadata format names + // into one String array. + String[] tmp = new String[formatNames.length + 1]; + tmp[0] = getNativeMetadataFormatName(); + + for (int i = 1; i < tmp.length; ++i) + tmp[i] = formatNames[i - 1]; + + formatNames = tmp; + } + + return formatNames; + } + + public String getNativeMetadataFormatName() + { + return nativeMetadataFormatName; + } + + public boolean hasController() + { + return getController() != null; + } + + public abstract boolean isReadOnly(); + + public boolean isStandardMetadataFormatSupported() + { + return standardFormatSupported; + } + + public abstract void reset(); + + public void setController(IIOMetadataController controller) + { + this.controller = controller; + } +} |